Samsung RD040MHXCA Series Installation Manual page 34

C I
OMPLETING THE NSTALLATION
Pump Down Procedure (Continued)
34
E-
FJM RD040MHXCA_IM_00000_E_2.23.10.indd 34
Collecting Refrigerant in Refrigerant Vessel Before
Pump Down Operation
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.
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 a 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 30kg/cm ,g(426.7psig) reduce the number of operating indoor unit to
2
decrease the pressure below 30kg/cm
5 When the pressure becomes lower than 30kg/cm
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 desire amount of the
refrigerant is collected on 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.
R410a Refrigerant
vessel valve
Valve 
Valve 
Scale
,g(426.7psig).
2
,g(426.7psig) open the
2
Outdoor unit
Liquid side
Gas side
Manifold gauge Service valve
2010-2-24 19:57:44