Power The Thermostat; Installing Batteries - Honeywell TB7220 COMMERCIALPRO Product Data

L1
(HOT)
24 VAC C
G
L2
1
Y
O/B
4
RC
2
R
CHANGEOVER VALVE
COMPRESSOR CONTACTOR
FAN RELAY
ECONOMIZER
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
1
PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER.
3 WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL.
4 "O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B"
IN THE INSTALLER SETUP.
5 OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR.
WIRES MUST HAVE A CABLE SEPARATE FROM THE
THERMOSTAT CABLE.
Fig. 20. Typical hookup of single-stage heat pump with
auxiliary heat (2H/1C).
L1
(HOT)
C
24 VAC
G
L2
1
Y
4 O/B
RC
2
R
CHANGEOVER VALVE
COMPRESSOR 1
FAN RELAY
COMPRESSOR 2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
1
PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER.
3 WHEN USING BATTERIES, THE 24V COMMON CONNECTION
IS OPTIONAL.
4
"O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B"
IN THE INSTALLER SETUP.
OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR.
5
WIRES MUST HAVE A CABLE SEPARATE FROM THE
THERMOSTAT CABLE.
Fig. 21. Typical hookup of multistage heat pump
with auxiliary heat (3H/2C).
3
W1
Y2
A
S1
S2
OUTDOOR/INDOOR
TEMPERATURE
5
SENSOR
AUXILIARY HEAT RELAY
M23020
3
W1
Y2
A
S1
S2
OUTDOOR/INDOOR
TEMPERATURE
5
SENSOR
AUXILIARY HEAT RELAY
ECONOMIZER
M23021
TB7220 COMMERCIALPRO™ PROGRAMMABLE THERMOSTAT

POWER THE THERMOSTAT

You can choose from three methods to power the thermostat:
• Batteries only (AAA alkaline).
• 24 Vac direct connection only.
• 24 Vac direct connection with battery backup (AAA alkaline).
Wiring 24 Vac Common
• Single-Transformer System—Connect the common side of
the transformer to the C screw terminal of the thermostat
wallplate. Leave the metal jumper wire in place between Rc
and R.
• Two-Transformer System—Connect the common side of
the cooling transformer to the C screw terminal of the
thermostat wallplate. Remove the metal jumper wire
between Rc and R.

Installing Batteries

1. Install two AA alkaline batteries on the back of the ther-
mostat as marked. See Fig. 22.
BATTERIES (2)
Fig. 22. Installing batteries.
2. Locate and remove tab labeled Remove. See Fig. 23.
IMPORTANT
This tab must be removed in order to set the real-time
clock.
REMOVE
TAB
Fig. 23. Remove tab labeled REMOVE from thermostat
9
BATTERY HOLDER
BACK OF THERMOSTAT
back.
M22259
M22260
63-2635—03