Honeywell T874 - Page 63

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
63 60-2485—8
H1021 74 Obsolete. Friedrich Climate Master logo; part no.
AT5821; °F/°C scaleplate; used with Q674C1041.
Y594H1012
a
Wiring differences (old=new):
Y1=O, Y2=Y; L-R jumper
required; replacement has °F
scaleplate.
H1039 79 Obsolete
. Mammoth logo; °F/°C scaleplate; used with
Q674C1124; used in Y594H1004.
Y594H1012
a
Wiring differences (old=new):
R1=R, R2=L.
H1054 74 Obsolete
. No logo; Friedrich part no. AT5854; used with
Q674C1041.
Y594H1012
a
Wiring differences (old=new):
Y1=O, Y2=Y; L-R jumper
required.
H1062 164 Honeywell logo; used with Q674C1249; used in
Y594H1012.
Y594H1012
a
H1070 172,
173
Obsolete. Carrier Heat Pump System Control logo; part
no. HH07AT166; °C scaleplate; used with Q674B1406
(HH93AZ200) or Q674C1322 (HH93AZ199).
None See subbase description for
replacement information.
H1088 172,
173
Obsolete
. Carrier Heat Pump System Control logo; part
no. HH07AT167; used with Q674B1406 (HH93AZ200)
or Q674C1322 (HH93AZ199).
None See subbase description for
replacement information.
H1096 177 Obsolete
. Mammoth Water Source Heat Pump logo; °F/
°C scaleplate; changeover stage 0.8A maximum; used B
or O terminal; used with Q674C1330.
Y594H1012
a
Wiring differences (old=new):
R1=R, R2=L; L-R jumper
required.
H1112 74 No logo; Friedrich part no. AT5812; used with
Q674C1355.
Y594H1012
a
Wiring differences (old=new):
Y1=O, Y2=Y; L-R jumper
required.
H1120 205 Obsolete
. Command Aire logo; part no. P1013-0055;
used with Q674C1389, C1397.
Y594H1012
a
Wiring differences (old=new):
Y1=O, Y2=Y.
H1138 221 Obsolete
. Climate Master logo; part no. AT5838; used
with Q674C1470.
Y594H1012
a
Wiring differences (old=new):
Y1=O, Y2=Y; replacement has
MALFUNCTION LED only.
H1146 205 Trane logo; part no. X13510598010.
Y594H1012
a
Wiring differences (old=new):
Y1=O, Y2=Y.
H1153 173 Obsolete
. Carrier Heat Pump System Control logo; part
no. HH07AT167; °F/°C scaleplate; used with
Q674C1322; used in Y594H1053.
None See subbase description for
replacement information.
H1161 74 Obsolete. Carrier Heat Pump System Control logo; part
no. HH07AT203; °F/°C scaleplate; used with
Q674C1496; used in Y594H1038.
Y594H1012
a
Wiring differences (old=new):
Y1=O, Y2=Y; L-R jumper
required.
T874J Heat pump model. 2-stage heat, 1-stage cool.
J1002 124,
144,
206,
207
Obsolete
. Carrier Heat Pump System Control logo; part
no. HH07AT175; used with Q674J1068 (HH93AZ183),
Q674J1159 (HH93AZ196), Q674L1074 (HH93AZ186),
Q674L1637 (HH93AZ195).
None See subbase description for
replacement information.
J1010 124,
171
Obsolete
. BDP multi logo; part no. 34427DP124/P272-
2471; used with Q674J1084, L1371.
None See subbase description for
replacement information.
J1028 124,
144,
206,
207
Obsolete
. Carrier Heat Pump System Control logo; part
no. HH07AT165; °C scaleplate; used with Q674J1068
(HH93AZ183), Q674J1159 (HH93AZ196), Q674L1074
(HH93AZ186), Q674L1637 (HH93AZ195).
None See subbase description for
replacement information.
J1036 124,
171
Obsolete
. Miller logo; part no. 9132230; used with
Q674J1217.
T8511G1021
J1044 124,
171
Obsolete
. Intertherm logo; part no. 9132240; used with
Q674J1217.
T8511G1021
J1051 124,
144
Obsolete
. Carrier logo; part no. HH07AT165-W; Premier
White® color; °C scaleplate.
None See subbase description for
replacement information.
Table 8. T874 Cross Reference.
Model
Number
Fig.
No. Description
Trade Model
Replacement Remarks
a
Both the thermostat and subbase must be replaced.