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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—850
C1216 44 Obsolete. Fasco part no. 1230-8197. T874C1018
C1224 105 Obsolete. S
q
uare D lo
g
o. T874C1018
C1240 44 Hone
y
well lo
g
o; Hone
y
well Canada TRADELINE model;
°C scaleplate; includes Allen wrench and screws to lock
cover.
T874C1018 Replacement has °F
scaleplate.
C1257 44 Obsolete
. Sin
g
er 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
. Sin
g
er 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 Hone
y
well lo
g
o; °C scaleplate; includes Allen wrench
and screws to lock cover; non-ad
j
ustable ran
g
e stops
factor
y
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 lo
g
o. T874C1018
C1315 44 Obsolete. Wesco lo
g
o; heat anticipator factor
y
set at
0.8A.
T874C1018
C1323 44 Obsolete
. Le Chauffa
g
e Urbain special; °C scaleplate. T874C1018 Replacement has °F
scaleplate.
C1331 82, 141 Obsolete
. Duotherm lo
g
o; used with Q674E or Q674F. T874C1018
C1349 61 Obsolete
. Si
g
ler lo
g
o; used with Q674N1023. T874C1018
C1372 52 Obsolete. Hone
y
well lo
g
o; used with Q674B1190. T874C1018/
Q674B1034
For s
y
stems re
q
uirin
g
automatic fan in coolin
g
mode
onl
y
.
T874C1018/
Q674B1075
For s
y
stems re
q
uirin
g
automatic fan in heatin
g
and
coolin
g
.
C1398 105 Obsolete. Fedders lo
g
o; °F/°C scaleplate; used with
Q674L1090.
Y594R1425
a
Wirin
g
differences
(
old=new
)
:
K=E, C=X; replacement has °F
scaleplate.
C1406 105 Obsolete
. Climatrol lo
g
o; °F/°C scaleplate; used with
Q674L1090.
Y594R1425
a
Wirin
g
differences
(
old=new
)
:
K=E, C=X; replacement has °F
scaleplate.
C1414 105 Obsolete
. Airtemp lo
g
o; °F/°C scaleplate; used with
Q674L1090.
Y594R1425
a
Wirin
g
differences
(
old=new
)
:
K=E, C=X; replacement has °F
scaleplate.
C1422 187 Obsolete
. Hone
y
well lo
g
o; used with Q674B1208. None
C1430 49 Obsolete
. Lennox Zone Master Two-Speed lo
g
o; part
no. 25F7201; used with Q674B1224.
T874C1018
C1448 110,
190
Obsolete
. Lennox lo
g
o; part no. 24F5101; meets DoD
specifications; re
q
uires outdoor reset; used with
Q674L1165, L1355.
Y594R1763
a
Wirin
g
differences
(
new=old
)
:
R=V-VR, Y=M, G=F, B-X,
W=Y, T=A, O=R, X2=E;
Emer
g
enc
y
Heat becomes
sta
g
e 1 heat source.
C1455 127 Obsolete
. Williamson lo
g
o; used with Q674L1322.
Y594R1243
a
C1463 82 Obsolete. AAF lo
g
o; °C scaleplate. T874C1018 Replacement has °F
scaleplate.
C1471 56 Obsolete
. Mammoth lo
g
o; 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.