T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—882
Q674K S
y
stem: OFF-HEAT-AUTO-COOL; Fan: None
K1000 93 Obsolete. Carrier part no. HH93AZ172; RC-RH
j
umper. Q674E1049 Fan switch is not operational.
K1018 95 Obsolete. Oneida Heater part no. 3040284-02;
S
y
stem: OFF-WOOD-WOOD/OIL-OIL; used with
T874F1106.
Q674K1026
K1026 95 S
y
stem: OFF-WOOD-WOOD/ OIL-OIL; used with
T874F1155. Q674K1026
K1034 93 Obsolete. Sn
y
der General part no. 4ELN-7920. Q674E1049 Fan switch is not operational.
K1042 93 Obsolete. Carrier part no. HH93AZ172-W;
g
ra
y
color;
includes removable
j
umper between RC and RH
terminals.
Q674E1049 Fan switch is not operational.
Q674L S
y
stem: EM.HT.-HEAT-OFF-COOL; Fan: ON-AUTO
L1017 101 Obsolete. York heat pump; EM HEAT LED; coolin
g
mode chan
g
eover; compressor lockout; auto fan in
EM.HT; used with T874R1046.
Y594R1243aWirin
g
differences
(
old=new
)
:
W=W2, X=L, B=X.
L1025 102 Obsolete. Lennox heat pump; part no. 24F6101; EM.
HEAT LED; V-VR
j
umper; used with T874R1020,
J1038.
Y594R1243aWirin
g
differences
(
old=new
)
:
M=Y, F=G, V-VR=VR, Y=W2,
R=O.
L1033 115 Obsolete. Rheem heat pump; EM HEAT LED; used
with T874R1152. Y594R1243a
L1041 103 Obsolete. Carrier heat pump; part no. HH93AZ175;
SUPL HEAT LED; used with T874G1055
(
HH07AT171
)
, G1071
(
HH93AZ175
)
, G1113.
Y594G1419 Wirin
g
differences
(
old=new
)
:
C=X,
j
umper Y1=W1.
L1066 122 Obsolete. Fedders heat pump; used with T874R1269;
used in Y594R1037. Y594R1615aWirin
g
differences
(
old=new
)
:
K=E, C=X, W1=B, Z=L.
L1074 124 Obsolete. Carrier heat pump; part no. HH93AZ186;
SUPL HT LED; used with T874J1002
(
HH07AT175
)
or
T874J1028
(
HH07AT165
)
.
Y594J1001
L1082 104 Obsolete. Crispaire heat pump; W2-H
j
umper; EM
HEAT L ED; u sed w ith T874 R106 1, R1111 . Y594R1243aReplacement has auto fan in
emer
g
enc
y
heat mode.
L1090 105 Obsolete. Fedders heat pump; EM HEAT LED;
chan
g
eover in heat mode; used with T874C1398,
C1406, C1414.
Y594R1425aWirin
g
differences
(
old=new
)
:
K=E, C=X.
L1108 106 Obsolete. Westin
g
house; EM HEAT LED. Y594R1243a
L1116 107 Obsolete. Carrier part no. HH93AZ171; SUPL HEAT
LED; used with T874D1264
(
HH07AT173
)
.See OEM for
replacement.
L1132 108 Heil Quaker part no. HQ711598; used with T874R1137,
R1673, R1731, R1749, R1814; used in Y594R1110,
R1466, R1524, R1532, R1607.
Y594R1292a
L1140 109 Obsolete. Includes EM HEAT and AUX HEAT LEDs;
used with T874R1053; used in Y594G1136. Y594R1763aDesi
g
ned for use on Trane
heat pumps.
L1157 115 Obsolete. Rheem part no. 41-20796-14; EM HEAT and
AUX HEAT LEDs; used with T874R. Q674L1207a
121 Obsolete. Used with T874C. Y594C1322a
123 Obsolete. Used with T874R. Y594R1243a
L1165 110 Obsolete. Lennox no. 24F5901; factor
y
installed V-VR
j
umper; EM HEAT and SERVICE LEDs; sta
g
e 2 heat is
isolated; used with T874C1448, R1178 and
C815A1013.
Y594R1763aWirin
g
differences
(
old=new
)
:
V-VR=R, M=Y, F=G, X=B,
Y=W, A=T, R=O, E=X2.
L1173 112 Obsolete. Westin
g
house; AUX HEAT and EM HEAT
LEDs. Y594R1243a
Table 9. Q674 Subbase Cross Reference.
Model
Number Fig.
No. Description Q674 Trade
Replacement Remarks
aBoth the thermostat and subbase must be repl aced.