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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8 84
L1405 106 Obsolete. BDP heat pump; part no. HH641501; used
with T874R1335; used in Y594R1201.
Y594R1243
a
L1413 133 Obsolete. Fedders heat pump; used with T874R1343;
used in Y594R1219.
Y594R1425
a
Wiring differences (old=new):
K=E, C=X, Z=L; remove
W1-Y jumper.
L1421 125 Obsolete
. Coleman heat pump; used with T874R1368;
used in Y594R1235.
Y594R1797
a
L1439 131 Obsolete. Carrier part no. HH93AZ187; SUPL HEAT
LED; System: SUPL HT-HEAT- COOL; used with
T874R1384 (HH07AQ170).
Q674L1207 or
Y594G1393
a
Wiring differences (old=new):
C=X.
L1447 128 Obsolete. Williamson heat pump; three LEDs; used
with T874R1392; used in Y594R1250.
Y594R1425
a
Wiring differences (old=new):
A=L.
L1454 131 Obsolete
. Carrier part no. HH93AZ197; SUPL HEAT
LED; used with T874R1384 (HH07AQ170).
Y594R1393
a
Wiring differences (old=new):
C=X.
L1462 113 Obsolete
. LSI heat pump; part no. 104710002; used
with T874R1400.
Y594R1243
a
Wiring differences (old=new):
X1=X.
L1496 136 Obsolete
. Trane heat pump; used with T874R1426;
used in Y594R1284.
Y594R1763
a
L1504 134 Rheem part no. 41-20796-24; used with T874R1442,
R1434, R1459; used in Y594R1631, R1649, R1854.
Y594R1300
a
L1512 108 Includes two LEDs; used with T874R1467; used in
Y594R1292.
Y594R1292
a
L1520 123 Includes EM HEAT and AUX HEAT LEDs; used with
T874R1475; used in Y594R1300.
Y594R1300
a
L1538 130 Obsolete. Snyder General heat pump; used with
T874R1483, R1517, R1566 and C815A1005; used in
Y594R1318, R1342, R1375.
Y594R1763
a
Wiring differences (old=new):
C=B, W1=W, E=X2, X=F.
132 Obsolete. Used with T874R1574, R1582; used in
Y594R1383, R1391.
Y594R1243
a
Wiring differences (old=new):
C=X, X=L, W=W2.
L1546 140 Obsolete
. Rheem part no. 41-20797-21; three LEDs;
used with T874W1031 and C815A1005; used in
Y594W1022.
T8611M2025
(programmable)
Includes night setback.
L1553 137 Obsolete
. Includes three LEDs; used with T874R1491;
used in Y594R1326.
Y594R1615
a
L1561 121 Obsolete. Used with T874C1638; used in Y594C1322.
Y594C1322
a
Use Y594C1322 when T874C
is used.
123 Obsolete
. Used with T874R.
Y594R1243
a
Use Y594R1243 when T874R
is used.
L1579 135 Obsolete
. Carrier heat pump; part no. HH93AZ198;
SUPL HEAT LED; used with T874R1384
(HH07AQ170).
Y594R1243
a
Wiring differences (old=new):
C=X.
L1587 168 Used with T874R1616; used in Y594R1425.
Y594R1425
a
L1595 200,
201
Obsolete. Miller heat pump; used with T874R1624 or
T874R1202; used in Y594R1433.
Y594R1243
a
or
Y594R1763
a
L1603 134 Obsolete. Used with T874R1632.
Y594R1243
a
L1611 136 Obsolete. American Standard heat pump; part no.
WY28X235; used with T874R1657; used in
Y594R1441.
Y594R1763
a
L1637 207 Obsolete. Carrier heat pump; part no. HH93AZ195;
used with T874J1002 (HH07AT175) or T874J1010
(HH07AT165).
Y594J1001
a
Table 9. Q674 Subbase Cross Reference.
Model
Number
Fig.
No. Description
Q674 Trade
Replacement Remarks
a
Both the thermostat and subbase must be replaced.