Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 106

WESTINGHOUSE
TYPICAL HSO
Existing
Function
Terminals
Common
X
Power
R
Compressor
Y
1st Stage
–
Heat
Aux. Heat
W
Fan
G
C/O Valve
B
Heat
C/O Valve
O
Cool
or
System Monitor/
L L1
System Defrost
Em. Heat
E
Multiple Aux.
W3
Heat Loads
LED Indication
–
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 is for multiple auxiliary heat loads such as contactors, sequencers,
or relays.
LED is energized when terminal is powered.
Terminal must be connected to the transformer common.
T872G1034/Q672F1141
T872G1034/Q672J1062
T872R1149/Q672L1151
T874G1048/Q674J1019
T874R1103/Q674L1108
70-6627 • 104
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 X1
E E E
– W3 W3
– X2 X2
– – –
– – –
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER
T872G1034/Q672F1091
T872G1265/Q672F1265
T874G1048/Q674F1121
T874G1048/Q674J1050
T874R1103/Q674L1173
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.
Optional Check LED on T8611G1004. See Fig. 26.
Field-installed X2 to X (C) jumper.
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
L terminal is powered continuously when thermostat is in Em. Ht. position.
T872G1034/Q672F1257
T872R1149/Q672L1110
T874G1048/Q674F1246
T874G1188/Q674F1295
T874R1244/Q674L1314
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
– – –
– – –
T872G1034/Q672J1013
T872R1149/Q672L1128
T874G1048/Q674F1279
T874G1345
T874W1007/Q674L1256
C
R
Y1/W1
–
Aux.
G
O/B O/B
O/B O/B
L
E
–
W2
Y2
M13210