Lennox 2P1109 Thermostat User Manual

Table of Contents

WARNING

icomfortꢁ Thermostat Terms and Acronyms . . . . . . . . . . . . . . . . .

icomfortꢁ Technical Description . . . . . . . . . . . . . . . . . . . . . . . . . . .

icomfortꢁ Thermostat Features . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installing icomfortꢁ Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . .

Always turn off power at the main power source by switching the

circuit breaker to the OFF position before installing or removing

this thermostat.

All wiring must conform to local and national building and electri-

cal codes and ordinances.

Installer setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setting time and date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Add/remove/modify non−communicating devices . . . . . . . . .

Do not switch system to cool if the outdoor temperature is below

45°F (7°C). This can damage the cooling system.

Modify communicating device settings . . . . . . . . . . . . . . . . . . 10

Indoor air quality controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

CAUTION

This is a 24VAC low−voltage thermostat. Do not install on volt-

ages higher than 30VAC.

Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Access installer program from User Home screen . . . . . . . . . . . . 22

Reconfiguring a system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Editable parameters table (user and Installer) . . . . . . . . . . . . . . . . 25

Alarm Codes and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Do not short (jumper) across terminals on the gas valve or at the

system control to test installation. This will damage the thermo-

stat and void the warranty.

IMPORTANT

Read this manual before programming this thermostat.

Use this thermostat only as described in this manual.

Page 2

506052−01 11/09

icomfortt Thermostat Terms and Acronyms

Subnet Controller (SC): (part of the communicating thermostat) Local

device that controls the system.

tions, fan motor, and reversing valve and monitors all safety features in

the unit.

AC Control: Communicating air conditioning control. AC controls low

and high speed compressor operation, fan motor operation, and all safe-

ty monitors in the unit.

Subnet: A part of the communication network that contains devices to

control one functional HVAC system.

RSBus − Residential Serial Bus − the means for transmitting data within

the communicating system.

Discharge Air Sensor (DAS): Communicating discharge air sensor.

Provides discharge air temperature to Bus, UI, and IFC for proper opera-

tion of equipment.

Controller Area Network Protocol: Rules for networking, for transmis-

sion and receipt of information between communicating systems.

R: 24V power

Baud Rate: Maximum speed of BUS 40K baud.

C: 24V common

i+: + data information connection

i−: − data information connection

Byte: 8 bits of information transmitted on the RSBus.

IntegratedFurnace Control (IFC): Communicating control for furnace.

IFC controls ignition, CAI, blower, and monitors all safety features in the

unit.

Configuration:Function that accrues during setup of system to identify

other communicating devices. Configuration is also used in setup of a

variable capacity furnace to properly set furnace parameters.

Air Handler Control (AHC): Communicating control for air handler

units. AHC controls operation of blower, heat strips, and monitors all

safety features in the unit.

Memory Fault Recall: Method of checking for errors

Firmware:Software stored on a memory chip instead of being part of a

program

HP Control (Defrost Control) (UC): Communicating defrost control.

UC controls low and high speed compressor operation, defrost opera-

Software: Programming and applications for computer

Page 3

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

icomfortt Technical Description

The 24VAC icomfortꢁ thermostat stores system parameters and set-

tings in a nonvolatile memory (i.e., it retains data when electrical power

fails or is turned off). The thermostat (see figure 1) also:

ꢂ

includes on-board help screens,

Thermostat

connections

supports heat pumps or non−heat pump units, with up to 4 stage

heat / 2 stage compressor operation. (2 stages of heat pump heat-

ing and 2 stages of auxiliary backup heat are provided. Also, 2

stages of emergency heat are provided),

I+ I − C

ꢂ

supports Indoor Air Quality with time-based notification of consum-

ables including media filters, UVC bulbs, humidifier pads, and

PureAirꢁ catalyst service / replacement,

supports variable capacity / multistage heat/cool, universal com-

patibility(gas/electric/heat pump/ac), and is dual fuel capable with

two balance points.

Maximum total length

of all connections on

the RSBus is limited

to 1500ft.

RSBUS

Minimum wire size is

18 gauge

Important

icomfortꢁ Outdoor Units Control

icomfortꢁ Furnace Control

icomfortꢁ Air Handler Control

Always use correct software version as recommended for replacement

configuration (discovery).

External Sensors − outdoor temperature and humidity

Humidify control

Dehumidify control

Connectionsto non communication outdoor units and all accessories is

describedin the Quick−Start Installation guide. (Wiring diagrams are also

shown beginning on Page 36.)

Figure 1. icomfort thermostat system

Page 4

506052−01 11/09

icomfortt Thermostat Features

Installing icomfortt thermostat

Refer to the Quick Start Guide for all the information about installing the

thermostatto a wall and for wiring diagrams for connecting the thermo-

stat to the system using one of a number of possible configurations.

(Wiring diagrams are also shown beginning on Page 36.)

Thermostat Type

Electronic communicating, color display touch screen, 7−day program-

mable.

Supports

After all the wiring is in place, apply power to the system. 24VAC will be-

gin to power up the thermostat.

ꢂ

Humidification Measurement and Control,

Dew Point Adjustment Control,

Dehumidification Measurement and Control,

Continue with the Installer setup that follows.

Humiditrol Enhanced Dehumidification Accessory (EDA),

Multi-stage HVAC Systems,

Equipment Maintenance Reminders.

On-board Help Screens.

The icomfortꢁ thermostat’s autochangeover mode permits control of

heating, cooling, humidification, and dehumidification without user in-

volvement.

Outdoor Temperature Sensor

Communicatingoutdoor units contain a built in outdoor temperature sen-

sor.

Page 5

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Installer setup − Page 1 of 8

After power is applied to the thermostat for the first time, the processor

checks the system for installed communicating devices, the ꢀSystem

discovery" screen (figure 2) is displayed on the thermostat; followed by

the ꢀUse this thermostat" screen (figure 3). Press press here to contin-

ue.

During the setup process, alerts may pop open to inform the installer

some item of information that affects the setup (figure 4). Tend to any

such alerts prior to continuing setup.

critical alert

SYSTEM DISCOVERY IN PROGRESS

Active

Critical Alert Code: 31

AIR HANDLER reports:

Lost Communication with

THERMOSTAT −

Figure 2. System discovery

tests

setup

HELP

Latest occurrence: 8/23/09

1:57 PM

press for more

Thermostat 1

Figure 4. Alert window

Use this Thermostat?

press here

Figure 3. Use this thermostat screen

Page 6

506052−01 11/09

Installer setup − Page 2 of 8

ꢀSystem settingsꢀ (figur e 5 ) appear first. As you use the up/down arrows

to scroll through the settings, the right hand side will show the current

value, for example, Current Value: (35% ) shows the current setting of

the Circulate Fan ON time.

If you want to modify a setting, use one of the tools shown in figure 6.

(Make time and date as described on Page 8.) After changes have

been made, use save to store the changed data or cancel to exit the

screen and return to the list of settings.

setup

HELP

Daylight Saving Time

up/down arrows

scroll through a

numeric range for

some settings

To view/edit a setting,

highlight it, then press edit.

system settings

Enabled

Time and Date

Current Value:

(35%)

Daylight Saving

Time

Disabled

cancel

save

Circulate Fan ON

time

edit

Dealer Name

Dealer Address

typewriter tool to input

names, address, phone

numbers etc.

Dealer Phone

Number

next step

back

Dealer Email

Dealer Name

Figure 5. System settings

The following shows the range/condition and defaults for the settings.

