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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.