Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 37

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE
Terminal must be connected to the transformer common.
Terminal is for multiple auxiliary heat loads such as contactors, sequencers, or relays.
Configure O/B (Select Models) in Installer Setup.
Optional LED indication activated with completed circuit on X1 and X2 terminals.
If separate Y1 and W1 terminals are required, install R8222D1014; (See page 12.)
When W2 is not used, configure W2 cycle rate to NC.
LED is energized when terminal is powered.
L terminal is powered continuously when thermostat is in Em. Ht. position.
Do not remove factory-installed jumper.
If multiple auxiliary heat loads are used, connect to W2 (Aux W8900B) terminal.
Used on two-speed compressor heat pump applications.
Used on heat pumps that energize the compressor on both first stage cooling and first stage heating through a common Y
terminal.
Q674F1022 switching subbase available when separate first stage heat and cool terminals are required. See specific heat pump
manufacturer's listing for hookup information.
P terminal on T8611R1000 only. Energized in heating and cooling modes; shown only when used.
Jumper W2 and Y2 if stage 2 heating and cooling are common.
To change fan operation in Emergency Heat mode, see page 9.
TO R
X1
FAULT DETECTION
CHECK
SWITCH
LED
(YELLOW)
TO C/X
X2
SWITCH TO R (POWER) SIDE
OF SYSTEM TRANSFORMER
TO R
X1
CHECK
LED
(YELLOW) FAULT DETECTION
SWITCH
TO C/X
X2
SWITCH TO C (COMMON) SIDE SWITCH IN SECONDARY OF
OF SYSTEM TRANSFORMER SEPARATE TRANSFORMER
X1
L1
SWITCHING
CHECK
(HOT)
DEVICE
LED
L2
(YELLOW)
24 VAC
X2
M13246
70-6627 • 35