Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 65

Existing
Function
Terminals
Common
X
Power
R
1st Stage
Y1
Cool
1st Stage
W1
Heat
2nd Stage
W2
Heat
Fan
G
C/O Valve
B
Heat
C/O Valve
O
Cool
or
System
X2 L
Monitor
or
EM. Heat
Z E
Defrost
–
2nd Stage
Y2
Cool
Multiple Aux.
–
Heat Loads
LED Indication
–
2nd Stage
–
Compressor
2nd Stage
–
Cool
Terminal X (C) must be connected to transformer common.
If provided on original equipment.
When W2 is not used, configure W2 cycle rate to NC.
If separate Y1 and W1 terminals are required, install R8222D1014; see page 12.
Select O/B (select models) in Installer Setup.
T872A-D/Q672F1000 T872A-D/Q672F1042
T872A-D/Q672F1026 T872C/Q672F1075
Electromechanical
X X
R R
Y1 Y1
W1 W1
W2 W2
G G
B B
O O
X1
E E
– –
– –
W3 W3
X2 X1 X2
– –
– –
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER
T874A-D/Q674F1006
T874A-D/Q674F1022
SEPARATE FIRST STAGE HEAT AND COOL TERMINALS
Electronic Replacement or Upgrade
Chronotherm ®
III
C C
R R
Y1 Y
W1 W1
W2 W2
G G
B B
O O O
L L
E E
P –
– –
– –
– –
– –
– –
Terminal is for multiple second stage heat loads such as contactors,
sequencers, or relays.
Remove factory-installed jumper for independent first stage heat and cool
operation.
T874A-D/Q674F1048
T874A-D/Q674F1089
HONEYWELL
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
– – –
– – –
T874R1616/Q674L1587
T8085A/Q682B1029
C
R
Y1/W1
Aux.
G
O/B O/B
O/B O/B
L
E
–
Y2
–
–
W2
Y2
M13187
T8300A/Q6300A
T8300B/Q6300B
70-6627 • 63