AIRTAK SD30 Panduan Petunjuk Pengoperasian - Halaman 7

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TROUBLESHOOTING GUIDE continued

9. Shortage of refrigerant

10. Refrigeration system is not functioning.

11. Excessive pressure dew point.

High

1. Excessive air flow

Pressure

Drop

2. Freeze up

The unit will

1. Line disconnect switch is open. Power

not run or

on light will be off.

cycles off

and on.

2. Fuse or breaker is open. Power on light

will be off.

Fix the leak and add a charge of

refrigerant. Loss of refrigerant will cause

improper functioning. A qualified

refrigerant specialist should perform the

necessary repairs, or factory should be

contacted if the unit is under warranty.

Check to be certain refrigerant

compressor is running. It is possible for

the fan to be operating but not the

compressor. Compressor not running

can be caused by several factors. A

qualified refrigeration contractor should

check refrigerant and electrical controls.

Readjust expansion valve. The

expansion valve operates like a pressure

regulator. Loosen lock nut. Turning the

adjustment screw on the expansion valve

counterclockwise decreases refrigerant

pressure and lowers refrigerant

temperature. Adjust valve in ¼ turn

increments to allow 15 minutes for

pressure stabilization with air flowing.

Caution: too low a setting can cause

moisture in heat exchanger to freeze.

Check the air flow. This dryer is

designed for a specified air flow as

indicated. If air flow into the dryer

exceeds specifications, the water

removal capacity may be insufficient

resulting in a liquid carry-over

downstream. Check the flow of the air

system.

Readjust refrigeration controls. Frosting

of the lines is an indication the controls

are set too low. MODELS 10 SCFM

THROUGH 40 SCFM -Controls may be

adjusted in the field by means of the

expansion valve adjustment screw.

MODELS 50 SCFM THROUGH 250

SCFM Controls may be adjusted in the

field by means of the hot gas bypass

valve. Loosen lock nut. Turn screw

clockwise to increase refrigerant

pressure setting which will increase

refrigerant temperature. Turn screw in ¼

turn increments until frost disappears.

Allow 15 minutes between adjustments

for pressure stabilization with air flowing.

Close the start or disconnect switch. If

the dryer is not operating check the

disconnect switch or circuit breaker to be

certain it is on.

Replace fuse or reset the breaker. The

fuse to the power line should be

checked. Make sure the correct size

fuse is used. See data tag label for

correct fuse size.