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CARRIER
USES HONEYWELL Q674L1116 (HH93AZ171) SUBBASE
Existing
Function
Terminals
Common
C
Power
R
Compressor
Y
1st Stg. Heat
–
2nd Stage
Y1
Compressor
Fan
G
C/O Valve
–
Heat
C/O Valve
O
Cool
System Monitor/
L
System Defrost
EM. Heat
E
2nd Stg. Cool
–
LED Indication
–
Jumper Y2 to W2.
Terminal C (X1) must be connected to transformer common.
Optional CHECK LED on T8611M7008. Connect L to X1, jumper X2 to C.
Configure O/B (select models) in Installer Setup.
In this application, auxiliary heat and compressor two are both connected
to terminal Y1.
For second stage compressor LED indication, jumper X2 to Y2 on Q674.
For emergency heat LED indication, jumper X2 to E. For system monitor
LED indication, connect L to X2.
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER (CUSTOMER PART NUMBER)
70-6627 • 44
Chronotherm
Electromechanical
X1
R
Y1
W1
W2
G
B
O
X2
E
Y2
–
T874D1264/Q674L1116 (HH07AT173/HH93AZ171)
Electronic Replacement or Upgrade
®
III
C
C
R
R
Y
Y1
–
–
W2
Y2
G
G
B
O/B
O
O/B
L
L
E
E
Y2
–
X1 X2
–
Both first stage heat and cool are connected to Y or Y1/W1 terminal.
When subbase system switch is in AUTO position, equipment operates in
cool mode only.
LED is energized when terminal is powered.
L terminal is powered continuously when thermostat is in Em. Ht. position.
Chronotherm IV
C
C
R
R
Y1
Y1/W1
–
Y2
W2
G
G
O/B
O/B
O/B
O/B
L
L
E
E
–
Y2
X2
–
–
M13149
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