T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—880
F1667 155 WaterFurnace lo
g
o; part no. TA21H03; S
y
stem: OFF-
AUTO-HEAT-EM HT; includes two LEDs; used with
T874G2046.
Y594G1716
F1675 248 Obsolete. WaterFurnace lo
g
o; part no. TA21H03;
includes four LEDs. See OEM for
replacement.
Q674G S
y
stem: 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. Sin
g
er part no. 0200-5963; used with
T874D1298. See OEM for
replacement.
G1062 232 Obsolete. Sin
g
er; 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. McQua
y
part no. 0200-5963; two LEDs;
used with T874D1116. See OEM for
replacement.
G1120 202,
226 Obsolete. McQua
y
part no. 60684701; two SERVICE
LEDs; no fan switchin
g
; 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 Gra
y
color. Q674G1070 Replacement is bei
g
e color.
G1179 202 Obsolete. McQua
y
lo
g
o; part no. 073319601; includes
two LEDs. Q674G1161 Replacement has no LEDs.
Q674J S
y
stem: EM.HT.-AUTO-OFF; Fan: AUTO-ON
J1001 180 Obsolete. Sin
g
er heat pump part no. 02005964; EM
HEAT LED; chan
g
eover heat mode. See OEM for
replacement.
J1019 159 Obsolete. Westin
g
house heat pump; EM HT LED;
S
y
stem: EM.HT.-ON-OFF; used with T874G1048. Y594G1252aWirin
g
differences
(
old=new
)
:
W=W2.
J1027 160 Obsolete. York part no. 025-22291; EM HEAT LED;
auto fan in emer
g
enc
y
heat mode; chan
g
eover in cool
mode; used with T874G1170, G1196, G1428, G1345,
G1444; used in Y594G1013, G1138, G1229.
Y594G1567a
J1035 161 Carrier h eat pump; part no. HH93AZ173; S
y
stem:
SUPL.HT.-ON-OFF; SUPL HEAT LED; used with
T874G1055
(
HH07AT171
)
.
Y594G1674a
J1043 162 TRADELINE heat pump model; desi
g
ned for use on
Trane heat pumps; AUX HT and EM HT LEDs; auto fan
in emer
g
enc
y
heat; chan
g
eover in coolin
g
mode; used
with T874G1204 and C815A1008; used in Y594G1161.
Q674J1043 or
Y594G1161a
Desi
g
ned for use on Trane
heat pumps.
J1050 183 Obsolete. Westin
g
house heat pump; EM HEAT and
AUX HEAT LEDs; used with T874G1071. Y594G1674a
Table 9. Q674 Subbase Cross Reference.
Model
Number Fig.
No. Description Q674 Trade
Replacement Remarks
aBoth the thermostat and subbase must be repl aced.