T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8 80
F1675 248 Obsolete. WaterFurnace logo; part no. TA21H03;
includes four LEDs.
See OEM for
replacement.
Q674G System: OFF-AUTO; Fan: None
G1005 184 Obsolete. Used in Y594F1063. Q674G1070
G1013 186 Obsolete. Climate Control; used with T874D1298. See OEM for
replacement.
G1021 91 Obsolete. Includes O and B terminals; used with
T874A-F,Q or T874D1082; used in Y594D1032.
Q674G1070
G1047 92 Obsolete. Used with T874C1018, C1125. T8611
G1054 188 Obsolete. Singer part no. 0200-5963; used with
T874D1298.
See OEM for
replacement.
G1062 232 Obsolete. Singer; used with T874D1298. See OEM for
replacement.
G1070 91 TRADELINE Q674G1070
G1088 92 Obsolete. LSI-Mammoth part no. 71120201; used with
T874C.
See OEM for
replacement.
G1096 90 Obsolete. Climate Control part no. 02005958; used
with T874D1439, D1447.
See OEM for
replacement.
G1104 94 Obsolete. McQuay part no. 0200-5963; two LEDs;
used with T874D1116.
See OEM for
replacement.
G1120 202,
226
Obsolete. McQuay part no. 60684701; two SERVICE
LEDs; no fan switching; used with T874D1694, G1926.
See OEM for
replacement.
G1138 91 Obsolete. Trane part no. BAS-0433; used with T874A-F. Q674G1070
G1153 184 Obsolete. Carrier part no. HH93AZ212; used in
Y594D1396.
Q674G1070
G1161 184 Gray color. Q674G1070 Replacement is beige color.
G1179 202 Obsolete. McQuay logo; part no. 073319601; includes
two LEDs.
Q674G1161 Replacement has no LEDs.
Q674J System: EM.HT.-AUTO-OFF; Fan: AUTO-ON
J1001 180 Obsolete. Singer heat pump part no. 02005964; EM
HEAT LED; changeover heat mode.
See OEM for
replacement.
J1019 159 Obsolete. Westinghouse heat pump; EM HT LED;
System: EM.HT.-ON-OFF; used with T874G1048.
Y594G1252aWiring differences (old=new):
W=W2.
J1027 160 Obsolete. York part no. 025-22291; EM HEAT LED;
auto fan in emergency heat mode; changeover in cool
mode; used with T874G1170, G1196, G1428, G1345,
G1444; used in Y594G1013, G1138, G1229.
Y594G1567a
J1035 161 Carrier heat pump; part no. HH93AZ173; System:
SUPL.HT.-ON-OFF; SUPL HEAT LED; used with
T874G1055 (HH07AT171).
Y594G1674a
J1043 162 TRADELINE heat pump model; designed for use on
Trane heat pumps; AUX HT and EM HT LEDs; auto fan
in emergency heat; changeover in cooling mode; used
with T874G1204 and C815A1008; used in Y594G1161.
Q674J1043 or
Y594G1161a
Designed for use on Trane
heat pumps.
J1050 183 Obsolete. Westinghouse heat pump; EM HEAT and
AUX HEAT LEDs; used with T874G1071.
Y594G1674a
J1068 144 Obsolete. Carrier heat pump; part no. HH93AZ183;
used with T874J1002 (HH07AT175) or T874J1028
(HH07AT165).
Y594J1019
J1076 180 Obsolete. McQuay part no. 02005964; two LEDs; used
with T874A,D.
Q674F1022 Replacement has no LEDs.
Table 9. Q674 Subbase Cross Reference.
Model
Number
Fig.
No. Description
Q674 Trade
Replacement Remarks
aBoth the thermostat and subbase must be replaced.