Dehumidifier

DC-900 DC-900H

PROBLEM POSSIBLE REASON TROUBLE SHOOTING

The unit doesn’t work at all.

1. Bad connection of the main plug (Part #211).

2. Humidistat (Part #208) breaks down. 3. Water tank (Part #102) not positioned well. 4. Micro switch (Part #207) springs off.

1. Replug. 2. Check and repair or replace. 3. Re-place the water tank. 4. Check, repair or replace.

Compressor works, but the fan doesn’t.

1. Bad wires connection. 2. Speed switch (Part #209) breaks down. 3. Fan motor (Part #202) not work at all. 4. Fan blade (Part #122) is stuck.

1. Re-connect & fasten them firmly.

2. Check, repair or replace. 3. Replace. 4. Check and adjust.

Compressor doesn’t work, only fan to circulate the air.

1. Bad wire connection.

2. Overload protector of compressor breaks

down. 3. Starting relay of compressor breaks down. 4. Humidistat (humidity controller) breaks

down. 5. Compressor breaks down. 6. The unit is on the mode of “Anti-Frost” . 7. Anti-frost p.c. board breaks down.

1. Re-connect & fasten them firmly.

2. Check and repair or replace. 3. Check and repair or replace. 4. Check and repair or replace. 5. Check and repair or replace. 6. Normal condition. 7. Check and repair or replace.

Noise too loud

1. Fan blades scratch the surrounding parts. 2. Fan Motor makes loud noise. 3. Fan motor screws get loose. 4. Compressor screws get loose.

1. Check and position Fan blade well.

2. Repair/replace Fan motor. 3. Re-fasten screws. 4. Re-fasten screws.

Frost (Ice) formed on the surface of Evaporator.

1. Insufficient refrigerant. 2. Anti-frost p.c. board is out of function

(below 16°C). 3. Dusty filer.

1. Find out and repair the leakage, then recharge the unit.

2. Check and repair or replace. 3. Clean the filter.

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How to?

REPLACE THE COMPRESSOR

1. Take out the filter, remove the rear plate. 2. Take off the cover of overload protector, take

off the wire terminals and screws of the earth wire.

3. Use soldering iron to take off the discharging tube and suction tube from the compressor.

4. Unfasten the screws on the compressor. 5. Replace the compressor. 6. Re-assemble the unit in opposite process from

above

7. Vacuum the unit, then recharge the refrigerant. * Please refer to the rating label at the rear of the unit for correct refrigerant volume.

** Before soldering, need to clear out the refrigerant completely.

REPLACE THE OVERLOAD PROTECTOR & STARTING RELAY

1. Take off the cover of the overload protector (Part #201A), take off the wire terminals.

2. Take out the starting relay and overload protector.

3. Replacing with a new, fine one. 4. Re-assemble the unit in opposite process from

above.

REPLACE THE ANTI-FROST P.C. BOARD & INDICATOR 1. Pull out the water tank, take off the filter, remove

the front & rear plates.

2. Take off all the wires terminals.

3. Replacing the defect anti-frost p.c. board & indicator.

4. Re-assemble the unit in opposite process from above

Notice! Do not insert the wire terminals in the wrong position.

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REPLACE THE MICRO SWITCH

1. Take out the filter, remove the rear plate. 2. Separate the relative wires surrounding the

micro switch and take off the micro switch (part no. 211) from the middle spacer.

3. Replacing with a new one. 4. Re-assemble the unit in opposite process

from above.

REPLACE THE FAN MOTOR

1. Pull out the water tank, take off the filter, remove the front & rear plates.

2. Take off the sensor fixer (part no. 117) & up wind funnel.

3. Take out the fan motor from the motor fixer.

4. Replace the motor.

5. Re-assemble the unit in opposite process from above.

REPLACE THE HUMIDISTAT & FAN SPEED SWITCH

1. Pull out the water tank, take out the filter, remove the front & rear plates.

2. Unfasten the wire terminals. 3. Take off the Electronic Cover (Part #110) and

loosen all relative screws.

4. Take off the defect humidistat or speed switch from Front Grill (Part #103).

5. Replace with a new one. 6. Re-assemble the unit in opposite process from

above. Notice ! Do not insert the wire terminals, knob, switch in the wrong position.

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CLEAN THE DUST ON THE EVAPORATOR & CONDENSER

1. Pull out the water tank, take off the filter, remove the front & rear plates.

2. Take off the up wind funnel & fan motor. 3. Use high pressure N2 to blow off the dust on the

evaporator and condenser.

