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SQUARE D/SUN DIAL
Existing
Function
Terminals
or
or
Common
X
X1
C
Power
R
or
Compressor
Y
Y1
1st Stage
W1
Heat
Aux. Heat
W2
Fan
G
C/O Valve
B
Heat
C/O Valve
O
Cool
System Monitor/
L
System Defrost
or
Em. Heat
K
E
LED Indication
X2
2nd Stage
–
Compressor
2nd Stage
Y2
Cool
Remove factory-installed Y1 (Y) to W1 jumper.
Terminal must be connected to the transformer common.
If separate Y1 and W1 terminals are required, install R8222D1014; see page 12.
Optional LED indication activated with completed circuit on X1 and
X2 terminals.
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER (CUSTOMER PART NUMBER)
70-6627 • 96
Chronotherm
Electromechanical
X1
R
Y1
W1
W2
G
B
O
X2
E
X2
–
Y2
T872C1525/Q672F1182 (HCD-2/HCB-1)
T874C1224/Q674F1071 (63600-002-09/63600-002-11)
Electronic Replacement or Upgrade
®
III
C
C
C
R
R
R
or
Y1
Y
Y
Y1
W1
W1
W1
W2
W2
W2
G
G
G
or
B
B
B
or
O
O
O
L
L
L
E
E
E
–
–
When W2 is not used, configure W2 cycle rate to NC.
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
Y
Y1
W1
W1
W2
W2
G
G
or
O/B
B
B
O/B
or
O/B
O
O
O/B
L
L
E
E
X1 X2
–
–
–
C
R
Y1/W1
–
Aux.
G
O/B
O/B
L
E
–
W2
Y2
M13202
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