Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 210 / 1106

208
SCM-HG (2 room)
5.5.5 Refrigerant Piping
(1) Limit
The maximum permissible length of the refrigerant pipes for the outdoor units, and the maximum permissible height difference for
the outdoor units are as shown below.
* If the total length for all the rooms exceeds the length of chargeless refrigerant
pipe, additionally charge with refrigerant according the item 4.
¡
The diameter of the refrigerant pipe:
¡
Outdoor unit and the total connectable indoor units (class kW):
Liquid side
Gas side
2.2 · 2.5 · 2.8kW
ø 9.52 · t 0.8
3.2 · 4.0kW
ø 12.7 · t 0.8
ø 6.35 · t 0.8
Class of indoor unit (kW)
Diameter of joint pipe
Model
SCM452HENG-L
SCM452CENG-L
Total of indoor units (class kW)
6.5kW
6.5kW
(2) Connection of refrigerant piping
¡
The service valve corresponding to each indoor unit is as illustrated in the right figure.
¡
Changing the gas side piping size
If the piping connection for the gas side of the outdoor unit does not match the piping size
of the indoor unit, use the parts provided for variable connections to make the joint.
Variable diameter joint (provided): ø9.52
→
ø12.7 (1 piece)
[Examples of use of variable diameter joints]
Connection of indoor unit of Class 4.0 to A unit.
¡
Securely fit the copper packing between the service valve and the variable diameter joint to prevent shifting.
¡
Cover the pipes with tape so that dust and sand do not enter the pipe until they are connected.
[Connection of pipes]
¡
When connecting the pipes to the outdoor unit, be careful about the discharge of fluorocarbon gas or oil.
¡
Make sure to match the pipes between the indoor unit and the outdoor unit with the correct service valves.
(1) Preparations
¡
Remove the flare nut (from both
liquid and gas sides).
¡
Remove the flare nut (from both
liquid and gas sides).
¡
Fit the removed flare nut to the joint pipe, and then flare it.
A dimensions
Liquid side:
ø 6.35: ø 9 ~ ø 9.5
Gas side:
ø 9.52: ø 13.2 ~ ø 14
ø 12.7: ø 16.2 ~ ø 17
Gas
Gas
side
service
valve
Liquid
Liquid
side
service
valve
Service valve
for room B
Service valve
for room A
ø9.52
ø9.52
ø6.35 pipe
ø12.7 pipe
Indoor unit
4.0 kW class
Liquid side service valve (ø6.35)
Gas side service
valve (ø9.52)
Copper packing Variable diameter joint (ø9.52–ø12.7)
Service valve
for room A
Indoor
Remove
Push
Outdoor
Remove
Push
90+0.5
˚
A
A
B
C
Length for one indoor unit
Total length for all rooms
Lower installation spot of the indoor unit A
Upper installation spot of the indoor unit B
Maximum height difference of the indoor units C
Length of chargeless refrigerant pipe
Height
difference
Under 25m
Under 30m
Under 15m
Under 10m
Under 10m
20m