Lennox Repairman

system setting

range/condition

default

use

Time and Date

see Page 8

(

)

Daylight Saving Time

Circulate Fan ON Time

Enabled/Disabled

15 to 45

Enabled

35%

−

cancel

save

Dealer Name

Lennox

Dealer Address

Dealer Phone Number

Dealer Email

ꢁ

use type

writer to

change

back

space

CAPS

(alpha−numeric

characters)

symbols

space

1−800−9−LENNOX

ꢁ

Dealer Website

www.lennox.com

Figure 6. Settings change tools

Page 7

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Installer setup − Page 3 of 8

Setting time and date

ꢂ

Press other boxes and adjust with the arrows for all time and date

information. When the date and time is correct, press save to save

settings and return to previous settings screen.

Use the arrows to select Time and Date; press edit (see figure 7). Press

next to proceed to the ꢀSet current time and date" screen (figure 8).

tests

setup

HELP

setup

HELP

to adjust a setting, highlight

it, then press edit.

Time and Date

system settings

Time and Date

Current Value:

(September 15, 2009,

09:23 AM)

Daylight Saving

Time

10 :19

Circulate Fan ON

time

adjust

Oct 15 2009

edit

Dealer Name

cancel

save

Dealer Address

Dealer Phone

Number

next step

back

Dealer Email

Figure 8. Set current time and date

Figure 7. View/edit time and date

NOTE − After setting the time and date, if you don’t need to add any non−

communicating devices, you may wish to accept the default system pa-

rameters and skip forward to ꢀtests". To do so, repeatedly press next

step on each screen until you get to the tests screen. From there, you

can check the systems operation. Thereafter, should you need to

change a communicating device parameter, access those settings by

pressing the equipment tab in the installer section.

When the ꢀTime and Date" screen appears, enter the correct date as fol-

lows:

ꢂ

Press one of the time and date boxes − the text will change to white

type in a dark box (for example, press the ꢀ10" box in figure 8).

Press the up/down arrows to change the data.

Page 8

506052−01 11/09

Installer setup − Page 4 of 8

Add/remove/modify non−communicating devices

setup

HELP

From this screen (figure 9), use the yes button to access a list of non−

communicatingdevices for installing or removing. A list similar to that

shown in figure 10 will appear.

non−communicating

device list

to adjust a setting, highlight it,

then press edit

HUMIDIFIER

Current Value:

(Not Installed)

setup

HELP

DEHUMIDIFIER

UV LIGHT

system devices

edit

XP19−060−230−06

5809K00015

Add or Remove

Non−communicating

equipment?

yes

AIR HANDLER

CBX32MV−60

5809K00020

back

THERMOSTAT

49W95

A109K00139

Figure 10. Installing UV Light

A typical Installed status screen (Figure 11) shows if the device is not

installed or type of equipment installed. Use the arrows to change and

use save to save the change. (Cancel goes pack to previous screen.)

back

next step

SYSTEM

Installed Status

Figure 9. Add/remove/modify non−communicating devices

Not Installed

Humidification / Dehumidification Control Modes depend on a hu-

midifierand/or dehumidifier being added to the system. Therefore, you

must press yes on the button near "Add or Remove Non−communicating

equipment?" Also, in order for the user’s display to show these controls,

the system controls must be set. See Page 12 for more information.

UV LIGHT

cancel

save

Use the up/down arrows (see figure 10) to select a setting. The right hand

side of the screen indicates what is currently selected, for example, Cur-

rent Value: (Not Installed); press edit if you want to modify that setting.

Figure 11. Typical non−communicating device edit screen

Page 9

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Installer setup − Page 5 of 8

Modify communicating device settings

setup

HELP

Use this screen (figure 12) to access communicating devices’ settings.

Use back to return to the previous screen or next step to go on.

to adjust a setting, highlight it,

then press edit

Equipment Name

setup

system devices

HELP

Compressor Short

Cycle Delay

Current Value:

(Off)

to adjust a device, highlight

it, then press edit

Defrost

Termination Temp

XP19−060−230−06

5809K00015

reset

edit

Compressor Shift

Delay On/Off

about

AIR HANDLER

CBX32MV−60

5809K00020

edit

back

reset ALL

next step

THERMOSTAT

49W95

A109K00139

Figure 13. Modify communicating device settings

SYSTEM

back

Settingsavailable for the devices are dependant on the components you

have. Shown below is an example of changing the compressor shift

delay on. After using the arrows to select On, press save to save the

changes and return to the previous screen.

Figure 12. Accessing communicating device settings

With one of the devices highlighted, press about, then use arrow keys to

see a list of data about the selected device. If you select reset ALL, and

then confirm, ALL devices will be reset to their factory settings. (You

would see a screen similar to figure 14.)

Compressor Shift Delay On/Off

With one of the devices in figure 12 highlighted, press edit to go to that

device’s list of settings (see figure 13).

Off

cancel

Use the up/down arrows to scroll through the device’s settings and ob-

serve the right hand side of the screen (figure 13) to see the current set-

ting, for example, Current Value: (Off). Press edit if you want to modify

that setting, or press back to return to the previous screen.

save

Page 10

506052−01 11/09

Installer setup − Page 6 of 8

If you select reset and then confirm, the highlighted device will be reset

to its factory setting. You would see a screen similar to figure 14, but ref-

erencing only the selected device.

XP19−060−230−06

5809K00015

After a reset, the device which had its settings reset to

default will display in the system devices screen in red

type. You will be required to highlight the red−type de-

vice(s) and use edit (see figure 12) to change, or at

least view the changed settings of the red−type de-

vices .

AIR HANDLER

CBX32MV−60

5809K00020

Resetting ALL devices to their factory default

settings will cause the system to restart the

setup process. If you want to continue, then

press ’confirm’ or press ’cancel’.

Equipment

Name

In the edit mode, the feature list will show the selected

device’s changed features in red type. Use the up/

down arrows to select each red−typed feature and

press edit. Make changes to the settings using the

Edit tools if desired, or at least, press save in each fea-

ture screen. Upon saving, the previous screen will

display and the type will again be black. Press back to

return the Modify communicating device settings

screen.

Electric Heating

Airflow

cancel

confirm

Low Cooling

Airflow

Low Cooling

Airflow

Figure 14. Reset device confirmation note

At this point press next step to advance to the test controls.

Page 11

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Installer setup − Page 7 of 8

Indoor air quality controls

setup

tests

equipment

HELP

(to adjust a device, highlight

it, then press edit)

An example of installing UV Light is shown in figure 10, Page 9.

system devices

XP19−060−230−06

5809K00015

To turn on humidification or dehumidification controls, in addition to

the setup described on Page 9, work from either the setup tab or the

equipment tab to get to the adjustment screen (figure 15). Use the arrows

to highlight the SYSTEM selection. Press edit.

AIR HANDLER

CBX32MV−60

5809K00020

about

edit

A long list of features are listed on the right of the next screen (see figure

16). Use the arrows to locate Humidification Control Mode and/or De-

humidificationControl Mode. Press edit.

THERMOSTAT

49W95

A109K00139

reset ALL

next step

SYSTEM

49W95

A109K00139

back

Dependingon the type of equipment installed, the lists of options may be

different than those shown in figure 17. In order for either or both of these

controls to display, the selected option must be other than ꢀDisplay

Only".

Figure 15. Accessing the SYSTEM adjustment screen

Page 12

506052−01 11/09

Installer setup − Page 8 of 8

HUMIDIFICATION modes

setup

tests

equipment

HELP

BASIC & PRECISIONꢁthese modes allow user control of RH between

15 and 45%. These conditions must be met for either mode to operate:

(to adjust a setting, highlight

it, then press edit)

SYSTEM

ꢂ

humidification mode has been enabled, and

the unit is in HEAT mode, and

humidification demand exists (24V present at H), and

BASIC mode also requires heat demand exists (Y for HP heat, or W for

gas heat [W may be energized with G de−energized]).

