Aprilaire 8535 Thermostat User Manual

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10-965B 7/12/01 9:12 AM Page 1

ELECTRONIC THERMOSTAT

Owner ’s Manual

MODELS

535, 8536 & 8537

Digital Heat Pump Thermostats

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OWNER’S MANUAL – TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Getting Familiar With The Aprilaire Thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

•

Temperature Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Mode Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Temperature Settings – Day/Night Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Fan Button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Outdoor Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Setting Up The Aprilaire Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Operating The Aprilaire Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Changing The Current Temperature Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Optional Feature – Locking The Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Setting High And Low Balance Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

In Case Of Power Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Limited Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Research Products Corporation 2001

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IMPORTANT: READ ALL INSTRUCTIONS THOROUGHLY

Introduction

Thank you for your recent Aprilaire Electronic Thermostat purchase. We sincerely

appreciate your business and are pleased to add your name to our growing list of customers.

With this purchase, you have invested in the highest quality equipment currently available.

Please be assured that in addition to product quality, we are committed to total product

performance and complete customer satisfaction.

Now, please take a few minutes to familiarize yourself with your new Aprilaire Thermostat.

In order to take advantage of all the benefits of your new thermostat, it is important that you

understand how to operate it.

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Aprilaire

Digital Heat Pump Thermostat

Center LED illuminates

when back-up heat

source is being used.

(Models 8536 & 8537

only)

Temperature ˚F or ˚C.

Room temp. normally

displayed. Press

Outdoor button to

display outdoor temp.

Model 8041 required).

Heat and Cool Mode

icons. Both displayed

during Auto Mode.

(

Flame flickers during

heat call and Snowflake

flashes during cool call.

Set-point icon displays

the active set point

Displays mode when

changing (Heat, Cool,

Emergency Heat, Off,

and Auto). (Emergency

Heat Models 8536 &

(

full sun = Day set

point, partial moon

Night set point).

Mode

Fan

Outdoor

8537 only)

Day/Night

Press to select Heat/

Emergency Heat/Cool/

Auto/Off. (Emergency

Heat Models 8536

Press to display

outdoor temperature

(w/optional Model 8041

Remote Outdoor

Sensor only).

8537 only)

Press for continuous

fan. Press again to

resume to auto fan.

Press to change

set point to either

the Day or Night

preset value.

Press to raise and lower set point. Press both at the

same time to switch between ˚F and ˚C. Press and

release to view current set point.

Fan icon displays during

continuous fan only.

Figure 1 - Display and Button Description

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Getting Familiar with the Aprilaire Thermostat

(refer to Figure 1)

The LCD (Liquid Crystal Display) normally shows: the room temperature, the current mode of operation, if

the Day or Night temperature setting is being used, and if the system fan is set for continuous operation.

Temperature Display

Room temperature can be displayed in either degrees Fahrenheit or degrees Celsius. If the displayed

temperature seems abnormally high or low (example: 70˚F is equal to 21˚C), press the DECREASE

button and INCREASE

button simultaneously to switch between ˚F and ˚C.

Mode Button

Four modes of operation are available for all the DSL heat pump thermostat models: Heat, Cool, Auto,

and Off. Additionally, with the Models 8536 and 8537, Emergency Heat mode is available. The mode of

operation indicates how you want your heating and cooling equipment to operate. Press the MODE

button until the desired mode of operation shows on the display.

Temperature Settings - Day/Night Button

The thermostat stores four temperature settings in its memory, two for heating (Emergency Heat uses the

same set points as the Heat mode) and two for cooling. The two temperatures for each mode are called

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the Day setting ”

“ (a sun icon appears on the display) and the Night setting “ “ (a moon icon

appears on the display). The Day setting is intended to be an occupied or comfort setting and the Night

setting is intended to be an unoccupied or energy savings setting. For example the four settings stored

in the memory of the thermostat might be as shown in Table 1. Pressing the DAY/NIGHT button allows

you to instantly change to a more economical setting when leaving the house or going to bed, and to

a comfort setting when returning home or waking up. This

MODE

Heat

DAY

68˚F

78˚F

NIGHT

60˚F

thermostat is equipped with accessory inputs which can be used

to automatically switch between day and night set points; contact

your installing contractor for more details.

Cool

85˚F

Table 1 – Typical Set Point Values

Fan Button

The system fan will operate automatically during a heating or cooling cycle. If it is desired to run the fan

continuously, press the FAN button, and a Fan “

“ icon will appear on the display.

Outdoor Button

This button will be made functional when the optional Aprilaire Model 8041 Remote Outdoor Sensor has

been installed. It can then be used to find out the outdoor temperature from indoors. If the Model 8041

Remote Outdoor Sensor has not been installed, two dashes “– –” will appear on the display when this

button is pushed.

