Specifications

How the Air Flow Sensor Works (available on specific models)

The electronic AFS was designed to provide an efficient and reliable method

of controlling the operation of the air cleaner when the dealer is unable to

wire the unit directly into the furnace blower. The electronic AFS utilizes a

thermistor that heats up to approximately 130°F. The AFS then stabilizes at

this temperature and when the furnace blower turns on and air flows through

the ductwork, the same vacuum effect pulls cooler air over the hot surface.

This air movement cools down the thermistor and this cooling down effect

allows the electronic AFS to understand that the furnace blower is moving air

and the Electronic Air Cleaner must turn on to provide air cleaning.

If the air cleaner is installed in a location that is dusty and dirty, the sensor on

the AFS can become coated with dirt and lint. This coating can insulate the

AFS and keep it from operating properly. To clean the thermistor, take a

cotton swab dipped in rubbing alcohol and carefully insert it into the hole

located on the right hand side of the power pack assembly (when facing the

unit). The hole is 3/16 " in diameter and is located on the front of the power

tray assembly. Carefully twirl the cotton swab between your fingers, making

sure the tip is lightly in contact with the grey disc, cleaning this coating from

the thermistor.

AFS TROUBLESHOOTING

It is recommended that the following procedure only be performed

by an authorized HVAC contractor. Failure to do so may expose an

individual to personal injury

1. Make sure the furnace blower is not operating, the rocker switch

is OFF and the circuit breaker is turned OFF or cord is

disconnected.

2. Remove the access door.

3. Remove power tray assembly.

4. Locate the AFS. It is a circuit board with a small grey disc

connected to the circuit board by two(2) silver wires (similar to

Figure 1). Carefully bend the thermistor so that it is located in the

center of the opening and approximately 1/8" from the inside edge

of the power pack assembly.

5. Reinstall the power tray assembly and access door.