Honeywell T874 - page 83

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
83 60-2485—8
L1199 114 Obsolete. Lennox no. 24F6001; used with T874D1207
and C815A1013.
T8611M2025
(programmable)
Wiring differences (old=new):
V-VR=R, Y=W3, X=C, R=O,
M=Y, M2=Y2-W2, F=G;
jumper Y2-W2; no outdoor
reset needed; use only one
system transformer.
L1207 115 Used with T874R1152, R1590, R1640, R1921; used in
Y594R1243, R1706.
Q674L1207 or
Y594R1243a
L1215 116 Obsolete. Crispaire heat pump; used with T874R1111;
used in Y594R1128.
Y594R1243aReplacement has auto fan in
emergency heat mode. Wiring
differences (old=new): A=L;
set anticipator to 1.2.
L1223 117 Obsolete. Westinghouse special. See OEM for
replacement.
L1231 182 Obsolete. Used with T874R1186 and W89. None
L1249 115 Obsolete. Used with T874R1194 and W89. Y594R1243a
L1256 118 Obsolete. Westinghouse special; used with
T874W1007.
T8611M2025
(programmable)
Includes night setback.
L1264 119 Obsolete. Intertherm heat pump; EM HEAT and SERV
LEDs; used with T874R1202, R1608, R1699; used in
Y594R1185, R1409, R1482.
Y594R1672a or
Y594R1763a
Wiring 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.
Y594R1672a
L1280 233 Obsolete. Lennox no. 52C7601; used with T874W1023
and W89.
Y594W1014a
L1298 182 Obsolete. Singer heat pump; used with T874R1160
and W89.
See OEM for
replacement.
L1314 115 Obsolete. Westinghouse heat pump; used with
T874R1244 and W89.
Q674L1207 or
Y594R1243a
L1322 127 Obsolete. EM HEAT and AUX HEAT LEDs; used with
T874C1455.
Y594R1243a
L1330 120 Obsolete. York heat pump; used with T874R. Y594R1664aWiring 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 jumper;
used with T874C1448, R1178 and C815A1015.
Y594R1763aWiring 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.
Y594R1425aWiring differences (old=new):
W=W2, X=E, B=X; jumper Y-
W1.
L1371 124 Obsolete. BDP heat pump; part no. 34427DP125,
P272-1878; EM HEAT LED; used with T874J1010.
Y594J1001 Wiring differences (old=new):
W1=W2, F=L.
L1389 114 Obsolete. Lennox part no. 41F6501; V-VR jumper;
used with T874D1207.
T8611M2025
(programmable)
Wiring differences (old=new):
V-VR=R, Y=W3, X=C, R=O,
M=Y, M2=Y2-W2, F=G;
jumper Y2-W2; no outdoor
reset needed; use only one
system transformer.
L1397 103 Obsolete. Carrier part no. HH93AZ185A; SUPL HEAT
LED.
Y594G1393aWiring differences (old=new):
C=X.
Table 9. Q674 Subbase Cross Reference.
Model
Number
Fig.
No. Description
Q674 Trade
Replacement Remarks
aBoth the thermostat and subbase must be replaced.