Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 73

Existing
Function
Terminals
or
Common
X C
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
W3
or
LED Indication
X2 X1
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 X (C) must be connected to transformer common.
Terminal is for multiple second stage loads such as contactors, sequencers,
or relays.
Do not remove factory-installed jumper.
Optional CHECK LED on T8611G1004. See Fig. 26.
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
– – –
– – –
INTERTHERM/MILLER/NORDYNE
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 –
– –
– –
Field-installed X2 to X jumper provided.
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
Optional LED indication activated with completed circuit on X1 and
X2 terminals.
L terminal is powered continuously when thermostat is in Em. Ht. position.
LED is energized when terminal is powered.
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
M13192
70-6627 • 71