Aprilaire 8531 111 137B 97185 Thermostat User Manual

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Your new digital thermostat has been designed to  
provide accurate control and display of room temper-  
ature. In addition, it also will display all relevant infor-  
mation pertaining to your system.  
USER CONTROLS  
INSTALLER NOTES  
MODE  
8
531  
The thermostat is a heat only control and is perma-  
nently in the heat mode.  
Heat Only Thermostat  
OPERATING INSTRUCTIONS  
The clearly marked buttons and informative display  
make it extremely easy to understand and simple to  
use.  
HEATING ꢀ  
Select the temperature you want your equipment to  
maintain while in the heating mode by pressing either  
the or buttons.  
Please take a few moments to read the brief instruc-  
tions and familiarize yourself with the various func-  
tions in order to obtain maximum benefit from this  
truly unique electronic control.  
CELSIUS / FAHRENHEIT  
Simultaneously press  and  to switch between  
Celsius and Fahrenheit temperature display.  
GENERAL INFORMATION  
LIMITED OVERRIDE  
The thermostat normally displays room temperature,  
mode of operation and whether heating is currently  
on. The two buttons on the front of the unit allow  
complete control of the equipment.  
When the keyboard is locked (switch #2 ON), the user  
may override the temperature setpoint for 1 hour by  
pressing either the or buttons. The range of tem-  
perature override is ±3°F or ±3°C from the pro-  
grammed daytime setpoint.  
Raising or lowering the setpoints in heating is as sim-  
ple as pushing a button. In addition, you may choose  
to display the temperature in °F or °C.  
SEE REVERSE FOR INSTALLATION INSTRUCTIONS  
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ELECTRONIC THERMOSTAT  
TWO YEAR LIMITED WARRANTY  
POWER FAILURES  
INSTALLER NOTES  
Your Research Products Corporation Aprilaire™ Thermostat unit is  
expressly warranted for two (2) years from the date of installation to be  
free from defects.  
Research Products Corporation’s exclusive obligation under this war-  
ranty shall be to supply, without charge, a replacement for any thermo-  
stat which is found to be defective within a two (2) year period and  
which is returned 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, together with the model num-  
ber, manufacturing code number and installation date of the thermostat.  
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 CON-  
TRASTED TO DEFECTS IN THE THERMOSTAT ITSELF.  
Your thermostat employs the latest developments in  
solid state electronic technology.  
One of the unique features of your thermostat is that  
no battery is required to maintain your selected set-  
points in the event of a power loss as the memory is  
unaffected by power failures of any duration.  
When power is restored, the thermostat will continue  
operating as if the power had never been off.  
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTIC-  
ULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID TWO  
(
2) YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S LIABILITY FOR  
TEMPERATURE ACCURACY  
INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR  
PERSONAL INJ URIES, 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 UNIT 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  
Full temperature accuracy will be realized only after  
the thermostat has been installed and powered for at  
least one hour.  
lasts or the exclusion or limitation of incidental or consequential dam-  
ages 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.  
This equipment if installed in strict accordance with the manufacturers  
instructions,complies with the limits for a Class B computing device  
pursuant to Subpart J of Part 15 of FCC rules.  
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This page intentionally left blank.  
Model 8531  
111-137B  
97185  
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INSTALLATION INSTRUCTIONS  
THERMOSTAT INSTALLATION  
6. Connect the wires from your system to the thermo-  
s tat terminals as s hown in the wiring diagrams .  
Ca re fully d re s s the wire s s o tha t a ny e xc e s s is  
pushed back into the wall cavity or junction box.  
Ensure that the wires are flush to the plastic subbase.  
The access hole should be sealed or stuffed to pre-  
vent drafts from affecting the thermostat.  
LOCATION  
1
. Insert a flat blade screwdriver or coin 1/8" into the  
slot located in the bottom center of the thermostat  
case and twist 1/4 turn. When you feel or hear a click,  
grasp the case from the bottom two corners and sep-  
arate from the subbase as shown in the diagram at  
the right. Some models require more force than oth-  
ers when separating due to the number of terminals  
on the subbase.  
To ensure proper operation, the thermostat should be  
mounted on an inside wall in a frequently occupied  
area of the building. In addition, its position must be  
at least 18" (46cm) from any outside wall, and approx-  
imately 5' (1.5m) above the floor in a location with  
freely circulating air of an average temperature.  
BE SURE TO AVOID THE FOLLOWING LOCATIONS:  
behind doors or in corners where freely circulating  
air is unavailable  
where direct sunlight or radiant heat from appli-  
ances might affect control operation  
on an outside wall  
adjacent to, or in line with, conditioned air dis-  
charge grilles, stairwells, or outside doors  
where its operation may be affected by steam or  
water pipes or warm air stacks in an adjacent parti-  
tion s p a c e , or b y a n unhe a te d /unc oole d a re a  
behind the thermostat  
-
2
3
. Swing the thermostat out from the bottom.  
. Lift the thermostat up and off the subbase.  
-
4. Place the rectangular opening in the subbase over the  
equipment control wires protruding from the wall and,  
using the subbase as a template, mark the location of  
the two mounting holes (exact vertical mounting is  
necessary only for appearance).  
-
-
-
OFF ON  
5
. Use the supplied anchors and screws for mounting on  
drywall or plaster; drill two 3/16" (5mm) diameter  
holes at the marked locations; use a hammer to tap  
the nylon anchors in flush to the wall surface and fas-  
ten subbase using the supplied screws. (Do not over-  
tighten!)  
REPLACING THE THERMOSTAT  
ON THE SUBBASE  
4 MINUTE  
2 MINUTE  
(MIN ON/OFF)  
(MIN ON\OFF)  
-
-
where its operation will be affected by the supply  
air of an adjacent unit  
near sources of electrical interference such as arc-  
ing relay contacts  
1. Position the thermostat on the hinged tabs located at  
the top of the subbase.  
KEYBOARD UNLOCKED  
KEYBOARD LOCKED  
2
. Gently swing the thermostat down and press on the  
bottom center edge until it snaps in place.  
SPECIFICATIONS  
OUTPUT TERMINAL FUNCTIONS  
Rated Voltage 20-30 VAC, 24 nominal  
RH . . . . . . .24 VAC supply from heating  
Rated  
Current  
0.08 Amps to 1.5 Amps continuous  
per output with surges to 4 Amps Max.  
equipment  
W . . . . . . .Heat energized with a heating call  
Control  
Range  
Heating: 38° to 88°F in 1° Steps  
5° to 30°C in 1° Steps  
Thermostat  
Measurement 28° to 124°F or 0° to 48°C  
Range  
8531  
Line  
Voltage  
RH  
W
W1  
Control  
±.5° C at 20°C  
±1°F at 68°F  
Accuracy  
2
4 VAC  
NOTE: This thermostat contains electronic circuitry  
replacing the conventional mechanical anticipator.  
Transformer  
P.O. BOX 1467 • MADISON, WI 53701-1467  
CALL 608/257-8801 • FAX 608/257-4357  
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