Operator's Manual

5 69-0737B—1

FROST CONTROL

Some Home Ventilation System models have built-in automatic preheat

frost control systems that allow the unit to operate in cold weather regions.

Areas where the winter design temperature does not fall below 5° F [-15°

C] will not require a preheater. The function of the frost control is to ensure

that the intake air brought into the Home Ventilation System is not below

10° F [-12° C]. This ensures proper operation of the Home Ventilation

System. Operation is indicated by the indicator light located on the Home

Ventilation System cabinet next to the

PRESS-TO-TEST

button. The

indicator light is on when the outdoor temperature is below 10° F [-12° C]

or the

TEST

button is pressed. The preheat system is functioning if the

indicator light comes on when the

TEST

button is pressed. Test the

preheat system before the heating seasons starts each year. Follow the

instructions on the cabinet for testing.

IMPORTANT:

Release the TEST button as soon as the neon light comes

on. Pressing the TEST button longer can cause overheating of the

Home Ventilation System.