Honeywell T874 Product Data page 40

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
Model Number
B1269 Whalen; Hi-Lo fan switch; constant fan in heat
and cool system switch positions; used with
T872C1574.
B1277 Square D no. HCB-5.
B1285 Wards; RC-RH and F-W3 jumpers; used with
T872C1673.
B1293 Lennox no. 41C96; used with T872C1673.
Q672C System: OFF-AUTO, Fan: AUTO-ON
C1003 Standard OEM
C1011 Westinghouse; RC-RH jumper.
C1029 W1-Y2 jumper; for heat pump; used with
T872D1136.
C1037 Chrysler Airtemp; System: COOL-OFF-AUTO.
C1045 Westinghouse; heat pump; used with
T872S1005.
C1052 Isolated stage 2 heat circuit for dc electric heat
relay.
C1060 Fedders special.
C1078 General Electric no. AY28X109.
C1086 Command-Aire; heat pump; used with
T872H1009.
C1102 TRADELINE
Q672D System: None. Fan: None.
D1002 Standard OEM; used with T872F1126.
D1010 Lennox special.
D1028 Carrier; RC-RH jumper.
D1036 Carrier no. HH93AZ070; RC-RH jumper.
D1044 General Electric no. AY-28X100.
D1069 Square D no. HCB-4.
D1077 York; used with T872G1364.
D1085 TRADELINE
Q672E System: OFF-HEAT-AUTO-COOL
Fan: AUTO-ON
E1001 Standard OEM
E1019 Lennox no. P-8-8892; heat pump; cool mode
changeover; used with T872G1026.
E1027 Heat pump circuit; W1-Y2 jumper; cool mode
changeover; used with T872G1018.
E1035 Heat pump circuit; W1-Y2 jumper; cool mode
changeover.
E1043 Heat pump circuit; heat mode changeover.
a
When replacing a T872 Thermostat and Q672 Subbase, always replace both the thermostat and subbase.
60-2485—8
Table 7. Q672-Q674 Subbase Cross Reference.
Description
40
Q674 Trade
Replacement a
None
Q674B1034
Gas Furnace:
T874C1018/
Q674B1034
Electric Furnace: Adjust anticipator faster for correct
T874C1018/ performance.
Q674B1075
Same as
Q672B1285
Q674C1058
Q674C1058 RC-RH jumper required.
Q674E1049 Replacement has heat/cool system
switching.
Q674C1058
T874C1018/ Wiring differences (old=new):
Q674C1058 V=RC-RH, F=G, C=Y1, Z=B,
H2=W2; W1-Y1 jumper required.
Recontrol Use T874G1246/Q674F1212 which
adds HEAT-COOL-EM.HT. system
switch.
Q674C1058
Q674C1058
Y594H1012
Q674C1058
Q674D1040
None
None
Q674D1040 RC-RH jumper required.
None
None
None
Q674D1040
Q674E1049
T874D1165/
Q674B1075
Y594G1393 Wiring differences (old=new): Y1=O,
Y2=Y.
Y594G1393 Wiring differences (old=new): Y1=O,
Y2=Y.
Q674E1049 Wiring differences (old=new):
W1=B, W2=W1; W1-Y1 jumper.
Remarks