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Si33-102.book Page 34 Tuesday, June 26, 2001 3:18 PM
Installation
3.2.7 Additional Charge of Refrigerant
Operational steps
Use the length of the piping to
calculate the amount of
refrigerant required
Important points
1. The results of all calculations must be recorded. (Make a list.)
2. The refrigerant will need to be additionally charged whenever the distance between the outdoor unit
and the most distant indoor unit is more than 10m.
3. The additional charging operation should be carried out by input of liquid into the liquid pipes from a
charging cylinder following completion of the vacuum drying operation.
4. When the additional charging operation cannot be satisfactorily completed use the action of the
compressor to complete the additional charging during the test run.
3.2.8 Drain Pipe Work (Indoor)
Operational steps
Install indoor unit
Drain Pipe Gradient a) The drain pipe must be fitted at a gradient of at least 1/100.
and Support The drain pipe should be as short as possible and free from airlocks.
b) Suspension bolts should be used to support long stretches of drain pipe in order to ensure that a
gradient of 1/100 is maintained. (PVC pipes should not be bent)
Spacing of supports for horizontal piping
Class
Rigid PVC pipe
c) The lenght of pipe laid horizontally should be kept to a minimum.
34
Additional charge of
refrigerant
(V0995)
Check for water
Connect drain pipe
leaks
Nominal diameter Spacing
25~40mm 1~1.5m

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SiE33-102
Insulate drain pipe
(V0999)
General Information