GSX14 Service Manual

SERVICING

To exit an equipment submenu and revert back to the

equipment menus, touch the Menu key. Touch Menu again

to revert back to the Thermostat Options Menu. Touch the

Run Schedule key to step out of all menus and back to the

CT thermostat Home Screen Display.

S-4 CHECKING TRANSFORMER AND CON-

TROL CIRCUIT

HIGH VOLTAGE!

Disconnect ALL power before servicing

or installing. Multiple power sources

may be present. Failure to do so may

cause property damage, personal injury

or death.

A step-down transformer (208/240 volt primary to 24 volt

secondary) is provided with each indoor unit. This allows

ample capacity for use with resistance heaters. The out-

door sections do not contain a transformer (see note be-

low).

NOTE: ComfortNet

ready condensing units may have

an optional 240VAC to 24VAC transformer installed. This

transformer provides 24VAC power to the unitary (UC) con-

trol in some communicating system installation scenarios.

WARNING

Disconnect ALL power before servicing.

1. Remove control panel cover, or etc., to gain access to

transformer.

With power ON:

WARNING

Line Voltage now present.

2. Using a voltmeter, check voltage across secondary

voltage side of transformer (R to C).

3. No voltage indicates faulty transformer, bad wiring, or

bad splices.

4. Check transformer primary voltage at incoming line

voltage connections and/or splices.

5 If line voltage available at primary voltage side of trans-

former and wiring and splices good, transformer is

inoperative. Replace.