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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8 82
K1026 95 System: OFF-WOOD-WOOD/ OIL-OIL; used with
T874F1155.
Q674K1026
K1034 93 Obsolete
. Snyder General part no. 4ELN-7920. Q674E1049 Fan switch is not operational.
K1042 93 Obsolete. Carrier part no. HH93AZ172-W; gray color;
includes removable jumper between RC and RH
terminals.
Q674E1049 Fan switch is not operational.
Q674L System: EM.HT.-HEAT-OFF-COOL; Fan: ON-AUTO
L1017 101 Obsolete
. York heat pump; EM HEAT LED; cooling
mode changeover; compressor lockout; auto fan in
EM.HT; used with T874R1046.
Y594R1243
a
Wiring differences (old=new):
W=W2, X=L, B=X.
L1025 102 Obsolete. Lennox heat pump; part no. 24F6101; EM.
HEAT LED; V-VR jumper; used with T874R1020,
J1038.
Y594R1243
a
Wiring differences (old=new):
M=Y, F=G, V-VR=VR, Y=W2,
R=O.
L1033 115 Obsolete
. Rheem heat pump; EM HEAT LED; used
with T874R1152.
Y594R1243
a
L1041 103 Obsolete. Carrier heat pump; part no. HH93AZ175;
SUPL HEAT LED; used with T874G1055
(HH07AT171), G1071 (HH93AZ175), G1113.
Y594G1419 Wiring differences (old=new):
C=X, jumper Y1=W1.
L1066 122 Obsolete
. Fedders heat pump; used with T874R1269;
used in Y594R1037.
Y594R1615
a
Wiring differences (old=new):
K=E, C=X, W1=B, Z=L.
L1074 124 Obsolete
. Carrier heat pump; part no. HH93AZ186;
SUPL HT LED; used with T874J1002 (HH07AT175) or
T874J1028 (HH07AT165).
Y594J1001
L1082 104 Obsolete. Crispaire heat pump; W2-H jumper; EM
HEAT LED; used with T874R1061, R1111.
Y594R1243
a
Replacement has auto fan in
emergency heat mode.
L1090 105 Obsolete
. Fedders heat pump; EM HEAT LED;
changeover in heat mode; used with T874C1398,
C1406, C1414.
Y594R1425
a
Wiring differences (old=new):
K=E, C=X.
L1108 106 Obsolete
. Westinghouse; EM HEAT LED.
Y594R1243
a
L1116 107 Obsolete. Carrier part no. HH93AZ171; SUPL HEAT
LED; used with T874D1264 (HH07AT173).
See OEM for
replacement.
L1132 108 Heil Quaker part no. HQ711598; used with T874R1137,
R1673, R1731, R1749, R1814; used in Y594R1110,
R1466, R1524, R1532, R1607.
Y594R1292
a
L1140 109 Obsolete. Includes EM HEAT and AUX HEAT LEDs;
used with T874R1053; used in Y594G1136.
Y594R1763
a
Designed for use on Trane
heat pumps.
L1157 115 Obsolete
. Rheem part no. 41-20796-14; EM HEAT and
AUX HEAT LEDs; used with T874R.
Q674L1207
a
121 Obsolete. Used with T874C.
Y594C1322
a
123 Obsolete. Used with T874R.
Y594R1243
a
L1165 110 Obsolete. Lennox no. 24F5901; factory installed V-VR
jumper; EM HEAT and SERVICE LEDs; stage 2 heat is
isolated; used with T874C1448, R1178 and
C815A1013.
Y594R1763
a
Wiring differences (old=new):
V-VR=R, M=Y, F=G, X=B,
Y=W, A=T, R=O, E=X2.
L1173 112 Obsolete
. Westinghouse; AUX HEAT and EM HEAT
LEDs.
Y594R1243
a
L1181 113 Used with T874R1129; used in Y594R.
Y594R1243
a
Wiring differences (old=new):
X1=X.
Table 9. Q674 Subbase Cross Reference.
Model
Number
Fig.
No. Description
Q674 Trade
Replacement Remarks
a
Both the thermostat and subbase must be replaced.