Installation
SiE33-102
34
General Information
3.2.7
Additional Charge of Refrigerant
Operational steps
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
Drain Pipe Gradient
and Support
a) The drain pipe must be fitted at a gradient of at least 1/100.
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
c) The lenght of pipe laid horizontally should be kept to a minimum.
Use the length of the piping to
calculate the amount of
refrigerant required
Additional charge of
refrigerant
(V0995)
Insulate drain pipe
Install indoor unit
Connect drain pipe
Check for water
leaks
(V0999)
Class
Nominal diameter
Spacing
Rigid PVC pipe
25~40mm
1~1.5m
Si33-102.book Page 34 Tuesday, June 26, 2001 3:18 PM
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