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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
65 60-2485—8
N1040 179 Obsolete. Hone
y
well lo
g
o; H1 and C1 anticipation fixed;
used with Q674F1261; used in Y594N1015.
None
N1057 178 Obsolete
. Intertherm lo
g
o; part no. 9111882; used with
Q674F1220; used in Y594N1023.
T874N1016
N1065 178 Obsolete
. Miller lo
g
o; Nord
y
ne part no. 9122240; used
with Q674F1220; used in Y594N1031.
T874N1016
T874P
Heat pump model; 2-sta
g
e heat, 1-sta
g
e cool, automatic
chan
g
eover in cool.
P1006 57, 78 Obsolete
. McQua
y
lo
g
o; part no. 860-442725B-00; 8°F
(
4.4°C
)
intersta
g
e differential between H1 and H2; used
with Q674B1273, C1140.
None See subbase description for
replacement information.
P1014 78 Obsolete
. Friedrich/Climate Master lo
g
o; °F/°C
scaleplate; 8°F
(
4.4°C
)
differential between H1 and H2
for ni
g
ht setback; used with Q674C1207.
T8600D2028
(
pro
g
rammable
)
Wirin
g
differences
(
old=new
)
:
L=R, W=O; W-Y
j
umper
re
q
uired; includes ni
g
ht
setback.
P1022 97 Obsolete
. Friedrich/Climate Master lo
g
o; part no.
AT5922; °F/°C scaleplate; 8°F
(
4.4°C
)
differential
between H1 and H2 for ni
g
ht setback; used with
Q674C1215.
None See subbase description for
replacement information.
P1030 97 Obsolete
. No lo
g
o; Friedrich part no. AT5930; 8°F
(
4.4°C
)
differential between H1 and H2 for ni
g
ht setback;
used with Q674C1215.
None See subbase description for
replacement information.
P1055 68, 97 Obsolete
. Carrier Heat Pump S
y
stem Control lo
g
o; part
no. HH07AT205; °F/°C scaleplate; heat intersta
g
e
differential 8°F
(
4.4°C
)
.
None See subbase description for
replacement information.
T874Q
1-sta
g
e heat; used with another T874 for ni
g
ht setback.
Q1005 44 Hone
y
well lo
g
o. T874A1036
Q1013 44 Obsolete. Lennox lo
g
o; part no. 13F1201; °F/°C
scaleplate.
T874A1036 Replacement has °F
scaleplate.
Q1021 44 Obsolete
. Lennox lo
g
o; part no. 13F1301; °C scaleplate. T874A1036 Replacement has °F
scaleplate.
T874R
Heat pump model; 2-sta
g
e heat, 1-sta
g
e cool, manual
chan
g
eover.
R1004 47 Obsolete. Hone
y
well lo
g
o; used with Q674B1042; used
in Y594R1029.
Y594R1243
a
Wirin
g
differences
(
old=new
)
:
W1=W2.
R1012 47 Obsolete
. Hone
y
well lo
g
o; Addison heat pump; used
with Q674B1109.
Y594R1243
a
Wirin
g
differences
(
old=new
)
:
W1=W2.
R1020 102 Obsolete
. Lennox lo
g
o; part no. 24F5401; °F/°C
scaleplate; H1 and C1 anticipators are fixed; auxiliar
y
heat circuit powered b
y
separate transformer; used with
Q674L1025.
Y594R1243
a
Wirin
g
differences
(
old=new
)
:
M=Y, F=G, V-VR=R, Y=W2,
R=O; replacement has °F
scaleplate.
R1038 102 Obsolete
. Lennox lo
g
o; °C scaleplate; H1 and C1
anticipators are fixed; auxiliar
y
heat circuit powered b
y
separate transformer; used with Q674L1025.
Y594R1243
a
Wirin
g
differences
(
old=new
)
:
M=Y, F=G, V-VR=R, Y=W2,
R=O; replacement has °F
scaleplate.
R1046 120,
101
Obsolete
. York lo
g
o; part no. 2TH11702224A; H2
anticipator is fixed; used with Q674L1272 in Y594R1011
or with Q674L1094.
Y594R1664
a
R1053 109 Obsolete. Hone
y
well lo
g
o; H2 anticipator is fixed; used
with Q674L1140; used in Y594R1136.
Y594R1763
a
Desi
g
ned for use on Trane
heat pumps.
R1061 104 Obsolete
. Hone
y
well lo
g
o; H2 anticipator is field
ad
j
ustable; chan
g
eover in coolin
g
; used with
Q674L1082.
Y594R1243
a
Replacement has auto fan in
Emer
g
enc
y
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.