Equipment Name

Current Value:

(Display Only)

Filter 1 Timer

Selection

(various)

DEW POINT CONTROLꢁDew point adjustment mode will change the

humidificationsetpoint based on the outdoor temperature and a user−de-

fined dew point adjustment setting.

edit

reset

Dehumidification

Control Mode

DEHUMIDIFICATION modes

InBASIC mode, dehumidification occurs if these conditions are met and

signals are present at specific terminals:

Humidification

Control Mode

back

ꢂ

dehumidification has been enabled on installer settings, and

the unit is in COOL mode, and

dehumidification demand exists (RH above setpoint), and

cooling demand exists (Y1 energized).

Figure 16. SYSTEM adjustment screen

In PRECISION mode, dehumidification occurs if all BASIC conditions

are true, except cooling demand may or may not be present. Maximum

overcool from cooling set point is 2ºF.

Humidification Control Mode

Dehumidification Control Mode

Display Only

Basic

Display Only

Basic

HUMIDITROL or AUX. DEHUMIDIFIER mode requires:

ꢂ

outdoor sensor must be installed and setup

dehumidification has been enabled on installer settings, and

the unit is in COOL mode, (or if in AUTO, at least one thermostat cooling

call made prior to the dehumidification demand), and

Precision

Humiditrol

(or Auxiliary

Dehumidifier)

cancel

save

Dew Point Control

cancel

ꢂ

a dehumidification demand exists (RH above setpoint), and

outdoor temp. below 95°F; indoor temp. above 65°F, and

for HUMIDITROL, Humiditrol comfort adjust parameters as follows:

save

MAX adj. − Indoor temp > 2°F above heating setpoint

HEAT SETPOINT+COOL SETPOINT

MID adj. − Indoor temp >

Figure 17. Selecting Dehumidification/Humidification mode

MIN adj. − Indoor temp > 2°F below cooling setpoint

Page 13

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Tests − Page 1 of 1

The tests feature is not available until after setup has been completed

once. After you press next step in the final setup screen, the ꢀSelect

tests to run" screen (figure 18) appears.

When the tests screen opens, TEST ALL will be highlighted (but not yet

selected).If you want to run TEST ALL, press select. Note your selection

on the right side says ꢀselected test TEST ALL". Also, note there are now

two buttons along the bottom labeled remove and start. Use remove to

deselect a selected test.

If you re−select the tests tab from any other screen, a message to ꢀpress

Start button below to begin system testing" appears; press start.

If you prefer, run tests one−at−a−time using the arrows to highlight a de-

sired test and then press select.

press start button below to begin system testing

Press start to begin testing.

start

setup

tests

equipment

HELP

setup

tests

equipment

HELP

select tests to run

selected tests

TEST ALL

selected tests

TEST ALL

Blower

HP Heat − 1st

Stage

HP Heat − 1st

Stage

HP Heat − 2nd

Stage

select

HP Heat − 2nd

Stage

select

Defrost Now

Cooling − 1st

Stage

Cooling − 1st

Stage

remove

start

Cooling − 2nd

Stage

skip tests

Cooling − 2nd

Stage

alerts

diagnostics

EXIT

alerts

diagnostics

EXIT

Figure 18. Select tests to run

Figure 19. Start running tests

Page 14

506052−01 11/09

Tests − Page 1 of 1

After the tests have been started, the screen will describe which test is

running (see figure 20). After concluding that the results are the desired

results for any test, press next (if using TEST ALL) to proceed to the next

test or done (if running a single test).

After pressing done, the ꢀTesting finished" screen will appear (see figure

21). At this point, use the EXIT tab (if you are finished with all setup), or

use diagnostics tab (to analyze the system), or use equipment tab (if

you wish to make any changes to device details).

setup

tests

equipment

HELP

TEST ALL example

CURRENT TEST: Blower

The Testing Process is Finished

Check Blower Operation

cancel

single test example

CURRENT TEST: Blower

Check Blower Operation

press the ’tests’ tab to run more tests.

press the ’EXIT’ tab to start normal operation.

cancel

done

alerts

diagnostics

EXIT

Figure 20. Typical tests results screens

Figure 21. Testing finished screen

Page 15

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Equipment − Page 1 of 1

This feature allows the installer to edit details of devices in the system

without having to re−run the setup program. The following appears after

the equipment tab has been selected

setup

tests

equipment

HELP

(to adjust a setting, highlight

it, then press edit)

SYSTEM

press start button below to edit details of devices in

the system

Equipment

Name

Current Value:

(System)

Filter 1 Timer

Selection

start

Filter 2 Timer

Selection

Press start; the ꢀEquipment details edit" screen (figure 22) will open.

You may view information about or modify communicating devices as

described earlier in the setup pages, beginning on page 10.

edit

reset

UV Bulb Timer

Selection

setup

tests

equipment

HELP

Humidifier Pad

Timer Selection

back

to adjust a device, highlight

it, then press edit

system devices

Figure 23. Equipment details edit

XP19−060−230−

5809K00015

Table on Page 25 shows a list of Editable Parameters for the currently

availabledevices designed to communicate in this system. Other de-

vices and additional parameters may be added at a later date. Check the

unit installation manuals (i.e. furnace, air handler, heat pump, ac unit) for

current information and default parameters.

about

AIR HANDLER

CBX32MV−60

5809K00020

edit

reset ALL

next step

THERMOSTAT

49W95

A109K00139

back

SYSTEM

Figure 22. Equipment details edit

Page 16

506052−01 11/09

Diagnostics − Page 1 of 1

If you need to run diagnostics to analyze the system, press thediagnos-

tics tab. The ꢀSelect device to run diagnostics" screen (figure 24) will

open.

select type of device to run

diagnostics on

run diagnostics on:

XP19−060−230−

5809K00015

select device to run

diagnostics on

run diagnostics on:

AIR HANDLER

CBX32MV−60

5809K00020

XP19−060−230−

5809K00015

AIR HANDLER

CBX32MV−60

5809K00020

select

remove

start

diagnostics

Diagnostics

diagnostics

Line Voltage

220 volts

Figure 24. Select device to run diagnostics

24VAC Voltage

24 volts

Use the arrow buttons to scroll through the list of items found on the left of

the screen. Then press select. The right side of the screen shows which

item is selected (figure 25). Use start to begin the process. The screen

will show ꢀDIAGNOSTICS IN PROGRESS..." briefly, then change to

show the list of values and conditions discovered.

Y1 − Output

PSC Fan Relay

ECM Fan 1

ECM Fan 2

Y2 Solenoid

Closed

Use the arrow buttons to scroll through the information and take note of

any found to be out of operating range.

done

Pressdone when finished with the information and select another device

to diagnose or use EXIT if finished.

Figure 25. Running diagnostics

Page 17

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Alerts − Page 1 of 4

As described earlier on Page 6, alerts may pop up on the screen during

setup. To view alerts otherwise, press the alerts tab. Up to 10 alerts are

stored for recall by the technician.

The first alert will be displayed in the ꢀDevice alert" screen (figure 27), in

order of:

1. critical first (red icon),

The left side of the main alert screen shows a list of each communicating

device discovered in the system and includes model and serial number

information.The up/down arrows allow you to scroll through the list of

discovered devices. The selected device is shown in bold lettering.

2. service next (yellow icon).

If the information in the alert box exceeds the box size, press press for

more to see the remaining information.

On the right side of the alert screen, press view active alerts to list all

active alerts for either SYSTEM ALERTS (lists alerts from all communi-

cating devices) or a selected device. If there are no alerts, the display will

show ꢀThere are no new alerts that require service".

alert description

active alerts

Press view cleared alerts to list previously active alerts that were

cleared by the device or installer. Until at least one alert has been cleared

by the device or the installer, the display will show ꢀThere are no new

alerts that require service".

