Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 109

Existing
Function Terminals
Common
Power
1st Stage Heat
Compressor Stage 1
Compressor Stage 2
2nd Stage Heat
Auxiliary 3rd
Stage Heat
Fan
C/O Valve
Cool
C/O Valve
Heat
System Monitor/
System Defrost
Em. Heat
LED Indication
When subbase system switch is in AUTO position, equipment will
operate in COOL mode only.
IMPORTANT: Do not use T874D/Q674F1022 if B terminal is used on
original equipment.
Y1 to W1 jumper required.
Terminal must be connected to the transformer common.
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER
Electromechanical
X X1
R R
– W1
Y1 Y1
Y2 Y2
– W2
– –
G G
O O
B
L X2
W E
– –
T872G1356/Q672L1219
T874D,G/Q674L1223
Electronic Replacement or Upgrade
Chronotherm ® III
C C
R R
– –
Y Y1
Y2 Y2
W2 –
W3 W3
G G
O O/B
B O/B
L L
E E
X1 X2 –
Optional LED indication activated with completed circuit on X1 and
X2 terminals.
Y2 to W2 jumper required.
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.
WESTINGHOUSE
TYPICAL 2-SPEED PUMP
Chronotherm IV
C C
R R
– –
Y1 Y1/W1
Y2 Y2
– W2
W3 Aux.
G G
O/B O/B
O/B O/B
L L
E E
X1 X2 –
70-6627 • 107
M13242