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Setting Up The Aprilaire Thermostat

To ensure accurate temperature control, observe the following simple guidelines:

•

When the thermostat is operating, close the cover to allow proper air circulation over the

temperature sensor.

•

Do not place anything which can give off warm or cool air, such as candles or portable humidifiers,

near the thermostat.

. Adjusting the Heat Temperature Settings. There are

two settings, the Day setting “ “ (a sun icon

appears on the display) and the Night setting “

a partial moon icon appears on the display).

See Figure 2.

“

(

a. Press the MODE button repeatedly until HEAt

appears on the display.

b. Press the DAY/NIGHT button until the “

Day setting) appears on the display.

c. Use the DECREASE button and INCREASE

button to adjust the setting.

“ icon

(

DDAAYY

NNIIGGHHTT

Figure 2 - Adjust Heat Settings

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d. Press the DAY/NIGHT button until the “ “ icon (Night setting) appears on the display.

e. Use the DECREASE

button and INCREASE

button to adjust the setting.

2. Adjusting the Cool Temperature Settings. There are two

settings, the Day setting “ “ (a sun icon appears on

the display when this setting is being used) and the Night

setting “ “ (a partial moon icon appears on the display

when this setting is being used). See Figure 3.

a. Press the MODE button repeatedly until COOL

appears on the display.

b. Press the DAY/NIGHT button until the “

Day setting) appears on the display.

c. Use the DECREASE button and INCREASE

button to adjust the setting.

d. Press the DAY/NIGHT button until the “ “ icon (Night setting) appears on the display.

e. Use the DECREASE button and INCREASE button to adjust the setting.

“ icon

(

DAY

NIGHT

DAY

Figure 3 - Adjust Cool Settings

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Operating The Aprilaire Thermostat

1. Select the mode of operation by repeatedly pressing the MODE button until the desired mode

appears on the display (“E ht” = Emergency Heat – Models 8536 and 8537 only). The heating and

cooling system may be turned off by selecting the “OFF” mode. Do not set to the “OFF” mode

during periods when freezing temperatures may occur.

•

COOL: In the “COOL” mode a Snowflake “

“ icon appears on the display, which flashes

when the heat pump is running.

HEAT: In the “HEAt” mode a Flame “ “ icon appears on the display, which flickers when the

heat pump is running.

EMERGENCY HEAT (Models 8536 and 8537 only): In the Emergency Heat mode, “E ht” appears on

the display and only the back-up heat source (other than the heat pump) will be used to maintain

temperature. The center LED (located at the top of the thermostat) will light when the back-up

heat source is running.

•

AUTO: In the “AUtO” mode, the heat pump will operate in either the “HEAt” or “COOL” mode

depending on which current setting the room temperature is closest to. Note that both the

Snowflake “

“ and Flame “ “ icons appear on the display.

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. Select the temperature setting to be used by pressing the DAY/NIGHT button until the

desired previously stored temperature setting (Day or Night) appears on the display. Use the

DECREASE button and INCREASE button to change the temperature if desired (NOTE

that if changed, the new set point will be permanently stored in memory - see CHANGING THE

CURRENT TEMPERATURE SETTING).

3. After approximately 5 seconds the thermostat will return to the normal display.

Note: This thermostat utilizes time delays to protect the heating and cooling equipment. If the

equipment does not shut off or turn on immediately when the temperature setting has been

changed, it may be due to the built-in time delays (4 minutes max.).

4. Press the Fan button, if it is desired, to run the fan continuously. A Fan “

“ icon will appear

on the display when the fan is set to operate continuously.

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Changing The Current Temperature Setting

. Press and release either the DECREASE button to see the current

temperature setting. The setting, a Thermometer icon and a Double Arrowhead icon will appear

see Figures 2 and 3 on pages 5 and 6).

button or INCREASE

(

. Change the temperature setting:

OPTION 1 – Use the DECREASE

DECREASE button or INCREASE

button or INCREASE

button. Press and hold the

button to change the current temperature setting. The

thermostat remembers the most recent temperature settings. For example, if the Day, Cool

temperature shown in Figure 3 were changed from 78˚F to 76˚F, the 76˚F setting would remain in

memory as the Day, Cool setting.

Note: The Cool temperature setting must remain 2˚F higher than the Heat temperature setting for

both the Day and Night sets. The thermostat will automatically update the setting not being

changed. In the example above, if the Day, Heat setting was 75˚F, the thermostat would have

automatically changed the setting to 74˚F when the Cool setting was changed to 76˚F.

OPTION 2 – Use the DAY/NIGHT button. Press the DAY/NIGHT button to instantly change the

temperature setting to one of the two settings stored in memory.

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Optional Feature – Locking The Keypad

If tampering with the thermostat is expected and unwanted, the keypad can be locked by changing the

position of the Keypad Lock DIP switch (switch no.4) from the factory set OFF position to ON.

