Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 90

MARTIN INDUSTRIES
Existing
Function
Terminals
Common
X
Power
R
Compressor
Y
1st Stage
–
Heat
Aux. Heat
W2
Fan
G
C/O Valve
B
Heat
C/O Valve
O
Cool
System Monitor/
L
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.
Both first stage heat and cool are connected to Y terminal.
Terminal is for multiple auxiliary heat loads such as contactors, sequencers,
or relays.
LED indication with completed circuit on X1 and X2 terminals.
Terminal must be connected to the transformer common.
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER (CUSTOMER PART NUMBER)
T841A1183
70-6627 • 88
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
E E E
W3 W3 W3
– X2 X1 X2
– – –
– – –
T841A1522
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.
When W2 is not used, configure W2 cycle rate to NC.
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
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
or or
B O/B B B
or or
O/B O O
L L L
E E E
– – X1
– – –
– – –
T841A1548 (24015808)
C
R
Y1/W1
–
Aux.
G
O/B O/B
O/B O/B
L
E
X2 –
W2
Y2
M13196