ALERT 1 of 5

remind later

(Service) Alert Code − (0)

(Thermostat) reports:

(Replace Filter 1)

Latest Occurrence

(04/03/09)

use the arrows to

System Devices

select a device

clear

next alert

EXIT

SYSTEM ALERTS

(08:45 PM)

(4) Occurrences

view active

alerts

XP19−060−230−06

5809K00015

back

press for more

AIR HANDLER

CBX32MV−60

5809K00020

view cleared

alerts

diagnostics

THERMOSTAT

49W95

A109K00139

Figure 27. Device alert

alerts

diagnostics

EXIT

Figure 26. System Devices alerts

Page 18

506052−01 11/09

Alerts − Page 2 of 4

Clearing alerts

alert description

set time for next reminder

Acritical alert (red icon) identifies a system or device issue that can pre-

vent the system from working properly or at all, and if allowed to run,

could cause damage to the system. The issue raised by the alert must

be addressed before clearing the alert.

disabled

ALERT 1 of 5

3 months

(Service) Alert Code − (0)

(Thermostat) reports:

(Replace Filter 1)

Latest Occurrence

(04/03/09)

6 months

select

12 months

24 months

custom time

Press clear (see figure 27) to request

press ’confirm’ to clear the

alert, or press ’cancel

clearing of a critical alert; then confirm

the request (shown to the right). The de-

vice will respond to the request indicating

whether or not the alert can be cleared at

that time. If it cannot be cleared, revisit

the alert issue and make repairs accord-

ingly.

(08:45 PM)

(4) Occurrences

set

cancel

confirm

cancel

press for more

Figure 28. Set new alert date

After selecting a time period using either method and pressing set, the

ꢀCleared alert confirmation" screen (figure 29) appears.

The edit date option is not available for a critical alert.

A service alert (yellow icon) reminds users to service filters, humidifier

pad, UV light and PureAirꢁ Air Purification system.

alert description

Press clear (see figure 27) to request

the alert was cleared and

moved to alert history.

please press ’done’ to

return to the list of

active alerts.

ALERT 1 of 5

(Service) Alert Code − (0)

(Thermostat) reports:

(Replace Filter 1)

Latest Occurrence

(04/03/09)

clearing of a service alert. If you answer

no to the ꢀwas action taken" screen

(shown to the right), the alert reappears

and is not cleared. Action must be taken,

either to perform the maintenance re-

quired, or instead of clearing, you may

edit the time to again be reminded (de-

scribed later).

was action taken?

yes

(08:45 PM)

(4) Occurrences

done

press for more

If you press yes to ’was action taken?’, the ꢀSet new alert date" screen

(figure 28) appears. You may chose from the list of options or set a cus-

tom time (see figure 30).

Figure 29. Cleared alert confirmation

Press done to return to the device alert screen (figure 27, page 18).

Page 19

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Alerts − Page 3 of 4

Using ꢀcustom time"

set time for next reminder

alert description

ALERT 1 of 5

(Service) Alert Code − (0)

(Thermostat) reports:

(Replace Filter 1)

Latest Occurrence

(04/03/09)

Use ꢀSetting custom time" screen (figure 30) to set an exact date and

time for the reminder to appear. Press in one of the boxes to highlight it

and use the up/down arrows to change the value in that box. Repeat for

all boxes. When desired reminder is displayed, press set.

1 day

1 week

1 month

select

3 months

custom time

(08:45 PM)

(4) Occurrences

alert description

set time for next reminder

set

cancel

press for more

ALERT 1 of 5

(Service) Alert Code − (0)

(Thermostat) reports:

(Replace Filter 1)

Latest Occurrence

(04/03/09)

19 2009

Figure 31. Remind later options

After selecting a reminder time using the listed options or a custom time,

press set; the ꢀRemind later confirmation" screen appears (see figure

32).

set

(08:45 PM)

(4) Occurrences

alert description

cancel

press for more

remind later

ALERT 1 of 5

(Service) Alert Code − (0)

(Thermostat) reports:

(Replace Filter 1)

Latest Occurrence

(04/03/09)

set for:

Figure 30. Setting custom time

Using ꢀremind later"

1/19/10 9:49AM

done

(08:45 PM)

(4) Occurrences

You may chose remind later and select from ꢀRemind later options" list

(see figure 31) or set a custom time as described earlier (see figure 30).

Figure 32. Remind later confirmation

Press done to return to the device alert screen (figure 27, page 18).

Page 20

506052−01 11/09

Alerts − Page 4 of 4

View cleared alerts

A history of cleared alerts allows the installer to review the cleared alerts.

This information can help diagnose problems. Use the arrows to (figure

34) select either SYSTEM ALERTS or a devicefrom the list (see figure

34) and press view cleared alerts. Then scroll through the alerts using

next alert (see figure 34). The back button returns to the system devices

alerts screen.

If no alert or only one alert is present in the history of cleared alerts, only

the back button appears. If no alerts are present in the system or de-

vice’s history, a message will state that ꢀThere are no new alerts that re-

quire service".

alert description

history

use the arrows to

System Devices

select a device

SYSTEM ALERTS

ALERT 1 of 5

view active

(Service) Alert Code − (0)

(Thermostat) reports:

(Replace Filter 1)

Latest Occurrence

(04/03/09)

XP19−060−230−06

5809K00015

alerts

AIR HANDLER

CBX32MV−60

5809K00020

(08:45 PM)

(4) Occurrences

view cleared

alerts

THERMOSTAT

49W95

A109K00139

next alert

EXIT

back

alerts

diagnostics

alerts

diagnostics

EXIT

Figure 33. System Devices alerts

Figure 34. History display

Page 21

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Access installer program from Home screen − Page 1 of 1

To access the installer program after the unit has been placed in opera-

tion and the user home screen is displayed, press the ꢀLennox" logo and

hold for 5 seconds (see figure 35). The system will access the installer

screens.

Figure 36, ꢀQualified Lennox equipment installer warning" screen ap-

pears; press yes to proceed (no returns the home screen).

WARNING

The following screens are intended for use by

qualified Lennox equipment installers only.

Do you want to proceed?

yes

Figure 36. Qualified Lennox equipment installer warning

When you press yes, the thermostat’s processor will search for commu-

nicating devices in the system. The next display will be a summary of all

alerts detected.

After initial installation, if an alert is present when you are making

changes to settings, no action on the alert is mandatory.

Figure 35. Enter installation setup mode from home screen

Page 22

506052−01 11/09

Reconfiguring a system − Page 1 of 2

To begin reconfiguring a system, press the setup tab.

Press confirm to continue system configuration; the screen will change

to the system discovery screen.

The ꢀStart system configuration" screen (figure 37) appears; press start

to proceed.

setup

tests

equipment

HELP

tests

equipment

setup

tests

HELP

configuring the system may affect some device settings.

confirm to continue, or press cancel

press start button below only if you wish to setup a

new system, or to re−setup an existing system

confirm

cancel

start

back

Figure 38. Re−configure confirmation

Figure 37. Start system configuration

If this is the first attempt to configure a system, the screen will change to

the system discovery screen.

SYSTEM DISCOVERY IN PROGRESS

The ꢀRe−configure confirmation" screen (figure 38) will only appear on

attempts to RE−CONFIGURE the system. It is a reminder that system

configuration may affect some existing device settings and prompts to

confirm or cancel the configuration process (returns to figure 37).

Figure 39. System discovery

Page 23

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Reconfiguring a system − Page 2 of 2

Whilereconfiguring, the thermostat will have retained settings from the

previous configuration. If a device has been replaced and re−configura-

tion has detected its replacement device, it will know the original device

is missing and prompt the installer (figure 40).

Figure41 lists all communicating devices found and gives you an oppor-

tunity to review the reconfigured devices. Use the arrow buttons to scroll

through the list of items found on the left of the screen. Press about to

highlightan option on the right side of the screen and view details about

that device. If necessary, change SYSTEM settings as described on

Page 10.

If this is the initial configuration, the ꢀCompatible device found" screen

does not appear.

setup

HELP

setup

system devices

HELP

view/ edit selected device’s

settings

Missing

(DEVICE ETN)

Found Compatible

(DEVICE ETN)

XP19−060−230−

5809c00015

Model No.(control model no.)

