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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8 50
C1216 44 Obsolete. Fasco part no. 1230-8197. T874C1018
C1224 105 Obsolete. Square D logo. T874C1018
C1240 44 Honeywell logo; Honeywell Canada TRADELINE model;
°C scaleplate; includes Allen wrench and screws to lock
cover.
T874C1018 Replacement has °F
scaleplate.
C1257 44 Obsolete
. Singer part no. 0200-5931; 8°F (4.4°C)
differential between H1 and H2 heat.
T874C1125 Replacement has 12°F
differential between H1 and
H2 heat.
C1265 44 Obsolete. Singer special; °C scaleplate; 5°C (8°F)
differential between H1 and H2 heat.
T874C1125 Replacement has 12°F
differential between H1 and
H2 heat; replacement has °F
scaleplate.
C1273 44 Honeywell logo; °C scaleplate; includes Allen wrench
and screws to lock cover; non-adjustable range stops
factory set at 23°C (max. heat and min. cool) (73°F).
T874C1018 Replacement has °F
scaleplate.
C1281 44 Obsolete
. Heat Wave special. T874C1018
C1307 44 Obsolete
. Friedrich Climate Master logo. T874C1018
C1315 44 Obsolete
. Wesco logo; heat anticipator factory set at
0.8A.
T874C1018
C1323 44 Obsolete
. Le Chauffage Urbain special; °C scaleplate. T874C1018 Replacement has °F
scaleplate.
C1331 82, 141 Obsolete
. Duotherm logo; used with Q674E or Q674F. T874C1018
C1349 61 Obsolete. Sigler logo; used with Q674N1023. T874C1018
C1372 52 Obsolete
. Honeywell logo; used with Q674B1190. T874C1018/
Q674B1034
For systems requiring
automatic fan in cooling mode
only.
T874C1018/
Q674B1075
For systems requiring
automatic fan in heating and
cooling.
C1398 105 Obsolete
. Fedders logo; °F/°C scaleplate; used with
Q674L1090.
Y594R1425
a
Wiring differences (old=new):
K=E, C=X; replacement has °F
scaleplate.
C1406 105 Obsolete
. Climatrol logo; °F/°C scaleplate; used with
Q674L1090.
Y594R1425
a
Wiring differences (old=new):
K=E, C=X; replacement has °F
scaleplate.
C1414 105 Obsolete
. Airtemp logo; °F/°C scaleplate; used with
Q674L1090.
Y594R1425
a
Wiring differences (old=new):
K=E, C=X; replacement has °F
scaleplate.
C1422 187 Obsolete
. Honeywell logo; used with Q674B1208. None
C1430 49 Obsolete
. Lennox Zone Master Two-Speed logo; part
no. 25F7201; used with Q674B1224.
T874C1018
C1448 110,
190
Obsolete
. Lennox logo; part no. 24F5101; meets DoD
specifications; requires outdoor reset; used with
Q674L1165, L1355.
Y594R1763
a
Wiring differences (new=old):
R=V-VR, Y=M, G=F, B-X,
W=Y, T=A, O=R, X2=E;
Emergency Heat becomes
stage 1 heat source.
C1455 127 Obsolete
. Williamson logo; used with Q674L1322.
Y594R1243
a
C1463 82 Obsolete. AAF logo; °C scaleplate. T874C1018 Replacement has °F
scaleplate.
C1471 56 Obsolete
. Mammoth logo; part no. 71120102; used with
Q674B1257; used in Y594C1314.
T874C1018
Table 8. T874 Cross Reference.
Model
Number
Fig.
No. Description
Trade Model
Replacement Remarks
a
Both the thermostat and subbase must be replaced.