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Limited Warranty
Your Research Products Corporation Aprilaire
®
Thermostat unit is expressly warranted for two (2) years from date of installa-
tion to be free from defects in materials and workmanship. Research Products Corporation’s exclusive obligation under this war-
ranty 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 DURA-
TION 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 WAR-
RANTY 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 CON-
TRACTOR, 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 con-
sequential 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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BGE
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LC
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APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT
R-VR
Y1
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E
W1
X
LENNOX LOW VOLTAGE TERMINAL BOARD
APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT CONVERSION TO LENNOX
HP21 WITH CB21 PCB HEAT PUMP SYSTEMS
THE LOW VOLTAGE TERMINAL DESIGNATIONS AND THEIR DESCRIPTION AND/OR
FUNCTION ARE USED ON ALL SPLIT SYSTEM CONDENSORS AND HEAT PUMPS
24 VAC, RETURN
COMPRESSOR CONTACTOR
REVERSING VALVE [COOLING MODE]
FAN CONTACTOR CIRCUIT
EMERGENCY HEATING CIRCUIT
2ND. STAGE HEATING CIRCUIT
24 VAC, COMMON
L
Y2
R
Y1
O
BGE
W2
LC
Y2
APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT
R-VR
M
R
F
E
Y
X
LENNOX LOW VOLTAGE TERMINAL BOARD
APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT CONVERSION TO LENNOX
HP22 WITH CB19 PCB HEAT PUMP SYSTEMS
THE LOW VOLTAGE TERMINAL DESIGNATIONS AND THEIR DESCRIPTION AND/OR
FUNCTION ARE USED ON ALL SPLIT SYSTEM CONDENSORS AND HEAT PUMPS
24 VAC, RETURN
COMPRESSOR CONTACTOR
REVERSING VALVE [HEATING MODE]
FAN CONTACTOR CIRCUIT
EMERGENCY HEATING CIRCUIT
2ND. STAGE HEATING CIRCUIT
SYSTEM MONITOR LED
24 VAC, COMMON
2ND. STAGE COOLING CIRCUIT
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Y2
P.O. BOX 1467 • MADISON, WI 53701-1467
Products For Better Indoor Air Quality
™
B2202518 REV. 12/00