Honeywell T874 - Page 44

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
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L1052 Carrier no. HH93AZ075; heat pump; EM. HT.
LED; cool mode changeover; compressor
lockout in EM. HT.; used with T872G1075,
G1182, G1273, G1307.
Y594R1615 Wiring differences (old=new): C=X.
L1060 Dunham Bush; EM. HT. LED; used with
T872R1099.
Y594R1243
L1078 Tappan no. B13708-58; heat pump; EM. HT.
LED; cool mode changeover; compressor
lockout in EM. HT.; EM. HT. relay provides fan
operation in EM. HT.; used with T872G1190.
None
L1086 Friedrich; heat mode changeover; EM. HT. LED;
used T872R1115 with L terminal.
Y594R1243 Wiring differences (old=new): X2=E,
C=X.
L1094 Crispaire; W2-H jumper; EM. HT. LED; used
with T872R1065, R1156.
Y594R1243 Replacement has auto fan in
Emergency Heat mode.
L1102 Fedders; heat mode changeover; EM. HT. LED;
used with T872C1509, C1517, C1541.
Y594R1425 Wiring differences (old=new): K=E,
C=X; remove Y-W1 jumper.
L1110 Westinghouse; EM. HT. LED; used with
T872R1149.
Y594R1243 Wiring differences (old=new):
W=W2.
L1128 Westinghouse; EM. HT. LED; used with
T872R1149.
Y594R1243 Wiring differences (old=new):
W=W2.
L1136 Rheem no. 41-20796-07; cool mode
changeover; EM. HT. and AUX. HT. LEDs; used
with T872R1081, T872R1107.
Y594R1243
L1144 Lennox; V-VR jumper; EM. HT. and SERVICE
LEDs; isolated stage 2 heat; used with
T872R1131, C815A1013.
None
L1151 Westinghouse; AUX. HT. and EM. HT. LEDs;
used with T872R1149.
Y594R1243 Wiring differences (old=new):
W=W2.
L1169 Carrier no. HH93AZ071; EM. HT. LED; used
with T872G1257 (HH07AT073).
None
L1177 York; DoD; EM. HT. LED; used with T872G1299. Y594G1567
L1185 Bard; used with T872R1164. Y594R1243
L1193 Heil Quaker no. NAXA001TS01; used with
T872R1172.
Y594R1243 Wiring differences (old=new): B=X,
W=W2.
L1201 Lennox special; no. 1485701; used with
T872G1323.
None
L1219 Westinghouse special; used with T872G1356. T874D1165/
Q674F1022
Wiring differences (old=new): X=X1,
L=X2, W=E; Y1-W1 and
Y2-W2 jumpers required.
L1227 Heat pump; used with T872R1198. Y594R1243
L1235 Intertherm; used with T872R1206, R1305. None
L1250 Crispaire special; used with T872R1156 and
C815A1021.
Y594R1243
L1268 Westinghouse special; used with T872W1027
and C815A1021.
None
L1276 Intertherm special; used with T872R1214. Y594R1300 Wiring differences (old=new):
W1=B, Z=L, K=E.
L1284 York special; used with T872R1222. Y594R1672
L1300 Amana special; no. C62345-1; used with
T872R1230.
None
L1326 Singer; used with T872R1255. None
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.