Dantherm 4000 Series Panduan Servis - Halaman 10

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Service Guide

Preventative maintenance

Introduction

Preventive maintenance has to be performed in order to:

• Continue operation in specified range

• Avoid malfunctions

• Avoid inefficient operation

• Maximize the unit's lifetime

The factory warranty is only valid if documented preventive maintenance has been

performed within time interval of:

• Maximum 6 months when unit is located in normal air quality environment

• Maximum 2 months when unit is located in bad quality air environment

A written log at site is adequate documentation for preventive maintenance.

• Switch off AC supply before working on the unit.

Warning

CAUTION

• Make sure that all work has been performed correctly before switching power back on.

Cleaning

The unit must be cleaned according to the recommended preventive maintenance plan.

Caution

Tools required:

• Vacuum cleaner or compressed air

• Soft brush

• TX20 screwdriver

• AC cleaning agent if it is very dirty

Phase

Description

Check and clean the outside air inlet grill. See page 8

Open the unit's outer cover by removing the two screws in the lower edge of the

cover

Vacuum the condenser coil and the visible part of the fan

Vacuum the evaporator coil from the inside of the enclosure.

IF any of the coils are still dirty, please apply AC cleaning agent on coil fins, and

after 5 minutes, rinse gently with water WITHOUT spraying water on any electrical

parts.

Perform end inspection according to the list in next section.

Preventative maintenance, continued

Inspection

The unit must be inspected prior to any re-assembly and put back into service. Please follow

below steps:

Phase

Description

Are the fans clean and free of any corrosion?

Are the coolant pipes free of obstructions, damage, corrosion and show no

obvious signs of leakage?

Are the coil lamellars clean and undamaged?

Are all fan blades free of any obstructions, cracks or missing blades?

When rotating the fans with the fingers, do the fans rotate freely without

vibrations and noise?

Is all wiring and insulation undamaged?

Are all connectors secured properly and in good condition?

Inspect the drain hose (if any) for damages.

Are any alarms visible on the controller? See page 9

The cooling circuit is designed for long durability, and is comprised of a few components.

Test cooling circuit

Any test of the circuit should be conducted only if a relevant problem has arisen .

Open the unit outside cover by removing the two screws in the lower part.

Locate the service valve and connect a pressure gauge. Confirm that the pressure is aligned

with the present temperature according the read pressure.

Please be aware that with very low amount of refrigerant, its critical to use short hoses to the

pressure gauge meter.

Test safety shut

The compressor's safety switch (Klixon) can be tested manually. Make sure that the unit's

down

cooling circuit is working before initiating this test.

Cover the condenser air inlet in the bottom of the outer cabinet with a piece of plastic

or something similar. Bring the unit into continuous operation (lower setpoint inside the

shelter), and expect shut down within a maximum one hour. If not, the switch is not working.