Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 101

Existing
Function
Terminals
Common
B
Power
R
Compressor
Y
1st Stage
–
Heat
Aux. Heat
W or X1
Fan
G
C/O Valve
–
Heat
C/O Valve
O
Cool
System Monitor/
F
System Defrost
or
Outdoor
T H
Sensor
Outdoor Stat
X2
Multiple Aux.
–
Heat Loads
LED Indication
–
2nd Stage
–
Compressor
2nd Stage
–
Cool
Tape off. Outdoor reset not provided with Tradeline replacement thermostat.
Terminal must be connected to the transformer common.
Tape off. Thermostat replaces outdoor reset with improved zero droop
performance.
Configure O/B (select models) in Installer Setup.
Do not remove factory-installed jumper.
Optional Check LED on T8611G1004. See Fig. 26.
Field-installed X2 to X (C) jumper.
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
– – –
– – –
TRANE/AMERICAN STANDARD
Electronic Replacement or Upgrade
Chronotherm ®
III
C C
R R
or
Y1 Y Y
W1 W1
W2 W2
G G
B B B
O O O
L L
E E
X1 X2 –
– –
– –
LED is energized when terminal is powered.
L terminal is powered continuously when thermostat is in Em. Ht. position.
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
Terminal is for multiple auxiliary heat loads such as contactors, sequencers,
or relays.
When W2 is not used, configure W2 cycle rate to NC.
Chronotherm
IV
C C C
R R R
Y1 Y Y1
W1 W1 W1
W2 W2 W2
G G G
or or
O/B B B O/B
or or
O/B O O O/B
L L L
E E E
– – X1 X2
– – –
– – –
70-6627 • 99
C
R
Y1/W1
–
Aux.
G
O/B
O/B
L
E
–
W2
Y2
M13227