To Test Thermostat
Operation
Setting or Changing the Setpoint Temperature
Changing Fahrenheit (F) to Celsius (C)
The thermostat is preset to display the temperature in degrees
Fahrenheit. You may change the display readout to Celsius if desired.
Wiring Diagrams
The following is just a sample of the most common types of HVAC systems.
Refer to your systems installation manual for wiring information.
Limited Warranty
®
WARNING: DO NOT SHORT (JUMPER) ACROSS TERMINALS OF GAS
VALVE OR SYSTEM CONTROL TO TEST OPERATION. THIS WILL DAMAGE
THE THERMOSTAT AND VOID YOUR WARRANTY.
Your Research Products Corporation Aprilaire Thermostat unit is expressly
1. Press either the
The display will show the current
temperature setpoint.
or
button.
warranted for two (2) years from date of installation to be free from defects in
materials and workmanship.
1. Move the manual switch marked “F” (Fahrenheit) and “C” (Celsius)
located at the top center of the circuit board to the desired setting.
CAUTION: Do not switch system to cool if the temperature is below
HEAT
/
COOL
HEAT ONLY
3-WIRE
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.
5
0°F (10°C). This can damage the air conditioning system and cause
2. Press RESET button located lust below the LCD display to register
the change.
4-WIRE
SINGLE TRANSFORMER
SINGLE TRANSFORMER
personal injury.
Factory-Installed
jumper
Factory- Installed
jumper
The display will change to show the temperature in your desired
temperature scale. To return the thermostat to its original setting,
repeat steps 1 and 2 above.
1. Place the COOL-OFF-HEAT switch
into the COOL position
COOL OFF HEAT
T
T
RH
RH
Transformer
Hot
H
E
R
M
O
S
T
Transformer
Hot
H
E
R
M
O
S
T
COOL OFF HEAT
FAN: AUTO - ON
RC
W
RC
W
1
20 VAC
24 VAC
120 VAC
24 VAC
2
. Press the
button until the
Heating
Control
Heating
Control
temperature setting is at least
THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPO-
RATION 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.
Cooling
Control
Y
Y
3
degrees below the room temperature.
A
T
Fan
Control
A
T
The air conditioning system should
turn on within a few seconds.
2. Press either the
to adjust the temperature setting
either up or down.
or
button
Fan
Control
G
G
TROUBLESHOOTING
Symptom
Remedy
NOTE: When in the COOL mode (or HEAT and COOL for single stage
heat pumps), once the thermostat turns off, a built in 5-minute delay
prevents the system from turning on again. This protects the compressor.
No additional time delay relay is required.
HEAT ONLY
2-WIRE
SINGLE TRANSFORMER
The display will return to the room temperature display five seconds after
the last input and the new setpoint will be saved.
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PAR-
TICULAR 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 AFORE-
SAID 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.
Thermostat does not turn
on system
Check Wiring
(see INSTALLATION).
COOL ONLY
3-WIRE
SINGLE TRANSFORMER
NOTE: Remove factory
installed jumper
Check fuse. Replace with 2 amp
fuse if fuse has opened.
T
RH
T
H
Transformer
Hot
H
E
R
M
O
S
T
RH
COOL OFF HEAT
Changing Temperature Differential
IMPORTANT: The temperature differential is factory set at 1 (.5°). This
means that whenever the room temperature changes by one half of a
degree from the temperature setting, the system will turn on. If the
system turns on too often, increase the temperature differential.
Transformer
3
. Put the COOL-OFF-HEAT switch
RC
W
Hot
RC
W
E
R
M
O
S
T
1
20 VAC
24 VAC
Heating
Control
120 VAC
24 VAC
into the OFF position. The air
Thermostat turns on and
off too frequently.
Increase Temperature Differential
(see DIFFERENTIAL).
conditioning system should turn off.
Y
Cooling
Control
Y
4. Put the COOL-OFF-HEAT switch
into the HEAT position.
A
T
Fan
Control
A
T
COOL OFF HEAT
Display is blank, flashing
or constant “LO BAT”.
Replace batteries.
G
G
1
. Press both
at the same time and hold for one
second.
and
buttons
5
. Press the
temperature setting is at least
degrees above room temperature.
button until the
HEAT
5-WIRE
TWO TRANSFORMER
/COOL
System fan does not
operate properly.
Move fan option switch to either
gas or electric, to match system
(see INSTALLATION).
3
(
HEATING)
NOTE: Cut center of
Transformer
Hot
factory installed jumper
and bend back
The heating system should turn on.
The fan may not turn on immediately,
depending upon the fan delay built
into the furnace.
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.
T
H
E
R
M
O
S
T
RH
RC
120 VAC
24 VAC
NOTE: Both transformers
must be in phase.
Thermostat does not display
proper room temperature.
Check “F” Fahrenheit/”C” Celsius
switch located at top center of
circuit board for proper position.
If a new selection is made, press
Heating
Control
W
Y
COOL OFF HEAT
FAN: AUTO
-
ON
Cooling
Control
This warranty gives you specific legal rights and you may also have other
rights which vary from state to state.
6
. Put the COOL-OFF-HEAT switch
into the OFF position. The heating
system should turn off. The fan may
continue to run for a short period
of time.
COOL OFF HEAT
Hot
120 VAC
24 VAC
Fan
Control
A
T
“
RESET” button located directly
G
(COOLING)
Transformer
below LCD display.
2. Press either the
or
button
to adjust the temperature
differential up or down.
FAN: AUTO - ON
FAN: AUTO - ON
7
. Put the FAN: AUTO-ON switch to
the ON position. The blower fan
should turn on.
HEAT PUMP WITH
COOL ACTIVE
REVERSING VALVE
HEAT PUMP WITH
HEAT ACTIVE
REVERSING VALVE
If problems with thermostat cannot be solved, call:
The display will show:
Technical Support: 608-257-8801
Monday-Friday 7:45 am-5:00 pm CST
Pre-Installed jumper
Pre-Installed jumper
8
. Put the FAN: AUTO-ON switch to
the AUTO position. The blower fan
should turn off.
RH
RC
RH
RC
T
H
E
R
M
O
S
T
T
H
E
R
M
O
S
T
Differential
Setting Degrees
Transformer
Hot
Transformer
Hot
1
20 VAC
24 VAC
120 VAC
24 VAC
W
W
G
1
2
3
1°F/.5°C
2°F/1.0°C
3°F/1.5°C
Fan
Relay
Fan
Relay
G
Y
Compressor
Contactor
Compressor
Contactor
Y
A
T
A
T
Reversing
Valve
O
B
O
B
Re Vv ae lr vs ei ng
The display will return to the room temperature
five seconds after the last input.
NOTE: Installer must place jumper
between “W” and “Y” terminals.
NOTE: Installer must place jumper
between “W” and “Y” terminals.
P.O. BOX 1467 • MADISON, WI 53701-1467
™
Products For Better Indoor Air Quality
B2202515 REV. 12/00
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