The DIP switches are located inside the thermostat on the circuit board. To access the DIP switches,

refer to the Installation Instructions that came with the thermostat, or consult your contractor.

In the locked position, only the following functions can be done:

•

The outdoor temperature button will display the outdoor temperature.

The thermostat will default to the Day setting.

The DECREASE

button and INCREASE

button will temporarily change the Day setting

a maximum of ±6°F (±3°C) for a period of 3 hours before the thermostat automatically returns to

the Day setting.

If the thermostat does not respond when a button is pushed, it may be because the keypad has been

locked. A Lock “ “ icon will appear when a button other than Outdoor is pushed if the keypad has

been locked.

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Setting High And Low Balance Points

(Models 8536 & 8537 only)

High and low balance points can only be accessed if the Aprilaire Model 8041 Remote Outdoor Sensor

has been installed. To check if this optional accessory has been installed, press the Outdoor button. If a

temperature appears, the Model 8041 Remote Outdoor Sensor has been installed.

During heating, heat pumps operate by extracting energy out of the outdoor air and transferring it to

the indoor air. This process is efficient over a wide range of temperatures. However, at low outdoor

temperatures there is a point at which it becomes more economical to operate the back-up heat without

the heat pump. This is called the Low Balance Point,“Lo bP ”. Conversely, the use of back-up heat with

the heat pump during mild weather could use more energy than is required to heat the home. At

outdoor temperatures exceeding the High Balance Point,“Hi bP ”, use of the back-up heat is limited

to Emergency Heat operation only.

To review the set points, press and hold the Outdoor button and press the Fan button. “Hi bP” and its

temperature value will appear on the display. Next, press the Outdoor button again and “Lo bP” and

its temperature value will appear on the display. After approximately 15 seconds the display will return

to normal.

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After accessing a balance point, it can be changed by pressing the DECREASE

button or

INCREASE

button. This should only be done after consulting with a qualified contractor. Improperly

set balance points can result in increased energy expenses and possible equipment damage.

In Case Of Power Failure

This thermostat does not require a battery. If the power goes out, the display is blank. During the

period that the power is off, the heating/cooling system will not operate. When the power is restored,

the thermostat will default to the Day setting and the current mode of operation at the time of the

power outage.

This thermostat is equipped with a continuous memory feature which does not require any battery.

The thermostat will never lose the four programmed temperature settings regardless of the length of

the power outage.

Cleaning

If the surface of the thermostat becomes dirty it can be cleaned with plain water or many non-abrasive

household cleaners, such as glass cleaner. When using any cleaner be careful not to get any into the

interior of the thermostat. Do not spray any cleaner directly onto the thermostat. Spray the cleaner onto

a soft cloth and wipe the surface of the thermostat.

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Limited Warranty

Your Research Products Corporation Aprilaire Thermostat unit is expressly warranted for two (2) years from date of

installation to be free from defects in materials and workmanship.

Research Products Corporation ’s exclusive obligation under this warranty shall be to supply, without charge, a

replacement for any thermostat which is found to be defective within a two (2) year period and which is returned, together

with the date of installation, no later than thirty (30) days after said two (2) year period by you to either your original

supplier or to Research Products Corporation, Madison, Wisconsin 53701.

THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL

NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO

DEFECTS IN THE THERMOSTAT ITSELF.

IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL

BE LIMITED IN DURATION TO THE AFORESAID TWO YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S

LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR PERSONAL INJURIES,

RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS

EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE THIS

THERMOSTAT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR. IF THE LIMITED

WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS OF IMPLIED

WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION.

Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or

consequential damages, so the above exclusion or limitations may not apply to you.

This warranty gives you specific legal rights and you may also have other rights which vary from state

to state.

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The Aprilaire Total Indoor Air Comfort System is an integrated group of air quality enhancement

products designed to work with your heating and cooling system to make your home more comfortable.

For the best in indoor air quality, ask your heating and cooling contractor about these fine

Aprilaire products, or visit us at www.aprilaire.com for your Indoor Air Solutions.

Automatic Humidifier

The Best Cure For Dryness

High Efficiency Air Cleaner

Nobody Makes Clean Air Easier

Fresh Air Exchanger

™

Only The Freshest Homes Have April Air

The world ’s first computer-equipped,

completely automatic humidifier.

The economical, trouble-free, high

efficiency air cleaner for your home. supply of fresh air with energy-recovery.

Your best value for a constant, controlled

Zone Control System

Custom Comfort Throughout Your Home

Electronic Thermostat

Energy Efficiency Never Looked So Good

™

The most reliable way to achieve temperature

control in every area of your home.

Ultra-thin, easy-to-use programmable or digital

controls featuring pinpoint accuracy.

P.O. BOX 1467 • MADISON, WI 53701-1467

™

Products For Better Indoor Air Quality

B2202210 REV. 04/01

110-965B

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