Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 42

BARD
Models: 24UHPQC, 30UHPQC, 42UHPQC, 48UHPQB, 48UHPQB-B, 48UHPQC-B, 60UHPQC-B
Existing
Function
Terminals
C or X
Common
or X1
Power Rh
or R
Rc
Compressor
Y
1st Stg. Heat
–
Aux. Heat
W2
Fan
G
or
C/O Valve
B W1
Heat
C/O Valve
O
Cool
System Monitor/
L
System Defrost
EM. Heat
E
Multiple Aux.
W3
Heat Loads
LED Indication
–
2nd Stage
–
Compressor
Configure O/B (select models) in Installer Setup.
When W2 is not used, configure W2 cycle rate to NC.
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
Terminal is for multiple second stage heating loads such as contactors,
sequencers, or relays.
70-6627 • 40
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 W3
– X2 X2
– – –
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER
T872N1036/Q672F1299
T872N1164/Q672L1185
T874N1024/Q674F1261
Electronic Replacement or Upgrade
Chronotherm ®
III
C C
R R
or
Y1 Y Y
W1 W1
W2 W2
G G
B B
O O
L L
E E
X1 X2 –
– –
Terminal X (C, X1) must be connected to transformer.
Do not remove factory-installed jumper.
Optional CHECK LED on T8611G1004. See Fig. 26.
Field-installed X2 to X jumper (provided).
LED is energized when terminal is powered.
L terminal is powered continuously when thermostat is in Em. Ht. position.
T874R1129/Q674L1181
T874R1152/Q674L1207
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 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
M13145