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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
41 60-2485—8
E1050 TRADELINE Q674E1049
E1068 RC-RH jumper; used with T872C1699. Q674E1049 RC-RH jumper required.
E1076 RC-RH internal jumper; EM. HT. LED. Q674E1049 RC-RH jumper required.
E1084 Carrier no. HH93AZ076; RC-RH jumper. Q674E1049 RC-RH jumper required.
E1092 Carrier no. HH93AZ082; RC-RH jumper; B
terminal; isolated G terminal.
Q674E1049
E1100 General Electric no. AY28X099. Q674E1049
E1118 Airtemp; heat pump; used with T872D1169. T874D1165/
Q674E1049
Wiring differences (old=new):
A=W1; set H1 anticipator to 1.2A.
E1126 Common R terminal. Q674E1049 RC-RH jumper required.
E1134 ITT Nesbitt; RC-RH jumper; O and B terminals;
isolated G terminal.
Q674E1049
E1142 Lennox no. P-8-11224; heat pump;
V-VR jumper; cool mode changeover; used with
T872G1067.
Y594G1252 Wiring differences (old=new):
V-VR=R, Y=W2, R=O, M=Y, F=G.
E1159 Carrier no. HH93AZ077; RC-RH jumper;
LOCKOUT LED indicates activation of
compressor lockout switch.
Q674E1049 RC-RH jumper required; no LED in
TRADELINE model.
E1167 Square D no. HCB-2; Chek Lite. Q674E1049
E1183 Square D no. HCB-3. Q674E1049
E1191 Lennox; HIGH and LOW LEDs; used with
T872D1045.
Q674E1049 No LEDs on replacement.
Q672F System: EM. HT.-HEAT-AUTO-COOL-OFF
Fan: AUTO-ON.
F1000 With EM. HT. LED; used with T872C1699. Q674F1022 Remove W3-X2 jumper to E-X2.
F1018 Heat pump; heat mode changeover; Chek Lite;
used with T872G1000.
Y594G1252 Wiring differences (old=new):
W=W2, X1=X.
F1026 Chek Lite; W2-X2 jumper. Q674F1022
F1034 Airtemp; EM. HT. LED; RC-RH and X2-E
jumpers.
Q674F1022 If RC-RH jumper removed on
Q672F1034, Q674F1022 does not
replace.
F1042 W2-X2 jumper; Chek Lite. Q674F1022
F1059 Carrier no. HH93AZ074; EM. HT. LED. Q674F1022 Remove W2-X2 jumper to E-X2; X
terminal same as C.
F1067 Lennox; heat pump; cool mode changeover;
EM. HT. LED; used with T872G1026.
None
F1075 Heat pump circuit; EM. HT. LED; 2 terminal; RC-
RH jumper.
None
F1083 Lennox no. P-8-11225; heat pump;
V-VR jumper; cool mode changeover; EM. HT.
LED; used with T872G1067.
None
F1091 Westinghouse; heat pump; EM. HT. LED; cool
mode changeover; compressor lockout in
EM. HT.; used with T872G1034.
Y594G1252 Wiring differences (old=new):
W=W2.
F1109 Airtemp no. 3778567ACC; R-X2 jumper;
EM. HT. LED.
Q674F1022 R-X2 jumper required.
F1117 Tappan no. 080-13708-53; heat pump; EM. HT.
LED; cool mode changeover; compressor
lockout and auto fan in EM. HT.; used with
T872G1109, G1216, G1372.
Y594G1252 Wiring differences (old=new): C=X.
Table 7. Q672-Q674 Subbase Cross Reference.
Model Number Description
Q674 Trade
Replacement
a
Remarks
a
When replacing a T872 Thermostat and Q672 Subbase, always replace both the thermostat and subbase.