Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 50

ECONAR
Existing
Function
Terminals
Common
X
Power
R
Compressor
Y
1st Stg. Heat
W1
Aux. Heat
W2
Fan
G
C/O Valve
B
Heat
System Monitor/
L
System Defrost
EM. Heat
E
Multiple Aux.
W3
Heat Loads
C/O Valve
O
Cool
LED Indication
–
2nd Stage
–
Compressor
Terminal X (C) must be connected to transformer common.
Remove factory-installed Y1 (Y) to W1 jumper.
Terminal is for multiple second stage loads such as contactors, sequencers,
or relays.
When W2 is not used, configure W2 cycle rate to NC.
70-6627 • 48
Electromechanical
X X
R R
Y Y1
W1 W1
W2 W2
G G
B B
L X1
E E
W3 W3
O O
X2 X2
– –
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER
T874G1915/Q674F1410
Electronic Replacement or Upgrade
Chronotherm ®
III
C C
R R
Y1 Y
W1 W1
W2 W2
G G
B B B
L L
E E
O O O
– –
– –
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
Install R8222D1014 (see page 12) for separate Y1 and W1 terminals.
Configure O/B (select models) in Installer Setup.
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
O/B B B O/B
L L L
E E E
or or
O/B O O O/B
– – X1 X2
– – –
C
R
Y1/W1
–
Aux.
G
O/B
L
E
O/B
–
W2
M13153