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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
65 60-2485—8
N1040 179 Obsolete. Honeywell logo; H1 and C1 anticipation fixed;
used with Q674F1261; used in Y594N1015.
None
N1057 178 Obsolete
. Intertherm logo; part no. 9111882; used with
Q674F1220; used in Y594N1023.
T874N1016
N1065 178 Obsolete
. Miller logo; Nordyne part no. 9122240; used
with Q674F1220; used in Y594N1031.
T874N1016
T874P Heat pump model; 2-stage heat, 1-stage cool, automatic
changeover in cool.
P1006 57, 78 Obsolete
. McQuay logo; part no. 860-442725B-00; 8°F
(4.4°C) interstage differential between H1 and H2; used
with Q674B1273, C1140.
None See subbase description for
replacement information.
P1014 78 Obsolete
. Friedrich/Climate Master logo; °F/°C
scaleplate; 8°F (4.4°C) differential between H1 and H2
for night setback; used with Q674C1207.
T8600D2028
(programmable)
Wiring differences (old=new):
L=R, W=O; W-Y jumper
required; includes night
setback.
P1022 97 Obsolete
. Friedrich/Climate Master logo; part no.
AT5922; °F/°C scaleplate; 8°F (4.4°C) differential
between H1 and H2 for night setback; used with
Q674C1215.
None See subbase description for
replacement information.
P1030 97 Obsolete
. No logo; Friedrich part no. AT5930; 8°F
(4.4°C) differential between H1 and H2 for night setback;
used with Q674C1215.
None See subbase description for
replacement information.
P1055 68, 97 Obsolete. Carrier Heat Pump System Control logo; part
no. HH07AT205; °F/°C scaleplate; heat interstage
differential 8°F (4.4°C).
None See subbase description for
replacement information.
T874Q 1-stage heat; used with another T874 for night setback.
Q1005 44 Honeywell logo. T874A1036
Q1013 44 Obsolete
. Lennox logo; part no. 13F1201; °F/°C
scaleplate.
T874A1036 Replacement has °F
scaleplate.
Q1021 44 Obsolete
. Lennox logo; part no. 13F1301; °C scaleplate. T874A1036 Replacement has °F
scaleplate.
T874R Heat pump model; 2-stage heat, 1-stage cool, manual
changeover.
R1004 47 Obsolete
. Honeywell logo; used with Q674B1042; used
in Y594R1029.
Y594R1243
a
Wiring differences (old=new):
W1=W2.
R1012 47 Obsolete
. Honeywell logo; Addison heat pump; used
with Q674B1109.
Y594R1243
a
Wiring differences (old=new):
W1=W2.
R1020 102 Obsolete
. Lennox logo; part no. 24F5401; °F/°C
scaleplate; H1 and C1 anticipators are fixed; auxiliary
heat circuit powered by separate transformer; used with
Q674L1025.
Y594R1243
a
Wiring differences (old=new):
M=Y, F=G, V-VR=R, Y=W2,
R=O; replacement has °F
scaleplate.
R1038 102 Obsolete
. Lennox logo; °C scaleplate; H1 and C1
anticipators are fixed; auxiliary heat circuit powered by
separate transformer; used with Q674L1025.
Y594R1243
a
Wiring differences (old=new):
M=Y, F=G, V-VR=R, Y=W2,
R=O; replacement has °F
scaleplate.
R1046 120,
101
Obsolete
. York logo; part no. 2TH11702224A; H2
anticipator is fixed; used with Q674L1272 in Y594R1011
or with Q674L1094.
Y594R1664
a
R1053 109 Obsolete. Honeywell logo; H2 anticipator is fixed; used
with Q674L1140; used in Y594R1136.
Y594R1763
a
Designed for use on Trane
heat pumps.
R1061 104 Obsolete
. Honeywell logo; H2 anticipator is field
adjustable; changeover in cooling; used with
Q674L1082.
Y594R1243
a
Replacement has auto fan in
Emergency Heat mode.
Table 8. T874 Cross Reference.
Model
Number
Fig.
No. Description
Trade Model
Replacement Remarks
a
Both the thermostat and subbase must be replaced.