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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
43 60-2485—8
G1074 Singer no. 02005754; X1 and X2 terminals for
field-added indicator lights; used with
T872D1375.
None
G1082 Singer no. 02005792; X1 and X2 terminals for
field-added indicator lights; used with
T872D1375.
None
G1090 TRADELINE; B and O terminals. Q674G1070
Q672H System: OFF-ON
Fan: NIGHT INT.-DAY CONT.
H1008 Used with T872. None
Q672J System: EM. HT.-AUTO-OFF
Fan: AUTO-ON.
J1005 With EM. HT. LED; used with T872C or D. None
J1013 Westinghouse; heat pump; EM. HT. LED; cool
mode changeover; compressor lockout in
EM. HT.; used with T872G1034.
Y594G1252
J1021 York; heat pump; EM. HT. LED; cool mode
changeover; compressor lockout and auto fan in
EM. HT.; E-W jumper; used with T872G1042,
G1331, G1398.
Y594G1567
J1039 Heat pump; EM. HT. and AUX. HEAT LEDs;
cool mode changeover; compressor lockout and
auto fan in EM. HT.; used with T872G1059.
Y594G1161 Designed for use on General
Electric heat pumps.
J1047 Singer no. 02005699; heat pump; EM. HT. LED;
heat mode changeover.
Q674F1022
J1054 Carrier no. HH93AZ073A; heat pump; EM. HT.
LED; cool mode changeover; compressor
lockout in EM. HT.; used with T872G1075,
G1182, G1307.
Y594G1252 Wiring differences (old=new): C=X.
J1062 Westinghouse; EM. HT. and AUX. HEAT LEDs;
used with T872G1034.
Y594G1252 Wiring differences (old=new):
W=W2.
Q672K System: OFF-HEAT-AUTO-COOL. Fan: None.
K1004 Carrier no. HH93AZ072. Q674E1049 Fan switch does not function.
K1012 Oneida Heater no. 30A0288-01; System: OFF-
WOOD-WOOD/OIL-OIL; used with T872F1175.
T874F1155/
Q674K1026
Q672L System: EM. HT.-HEAT-OFF-COOL.
Fan: ON-AUTO.
L1003 Lennox; heat pump; EM. HT. LED; cool mode
changeover; used with T872R1024.
Y594R1425
L1011 York; heat pump; EM. HT. LED; cool mode
changeover; compressor lockout and auto fan in
EM. HT.; used with T872R1032, R1180, R1297.
Y594R1664
L1029 Lennox no. P-8-11226; heat pump; EM. HT.
LED; V-VR jumper; cool mode changeover;
compressor lockout in EM. HT.; used with
T872R1040.
Y594R1425 Wiring differences (old=new):
V-VR=R, M=Y, Y=W2, F=G, R=O.
L1037 Heat pump; EM. HT. and AUX. HT. LEDs; cool
mode changeover; compressor lockout and auto
fan in EM. HT.; used with T872R1057.
Y594R1763 Wiring differences (old=new): A=T;
designed for used on General
Electric heat pumps.
L1045 Rheem; heat pump; EM. HT. LED; cool mode
changeover; compressor lockout in EM. HT.;
auto fan in EM. HT; used with T872R1065,
R1081, R1107.
Y594R1243
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.