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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
83 60-2485—8
L1181 113 Used with T874R1129; used in Y594R.
Y594R1243
a
Wirin
g
differences
(
old=new
)
:
X1=X.
L1199 114 Obsolete
. Lennox no. 24F6001; used with T874D1207
and C815A1013.
T8611M2025
(
pro
g
rammable
)
Wirin
g
differences
(
old=new
)
:
V-VR=R, Y=W3, X=C, R=O,
M=Y, M2=Y2-W2, F=G;
j
umper Y2-W2; no outdoor
reset needed; use onl
y
one
s
y
stem transformer.
L1207 115 Used with T874R1152, R1590, R1640, R1921; used in
Y594R1243, R1706.
Q674L1207 or
Y594R1243
a
L1215 116 Obsolete. Crispaire heat pump; used with T874R1111;
used in Y594R1128.
Y594R1243
a
Replacement has auto fan in
emer
g
enc
y
heat mode. Wirin
g
differences
(
old=new
)
: A=L;
set anticipator to 1.2.
L1223 117 Obsolete
. Westin
g
house special. See OEM for
replacement.
L1231 182 Obsolete
. Used with T874R1186 and W89. None
L1249 115 Obsolete
. Used with T874R1194 and W89.
Y594R1243
a
L1256 118 Obsolete. Westin
g
house special; used with
T874W1007.
T8611M2025
(
pro
g
rammable
)
Includes ni
g
ht setback.
L1264 119 Obsolete
. Intertherm heat pump; EM HEAT and SERV
LEDs; used with T874R1202, R1608, R1699; used in
Y594R1185, R1409, R1482.
Y594R1672
a
or
Y594R1763
a
Wirin
g
differences
(
old=new
)
:
W2=W, X=B, Z=no
connection, K=X, W1=H.
L1272 120 Obsolete
. York part no. 025-22290; used with
T874R1046, R1145; used in Y594R1011, R1102; used
with T874R1228, R1251 R1327 and C815A1039; used
in Y594R1144, R1151, R1193.
Y594R1672
a
L1280 233 Obsolete. Lennox no. 52C7601; used with T874W1023
and W89.
Y594W1014
a
L1298 182 Obsolete. Sin
g
er heat pump; used with T874R1160
and W89.
See OEM for
replacement.
L1314 115 Obsolete
. Westin
g
house heat pump; used with
T874R1244 and W89.
Q674L1207 or
Y594R1243
a
L1322 127 Obsolete. EM HEAT and AUX HEAT LEDs; used with
T874C1455.
Y594R1243
a
L1330 120 Obsolete. York heat pump; used with T874R.
Y594R1664
a
Wirin
g
differences
(
old=new
)
:
L=X, X=B.
L1348 115 Obsolete
. Williamson heat pump; used with
T874R1236.
Q674L1207
L1355 111,
190
Obsolete
. Lennox part no. 31F3201; V-VR
j
umper;
used with T874C1448, R1178 and C815A1015.
Y594R1763
a
Wirin
g
differences
(
old=new
)
:
V-VR=R, M=Y, F=G, X=B,
Y=W, A=T, R=O, E=X2.
L1363 129 Obsolete
. York heat pump; EM HEAT LED; used with
T874G1402.
Y594R1425
a
Wirin
g
differences
(
old=new
)
:
W=W2, X=E, B=X;
j
umper Y-
W1.
L1371 124 Obsolete
. BDP heat pump; part no. 34427DP125,
P272-1878; EM HEAT LED; used with T874J1010.
Y594J1001 Wirin
g
differences
(
old=new
)
:
W1=W2, F=L.
L1389 114 Obsolete
. Lennox part no. 41F6501; V-VR
j
umper;
used with T874D1207.
T8611M2025
(
pro
g
rammable
)
Wirin
g
differences
(
old=new
)
:
V-VR=R, Y=W3, X=C, R=O,
M=Y, M2=Y2-W2, F=G;
j
umper Y2-W2; no outdoor
reset needed; use onl
y
one
s
y
stem transformer.
Table 9. Q674 Subbase Cross Reference.
Model
Number
Fig.
No. Description
Q674 Trade
Replacement Remarks
a
Both the thermostat and subbase must be replaced.