Vacuum Pump; Detecting Leaks - Impecca ISAH-1220A1/I Mode D'emploi

STEP 10: INSTALL DRAINAGE SYSTEM
1. Connect the outdoor drain joint to the corresponding hole on the unit chassis, as
pictured in the diagram below.
2. Connect the drain hose to the vent-side of the drain joint housing.

VACUUM PUMP

1. Remove the valve caps on the liquid valve and gas valve, as well as the refrigera-
tion charge vent nut.
2. Connect the charging hose of the piezometer to the gas valve of the charging vent.
Connect the other charging hose to the vacuum pump.
3. Open the piezometer completely and begin unit operation for 10–15 minutes. Ver-
ify that the pressure indicated on the piezometer remains at -0.1MPa.
4. Close off the vacuum pump and wait 1-2 minutes before verifying that the pres-
sure indicated on the piezometer remains at -0.1MPa. A pressure decrease may
indicate a leak.
5. Remove the piezometer and open the valve cores on both the liquid and gas valves.
6. Replace and fasten the screw caps and the refrigerant charging vent.

DETECTING LEAKS

• Method 1: use a leak detector
• Method 2: apply suds from soapy water to the hose circuit and watch several min-
utes for air bubbles.
drain vent
Drain hose
–18–
chassis
outdoor drain joint