Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 91

Existing
Function
Terminals
Common
C
Power
R
Compressor
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
Em. Heat
E
Multiple Aux.
Heat Loads
–
LED Indication
X2
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.
Terminal is for multiple auxiliary heat loads such as contactors, sequencers,
or relays.
Terminal must be connected to the transformer common.
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
Electromechanical
X X X
R R R
Y Y Y1
– W1 W1
W2 W2 W2
G G G
B B B
O O O
L
E E E
W3 W3 W3
– X2 X1 X2
– – –
– – –
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER
Chronotherm ®
III
C C
R R
or
Y1 Y Y
W1 W1
W2 W2
G G
B B
O O
L L
E E
X1 X2 –
– –
– –
Do not remove factory-installed jumper.
Field-installed X2 to X jumper.
LED is energized when terminal is powered.
L terminal is powered continuously when thermostat is in Em. Ht. position.
Optional LED indication activated with completed circuit on X1 and
X2 terminals.
T8611R1174
PHILLIPS ENERGY
Electronic Replacement or Upgrade
Chronotherm
IV
C C
R R
Y1 Y Y1
W1 W1 W1
W2 W2 W2
G G
or or
B O/B B B
or or
O O/B O O
L L
E E
– – X1 X2
– –
– –
C C
R R
Y1/W1
–
Aux.
G G
O/B O/B
O/B O/B
L L
E E
–
– W2
– Y2
M13197
70-6627 • 89