Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 60

GENERAL ELECTRIC
Existing
Function
Terminals
or
Common
C B
Power
R
Compressor
Y
1st Stage
–
Heat
or
Aux. Heat
W1 W
Fan
G
C/O Valve
–
Heat
C/O Valve
O
Cool
or
System Monitor/
F L
System Defrost
EM. Heat
–
Outdoor
T
Sensor
or
E X2
Outdoor
Thermostat
Defrost Control –
Multiple Aux. W2
Heat Loads
LED Indication
–
2nd Stage
–
Compressor
Tape off. Outdoor reset not provided with TRADELINE® replacement
thermostats.
Terminal X (C) must be connected to transformer common.
Tape off. Electronic thermostat replaces outdoor reset with improved zero droop
performance.
Terminal is for multiple auxiliary heat loads such as contactors, sequencers,
or relays.
Do not remove factory-installed jumper.
70-6627 • 58
Electromechanical
X X X
R R R
Y Y1 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
– – –
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
P –
X1 X2 –
– –
Optional CHECK LED on T8611G1004. See Fig. 26.
Field-installed X2 to X jumper (provided).
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
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.
L terminal is powered continuously when thermostat is in Em. Ht. position.
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
M13181