Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 57

Existing
Function
Terminals
Common
C
Power
R
Compressor
Y
1st Stage
–
Heat
Aux. Heat
W
Fan
G
C/O Valve
–
Heat
or
C/O Valve
W O
Cool
System Monitor/
X
System Defrost
EM. Heat
–
Multiple Aux.
–
Heat Loads
LED Indication
–
2nd Stage
–
Compressor
Configure O/B (select models) in Installer Setup.
LED is energized when terminal is powered.
Terminal is for multiple second stage heating loads such as contactors,
sequencers, or relays.
E-W2 jumper required unless emergency heat function is wired separately.
Terminal X (C) must be connected to transformer common.
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
– – –
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 –
– –
Do not remove factory-installed jumper.
Optional CHECK LED on T8611G1004. See Fig. 26.
Field-installed X2 to X jumper (provided).
L terminal is powered continuously when thermostat is in Em. Ht. position.
When W2 is not used, configure W2 cycle rate to NC.
FLORIDA HEAT PUMP
TYPICAL "LT" UNITS
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
M13175
70-6627 • 55