21
6.4 Air purging with vacuum pump
Air and moisture in the refrigerant system have undesirable effects as below:
●
Pressure in the system rises.
●
Operating current rises.
●
Cooling or heating efficiency drops.
●
Moisture in the refrigerant circuit may freeze and block capillary tubing.
●
Water may lead to corrosion of parts in the refrigerant system.
Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested and
evacuated to remove gas and moisture from the system.
Air purging with vacuum pump
(Indoor unit)
(Liquid side)
(Gas side)
Vacuum
pump
Vacuum
pump
adaptor
Lo
Hi
Handle Hi
Two-way valve
Close
Manifold valve
Compound meter
Pressure
gauge
-76cmHg
Handle Lo
Charge hose
Charge hose
(Outdoor unit)
Close
Three-way valve
Procedure
1. Completely tighten the flare nuts of the indoor and outdoor units, connect the manifold valve
charge.
2. Connect the charge hose connection to the vacuum pump.
3. Fully open the handle Lo of the manifold valve.
4. Operate the vacuum pump to evacuate. After starting evacuation, slightly loose the flare nut of the
Lo valve on the gas pipe side and check the air is entering. (Operation noise of the vacuum pump
changes and a compound meter indicates 0 stead of minutes)
5. After the evacuation is complete, fully close the handle Lo valve of the manifold valve and stop the
operation of the vacuum pump. Make evacuation for 15 minutes or more and check the compound
meter indicates -76cmHg.
Summary of Contents for R ON-OFF series
Page 1: ...SPLIT WALL MOUNTED TYPE R ON OFF SERIES...
Page 8: ...6 2 Function...
Page 11: ...9 3 Dimension 3 1 Indoor Units Figure 1 Figure 2...
Page 14: ...12 4 Refrigerant Cycle Diagram For heat pump models...
Page 15: ...13 5 Wiring Diagram 5 1 Indoor Units KSR1 07HRN1 QC2 A KSR1 09HRN1 QC2 A KSR1 18HRN1 QB8...
Page 16: ...14 KSR1 21HRN1 QB8W KSR1 21CR QB6W KSR1 21HR QB6W KSR1 24HRN1 QB8W...
Page 17: ...15 5 2 Outdoor Units KOK1 07HN1 QC2 KOA1 09HN1 QC2...
Page 18: ...16 KOE 18HN1 QB8...
Page 19: ...17 KOF 21HN1 QB8W K0F2 21C QB6W KOP 21H QB6W...
Page 20: ...18 KOF2 24HN1 QB8W...