Serial No. (control serial no.)

Model No.(control model no.)

Serial No. (control serial no.)

about

AIR HANDLER

CBX32MV−60

5809B00020

edit

reset all

Settings were not copied

THERMOSTAT

49W95

A109B00139

next step

back

SYSTEM

Figure 40. Compatible device found

Press next to accept the device and write the thermostat’s settings from

the previous configuration to the found compatible device. The display

changes to ꢀSettings were copied". Press next to advance to the next

screen.

Figure 41. System devices screen

Press next step to continue to test the system (see Page 14).

Page 24

506052−01 11/09

Editable Parameters Table (User and Installer)

Parameter Name:

Default

Parameter Value Setting

Increment

Installer settings

Time and Date

ꢁ

(Time/date elements screen)

ꢁ

Daylight Saving Time

Enabled

Enabled, Disabled

Circulate Fan − Percentage of Time ON

Dealer Contact Information – Name

Dealer Contact Information – Address

Dealer Contact Information – Phone

Dealer Contact Information – Email

Dealer Contact Information – Website

SYSTEM

35%

15 to 45%

Lennox

(Typewriter input screen)

ꢁ

1−800−9−LENNOX

ꢁ

www.lennox.com

Equipment Name

ꢁ

(Typewriter input screen)

Calendar Time, Run Time

Enabled, Disabled

Standard, Even Heat

Staged, Modulating

3 to 9ºF

ꢁ

Filter 1 Timer Selection

Calendar Time

Disabled

Filter 2 Timer Selection

ꢁ

Humidifier Pad Timer Selection

UV Bulb Timer Selection

PureAir Timer Selection

ꢁ

Smooth Setback Recovery

Electric Heat Control Mode

Gas Heat Control Mode

ꢁ

Standard

ꢁ

Modulating

5ºF

ꢁ

Autochangeover Temp Deadband

Max Heat Setpoint

1ºF

ꢁ

90ºF

40 to 90ºF

Min Cool Setpoint

60ºF

60 to 99ºF

Heat/Cool Stages Locked In

Disabled

Enabled, Disabled

table continued on next page

Page 25

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Parameter Name:

Default

Parameter Value Setting

Increment

1st Stage Differential

0.5ºF

1.5ºF

0.5 to 3ºF

.5ºF

ꢁ

2nd Stage Differential

0.5 to 8ºF

3rd Stage Differential

2.0ºF

4th Stage Differential

2.5ºF

0.5 to 8ºF

5th Stage Differential

3.0ºF

0.5 to 8ºF

6th Stage Differential

3.5ºF

0.5 to 8ºF

Stage Delay Timers

Enabled

20 Minutes

Off

Enabled, Disabled

5 to 120 Minutes

Off, 40F (4C), 45F (7C), 50F (10C), 55F (13C),

Enabled, Disabled

50 to 60ºF

2nd Stage Delay

5 Min

ꢁ

3rd Stage Delay

4th Stage Delay

5thStage Delay

6th Stage Delay

Locked in 2nd Stage HP by Outdoor Temp

Balance Point Control

Defrost Target Discharge Temp

Dehumidification Control Mode

Humidification Control Mode

Autochangeover Humidification Deadband

Max Humidification Setpoint

Max Dehumidification Setpoint

OK/Humid Boundary

Disabled

55ºF

ꢁ

1ºF

Display Only

Display Only, Basic, Precision

Display Only, Basic, Precision, Dew Point Control

5 to 10%

ꢁ

1ºF

45%

15 to 45%

1ºF

40%

40 to 60%

1ºF

50%

45 to 60%

1ºF

table continued on next page

Page 26

506052−01 11/09

Parameter Name:

Default

Parameter Value Setting

(Typewriter input screen)

Increment

AIR HANDLER

Equipment Name

Air Handler

ꢁ

Electric Heating Airflow

Low Cooling Airflow

High Cooling Airflow

5CFM

nnnn CFM

SEE NOTE −.

NOTE: CFM Default and Values Settings are dependent on the tonnage of the unit

1: No Delays,

2: ON: No delays; OFF: 45 sec delay

3: ON: 82%/7.5min; OFF: No delays

4: ON: 50%/30s,82%/7.5min; OFF:50%/30s

Cooling Airflow Profile

ꢁ

Low Heating Airflow

5CFM

10CFM

High Heating Airflow

nnnn CFM

SEE NOTE −.

NOTE: CFM Default and Values Settings are dependent on the tonnage of the unit

Continuous Indoor Blower Airflow

Humidification Airflow

Dehumidification Airflow

Heating Indoor Blower OFF Delay

Heating Indoor Blower ON Delay

Cooling Indoor Blower OFF Delay

Cooling Indoor Blower ON Delay

HP Indoor Blower OFF Delay

HP Indoor Blower ON Delay

THERMOSTAT

70%

10 sec

0 sec

2 sec

45 sec

0 sec

60 to 80% (percentage of reduction of High Cooling Airflow)

0 to 10 Seconds

0 to 5 Seconds

0 to 30 Seconds

0 to 10 Seconds

0 to 60 Seconds

0 to 30 Seconds

1 sec

2 sec

1 sec

5 sec

Equipment Name

ꢁ

(Typewriter input screen)

−5ºF to 5ºF

ꢁ

1ºF

Temp Reading Calibration

Humidity Reading Calibration

0ºF

−10 to 10%

1%RH

OUTDOOR EQUIPMENT

Equipment Name (HP and AC)

Outdoor Unit

300 Seconds

(Typewriter input screen = up to 35 characters in string)

ꢁ

60 Sec

ꢁ

Compressor Short Cycle Delay (HP and AC)

Compressor Shift Delay On/Off (HP only)

Defrost Termination Temp (HP only)

60 to 300 Seconds

On, Off

50ºF

50 to 100ºF

10ºF

Page 27

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Value

Min.

Default

Max.

Incr.

Parameter Name

FURNACE

Dependency

Note

Heating indoor blower OFF delay

Heating indoor blower ON delay

Cooling indoor blower OFF delay

Cooling indoor Blower ON Delay

Heat pump indoor blower OFF delay

Heat pump indoor blower ON delay

DIP SW

180

None

DIP switch setting in Non−comm.

45 sec fixed in Non−Comm. IFC

Not used on Non Com. IFC

2 sec fixed in Non−Comm. IFC

Not used on Non Com. IFC

Outdoor Unit present

Heat Pump present

Gas Heat Airflow Setting

Heating Airflow Control Type

0 – Fixed CFM

DIP SW

DATS installed

0 – Text ID 0x000E (Fixed CFM)

1 – Text ID 0x000F (Fixed DAT)

Low Heating Airflow (CFM @ 40% heat)

325

500

425

625

750

800

925

1025

1350

1500

110

120

130

120

125

450

675

Heating Airflow Control Type = 0

70,000 BTU; 1/2 HP fan

90,000 BTU; 1/2 HP fan

90,000 BTU; 1HP fan

110,000 BTU; 1 HP fan

135,000 BTU; 1HP fan

70,000 BTU; 1/2 HP fan

90,000 BTU; 1/2 HP fan

90,000 BTU; 1HP fan

110,000 BTU; 1 HP fan

135,000 BTU; 1HP fan

70,000 BTU; 1/2 HP fan

90,000 BTU; 1/2 HP fan

90,000 BTU; 1HP fan

110,000 BTU; 1 HP fan

135,000 BTU; 1HP fan

70,000 BTU; 1/2 HP fan

90,000 BTU; 1/2 HP fan

90,000 BTU; 1HP fan

110,000 BTU; 1 HP fan

135,000 BTU; 1HP fan

625

875

1025

1100

1250

1425

1850

2050

140

High Heating Airflow (CFM @ 100%

heat)

DIP SW

DIP SW*

Heating Airflow Control Type = 0

Heating Airflow Control Type = 1

Low Heating Discharge Air Temperature

(DAT @ 40% heat)

140

High Heating Discharge Air Tempera-

ture (DAT @ 100% heat)

150

160

150

155

* − Default DAT value is rounded to the closest number on 5 deg F resolution and limited by Minimum and Maximum value.

table continued on next page

Page 28

506052−01 11/09

Value

Min.

