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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8 86
L1868 125 TRADELINE; includes two LEDs; used with
T874R1988; used in Y594R1797; direct replacement
for Evcon/Coleman Y594R1235 (T874R1368/
Q674L1421) Coleman part no. 3600-368.
Y594R1797
a
L1876 245 Obsolete. Amana part no. 10573902; includes two
LEDs; used with T874R2002; used in Y594R1805.
Y594R1797 Wiring differences (old=new):
C/X=X.
L1884 245 Obsolete
. Amana part no. 10573904; includes two
LEDs; used with T874R2010; used in Y594R1813.
Y594R1797 Wiring differences (old=new):
C/X=X, W3=W2.
L1892 103 Obsolete
. TRADELINE; System: SUPL HT-HEAT-
OFF-COOL; includes one LED; used with T874G2004;
used in Y594G1666; direct replacement for Carrier
Y507J1011 (T874G1055/Q674L1041) Carrier part no.
HH07AT171/HH93AZ175.
Y594G1674 Replacement has auto
changeover.
L1900 241 Obsolete
. TRADELINE; System: SUPL HT-HEAT-
OFF-COOL; includes SUPL HT LED; used with
T874J1069; used in Y594J1001; direct replacement for
Carrier T874J1028/Q674J1068 (Carrier part no.
HH07AT165/HH93AZ183), Carrier T874J1002/
Q674J1068 (Carrier part no. HH07AT175/
HH93AZ183).
Y594J1019 Replacement has auto
changeover.
L1918 125 Obsolete
. York logo; part no. 2TH11703424A; includes
two LEDs; used with T874R2028 in Y594R1821.
Y594R1797
a
L1934 123 Obsolete. Addison logo; part no. 843-277; includes
three LEDs; used with T874W1106 in Y594W1055.
T8611M2025
Q674N System: OFF-HEAT-COOL-EVAP; Fan: AUTO-ON
N1015 60 Obsolete
. Goettl heat pump; changeover in heat mode;
evaporative cooler circuit; used with T874C1182.
See OEM for
replacement.
N1023 61 Obsolete
. Sigler heat pump; evaporative cooler circuit;
used with T874C1349.
See OEM for
replacement.
Q674P System: SUPL HT-HEAT-COOL; Fan: AUTO-ON
P1005 126 Obsolete. Carrier heat pump; part no. HH93AZ169;
used with T874G1071 (HH07AT171).
Y594G1419
a
Wiring differences (old=new):
C=X; jumper Y1-W1;
replacement has OFF-EM HT-
HEAT-AUTO-COOL system
switching.
Q674Q System: HEAT-OFF-COOL; Fan: LOW-MED-HI-ON
Q1004 59 Obsolete
. McQuay special; used with T874A1267. See OEM for
replacement.
Q1012 64 Used with T874A1291. None
Q674R System: OFF-COOL; Fan: LO-HI-CONT
R1003 69 Obsolete
. Carrier part no. HH93AZ190; international
symbols on fan and switches; used with T874V1008
(HH07AT177).
See OEM for
replacement.
Q674S System: HEAT-COOL; Fan: None
S1000 70 Obsolete
. Fiberglas; Canada; SERVICE LED; used
with T874C1653; used in Y594C1348.
See OEM for
replacement.
Q674W System: OFF-ON; Fan: LO-MED-HI
W1006 240 Obsolete
. Snyder General part no. 044271801. See OEM for
replacement.
Table 9. Q674 Subbase Cross Reference.
Model
Number
Fig.
No. Description
Q674 Trade
Replacement Remarks
a
Both the thermostat and subbase must be replaced.