Carrier 50QE900 Thermostat User Manual

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50QE900

Aquazone™ Water Source Heat Pump

Commercial Light-Activated

Programmable Thermostat

Owner’s Manual

Part Number 50QE900-220LA

CONTENTS

CONFIGURATION

Page

Thermostat Display — The thermostat display is locat-

ed in the center of the thermostat. See Fig. 1. The following

information can be displayed on the screen:

GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Thermostat Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Heat or Cool Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Thermostat Front Panel Buttons . . . . . . . . . . . . . . . . . 1

Thermostat Programming Buttons . . . . . . . . . . . . . . . 2

Set Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Programming Thermostat Schedules. . . . . . . . . . . . . 3

OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4,5

Auto-Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Light-Activated Operation. . . . . . . . . . . . . . . . . . . . . . . . 4

Two-Stage Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Clock Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Fan Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Emergency Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Holiday Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

• mode (OFF, HEAT, COOL, AUTO, or PROGRAM ON)

• fan setting (FAN ON or blank)

• override indication

• room temperature

• desired temperature

• service filter indicator

•

time of day

day of the week

schedule period (Occupied 1, 2, or 3; or Unoccupied)

setup indicator (Programming mode)

lock indicator

start/stop indicator (schedule period Programming mode)

IMPORTANT: Read entire instructions before program-

ming the thermostat.

GENERAL

Carrier’s Aquazone 7-day, commercial, programmable ther-

mostats are wall-mounted, low-voltage thermostats which

maintain room temperature by controlling the operation of an

HVAC (heating, cooling and ventilation) system. Separate

heating and cooling set points and auto-changeover capability

allow occupied and unoccupied programming schedules for

energy savings.

Fig. 1 — Thermostat Display

All thermostats allow up to 3 occupied and one unoccupied

time/temperature setting to be programmed per 24-hour period.

Each thermostat stores programs for 7 independent days.

Batteries are not required. During power interruption the inter-

nal NEVERLOST™ memory stores programs for an unlimited

time.

Heat or Cool Indicator — A Heat or Cool indicator is

located on the bottom left cover of the thermostat. See Fig. 2.

The light will be red if the thermostat is in Heating mode. The

light will be green if the thermostat is in Cooling mode.

IMPORTANT: The thermostat has a configurable security

level. If certain functions are not available (changing set

points, changing programming schedules), the thermostat

security level may be configured to exclude those func-

tions. Call the installer to reconfigure the security level.

Thermostat Front Panel Buttons — The thermostat

has buttons on the front cover which are used to raise or lower

the desired set point and override the current program. See

Fig. 2.

SET POINT BUTTONS — The UP ARROW and DOWN

ARROW buttons will raise or lower the current desired tem-

perature set point. If the thermostat is in AUTO mode, pressing

the UP ARROW or DOWN ARROW buttons will adjust both

the heating and cooling set points. Pressing the UP ARROW or

DOWN ARROW buttons in Cooling mode will adjust only the

cooling set points. Pressing the UP ARROW or DOWN

ARROW buttons in Heating mode will adjust only the heating

set points. The UP ARROW and DOWN ARROW buttons are

also used in Programming mode.

A light sensor is provided on the thermostat for light activa-

tion. When the sensor detects light (the space is occupied), the

thermostat will enter Occupied 1 mode. If the room is dark, the

thermostat will follow its programmed schedule.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

PC 111 Catalog No. 535-00110 Printed in U.S.A. Form 50QE-3SO Pg 1 6-03 Replaces: New

Book 1

Tab 5a 5a

OVERRIDE BUTTON — The Override button is used to

force the thermostat from Unoccupied mode into the Occu-

pied 1 mode comfort settings. The Override period will be set

at 30 minutes. To increase the amount of time in Override

mode, press the Override button again. Thirty minutes of over-

ride time will be added for each time the Override button is

pressed up to a maximum of 4 hours. After the 4-hour limit has

been reached, press the Override button again to cancel over-

ride mode.

While in Override mode, the Override icon and the Occu-

pied 1 icon will be displayed on the thermostat. The time of

day and the minutes remaining in Override mode will alternate

on the thermostat display.

The set points are adjustable with the UP ARROW and

DOWN ARROW keys during Override mode.

NOTE: If the thermostat is in Occupied mode and the Override

button is pressed, the thermostat will go into Unoccupied mode

immediately. The thermostat will remain in Unoccupied mode

until the next Occupied start time.