Default

Max.

Incr.

Parameter Name

Dependency

Note

Cooling Airflow Setting

High Cooling Airflow

(CFM @ 100% cool)

OU tons (OUNC) *

400CFM

Min CFM

Max CFM

Outdoor Unit present

1/2 HP blower

1 HP blower

1/2 HP blower

1 HP blower

Low Cooling Airflow

(CFM @ lowest cool stage)

See Note1 below

2+ stage Outdoor Unit present

Outdoor Unit present

Airflow Profile − Cooling

DIP SW

0–Text ID 0x0105

(A:ON:50%/30s,82%/7.5min

OFF:50%/30s)

1–Text ID 0x0106 (B:ON:82%/7.5min;

OFF: No delays)

2–Text ID 0x0107 (C:ON: No delays;

OFF: 45sec delay)

3–Text ID 0x0108 (D:No delays)

Heat Pump Airflow Setting

High Heat Pump Airflow (CFM @

100%)

OU tons (OUNC) *

400CFM

Min CFM

Max CFM

Heat Pump present

1/2 HP blower

1 HP blower

1/2 HP blower

1 HP blower

Low Heat Pump Airflow (CFM @ lowest

stage)

See Note 2 below

2+ stage Heat Pump present

Other Parameters

Equipment Name

Furnace

N/A

None

Up to 35 characters

1/2 HP blower

Continuous Indoor Blower Airflow

DIP SW (See

Note 3)

Min CFM

Max CFM

1 HP blower

Humidification Airflow

Same as above

Humidifier present

1/2 HP blower

1 HP blower

Dehumidification Airflow Percentage

140

(=70%)

120

(=60%)

160

(=80%)

(=1%)

OU present AND SC algorithm support

Percent of High Cooling Airflow

Note 1: Minimum Outdoor Unit Cooling Stage as a percentage of High Cooling Airflow (value is rounded up to the closest number on 25 CFM resolution

Note 2: Minimum Outdoor Unit Heating Stage as a percentage of High Heat Pump Airflow (value is rounded up to the closest number on 25 CFM resolution).

Note 3: All communicating Installer Parameters default CFM values based on DIP switch setting (non−communicating value) are calculated using the CFM conversion tables and

rounded up to closest number on 25 CFM resolution.

Note 4: Parameter dependency − Certain parameters are dependent on others and may not be shown on the display.

Note 5: Default Values − Jumper/DIP switches impact the default value of some parameters.

Page 29

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Parameter Name:

Default

Parameter Value Setting

Increment

User settings

Time and Date

ꢁ

Enabled

35%

(Time/date elements screen)

ꢁ

Daylight Saving Time

Circulate Fan − Percentage of Time ON

Dealer Contact Information – Name

Dealer Contact Information – Address

Dealer Contact Information – Phone

Dealer Contact Information – Email

Dealer Contact Information – Website

Language Displayed

Enabled, Disabled

15 to 45%

ꢁ

Lennox

(Typewriter input screen)

ꢁ

(Typewriter input screen)

ꢁ

1−800−9−LENNOX

ꢁ

(Typewriter input screen)

ꢁ

(Typewriter input screen)

ꢁ

www.lennox.com

English

(Typewriter input screen)

ꢁ

English

ꢁ

Temperature Display Scale

Clock Format

(F)

(F) Fahrenheit, (C) Celsius

ꢁ

12H

12 Hour, 24 Hour

ꢁ

Screen Lock−out

Unlocked

Always On

100%

Unlocked, Partially Locked, Fully Locked

Power Save, Always On

ꢁ

Backlight Setting

ꢁ

Backlight Intensity

20 to 100%

20%

ꢁ

Outdoor Temp Display

Indoor Humidity Display

Filter 1 Timer

Disabled

Enabled

Disabled

Disabled, Enabled

ꢁ

Disabled, 3 Months, 6 Months, 12 Months, 24 Months, Custom Time

Filter 1 Timer

Humidifier Pad Timer

UV Bulb Timer

Maintenance Timer

PureAir Timer

Page 30

506052−01 11/09

Alarm Codes and Troubleshooting

Alarm ID

Message Name

Action required to Clear/Recover

Unknown Device Detected − DEVICE2

Reconfigure the system. Press and hold Lennox Logo, press setup tab, press start, and press confirm. If still

persists, then check all DEVICE connections to make sure they are icomfort compatible.

Missing DEVICE2

Check all connections and cycle system power. If problem persists, then reconfigure the system (procedure

mentioned above).

Incomplete System

Thermostat did not find an Indoor Unit. Check connections and cycle power. Replace board if no response.

Too Many Devices of the Same Type

Thermostat found more than one outdoor unit, or more than 1 indoor unit, or more than 1 thermostat connected

to the system. Check wiring and remove duplicate equipment.

Low Ambient HP Heat Lockout

Notification only − Outdoor Temp is below the Low Balance Point. HP will not be used to service a Heating Call.

High Ambient Auxiliary Heat Lockout

Notification only − Outdoor Temp is above the High Balance Point. Indoor Unit (Furnace or Electric Heat) will not

be used to service a Heating Call.

Over Temperature Protection

Indoor Temp went above 99ºF during a heating or cooling call. Heating is not allowed. Check that Thermostat

Sensor is accurate. Check that Heating Equipment is not stuck ON (reversing value, etc.). Select system mode

to cooling to try and cool the indoor space.

Low Temperature Protection

Indoor Temp went below 40ºF. Cooling is not allowed. Check that cooling equipment is not stuck ON. Check

accuracy of the thermostat temperature. Try to heat the space to above 40ºF.

Lost Communication with DEVICE2

Asynchronous Reset DEVICE2

DEVICE2 is not communicating to the thermostat for more than 3 minutes. Check connections if fault persists,

then cycle power.

DEVICE2 is resetting by itself. Check power connections, and check 24VAC voltage at DEVICE. The alarm is

only cleared by pressing the clear button on the Installer Alerts Tab. If fault persists after checking connections,

replace board.

Must Program Unit Capacity for DEVICE2

DEVICE2 is missing the programmed unit capacity. Go to DEVICE2 and program unit capacity manually. See

unit IOM for instructions.

Incorrect Operation of DEVICE2

Communication Problem

DEVICE2 did not follow the command of the thermostat. Check connections and cycle power.

105

Equipment is unable to communicate. Check for miswired and/or loose connections and check for a high volt-

age source of noise close to the system (welder etc.).

110

113

114

115

116

120

124

Low AC Line Voltage

Line Voltage Low (Voltage lower than nameplate rating). Check voltage.

Line Voltage High (Voltage higher than nameplate rating). Check voltage.

No 60 Hertz Power (Check voltage and frequency).

High AC Line Voltage

AC Line Frequency/Distortion Problem

Low Secondary (24VAC) Voltage

High Secondary (24VAC) Voltage

Unresponsive DEVICE2

24 Voltage Low (Range is 18 and 30 volts ). Check voltage.

24 Voltage High (Range is 18 and 30 volts ). Check voltage.

Usually caused by delay in outdoor unit responding to indoor unit poling recycle power, check wiring.

Equipment lost communication with the thermostat. Check connections and cycle power on the thermostat.

Active Subnet Controller Missing

table continued on next page

Page 31

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Alarm Codes and Troubleshooting

Alarm ID

Message Name

Action required to Clear/Recover

125

Control Hardware Problem

Hardware problem on the control board. Cycle power on control. Replace if problem prevents service and is

persistent.

