Honeywell T874 - Page 61

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
61 60-2485—8
G1659 177 Obsolete. Mammoth logo; 0.8A maximum current
through B or O terminal; 12°F differential between H1
and H2 for night setback; used with Q674C1330; used in
Y594G1427.
Y594H1012
a
Wiring differences (old=new):
R2=L, R1=none; L-R jumper
required; no night setback.
T8611G1004
(programmable)
Includes night setback.
G1675 174 Obsolete
. American Standard logo; part no.
ASYSTAT650; used with Q674J1142; used in
Y594G1443.
Y594G1161
a
G1691 176 Obsolete. Command Aire logo; part no. P1013-0060;
12°F (6.6°C) differential between H1 and H2 for night
setback; used with Q674C1389, C1397.
Y594H1012
a
Wiring differences (old=new):
Y1=O, Y2=Y, R=none; L-R
jumper required; no night
setback.
T8611G1004
(programmable)
Includes night setback.
G1717 175 Obsolete
. Carrier Heat Pump System Control logo; part
no. HH07AT102N; used with Q674J1167; used in
Y507J1201.
Y594G1252
a
Wiring differences (old=new):
C=X, D=L; replacement has
AUX. HEAT and EM. HEAT
LEDs.
G1741 227 Honeywell logo; TRADELINE model; includes factory
set range stops at 68°F (max. heat) and 78°F (min.
cool); Premier White® color; used with Q674F1477;
used in Y594G1476.
Y594G1476
a
G1758 211 Trol-A-Temp by Honeywell logo; Premier White® color;
changeover is provided by Trol-A-Temp zone panel;
used with Q674F1485; used in Y594G1492.
None See Trol-A-Temp for
replacement.
G1774 216 Obsolete. Comfortmaker logo; part no. 1505756; used
with Q674J1175; used in Y594G1500.
Y594G1252
a
Wiring differences (old=new):
E=W2, W1=W3, X=E, C=X.
G1782 216 Obsolete
. Arcoaire logo; part no. 1506756; used with
Q674J1175; used in Y594G1518.
Y594G1252
a
Wiring differences (old=new):
E=W2, W1=W3, X=E, C=X.
G1790 161 Obsolete
. Carrier logo; Premier White® color; °C
scaleplate; includes Allen wrench and screws to lock
cover; used with Q674J1191.
Y594G1252
a
Wiring differences (old=new):
C=X; replacement has °F
scaleplate.
G1816 163 Climate Master logo; part no. AT5716; °F/°C scaleplate;
10°F differential between H1 and H2 and momentary
RESET system switch position.
Y594G1393
a
No momentary reset switch.
G1824 227 Honeywell logo; Australian TRADELINE model; Premier
White® color; °C scaleplate; used with Q674F1477;
used in Y594G1534.
Y594G1476
a
G1832 231 Obsolete. Intertherm logo; used with Q674F1519; used
in Y594G1542.
Y594G1252
a
Replacement has auto
changeover in cooling mode
only.
G1840 231 Obsolete
. Miller logo; used with Q674F1519; used in
Y594G1559.
Y594G1252
a
Replacement has auto
changeover in cooling mode
only.
G1857 229 Obsolete
. Lennox logo; °C scaleplate; Premier White®
color; used with Q674F1535; used in Y594G1583.
Y594G1161
a
Wiring differences (old=new):
E=X2, C=B, L=F.
G1865 160 Honeywell logo; TRADELINE model; designed to
replace Y594G1013 (York part no. 2TH11702424),
Y594G1229 (York part no. 6TH11702424), and York part
no. 2TH117704124); used with Q674J1209; used in
Y594G1567.
Y594G1567
a
Table 8. T874 Cross Reference.
Model
Number
Fig.
No. Description
Trade Model
Replacement Remarks
a
Both the thermostat and subbase must be replaced.