The thermostat is unlocked by performing the same proce-

dure. Press and hold the Mode button. While holding down the

Mode button, press the Up and Down Arrow buttons simulta-

neously. The ‘‘Locked’’ icon will be removed from the display.

FAN BUTTON OPERATION — The Fan button selects fan

operation. When the fan is set to FAN ON, the fan will run con-

tinuously for improved air circulation.

NOTE: When the thermostat is in Unoccupied mode, the fan

will run only during heating or cooling operation, even if the

fan is set to FAN ON; this is the energy-saving smart fan

feature.

When the fan is not set to FAN ON (no icon displayed on

thermostat screen), the fan will run during heating and cooling

operation only.

MODE BUTTON OPERATION — The Mode button se-

lects the operating mode of the thermostat. If OFF is selected,

the thermostat will not enter Heating or Cooling mode. If

HEAT is selected, the thermostat will only enter Heating mode

(if the room temperature is below the heating set point).

If COOL is selected, the thermostat will only enter Cooling

mode (if the room temperature is above the cooling set point).

If AUTO is selected, the thermostat will enter Heating or Cool-

ing mode based on the room temperature and the heating and

cooling set points. If PROGRAM ON is selected, the stored

schedule is enabled and the thermostat will follow the Occu-

pied and Unoccupied schedules stored in its memory.

Thermostat Programming Buttons — The thermo-

stat has programming buttons which are used to change the set

points of the thermostat, set the modes, and program schedules.

The programming buttons are accessible from underneath the

thermostat cover. To access the programming buttons, pull on

the hinged thermostat cover. See Fig. 3. The programming

buttons are: Mode, Fan, Holiday, Program, and Set Clock.

Auto-Changeover — When the thermostat mode is set to

AUTO, the thermostat will provide automatic changeover from

Heating to Cooling mode and Cooling to Heating mode when

required. The thermostat will automatically switch to maintain

the desired temperature setting. The thermostat does not need

to be manually changed from heating to cooling or cooling to

heating operation.

HOLIDAY MODE — The Holiday button places the thermo-

stat into Holiday mode. During Holiday mode, the unoccupied

set points are enforced. The number of days the thermostat will

be in Holiday mode can be set.

The UP ARROW and DOWN ARROW buttons are used to

scroll through programming set points. The buttons are also

used to answer yes or no.

KEYPAD LOCK — The thermostat has a keypad lockout

feature which will not acknowledge front panel buttons until

the lockout sequence is entered. To disable or lock the keypad,

press and hold the Mode button. While holding down the Mode

button, press the UP and DOWN ARROW buttons simulta-

neously. The ‘‘Locked’’ icon will appear on the display.

Set Clock — The Set Clock button allows the user to

change the time and day displayed on the thermostat. Press the

Set Clock button to enter Set Time mode. See Fig. 4. The cur-

rent time will blink on and off. Press the UP ARROW and

DOWN ARROW buttons until the correct time is shown. Hold

down the buttons to quickly move through the time display.

The AM and PM annunciators will automatically change. To

scroll through by hours only, press and hold down the Fan

button while pressing the UP or DOWN ARROW buttons. To

ensure the schedules are properly followed, make sure that

AM or PM is correct for the time chosen. When the correct

time is shown, press the Mode/Next button to modify the day

of the week. The current day will blink on and off. Press the UP

ARROW and DOWN ARROW buttons until the correct day is

shown. Press the Set Clock button again to exit the Set Time

mode.

Fig. 2 — Thermostat Front Panel Buttons

Fig. 3 — Thermostat Programming Buttons

Fig. 4 — Setting the Clock

Programming Thermostat Schedules — Before

programming the thermostat, plan the thermostat daily sched-

ule. The schedule is divided into 7 days (Monday through

Sunday). Each day can have 2 (Occupied 1, Unoccupied), 3

99 F (1 to 37 C). Press the Mode button to continue. See

Fig. 5.

. The heating set point for Occupied 1 will be displayed.

Use the UP ARROW and DOWN ARROW buttons to

raise or lower the heating set point until the desired tem-

perature is shown. The range of acceptable values is 35 to

(

Occupied 1, Occupied 2, Unoccupied), or 4 (Occupied 1,

Occupied 2, Occupied 3, Unoccupied) time periods. Each

occupied time period has a start time, stop time, heating set

point and a cooling set point. The unoccupied time period has a

heating set point and a cooling set point. The unoccupied time

period is active whenever an occupied time period is not

active. Fill in Table 1 below as an aid to programming the daily

schedules.

9 F (1 to 37 C). Press the Mode button to continue. See

Fig. 5.

