Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 62

HEAT CONTROLLER/COMFORT AIR
Existing
Function
Terminals
Common
C
Power
R
Compressor
W1
1st Stage
–
Heat
Aux. Heat
W2
Fan
G
C/O Valve
–
Heat
C/O Valve
Y1
Cool
System
X
Monitor
EM. Heat
E
Multiple Aux.
–
Heat Loads
LED Indication
–
2nd Stage
–
Compressor
2nd Stage
–
Cool
Configure O/B (select models) in Installer Setup.
Both first stage heat and cool are connected to Y terminal.
Terminal is for multiple second stage loads such as contactors, sequencers,
or relays.
If provided on original equipment.
Terminal X (C) must be connected to transformer common.
70-6627 • 60
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
– – –
– – –
TYPICAL THERMOSTATS AND SUBBASES—HONEYWELL MODEL NUMBER
T874G1469/Q674F1345
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.
When W2 is not used, configure W2 cycle rate to NC.
Optional LED indication activated with completed circuit on X1 and
X2 terminals.
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
M13217