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. Y594G1419aWiring 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.
Y594G1252aWiring 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.
Y594G1252aWiring 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).
Y594G1419aE-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.
Y594G1419aE-W2 jumper required.
L1034 203 Obsolete. McQuay logo; part no. 60687201; °F/°C
scaleplate; H1 anticipator factory set at 0.83A; used with
Q674C1280.
Y594G1419aWiring 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.
Y594G1419a 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
aBoth the thermostat and subbase must be replaced.