Floor Standing MFM
DM16-01.01.25en
Service manual
18
6.3 Refrigerant pipe connection
6.3.1 Pipe length and the elevation
The correct refrigerant quantity filled in the 5-meter-long pipe of the outdoor unit is marked on the
Product Data Plate. If you have to use longer pipe for every meter plus pipe, the refrigerant should
be added according to the following calculation.
Capacity
Btu/h
Pipe size
Standard
length
(m)
Max.
Elevation
B (m)
Max.
Length
A (m)
Additional
refrigerant
(g/m)
Gas
Liquid
MFM-24ARN1-Q
5/8’’
(Ф15.9)
3/8’’
(Ф9.52)
5
15
25
30
MFM-48ARN1-RB6W
3/4’’ (Ф19)
1/2’’
(Ф12.7)
5
30
50
65
MFM-60ARN1-R
3/4’’(Ф19)
1/2’’
(Ф12.7)
5
30
50
65
Caution:
Capacity is based on standard length and maximum allowance length is base of reliability.
Oil trap should be installed per 5-7 meters.
6.3.2 Piping connection
6.3.2.1 Connecting Of Refrigerant Pipe
a) Only the correctly installing of indoor and outdoor unit done, can the refrigerant pipe be
connected.
b) The cut-off valves are completely close before ex-work. Before connecting the refrigerant pipe,
be careful to check whether the valves are completely close.
c) The connecting procedure of refrigerant pipe: first, unscrew the two valves on the outdoor unit
and the pipe-jointing nut on the indoor unit(please keep them care- fully). Please connect the
refrigerant pipe according to the manual, the pipe-jointing nut should be screw tightly and no
leakage. Note: you need two wrenches to make balance.
d) When the connecting of refrigerant pipe is finished, before power on the system, you should
