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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8 64
J1069 124,
144,
206,
207
Obsolete. Honeywell logo; TRADELINE model; used
with Q674J1282; used in Y594J1019.
T8511G1021
J1077 124,
171
Obsolete
. Nordyne logo; part no. 9148300; °F/°C
scaleplate.
T8511G1021
T874K Heat pump model; 2-stage heat, 1-stage cool, automatic
changeover in heat.
K1001 77 Obsolete
. LSI Mammoth logo; used with Q674C1090.
Y594G1419
a
Wiring differences (old=new):
RH-RC=R, W1=B, W3=W2,
W2=W1; remove Y1-W1
jumper.
K1019 181 Obsolete
. McQuay/Snyder General logo; part no.
60687301; °F/°C scaleplate; H1 anticipator set at 0.83A;
8°F interstage differential between H1 and H2 for night
setback; used with Q674C1280.
Y594G1252
a
Wiring differences (old=new):
C=X, W=B, A=L; jumper
E-W2; no night setback.
T8611G1004
(programmable)
Wiring differences (old=new):
C=X, W=B, A=X2; jumper X2-
R; remove external time clock;
includes night setback.
K1027 181 Obsolete
. AAF/Snyder General logo; part no.
066804403; °F/°C scaleplate; H1 anticipator set at
0.83A; 8°F interstage differential between H1 and H2 for
night setback; used with Q674C1280.
Y594G1252
a
Wiring differences (old=new):
C=X, W=B, A=L; jumper
E-W2; no night setback.
T8611G1004
(programmable)
Wiring differences (old=new):
C=X, W=B, A=X2; jumper
X2-R; remove external time
clock; includes night setback.
T874L Heat pump model; 2-stage heat, 1-stage cool,
changeover in cool.
L1000 198 Obsolete
. Carrier logo; part no. HH07AT176; used with
Q674E1270 (HH93AZ189).
Y594G1419
a
E-W2 jumper required.
L1018 138,
165
Obsolete
. Carrier Multiplex System logo; part no.
HH07AT178; used with Q674B1356 (HH93AZ192) or
Q674C1264 (HH93AZ193).
See OEM for
replacement.
L1026 198 Obsolete
. Honeywell logo; BDP part no. P272-2786;
used with Q674E1304.
Y594G1419
a
E-W2 jumper required.
L1034 203 Obsolete
. McQuay logo; part no. 60687201; °F/°C
scaleplate; H1 anticipator factory set at 0.83A; used with
Q674C1280.
Y594G1419
a
Wiring differences (old=new):
Y=Y1, W=B, A=X1; remove
Y1-W1 jumper.
L1059 215,
213
Obsolete
. Carrier logo; part no. HH07AT192; used with
Q674B1448 (HH93A2202) or Q674C1413
(HH93AZ204).
See OEM for
replacement.
L1067 203 Obsolete
. AAF/Snyder General logo; part no.
066804402; H1 anticipator factory set at 0.83A; used
with Q674C1280.
Y594G1419
a
Wiring differences (old=new):
Y=Y1, W=B, A=X1; remove
Y1-W1 jumper.
L1075 203 Obsolete
. McQuay logo; part no. 073318601; Premier
White® color; °F/°C scaleplate; includes AAF insert.
See OEM for
replacement.
T874N Heat pump model; 2-stage heat; 1-stage cool plus
changeover; changeover in heat mode.
N1008 178 Obsolete
. Williamson logo; used with Q674F1196; used
in Y594N1007.
T874N1016
N1016 178 Honeywell Heat Pump Thermostat logo; used with
Q674F1220.
T874N1016
N1024 179,
217
Bard logo; H1 and C1 anticipation fixed; used with
Q674F1261.
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.