Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 88

MAMMOTH
USED WITH A STANDARD HEAT PUMP THERMOSTAT
Existing
Function
Terminals
Common
C
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
–
Multiple Aux.
Heat Loads
–
LED Indication
–
2nd Stage
–
Compressor
2nd Stage
–
Cool
Configure O/B (select models) in Installer Setup.
Terminal is for multiple auxiliary heat loads such as contactors, sequencers,
or relays.
If provided on original equipment.
Terminal must be connected to the transformer common.
Do not remove factory-installed jumper.
Optional CHECK LED on T8611G1004. Connect L to X1; jumper X2 to C.
Field-installed X2 to X jumper.
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER (CUSTOMER PART NUMBER)
T834C2135 (71116901)
70-6627 • 86
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
– – –
– – –
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 –
– –
– –
Both first stage heat and cool are connected to Y terminal.
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B)
terminal.
When W2 is not used, configure W2 cycle rate to NC.
Optional LED indication activated with completed circuit on X1 and
X2 terminals.
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
– – –
– – –
T841B1042 (71117001)
C
R
Y1/W1
–
Aux.
G
O/B O/B
O/B O/B
L
E
X2 –
W2
Y2
M13194