SERVICING
Moisture chemically reacts with the refrigerant and oil to form corrosive hydrofluoric and hydrochloric acids. These attack motor windings and parts, causing breakdown.
The equipment required to thoroughly evacuate the system is a high vacuum pump, capable of producing a vacuum equiva- lent to 25 microns absolute and a thermocouple vacuum gauge to give a true reading of the vacuum in the system
NOTE: Never use the system compressor as a vacuum pump or run when under a high vacuum. Motor damage could occur.
SCROLL COMPRESSORS
DO NOT FRONT SEAT THE SERVICE VALVE(S) WITH THE COMPRESSOR OPERATING IN AN ATTEMPT TO SAVE REFRIGERANT. WITH THE SUCTION LINE OF THE COMPRESSOR CLOSED OR SEVERLY RESTRICT- ED, THE SCROLL COMPRESSOR WILL DRAW A DEEP VACUUM VERY QUICKLY. THIS VACUUM CAN CAUSE INTERNAL ARCING OF THE FUSITE RESULTING IN A DAMAGED OR FAILED COMPRESSOR.
1.Connect the vacuum pump, vacuum tight manifold set with high vacuum hoses, thermocouple vacuum gauge and charg- ing cylinder as shown.
3.If the vacuum pump is working properly, close the valve to the vacuum thermocouple gauge and open the high and low side valves to the high vacuum manifold set. With the valve on the charging cylinder closed, open the manifold valve to the cylinder.
4.Evacuate the system to at least 29 inches gauge before opening valve to thermocouple vacuum gauge.
5.Continue to evacuate to a minimum of 250 microns. Close valve to vacuum pump and watch rate of rise. If vacuum does not rise above 1500 microns in three to five minutes, system can be considered properly evacuated.
6.If thermocouple vacuum gauge continues to rise and levels off at about 5000 microns, moisture and
7.Close valve to thermocouple vacuum gauge and vacuum pump. Shut off pump and prepare to charge.
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LOW SIDE
GAUGE
AND VALVE
800 PSI RATED HOSES
TO
UNIT SERVICE
VALVE PORTS
HIGH SIDE
GAUGE
AND VALVE
CHARGING
CYLINDER
AND SCALE
VACUUM PUMP
ADAPTER
VACUUM PUMP
USE REFRIGERANT CERTIFIED TO ARI STANDARDS. USED REFRIGERANT MAY CAUSE COMPRESSOR DAMAGE AND WILL VOID THE WARRANTY. MOST PORTABLE MACHINES CANNOT CLEAN USED REFRIGERANT TO MEET ARI STANDARDS.
OPERATING THE COMPRESSOR WITH THE SUCTION VALVE CLOSED WILL VOID THE WARRANTY AND CAUSE SERIOUS COMPRESSOR DAMAGE.
Charge the system with the exact amount of refrigerant. Refer to the specification section or check the unit nameplates for the correct refrigerant charge.
An inaccurately charged system will cause future prob- lems.
2.Start the vacuum pump and open the shut off valve to the high vacuum gauge manifold only. After the compound gauge (low side) has dropped to approximately 29 inches of vacuum, open the valve to the vacuum thermocouple gauge. See that the vacuum pump will
1.Using a calibrated set of refrigerant scales, allow liquid re- frigerant only to enter the high side.
2.After the system will take all it will take, close the valve on the high side of the charging manifold.
3.Start the system and charge the balance of the refrigerant through the low side.
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