4. Use water to clean the evaporator and condenser.

Notice ! Before you clean the evaporator and condenser with water, make sure the motor has been taken off. The electric part is not allowed to touch with water.

CLEAN THE COOLING SYSTEM

1. Pull out the water tank, take off the filter, remove the front & rear plates.

2. Using soldering iron to separate the capillary tube from the dryer.

3. Connect a repair valve (with pressure gauge) on the copper tube of the compressor.

4. Filling 0.8 ~ 1.0 Mpa N2 into the inlet of the fixing valve to clean the cooling system.

Notice ! Before soldering, you have to vacuum the unit completely.

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RELEASE THE REFIRGERANT 1 For the unit with recharging value, you can

discharge the refrigerant directly by the value.

2 For the unit without the value, please:

2.1 File the copper tube of the compressor. * Do not file the copper tube off completely, as long as there is an opening is enough.

2.2 Use a tongs to clamp the copper tube, the refrigerant will be released then.

Caution!

1. Whenever examine or replace the spare parts of Cooling system, it is strictly necessary to clean out the refrigerant

2. Never use air solder to solder the copper tube. And to prevent from danger, please proceed the releasing in a place with good ventilation and away from fire.

3. If you need to repair or replace the parts of the cooling system, please wait 10 minutes after the refrigerant is released. Please use a soldering iron to solder off the connection. *Please do not use file to open the tubes, otherwise, the system will be contaminated by small pieces of metal.

4. As long as the tubes is opened, please use a plastic film (such as plastic bag) to cover it immediately. However, if you will not re-assemble the parts in a short time, you should use a plastic bag to cover its opening instead, in order to keep it from contaminated completely.

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VACUUM & CHARGE THE REFRIGERANT

1. Take out the filter, remove the rear plate.

2. Connect the copper tube of compressor, quick coupler, fixing value, vacuum pump and refrigerant bottle. (Please refer to the drawing shown at right.)

3. Weigh the refrigerant amount by an electronic scale, write down the amount.

4. Open the valve A & B of the fixing valve. Close the valve of the refrigerant bottle, then open the vacuum pump.

5. After 20 – 30 minutes, when the vacuum density is higher than 133Pa, close the valve A of the fixing valve, then close the vacuum pump.

6. Open the valve of refrigerant bottle first, then open valve B of fixing valve slowly, the refrigerant will enter the cooling system then.

7. When the charging amount is equal to the amount mentioned in the rating label, close valve B of fixing valve and valve of refrigerant bottle immediately.

8. Tong the charging tube between the compressor and quick coupler completely. Notice! The charging tube must be closed completely, otherwise, the refrigerant will leak out.

9. Take off the quick coupler. Clamp the end of charging tube flat

10. Soldering the end of the charging tube (which you clamped it flat previously) to prevent it from leakage.

抽真空，充冷媒

HOW TO DETECT THE LEAKAGE OF REFRIGERANT?

1. Wipe the soap water of high density on the soldering parts of the cooling system and the other parts which are easy to have leakage.

2. The soap water will bubble when there is a leakage. Notice! When the leakage is found, do not solder it directly.

3. If no leakage is found by the soap water, it only means there is no major leakage on the cooling system. You may use a professional detector to detect it again.

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HOW TO ADJUST THE COOLING SYSTEM IS BLOCKED ?

1. Measure the temperature in front of & behind the dryer. If the temperature difference is too big, then it means the dryer is blocked. Please change it.

2. Check the capillary is cool or not. If it is cool partially, it means, the capillary is blocked partially. If the capillary is not cool at all, it means, the capillary is totally blocked.

HOW TO ADJUST THE REFRIGERANT IS TOO MUCH ?

1. Power consumption is much higher than the standard. 2. Working current is much higher than the standard. 3. Suction pressure is too high. 4. Thick ice forms on the evaporator. 5. Part of the condenser is hot. 6. Suction tube of the compressor is freezing. Notice ! Above judgement should be made under the standard condition or similar condition. HOW TO ADJUST THE REFRIGERANT IS INSUFFICENT OR HAS LEAKED ?

1. Power consumption is too low. 2. Working current is too small. 3. Suction pressure is too low. 4. Few ice or no ice on the evaporator. 5. Upper part of the condenser is warm, down part of the condenser is not warm. 6. Suction tube of the compressor is not cool. Notice ! Above judgement should be made under the standard condition or similar condition. HOW TO REPAIR THE DEFECT HEATER SET?

1. Take off the Rear Plate, loosen screws.

2. Take off defect Heater Set and replace new one.

3. Re-Assemble the unit in opposite process from above.

电热组

Heating set

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PROBLEMREPLACE THE COMPRESSOR