Daikin ALTHERMA HT Service Manual page 87

ESIE09-08B
Procedure: Charging while the outdoor unit is at a standstill
1. Determine the weight of refrigerant to be charged additionally.
2. After the vacuum drying is finished, open valve A (5) and charge the additional refrigerant in
 To avoid compressor breakdown. Do not charge the refrigerant more than the specified
Test Operation
Piping length is the one way length of gas or liquid piping whichever is the longest.
It is not necessary to charge additionally if the piping length is under 10 m.
If the piping length is over 10 m please determine the additional amount of refrigerant to be
charged using the table below.
Table: Additional charging of refrigerant <unit: kg>
Refrigerant piping length
3~10 m 10~20 m 20~30 m
(a) 0.54
(a) Additional charge not required
Complete recharging
In case complete recharging is required (after a leak, etc.), refer to the table below to
determine the necessary amount of refrigerant.
Before recharging, make sure to execute vacuum drying of the internal piping of the unit as
well. To do so, use the internal service port of the unit. Do NOT use the service ports located
on the stop valve, since vacuum drying can not be performed properly from these ports.
Outdoor units have 1 port on the piping. It is between the heat exchanger and the 4-
way valve.
Table: Total charging amount <unit: kg>
Refrigerant piping length
3~10 m 10~20 m 20~30 m
4.5 5.0
its liquid state through the service port on the liquid stop valve taking into account following
instructions:
- Turn on the power of the outdoor unit and indoor units.
- Check that gas and liquid stop valves are closed.
- Stop the compressor and charge the specified weight of refrigerant.
amount.
30~40 m 40~50 m
1.08 1.62 2.16
30~40 m 40~50 m
5.6 6.1 6.7
Test Operation
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