Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 92

RHEEM/RUUD
COOLING CHANGEOVER (PRE 11/85) (PCA, PNA, PNB TYPICAL)
Existing
Function
Terminals
Common
X
Power
R
or
Compressor
Y1 Y
1st Stage
W1
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
W3
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.
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
70-6627 • 90
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
E E E
W3 W3 W3
– X2 X1 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 LED indication with completed circuit on X1 and X2 terminals.
Field-installed X2 to X (C) jumper.
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
Y2
M13198