T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
49 60-2485—8
B1134 222 Obsolete. Carrier Synergy 2000 logo; part no.
HH07AT199; °C scaleplate; used with Q674E1395
(HH93AZ209).
T874B1019/
Q674E1049a
Wiring differences (old=new):
W1=W; RC-RH jumper
required; replacement has no
LEDs.
T874C 2-stage heat, 1-stage cool.
C1000 44, 76 Honeywell logo; used with Q674B1075, C1181; used in
Y594C1058.
T874C1018
C1018 60, 61,
81, 92
Honeywell logo; TRADELINE model; includes Allen
wrench and screws to lock cover; used with
Q674C1074.
T874C1018
C1026 44 Obsolete. AAF logo; °C scaleplate; includes Allen
wrench and screws to lock cover; non-adjustable range
stops set at 23°C (max. heat and min. cool) (73°F).
T874C1018 Replacement has °F
scaleplate.
C1034 44 Lennox logo; part no. 13F0401; °F/°C scaleplate. T874C1018 Replacement has °F
scaleplate.
C1042 44 Obsolete. Westinghouse logo; H1 anticipator factory set
at.75A; H2 anticipator factory set at 1.2A; used with
Q674A-E,G.
T874C1018
C1059 44, 142 Obsolete. Amana Air Conditioning logo; part no.
D68535-2; H1 anticipator factory set at 1.2A; used with
Q674E1056, Q674B1059, Q674F1022; used in
Y594C1009, Y594C1017, Y594C1256, Y594C1330.
T874C1018
C1067 44 Obsolete. Sears logo; part no. 42. 9297; °F/°C
scaleplate.
T874C1018 Replacement has °F
scaleplate.
C1075 51, 53 Carrier logo; part no. HH07AT170; used with
Q674B1166.
Y594C1421 or
T874C1018a
When using the T874C1018,
set stage 1 heat anticipator for
total current draw of fan and
stage 1 heat primary.
C1083 44 Obsolete. Trane logo; used with Q674E1007; used in
Y594C1082.
T874C1018
C1117 44 Honeywell logo; °C scaleplate. T874C1018 Replacement has °F
scaleplate.
C1125 60, 61,
92
Obsolete. Honeywell logo; 12°F (6.7°C) differential
between stage 1 heat and stage 2 heat; used with
Q674G1047.
T8611M2025
C1133 96 Obsolete. AAF/Snyder General logo; part no.
4ELN7546; no H1 heat anticipation; used with Q674A-
G,N and Q674C1173.
T874C1018 Must have H1 anticipator set
to maximum value.
C1141 44 Obsolete. Honeywell logo; meets DoD specs; includes
Allen wrench and screws to lock cover; no thermometer;
non-adjustable range stops set at 72°F (max. heat) and
78°F (min. cool) (22-26°C); field adjustable locking
levers.
T874C1141
C1158 44 Obsolete. Solaron special. T874C1018
C1166 51, 53 Obsolete. Carrier logo; part no. HH07AT160; °C
scaleplate; includes Allen wrench and screws to lock
cover; used with Q674B.
T874C1018aReplacement has °F
scaleplate; set stage 1 heat
anticipator for total current
draw of fan and stage 1 heat
primary.
C1174 44 Obsolete. Goettl logo. T874C1018
C1182 60 Obsolete. Goettl logo; H1 anticipator factory set at 0.8A;
used with Q674N1015.
T874C1018
C1190 44 Obsolete. Lennox logo; part no. 13F0501; °C scaleplate. T874C1018 Replacement has °F
scaleplate.
Table 8. T874 Cross Reference.
Model
Number
Fig.
No. Description
Trade Model
Replacement Remarks
aBoth the thermostat and subbase must be replaced.