Refrigerant Piping SiE33-102
150 Installation Manual
6.6 Additional Refrigerant Charge
Caution Refrigerant may only be charged after performing the leak test and the vacuum drying. (See page 148)
When charging a system, care shall be taken that its maximum permissible charge is never exceeded, in
view of the danger of liquid hammer.
Charging with an unsuitable substance may cause explosions and accidents, so always ensure that the
appropriate refrigerant (R-22) is charged.
Refrigerant containers shall be opened slowly.
Always use protective gloves and protect your eyes when charging refrigerant.
To avoid compressor breakdown, do not change the refrigerant more than the specified amount to raise
the condensing pressure.
This outdoor unit is factory charged with refrigerant and depending on pipe sizes and pipe lengths some
systems require additional charging of refrigerant.
Determine the weight of refrigerant to be charged additionally referring to the item “Additional
refrigerant to be charged” in chapter “Example of connection”. And fill in the amount in the “Request for
the indication of additional refrigerant charging amount and installation date” attached to the unit.
After the vacuum drying is finished, charge the additional refrigerant in through the liquid stop valve
service port. Taking into account following instructions:
1. Check that gas and liquid stop valves are closed.
2. Stop the compressor and charge the specified weight of refrigerant.
RSXY24,26,28,30
Gas side valve
Liquid side valve
R-22
Tank
Measuring apparatus
Indoor units
Gas side
Connecting valve (Service port)
RXE (Sub unit)
Liquid side
RXY (Main unit)
RSXY16,18,20
Gas side valve
Liquid side valve
Gas side
Connecting valve (Service port)
RXE (Sub unit)
Liquid side
RXY (Main unit)
Indoor units
R-22
Tank
Measuring apparatus
(V1854)
Si33-102.book Page 150 Tuesday, June 26, 2001 3:18 PM
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