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 4 7 Obsolete. Honeywell logo; used with Q674B1042; used
in Y594R1029.
Y594R1243aWiring differences (old=new):
W1=W2.
R1012 4 7 Obsolete. Honeywell logo; Addison heat pump; used
with Q674B1109.
Y594R1243aWiring 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.
Y594R1243a 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.
Y594R1243aWiring 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.
Y594R1664a
R1053 109 Obsolete. Honeywell logo; H2 anticipator is fixed; used
with Q674L1140; used in Y594R1136.
Y594R1763aDesigned for use on Trane
heat pumps.
R1061 104 Obsolete. Honeywell logo; H2 anticipator is field
adjustable; changeover in cooling; used with
Q674L1082.
Y594R1243aReplacement has auto fan in
Emergency Heat mode.
Table 8. T874 Cross Reference.
Model
Number
Fig.
No. Description
Trade Model
Replacement Remarks
aBoth the thermostat and subbase must be replaced.