126

Control Internal Communication Problem

Hardware problem on the control board. Cycle power on control. Replace if problem prevents service and is

persistent.

130

131

132

Configuration Jumper Missing

Corrupted Control Parameters

Configuration jumper(s) missing on control board (applicable in non−communication only).

Reconfigure the system. Replace board if service (heating cooling) is not viable.

Failed Flash CRC Check (Check Sum) Software

is corrupted.

Recycle power, if re−occurs replace control.

180

Outdoor Temperature Sensor Problem

Compare outdoor sensor resistance to temperature/resistance charts in installation instructions. Replace if

necessary.

200

201

202

Rollout Limit Switch Open

Correct unit cause of rollout trip or replace flame rollout switch and test furnace operation.

Indoor blower communication failure including power outage. Check wiring to motor.

Indoor Blower Motor Problem

ID Blower Motor & Unit Size Mismatch

Incorrect appliance capacity code selected. Check for proper configuring under: Unit Size Codes for Furnace/Air

Handler on configuration guide or in installation instructions.

203

Invalid Unit Code

No appliance capacity code selected. Check for proper configuring under: Unit Size Codes for Furnace/Air

Handler on configuration guide or in installation instructions.

204

205

207

Gas Valve Problem

Check operation and wiring of gas valve.

Gas Valve Relay Contact Closed

HSI Sensed Open

Check wiring to relay; if wiring is correct, replace relay.

Measure resistance of Hot Surface Ignition ignitor. Replace if open or not within specification range found in

IOM.

223

224

225

226

227

Low Pressure Switch Open

Check inches of water column closing pressure of low pressure switch on heat call, measure inches of water

column of operating pressure, inspect vent and combustion air inducer for correct operation and restriction.

Low Pressure Switch Stuck Closed

High Pressure Switch Failed to Close

High Pressure Switch Stuck Closed

Low Pressure Switch Open in Run Mode

Check operation of low pressure switch for stuck closed on heat call, measure inches of water column of oper-

ating pressure, inspect vent and combustion air inducer for correct operation and restriction.

Check inches of water column closing pressure of high pressure switch on heat call, measure inches of water

column of operating pressure, inspect vent and combustion air inducer for correct operation and restriction.

Check operation of high pressure switch for closing on heat call, measure inches of water column of operating

pressure, inspect vent and combustion air inducer for correct operation and restriction.

Check inches of water column closing pressure of low pressure switch on heat call, measure inches of water

column of operating pressure, inspect vent and combustion air inducer for correct operation and restriction.

228

240

Inducer/Pressure Switch Calibration Failure

Low Flame Current − Run Mode

Unable to perform pressure switch calibration. Check vent system and pressure switch wiring connections.

Check micro amperes of flame sensor in board diagnostics or field installed mode; clean or replace sensor.

Measure voltage of neutral to ground for good unit ground.

table continued on next page

Page 32

506052−01 11/09

Alarm Codes and Troubleshooting

Alarm ID

Message Name

Action required to Clear/Recover

241

250

252

270

271

Flame Out of Sequence − Still Present

Primary Limit Switch Open

Shut off gas, check for gas valve leak.

Check firing rate on furnace, blockage in heater, and air flow.

Check temperature rise, air flow and input rate.

Discharge Air Temperature High

Watch Guard − Flame Failure on Ignite

Watch Guard − Low Pressure Switch Open

Check for gas flow, ignitor lighting burner, flame sensor current.

Check inches of water column closing pressure of low pressure switch on heat call, measure inches of water

column of operating pressure, inspect vent and combustion air inducer for correct operation and restriction.

272

Watch Guard − Low Pressure Switch Open Run

Mode

Check operation of low pressure switch for stuck closed on heat call, measure inches of water column of oper-

ating pressure, inspect vent and combustion air inducer for correct operation and restriction. Check inches of

water column closing pressure of high pressure switch on heat call, measure inches of water column of operat-

ing pressure, inspect vent and combustion air inducer for correct operation and restriction.

273

Watch Guard − Flame Fail in Run Mode

Watch Guard − Primary Limit Switch Open

Check micro amperes of flame sensor in board diagnostics or field installed mode; clean or replace sensor.

Measure voltage of neutral to ground for good unit ground.

274

275

Check why limit is tripping, over fired, low air flow.

Shut off gas, check for gas valve leak.

Watch Guard − Flame Out of Sequence. No

Flame

276

290

Watch Guard − Calibration Failure

Ignition Circuit Problem

Unable to perform pressure switch calibration. Check vent system and pressure switch wiring connections.

Measure resistance of Hot Surface Ignition ignitor, replace if open or not within specification; otherwise replace

control.

291

292

Heat Airflow Restricted Below Min.

Indoor Blower Motor Start Problem

Check for dirty filter, unit air flow restriction, blower performance.

Indoor blower motor unable to start (seized bearing, stuck wheel, etc.). Replace motor or wheel if assembly

does not operate or meet performance.

294

295

Inducer Motor Over current

Check combustion blower bearings, wiring, amps. Replace if does not operate or meets performance.

Indoor Blower Over Temperature

Indoor blower motor over temperature (motor tripped on internal protector). Check motor bearings, amps; re-

place if necessary.

310

311

312

Discharge Air Sensor Problem

Compare outdoor sensor resistance to temperature/resistance charts in installation instructions. Replace sensor

if necessary.

Heat Rate Reduced to Match Airflow

Reduced Airflow − Indoor Blower Cutback

Furnace blower in cutback mode due to restricted airflow. Check filter and ductwork. To clear, replace filter if

needed or repair/add ductwork.

Restricted airflow − Indoor blower is running at a reduced CFM (Cutback Mode − The variable speed motor has

pre−set speed and torque limiters to protect the motor from damage caused by operating out of its designed

parameters (0 to 0.8" w.g. total external static pressure). Check filter and ductwork. To clear, replace filter if

needed or repair/add ductwork.

table continued on next page

Page 33

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Alarm Codes and Troubleshooting

Alarm ID

Message Name

Action required to Clear/Recover

313

Indoor/Outdoor Unit Capacity Mismatch

Incorrect indoor/outdoor capacity code selected. Check for proper configuring in installation instructions. Alarm

is just a warning. The system will operate, but might not meet efficiency and capacity parameters and alarm

would clear when commissioning is exited.

345

346

Relay O Failure

O relay / Stage 1 failed (Pilot relay contacts did not close or the relay coil did not energize),

HP Jumper not Removed

Configuration jumper(s) not removed on control board cut O−R. Applicable with non communicating outdoor unit

with communicating indoor system.

347

348

349

350

Relay Y1 Failure

Y1 relay / Stage 1 failed (Pilot relay contacts did not close or the relay coil did not energize),

Y2 relay / Stage 2 failed (Pilot relay contacts did not close or the relay coil did not energize),

Configuration link R to O needs to restored Applicable in non communicating mode,

Relay Y2 Failure

IFC Error Check Jumper O to R

Electric Heat not Configured

Heat call with no configured or mis−configured electric heat. Check for proper configuring under Configuring

Electric Heat Stages in the air handler installation instructions.

351

Electric Heat Stage 1 Problem

Heat section / Stage 1 failed (Pilot relay contacts did not close or the relay coil in the electric heat section did

not energize).

352

353

354

355

400

Electric Heat Stage 2 Problem

Electric Heat Stage 3 Problem

Electric Heat Stage 4 Problem

Electric Heat Stage 5 Problem

LSOM Compressor Internal Overload Tripped

Heat section / Stage 2 failed (Same as Code 351).

Heat section / Stage 3 failed (Same as Code 351).

Heat section / Stage 4 failed (Same as Code 351).

Heat section / Stage 5 failed (Same as Code 351).

Compressor protector is open. Check for high head pressure, check compressor supply voltage.

