Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 61

Existing
Function
Terminals
Common
X
Power
R
Compressor
Y
1st Stage
–
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. W3
Heat Loads
LED Indication
–
2nd Stage
–
Compressor
Configure O/B (select models) in Installer Setup.
Terminal X (C) must be connected to transformer common.
Terminal is for multiple auxiliary heat loads such as contactors, sequencers,
or relays.
Terminal must be connected to the transformer common.
Do not remove factory-installed jumper.
Optional CHECK LED on T8611G1004. See Fig. 26.
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 X1
E E E
W3 W3 W3
– X2 X2
– – –
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER
Electronic Replacement or Upgrade
®
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 –
– –
Field-installed X2 to X jumper (provided).
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
L terminal is powered continuously when thermostat is in Em. Ht. position.
LED is energized when terminal is powered.
When W2 is not used, configure W2 cycle rate to NC.
T841A1118
GEO SYSTEM
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 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
M13182
70-6627 • 59