NOTE: When the sensor detects light (the space is occupied),

the thermostat will enter Occupied 1 mode. If the room is dark,

the thermostat will follow its programmed schedule. The

Occupied 1 schedule should be turned OFF to keep the ther-

mostat from entering Occupied 1 while the room is unoccu-

pied. If the Occupied 1 schedule is turned ON, the thermostat

will enter Occupied 1 per the schedule regardless of light acti-

vation. The Occupied 1 set points are used as the heating and

cooling set points during light activation. The Unoccupied set

points should be used as non-work hour set points (before

Fig. 5 — Setting Occupied 1 Set Points

:00 AM and after 5:00 PM) when using light activation. For

times when the building is unoccupied during work hours

Monday through Friday, 8:00 AM to 5:00 PM), the Occupied

schedule should be turned ON, and can be used for moderate

. The cooling set point for Unoccupied will be displayed.

Use the UP ARROW and DOWN ARROW buttons to

raise or lower the cooling set point until the desired tem-

perature is shown. The range of acceptable values is 35 to

9 F (1 to 37 C) or ‘‘OF’’ (no unoccupied cooling). Press

the Mode button to continue.

. The heating set point for Unoccupied will be displayed.

Use the UP ARROW and DOWN ARROW buttons to

raise or lower the heating set point until the desired tem-

perature is shown. The range of acceptable values is 35 to

99 F (1 to 37 C) or ‘‘OF’’ (no unoccupied heating). Press

the Mode button to continue.

. The day of the week will be shown. Use the UP ARROW

and DOWN ARROW buttons to change the day of the

week until the desired starting day is shown. Possible

choices are M (Monday) through S (Sunday). Press the

Mode button when the desired day is shown.

(

energy savings with set points of 80 F for cooling and 65 F for

heating.

PROGRAMMING MODE — To program the daily sched-

ules, perform the following procedure:

. Enter Programming mode by pressing the Program

button. The Occupied 1 annunciator will appear on the

thermostat display. See Fig. 5. Use the UP ARROW and

DOWN ARROW buttons to set the maximum number of

Occupied periods available. The thermostat can be set to

, 2, or 3. After the number of Occupied periods has been

selected, press the Mode button.

. The cooling set point for Occupied 1 will be displayed.

Use the UP ARROW and DOWN ARROW buttons to

raise or lower the cooling set point until the desired tem-

perature is shown. The range of acceptable values is 35 to

Table 1 — Daily Schedule Planner

SCHEDULE

Occupied 2

Start / Stop / Heat / Cool

DAY

OF THE

WEEK

Occupied 1

Start / Stop / Heat / Cool

Occupied 3

Start / Stop / Heat / Cool

Unoccupied

Heat / Cool

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Sunday

NOTE: The cooling temperature set point must be higher than the heating temperature set point.

. The Start Time for Occupied 1 will be displayed. Use the

UP ARROW and DOWN ARROW buttons to raise or

lower the time until the desired Start Time is shown.

Press the Mode button to continue. See Fig. 6.

NOTE: The thermostat will continue to follow the sched-

ule until a new one is entered.

•

If only one occupied schedule is selected, the Occupied

and 3 schedules are skipped.

•

If the start time is set later in the day than the stop time,

the program will run from midnight of that day to the

stop time and then from the start time to midnight.

•

If the same start and stop times are programmed for an

occupancy schedule, the thermostat will be in Occupied

mode for 24 hours.

If one occupied period starts or stops within another

occupied period, the lower numbered schedule has pri-

ority. For example, if schedule Occupied 3 is running

for 24 hours and occupied schedule 2 comes on from 1

to 3 PM, the set points from Occupied 2 are in effect

from 1 to 3 PM.

Fig. 6 — Start Time Display

OVERRIDING THE SCHEDULE — The schedule can be

overridden during operation by pressing the UP or DOWN

ARROW buttons to change the desired temperature. The ther-

mostat will use the new set point until the next scheduled time

period starts.

. The Stop Time for Occupied 1 will be displayed. Use the

UP ARROW and DOWN ARROW buttons to raise or

lower the time until the desired Stop Time is shown. Press

the Mode button.

. The On/Off icon will be displayed. Use the UP ARROW

to turn the Occupied 1 period ON for this day. Use the

DOWN ARROW to turn the Occupied 1 period OFF for

this day.

0. Repeat Steps 2 through 9 to program the remaining

schedule for occupied periods 2 and 3 (if selected in

Step 1).

