Haier 4HP16 Installation Instructions Manual

507919-01Page 10 of 21Issue 1946A - Open both manifold valves and start the vacuum pump.B -NOTE - During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressureindicates a relatively large leak. If this occurs, repeat the leak testing procedure.NOTE - The term absolute pressure means the total actual pressure above absolute zero within a given volume or system. Absolutepressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.C - When the absolute pressure reaches 23,000 microns (29.01 inches ofmercury), perform the following:Close manifold gauge valves.Close valve on vacuum pump.Turn off vacuum pump.Disconnect manifold gauge center port hose from vacuum pump.Attach manifold center port hose to a nitrogen cylinder with pressureregulator set to 150 psig (1034 kPa) and purge the hose.Open manifold gauge valves to break the vacuum in the line set and indoorunit.Close manifold gauge valves.D - Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release thenitrogen from the line set and indoor unit.E - Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until theabsolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pumpand closing the manifold gauge valves.F - When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to acylinder of HFC-410A positioned to deliver liquid refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in theline set and indoor unit.G - Perform the following:Close manifold gauge valves.Shut off HFC-410A cylinder.Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with coretool while maintaining a positive system pressure.Replace stem caps and finger tighten them, then tighten an additional one-sixth (1/6) of a turn as illustrated.OUTDOORUNITTO VAPORSERVICE VALVETO LIQUID LINESERVICE VALVEMICRONGAUGEVACUUM PUMP1/4 SAE TEE WITH SWIVELCOUPLER500MANIFOLDGAUGE SETHFC-410ARECOMMENDMINIMUM 3/8” HOSEA - Connect low side of manifold gauge set with1/4 SAE in-line tee to vapor line service valveB - Connect high side of manifold gauge set toliquid line service valveC - Connect available micron gauge connectoron the 1/4 SAE in-line tee.D - Connect the vacuum pump (with vacuumgauge) to the center port of the manifoldgauge set. The center port line will be usedlater for both the HFC-410A and nitrogencontainers.HIGHLOW1234567891011 121/6 TURNNITROGEN3CONNECT GAUGE SETABCD4 EVACUATE THE SYSTEMNOTE - Remove cores from service valves (if not already done).Possible equipment damage.Avoid deep vacuum operation. Do not usecompressors to evacuate a system.Extremely low vacuum can cause internalarcing and compressor failure. Damagecaused by deep vacuum operation willvoid warranty.WARNING !EVACUATIONH - Open suction service valve first before liquid valve to release the unit charge into the system. Replace valvecaps and tighten (8 ft. lb.). Caps are the primary seal.Evacuate the line set and indoor unit until a slight vacuum is indicated on the micron gauge (approximately 23,000 microns or29.01 inches of mercury).NOTE - Positioncanister to deliverliquid refrigerant.