T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
91 60-2485—8
G1617 73 Obsolete. Carrier part no. 50QE90020101; contains
T874G1949 and Q674C1504.
Y594H1012aWiring differences (old=new):
Y1=O, Y2=Y, L=R, R=none;
R-L jumper required; no night
setback.
T8600D2028
(programmable)
Wiring differences (old=new):
Y1=O, Y2=Y, L=R; W-Y jumper
required; night setback.
G1625 160 York Canada part no. 2TH11702524; contains
T874G1964 and Q674J1266.
Y594G1567aReplacement has °F
scaleplate.
G1633 169 TRADELINE; contains T874G1972 and
Q674F1584; direct replacement for Y594G1377
(T874G1576/Q674F1402) Evcon/Coleman part no.
3600-373.
Y594G1633a
G1641 169 Obsolete. Amana part no. 10636703; contains
T874G1980 and Q674F1600.
Y594G1633 Wiring differences (old=new):
W3=W2.
G1658 155 Obsolete. Tempstar “Inter-City Products” part no.
1149910; contains T874G1998 and Q674F1212.
Y594G1252
G1666 103 Obsolete. TRADELINE; manual changeover;
contains T874G2004 and Q674L1892; direct
replacement for Y507J1011 (T874G1055/
Q674L1041) Carrier part no. 99TZ90041106
(HH07AT171/HH93AZ1750).
Y594G1674 Replacement has auto
changeover.
G1674 161 TRADELINE; automatic changeover; contains
T874G2004 and Q674J1274; direct replacement
Y507J1003 (T874G1055/Q674J1035) Carrier part
no. 99TZ90040106 (HH07AT171/HH93AZ173).
Y594G1674
G1716 155 WaterFurnace logo; part no. TA21H03; contains
T874G2046 and Q674F1667.
Y594G1716
Y594H
H1004 79 Obsolete. LSI part no. 73033901; contains
T874H1039 and Q674C1124.
T8600D2028 H2 is night setback.
H1012 164 Contains T874H1062 and Q674C1249; replaces
T874H1005/Q674C1041.
Y594H1012
H1020 177 Obsolete. Mammoth part no. 71117101; contains
T874H1096 and Q674C1330.
Y594H1012 Wiring differences (old=new):
R1=R, R2=L; use jumper
provided.
H1038 74 Obsolete. Carrier part no. 50QE90019101; contains
T874H1161 and Q674C1496.
Y594H1012aWiring differences (old=new):
X1=O, Y2=Y; L-R jumper
required.
H1046 172 Obsolete. Carrier part no. 50QE90026101; contains
T874H1153 and Q674B1406.
T874A1130/
Q674B1075a
Wiring differences (old=new):
Y=Y1; W1-Y1 jumper required;
replacement has no LEDs.
H1053 173 Obsolete. Carrier part no. 50QE90027101; contains
T874H1153 and Q674C1322.
Y594H1012aWiring differences (old=new):
Z=X.
Y594J
J1001 241 Obsolete . TRADELINE; manual changeover;
contains T874J1069 and Q674L1900; direct
replacement for T874J1002 or T874A1028 used
with Q674L1074 or Q674L1637 (HH07AT175 or
HH07AT165 used with HH93AZ186 or
HH93AZ195).
(Recontrol)
T8511G1021
Table 10. Y594 Cross Reference.
Model
Number
Fig.
No. Description
Trade M odel
ReplacementaRemarks
aBoth the thermostat and subbase must be replaced.