Operation Manual

V 11/15
24
APPENDICES
Piping configuration
1. Standard connecting tube length:5 m.
2. Minimum connecting tube length: 3 m.
3. Maximum connecting tube length and maximum height difference:
Capacity
Maximum
connecting tube
length
Maximum
height
difference
9000Btu/h
15 10
12000Btu/h
20 10
18000Btu/h
20 10
Warning! Note the additional charge on the data plate affixed to the outdoor unit.
Additional oil and refrigerant charging
• If the length of the connecting pipe is increased by 10 m compared to the standard length,
add 5 ml of refrigeration oil for every 5 m of pipe added.
• Method for calculating the amount of additional refrigerant charge (liquid pipe): amount of
additional refrigerant charge = additional length of liquid pipe x additional amount of
refrigerant charge per metre.
Connecting pipe diameter Additional refrigerant
Liquid pipe (mm) Gas pipe (mm) (g/m)
6.35 9.52 or 12.7
20
6.35 15.88
50
Procedure for extending the piping
N.B.:
Improper extension of piping is the main cause of refrigerant leaks. Proceed as shown below:
1. Cut the pipe
• Check the length of the pipe based on the
distance between the indoor unit and outdoor
unit.
• Cut the required pipe using a pipe cutter.
5. Expand the port
Expand the port using a pipe expander.