valutazioni - 2, GPA: 3.5 ( )

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Close valves A and B, and observe vacuum gauge for a few minutes. A rise in pressure would indicate a possible leak or moisture remaining in the system. With valves A and B closed, stop the vacuum pump. 4) Remove the hose from the vacuum pump and place it on the charging cylinder. See Figure 22B. Open valve C. Discharge the line at the manifold connection. 5) The system is now ready for final charging. 7. Recharge as follows : 1) Refrigeration cycle systems are charged from the High-side. If the total charge cannot be put in the High-side, the balance will be put in the suction line through the access valve which you installed as the system was opened. 2) Connect the charging cylinder as shown in Figure 22B. With valve C open, discharge the hose at the manifold connection. 3) Open valve A and allow the proper charge to enter the system. Valve B is still closed. 4) If more charge is required, the high-side will not take it. Close valve A. 5) With the unit running, open valve B and add the balance of the charge. a. Do not add the liquid refrigerant to the Low- side. b. Watch the Low-side gauge; allow pressure to rise to 30 lbs. c. Turn off valve B and allow pressure to drop. d. Repeat steps B and C until the balance of the charge is in the system. 6) When satisfied the unit is operating correctly, use the pinch-off tool with the unit still running and clamp on to the pinch-off tube. Using a tube cutter, cut the pinch-off tube about 2 inches from the pinch-off tool. Use sil-fos solder and solder pinch-off tube closed. Turn off the unit, allow it to set for a while, and then test the leakage of the pinch-off connection. NOTE: THE REFRIGERANT R134a IS USED SOME MODELS. CHECK THE SPECIFICATION LABEL ON THE CABINET. When discharging refrigerant R134a, purging instrument should be used only for R134a, without mixing that of refrigerant R22. When checking the leakage of refrigerant R134a, leakage test tool should be used only for R134a. The pump for discharging should be high efficiency. Final discharging value must be managed below 0.5 Torr. Maximum water should be less than quantity 150mg in the cycle-all tubes and H/E assembly-system. If water quantity is over 150mg, it causes acid or corrosion in the cycle system and the capillary tube to be clogged by water and harmful materials. The model charged the refrigerant R134a should be used dryer to prevent water from overflowing. —15— —16— Equipment needed: Vacuum pump, charging cylinder, manifold gauge, brazing equipment. pinch-off tool capable of making a vapor-proof seal, leak detector, tubing cutter, hand tools to remove components, service valve. B A COMPRESSOR COMPOUND GAUGE MANIFOLD GAUGE SEE INSETS BELOW B A COMPRESSOR EXTERNAL VACUUM PUMP CHARGING CYLINDER LOW HI CAPILLARY TUBE COMPOUND GAUGE MANIFOLD GAUGE SEE INSETS BELOW A B A B C CONDENSER ASSEMBLY (HIGH PRESSURE SIDE) EVAPORATOR ASSEMBLY (LOW PRESSURE SIDE) CONDENSER ASSEMBLY (HIGH PRESSURE SIDE) EVAPORATOR ASSEMBLY (LOW PRESSURE SIDE) CAPILLARY TUBE Figure 22A-Pulling Vacuum Figure 22B-Charging 4. TROUBLESHOOTING GUIDE Problem Dehumidifier does not start. Dehumidifier does not dry the air as it should. Ineffective dehumidifying Possible Causes The dehumidifier is unplugged. The fuse is blown/circuit breaker is tripped. Water has reached its preset level. Bucket is not in the proper position and light is on. Check if wiring loose or fails. The control may not be set high enough. Room temperature is too low. Airflow is restricted. Doors and windows may not be closed tightly. Clothes dryer may be blowing moisture-laden air into the room. Check for gas leakage at heat exchange and connecting tube. Check if the air filter are clogged with dust. Remedy Make sure the dehumidifier's plug is pushed completely into the outlet. Check the house fuse/circuit breaker box and replace the fuse or reset the breaker. Empty the bucket and replace properly. Make sure the slots on both sides of the bucket are positioned correctly. Replace wiring. Turn the Humidity Control knob to a higher number. Moisture removal is best at higher room temperatures. Lower room temperatures will reduce the moisture removal rate. This unit is designed to be operated at temperatures above 65°F(18°C) Make sure there are no curtains, blinds or furniture blocking the front or back of the dehumidifier. Check that all doors, windows and other openings are securely closed. Install the dehumidifier away from the dryer. The dryer should be vented to the outside. Repair gas leak. Clean the air filter. Noise Check if the unit is securely positioned. Set and use the dehumidifier at a sturdy, flat, and level place. —17— CONDITION CAUSE REMEDY 1. Dehumidifier does not start. (Both compressor and fan motor do not operate.) No power Check power supply at outlet. Correct if none. Poor plug contact at outlet. Install plug properly or replace it. Bucket is full. If Auto Shut Off lights, empty the bucket and replace properly. Humidity control is at Off position...

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