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