Outdoor unit power disconnect is open.

Compressor circuit breaker or fuse(s) is open.

Broken wire or connector is not making contact.

Low or high pressure switch open if present in the system.

Compressor contactor has failed to close.

401

402

403

404

405

406

407

408

409

LSOM Compressor Long Run Cycle

LSOM Outdoor Unit System Pressure Trip

LSOM Compressor Short−Cycling

LSOM Compressor Rotor Locked

LSOM Compressor Open Circuit

Compressor ran over 18 hours on one room thermostat demand.

Outdoor unit pressure trip. Check dirty coil, fan motor, refrigerant charge.

Compressor short cycling (Running less than 4 minutes).

Check capacitor, wiring, hard−start kit, replace compressor.

Check compressor for hot (cool down), check pressures, fan motor etc. Replace compressor if unable to get

circuit to close and compressor to operate.

LSOM Compressor Open Start Circuit

LSOM Compressor Open Run Circuit

LSOM Compressor Contactor Welded

LSOM Compressor Voltage Low

Replace contactor.

Check power to unit.

table continued on next page

Page 34

506052−01 11/09

Alarm Codes and Troubleshooting

Alarm ID

Message Name

Action required to Clear/Recover

410

411

Open Low Pressure Switch

Remove any blockages or restrictions from indoor coils and/or fans. Check refrigerant charge and system operation.

Low Pressure Switch Strikes Lockout

Check system charge using approach and sub cooling temperatures. Reset by putting outdoor board in test

mode or resetting low voltage power.

412

413

Open High Pressure Switch

Check system operating pressures and compare to unit charging charts.

High Pressure Switch Strikes Lockout

Check system charge using approach and sub cooling temperatures. Reset by putting outdoor board in test

mode or resetting low voltage power.

414

415

High Discharge Line Temperature

Check system operating pressures and compare to unit charging charts.

High Discharge Line Temperature Strikes Lock-

out

Check system charge using approach and sub cooling temperatures. Reset by putting outdoor board in test

mode or resetting low voltage power.

416

417

Outdoor Coil Sensor Faulty

Sensor being detected open or shorted or out of temperature range. Board will not perform demand or time/tem-

perature defrost operation. (System will still heat or cool).

Discharge Sensor Faulty

The board detects open sensor or out of temperature sensor range. This fault is detected by allowing the unit to

run for 90 seconds before checking sensor resistance. If the sensor resistances not within range after 90 sec-

onds, the board will count one fault. After 5 faults, the board will lockout.

418

419

420

421

530

531

532

594

700

701

702

703

704

705

W Output Hardware Fault

Replace the control board.

W Output Hardware Fault Lockout

Defrost Out of Control

Defrost longer than 20 minutes. Check HP operation.

Check and correct the wiring.

W External Miswire Alarm

Damper End Switch Failed to Close

Damper End Switch Failed to Open

Damper Control Module Alarm

Repair/replace damper.

Check/replace if needed.

Discharge Air Temperature Sensor Problem

Comfort Sensor Temperature Sensor Problem

Comfort Sensor Temperature Too High

Comfort Sensor Temperature Too Low

Comfort Sensor Humidity Sensor Problem

Comfort Sensor Humidity Too High

Comfort Sensor Humidity Too Low

Check wiring. Ohm out sensor and check to temperature/resistance chart.

Recalibrate stat to clear, replace thermostat if needed.

Recalibrate stat to clear, cool down stat, adjust setpoint, replace thermostat if needed.

Recalibrate stat to clear, warm up stat, adjust setpoint, replace thermostat if needed.

Recalibrate stat to clear, adjust setpoint, replace thermostat if needed.

Recalibrate stat to clear, replace thermostat if needed.

Recalibrate stat to clear replace thermostat if needed.

Page 35

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Wiring Diagrams − Communicating Systems

icomfortꢁ

FURNACE (IFC) OR AIR HANDLER (AHC)

OPTIONAL DIS-

CHARGE AIR SEN-

SOR (SEE DAS

NOTE)

DAS NOTE − The discharge air sensor

is intended to be mounted downstream

of the heat exchanger and air condi-

tioning coil. It must be placed in free

airflow, where other accessories (such

as humidifiers, UV lights, etc.) will not

interfere with its accuracy. Wiring dis-

tance between the IFC or AHC and the

discharge air sensor should not exceed

10ft when wired with 18−gauge thermo-

stat wire.

OPTIONAL OUT-

DOOR AIR SENSOR

(SEE OAS NOTE)

icomfortꢁ

THERMOSTAT

OAS NOTE − Wiring distance between

the IFC or AHC and the outdoor tem-

perature sensor should not exceed

200ft when wired with 18−gauge ther-

mostat wire.

icomfortꢁ

OUTDOOR AIR

CONDITIONING OR

HEAT PUMP UNIT

RSBus

icomfort

ꢁ

Thermostat

Maximum total length of all connections

on the RSBus is limited to 1500ft.

ꢁ

Indoor Furnace or Air Handler

Outdoor Condensing Unit or Heat Pump

ꢁ

Wire gauge of RSBus wire is 18.

Page 36

506052−01 11/09

Wiring Diagrams − Communicating Indoor/non−Communicating Outdoor Systems

icomfortꢁ AIR HANDLER (AHC)

icomfortꢁ FURNACE (IFC) OR AIR HANDLER (AHC)

OPTIONAL DIS-

CHARGE AIR SEN-

SOR (SEE DAS

NOTE Page 36)

OPTIONAL OUT-

DOOR AIR SENSOR

(SEE OAS NOTE

Page 36)

CHARGE AIR SEN-

SOR (SEE DAS

NOTE Page 36)

OPTIONAL OUT-

DOOR AIR SENSOR

(SEE OAS NOTE

Page 36)

icomfortꢁ

THERMOSTAT

icomfortꢁ

THERMOSTAT

RSBus

Maximum total

length of all connec-

tions on the RSBus

is limited to 1500ft.

Maximum total

length of all connec-

tions on the RSBus

is limited to 1500ft.

STANDARD

OUTDOOR AIR

CONDITIONING

UNIT − 1 OR 2

STAGE

STANDARD

OUTDOOR HEAT

PUMP UNIT − 1

OR 2 STAGE

Wire gauge of

RSBus wire is 18.

Wire gauge of

RSBus wire is 18.

icomfortꢁ Thermostat

icomfortꢁ Indoor Furnace or Air Handler

Standard Outdoor Condensing Unit

icomfortꢁ Air Handler

Standard Outdoor Heat Pump

Page 37

icomfortꢁ Touch Screen 7−Day Programmable Thermostat

Optional Accessories for use with any icomfortt system

NOTE: icomfortꢁ T’STAT SENSES HUMIDITY & CON-

icomfortꢁ

FURNACE (IFC) OR

AIR HANDLER (AHC)

TROLS 24V ꢀH" OUTPUT (& 120V ꢀH" OUTPUT) TO

CYCLE HUMIDIFIER BASED ON DEMAND. NO OTH-

ER CONTROL OR HUMIDISTAT REQUIRED.

OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH

HUMIDIFIER (IF NOT ALREADY IN THE SYSTEM FOR

OTHER FUNCTIONS. BUILT INTO ALL icomfortꢁ OUT-

DISCHARGE AIR SENSOR

(REQUIRED FOR EVEN HEAT)

(SEE DAS NOTE Page 36)

DOOR UNITS). (SEE OAS NOTE Page 36)

icomfortꢁ

THERMOSTAT

RSBus

Maximum total

length of all con-

nections on the

RSBus is limited

to 1500ft.

Wire gauge of

RSBus wire is 18.

NOTE: 24V UV LIGHT

APPLICATIONS

Neither icomfort furnace nor

icomfort air handler transformer

will have adequate VA to power

24V UV light applications. An

additional transformer for UV

light applications is required.

Page 38

506052−01 11/09