Refrigerant Piping - Mitsubishi SCM45ZA User Manual

6.5.5 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.
Length for one indoor unit
Total length for all rooms
Lower installation spot of the indoor unit A
Height
Upper installation spot of the indoor unit B
difference
Maximum height difference of the indoor units C
Length of chargeless refrigerant pipe
* 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:
Class of indoor unit (kW)
Diameter of joint pipe
¡ Outdoor unit and the total connectable indoor units (class kW):
Model
SCM45ZA
SCM45YA
(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.
Liquid side service valve (ø6.35)
Service valve
for room A
Gas side service
valve (ø9.52)
¡
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
Indoor
Push
Remove
¡ Remove the flare nut (from both
liquid and gas sides).
*
2.2 · 2.5 · 2.8kW
Liquid side
Gas side
ø 9.52 · t 0.8
Total of indoor units (class kW)
6.5kW
6.5kW
ø6.35 pipe
4.0 kW class
Indoor unit
ø12.7 pipe
Copper packing Variable diameter joint (ø9.52–ø12.7)
Outdoor
Push
Remove
¡ Remove the flare nut (from both
liquid and gas sides).
Under 25m
Under 30m
A
Under 15m
Under 10m
Under 25m
B
20m
3.2 · 4.0kW
ø 6.35 · t 0.8
ø 12.7 · t 0.8
A
¡Fit the removed flare nut to the joint pipe, and then flare it.
ø9.52
Service valve
for room B
ø9.52
Service valve
for room A
Liquid Gas
Liquid Gas
side side
service service
valve valve
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
221
C