Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 72

INTERTHERM/MILLER/NORDYNE
Existing
Function
Terminals
Common
X
Power
R
Compressor
Y
1st Stage
–
Heat
Aux. Heat
W2
Fan
G
C/O Valve
W1
Heat
C/O Valve
–
Cool
System
Z
Monitor
Em. Heat
K
LED Indication
–
2nd Stage
–
Compressor
2nd Stage
–
Cool
Configure O/B (select models) in Installer Setup.
When W2 is not used, configure W2 cycle rate to NC.
LED is energized when terminal is powered.
Terminal X (C) must be connected to transformer common.
Do not remove factory-installed jumper.
70-6627 • 70
Electromechanical
X X X
R R R
Y Y Y
– – –
W2 W2 W2
G G G
B B B
O O O
L L L
E E E
– – –
– – –
– – –
Electronic Replacement or Upgrade
®
Chronotherm
III
C C
R R
or
Y1 Y Y
W1 W1
W2 W2
G G
B B
O O O
L L
E E
X1 X2 –
– –
– –
Optional LED indication activated with completed circuit on X1 and
X2 terminals.
L terminal is powered continuously when thermostat is in Em. Ht. position.
To eliminate auto fan in emergency heat mode, add switching relay as
shown on page 9.
Chronotherm
IV
C C C
R R R
Y1 Y Y1
W1 W1 W1
W2 W2 W2
G G G
or or
B O/B B B
or or
O/B O O
L L L
E E E
– – X1 X2
– – –
– – –
C
R
Y1/W1
–
Aux.
G
O/B O/B
O/B O/B
L
E
–
W2
Y2
M13191