Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 93

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
L
Monitor
Em. Heat
E
Multiple Aux.
–
Heat Loads
LED Indication
–
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.
Do not remove factory-installed jumper.
PCB, PFA, PGB, PGA HEATING CHANGEOVER (AFTER 11/85) RPCB, RPFA
Electromechanical
X X X
R R R
Y Y1 Y1
– W1 W1
W2 W2 W2
G G G
B B B
O O –
L L X1
E E E
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 –
– –
– –
Optional Check LED on T8611G1004. See Fig. 26.
Field-installed X2 to X (C) jumper.
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
LED is energized when terminal is powered.
L terminal is powered continuously when thermostat is in Em. Ht. position.
RHEEM/RUUD
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
– – –
– – –
C
R
Y1/W1
–
Aux.
G
O/B O/B
O/B O/B
L
E
X2 –
W2
Y2
M13206
70-6627 • 91