Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 74

INTERTHERM/MILLER/NORDYNE
Existing
Function
Terminals
Common
X
Power
R
Compressor
Y
1st Stage
–
Heat
Auxiliary
W2
Heat
Fan
G
Outdoor
T
Thermistor
Em. Heat
K
C/O Valve
W1
Cool
System Monitor/
Z
System Defrost
For best performance, use a NEMA rated transformer.
Terminal B (C, X) must be connected to transformer common.
Configure O/B (select models) in Installer Setup.
Leave factory-installed jumper W1-Y1 (Y) in place.
Tape off. Electronic thermostat replaces outdoor reset with improved zero
droop performance.
70-6627 • 72
Electromechanical
B B B
R R R
Y Y Y1
– – –
W W W
G G G
T T T
X2 X2 X2
O O O
F F F
Electronic Replacement or Upgrade
®
Chronotherm
III
C C
R R
or
Y1 Y Y
W1 W1
W2 W2
G G
E E
O O O
L L
To eliminate auto fan in EM. Heat mode, see page 9.
Use Aux terminal for Auxiliary heat and configure W2 cycle rate to NC.
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
E E E
or or
O/B O O O/B
L L L
C
R
Y1/W1
–
Aux.
G
E
O/B
L
M13160