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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8 42
F1125 BDP no. 3442DP90; used with T872G1117,
G1166, G1174.
Y594G1252 Wiring differences (old=new): C=X.
F1133 Williamson; heat pump; EM. HT. LED; heat
mode changeover; compressor lockout in
EM. HT.; used with T872N1010.
T874N1016/
Q674F1220
F1141 Westinghouse; EM. HT. LED; auto fan in
EM. HT.; used with T872G1034.
Y594G1252 Wiring differences (old=new):
W=W2.
F1158 Rheem Ruud; heat pump; EM. HT. LED; cool
mode changeover; compressor lockout in
EM. HT.; used with T872G1083, G1133, G1141;
auto fan in EM. HT.
Y594G1252
F1166 Crispaire; EM. HT. LED; used with T872G1208. Y594G1252
F1174 Carrier no. HH93AZ081; EM. HT. LED. Q674F1022
F1182 Square D no. HCB-1; Chek Lite; R-X2 jumper;
System: Aux. Heat replaces EM. HT.
Q674F1022 R-X2 jumper; add monitor switch
between X1 and low side of power.
F1190 EM. HT. LED; X2-E and RC-RH jumpers. None
F1208 TRADELINE; cool mode changeover; EM. HT.
LED; used with T872G1224.
Y594G1419
F1216 TRADELINE; heat mode changeover; EM. HT.
LED; used with T872N1028.
T874N1016/
Q674F1220
F1224 Heatwave (Southwest Mfg.); compressor
lockout in EM. HT.; EM. HT. LED; used with
T872G1232.
Y594G1252
F1232 Rheem; cool mode changeover; EM. HT. and
AUX. HEAT LEDs; compressor lockout in
EM. HT.; used with T872G1133.
Y594G1252
F1240 Lennox; cool mode changeover; EM. HT. and
SERVICE LEDs; used with T872G1240.
None
F1257 Westinghouse; cool mode changeover;
EM. HT. and AUX. HEAT LEDs; auto fan in
EM. HT; used with T872G1034.
Y594G1252 Wiring differences (old=new):
W=W2.
F1265 Wesco Addison; Chek and EM. HT. LEDs; used
with T872G1281, G1265.
Y594G1252 Wiring differences (old=new): C=X.
F1273 Southwest special; no. 0361-136; W2-X2
jumper.
None
F1281 Luxaire special; used with T872G1315. Y594G1252
F1299 Bard special; used with T872N1036, N1044. T874N1016/
Q674F1220
F1315 Williamson special; used with T872N1010. T874N1016/
Q674F1220
F1323 Crispaire special; used with T872G1208. Y594G1252
Q672G System: OFF-AUTO. Fan: None.
G1009 Standard OEM Q674G1070
G1017 Singer; O-B jumper; used with T872D1375. Q674G1070
G1025 Includes O and B terminals. Q674G1070
G1033 General Electric no. AY28X102. Q674G1070
G1041 Singer no. 02005649; French wording; O-B
jumper.
Q674G1070 Less French wording.
G1066 SLI-Mammoth; heat pump; heat mode
changeover.
Q674G1070 Connect fan (G) wire to Y1 terminal;
B-O and RC-RH jumpers.
Table 7. Q672-Q674 Subbase Cross Reference.
Model Number Description
Q674 Trade
Replacement
a
Remarks
a
When replacing a T872 Thermostat and Q672 Subbase, always replace both the thermostat and subbase.