|
|
|
627333-A 5-49 HVAC Testing and Adjusting 1. Find refrigerant capacity for system. 2. Install high and low pressure hoses and purge hoses, refer to Testing and Adjusting, Manifold Gauge Set (Refrigerant) - Install. 3. Hand tighten charging hose from manifold gauge set directly to valve on refrigerant tank. Open valve on top of refrigerant tank to allow the flow of refrigerant through charging hose to manifold gauge set. 4. Loosen hose at manifold gauge set for two to three seconds and tighten connection, this will purge air from line. 5. Place refrigerant tank on scale so valve is at bottom. Check weight of tank. NOTE: A heater blanket may be required when charging an air conditioning system with a partially full refrigerant tank. 6. Open high pressure valve on manifold gauge set. This action allows liquid refrigerant to charge system through the high pressure side of compressor. 7. Check weight of refrigerant tank often as weight will decrease as refrigerant enters the system. When required amount of refrigerant (system capacity) has entered system, close valve and high pressure valve. Closing valves stops flow of refrigerant. For example, 1.8 kg (4 lb) of refrigerant has entered a system with 1.8 kg (4 lb) capacity. 8. For correct system operation, disconnect charging hose and conduct a performance check. |