AIRFLOW SWITCH

For Gas and Electric Tumblers

The airflow switch (located on the rear of tumbler) is set at the factory for proper operation. Refer to Figure 17. Steam models do not have an airflow switch. However, if there is a problem with the switch, it should be adjusted as follows:

NOTICE: Control panel must be in place and access door closed before attempting to adjust airflow switch.

IMPORTANT: Airflow switch disc must remain closed during operation. If it opens and closes during the drying cycle, this indicates insufficient airflow through the tumbler. If switch remains open, or pops open and closed during the cycle, the heating system will shut off. The cylinder and fan will continue to operate even though the airflow switch is malfunctioning.

WARNING

To reduce the risk of fire, airflow switch operation may be affected by a clogged lint screen, lack of make-up air, obstructions in the vertical recirculation stack or in the customer installed main or collector ducts. These conditions must be checked and necessary corrections made before adjusting airflow switch. Always adjust airflow at installation.

W073

The airflow switch operation is controlled by the counterweight position in the shaft. Moving the counterweight either increases or decreases airflow switch sensitivity. The counterweight should be adjusted so the airflow will force the disc away from the cabinet when the lint panel is opened 6 inches (15.24 cm) with a full load. Adjust the airflow switch as follows:

1.Load the tumbler. This adjustment is much faster to make with one person opening lint panel in front and another adjusting the counterweight in the rear of tumbler.

2.Start the tumbler. Open the lint panel 6 inches (15.24 cm). The airflow disc should move away from the cabinet, opening the switch contacts and shutting off the heat system. This indicates proper operation and proper adjustment.

3.If switch is not opening as described in step “2”, it should be adjusted so it is MORE sensitive. Depress the spring clip and move counterweight toward disc. Retest by opening lint panel and continue moving counterweight toward disc until switch operates as described in step “2”.

4.If switch opens BEFORE lint panel is opened the proper distance, step “2”, it should be adjusted so it is LESS sensitive. Depress the spring clip and move counterweight away from the disc. Retest by opening lint panel and continue moving counterweight away from disc until switch operates as described in step “2”.

 

MOUNTING

 

SWITCH

 

BRACKET

 

 

 

 

ADJUSTING

AIR FLOW

 

REAR

SCREWS

 

 

SWITCH

 

 

 

PANEL OF

 

 

 

 

 

 

TUMBLER

 

 

 

 

SCREW

 

SWITCH

AIR FLOW

 

 

SWITCH

 

 

LEVER

 

 

 

 

 

DISC

VANE

SWITCH

 

LEVER

LEVER

 

 

 

 

ARM

 

COUNTERWEIGHT

 

 

SPRING

 

 

CLIP

 

 

 

 

 

DISC

 

 

 

 

COUNTERWEIGHT

 

SPRING

 

 

 

CLIP

 

T041IE3A

 

 

 

Figure 17

42

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