1. The Copy command can be used to copy the previous

day’s schedule if the schedules are the same. The copy

command becomes available after all the occupied peri-

ods are programmed in a day. Use the UP ARROW to

change the copy command to YES. Use the DOWN

ARROW to change the copy command to NO. Press the

Mode button when the choice has been made. See Fig. 7.

OPERATION

The Mode button selects the operating mode of the thermo-

stat. If OFF is selected, the thermostat will not enter Heating or

Cooling mode. If HEAT is selected, the thermostat will only

enter Heating mode (if the room temperature is below the heat-

ing set point). If COOL is selected, the thermostat will only en-

ter Cooling mode (if the room temperature is above the cooling

set point). If AUTO is selected, the thermostat will enter Heat-

ing or Cooling mode based on the room temperature and the

heating and cooling set points. If PROGRAM ON is selected,

the stored schedule is enabled and the thermostat will follow

the Occupied and Unoccupied schedules stored in its memory.

Auto-Changeover — When the thermostat mode is set

to AUTO, the thermostat will provide automatic changeover

from Heating to Cooling mode and Cooling to Heating mode

when required. The thermostat will automatically switch to

maintain the desired temperature setting. The thermostat does

not need to be manually changed from heating to cooling or

cooling to heating operation.

If NO was selected, the schedule will automatically

change to the next day and the user must enter the occu-

pied and unoccupied schedules for that day.

NOTE: Occupied 1 schedule heating and cooling set

points are the same for each day. Occupied 2 and 3 set

points may be set to different values for each day of the

week.

If YES was selected, the schedule will be copied to the

next day. The schedule copy may be repeated until Sun-

day is reached. The Sunday schedule cannot be copied to

Monday.

Light-Activated Operation — A light sensor is pro-

vided on the thermostat for light activation. The thermostat

must be in Program On mode for light activation to be initiated.

When the sensor detects light (the space is occupied), the ther-

mostat will enter into Occupied 1 mode and heat or cool ac-

cording to the Occupied 1 set points. If the room is dark, the

thermostat will follow its programmed schedule.

2. After all the times and set points for each day have been

entered, press the Program button to finish entering the

schedule.

NOTE: Light activation does not work in Holiday mode.

Two-Stage Operation — The second stage of heat or

cool is turned on when the first stage has been on for a mini-

mum of 2 minutes and the temperature differential from the set

point is equal to or greater than the set point plus the deadband

plus 2 degrees.

Clock Backup — In the event of a power loss, the ther-

mostat will keep time for a minimum of 48 hours without ex-

ternal power or batteries.

Fan Operation — If Fan On is selected, the fan will run

continuously during occupied schedule (except when Mode is

switched to OFF). The fan will be off during unoccupied

schedule except during heating or cooling operation.

Fig. 7 — Copy Command Display

If Fan On is not selected, the fan will only operate during

heating or cooling operation.

Emergency Heat — Emergency heat is available for

heat pump applications. To turn on emergency heat, press and

hold the Fan button. While holding the Fan button, press the

UP button for 2 seconds. An ‘‘EH’’ will be displayed. During

emergency heat, the fan will operate and the second stage of

heat will be energized (locking out the first stage compressor).

To exit emergency heat, press and hold the Fan button. While

holding the Fan button, press the UP button for 2 seconds. Dur-

ing emergency heat, only OFF and HEAT modes are available.

DOWN ARROWS to select the number of days that the holi-

day schedule will be in effect. A value of 0 disables Holiday

mode. The duration can be set from 1 to 99 days. The thermo-

stat will enter Holiday mode on midnight of the next day after

the mode has been activated. Holiday mode will remain in

effect until midnight of the last configured day.

If the Holiday mode is in effect, the number of days remain-

ing will blink on and off and the ‘‘Unoccupied’’ icon will be

displayed. The Override button will be active during Holiday

mode. The Dry Contact Switch is ignored.

Holiday Mode — When the thermostat is in Holiday

mode, the thermostat will operate under Unoccupied set points.

To configure and activate the Holiday mode, press the Holiday

button. The ‘‘HOL’’ icon will be displayed along with the

remaining days of Holiday mode operation. Press the UP or

To turn off the Holiday mode before the remaining config-

ured days have passed, press the Holiday button to enter the

configuration mode. Press the DOWN ARROW to set the

number of days to zero. Holiday mode will be disabled.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

PC 111 Catalog No. 535-00110 Printed in U.S.A. Form 50QE-3SO Pg 8 6-03 Replaces: New

Book 1

Tab 5a 5a

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