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Pump Down Procedure (Continued)
Collecting Refrigerant in Refrigerant Vessel Before
Pump Down Operation
1
Prepare an exclusive rechargeable refrigerant vessel, scale and a manifold gauge.
2
Check the amount of refrigerant in the entire system.
3
Connect a refrigerant vessel to an outdoor unit and operated about 50% of the indoor unit in
cooling mode.
4
After 10 minutes of cooling operation, check the pressure on high pressure side with the manifold
gauge. If the pressure on the high pressure side is over 3.0 MPa (30.59 kgf/cm²),g reduce the
number of operating indoor unit to decrease the pressure below 3.0 MPa (30.59 kgf/cm²).
5
When the pressure becomes lower than 3.0 MPa (30.59 kgf/cm²) open the manifold gauge valve
which is connected to a liquid side. Then, open the valve on the refrigerant vessel for the refrigerant
to flow from the liquid side pipe to a vessel.
6
Check the weight difference with the scale. When desired amount of the refrigerant is collected
into the vessel, close the valve and remove the manifold gauge.
7
Make sure that the amount of the refrigerant in the vessel is about 50% of the entire system.
8
Measure the amount of refrigerant correctly to not exceed amount of collected refrigerant.
If the amount of refrigerant in the system exceeded the maximum allowable limit, reduce the
amount of the refrigerant by following the below instruction before pump down operation.
R410A
Refrigerant
vessel valve
Valve
Scale
Manifold gauge
Service valve
Outdoor unit
Gas side
Liquid side
Valve
RD060PHXEA_IM_E_32352A(2).indd 40
2010-07-26 ｿﾀﾈﾄ 2:20:05
