Honeywell TB7220 User Manual

TB7220 COMMERCIALPRO™ PROGRAMMABLE THERMOSTAT

63-2635—03

Fig. 20. Typical hookup of single-stage heat pump with

auxiliary heat (2H/1C).

Fig. 21. Typical hookup of multistage heat pump

with auxiliary heat (3H/2C).

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.

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.

Fig. 23. Remove tab labeled REMOVE from thermostat

back.

COMPRESSOR CONTACTOR

ECONOMIZER

M23020

CHANGEOVER VALVE

FAN RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

FACTORY INSTALLED JUMPER.

WHEN USING BATTERIES, THE 24V COMMON CONNECTION

IS OPTIONAL.

"O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B"

IN THE INSTALLER SETUP.

OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR.

WIRES MUST HAVE A CABLE SEPARATE FROM THE

THERMOSTAT CABLE.

OUTDOOR/INDOOR

TEMPERATURE

SENSOR

(HOT)

24 VAC

AUXILIARY HEAT RELAY

C
G
Y

O/B

S1
S2

COMPRESSOR 1

COMPRESSOR 2

M23021