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.
Y594R1797a
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.
Y594R1797a
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).
Y594G1419aWiring 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
aBoth the thermostat and subbase must be replaced.