Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 158

SCM-HG (4 room)
Procedure
1 Secure all flare nuts on both indoor and outdoor sides to prevent leaks from the
pipes.
2 Connect the service valves, charge hose, manifold valve and vacuum pump as
shown in the right figure.
3 Fully open the handle Lo for the manifold valve, and pump a vacuum for 15
minutes. Ensure that the meter is indicating -0.1 MPa (-76cmHg).
4 After vacuuming, fully open the operational valve (both liquid and gas sides)
with a hexagon wrench.
5 Ensure that there are no gas leaks from the joints in the indoor and outdoor units.
6 Repeat the above steps 1 ~ 5 for all connected indoor units.
(4) Additional refrigerant charge
(a) When the total refrigerant pipe length for all the rooms exceeds the length of the uncharged pipe (50m), additional
refrigerant is required.
(If 50m or less, additional charge is not required.)
(b) For this multi type room air conditioner, it is not necessary to charge the refrigerant for the total maximum length in all the
rooms.
Model
SCM802HENG-L
SCM1002HENG-L
(c) Ensure that there are no gas leaks from the pipe joints by using a leak detector or soap water.
(5) Heat insulation for joint
Heat insulation for joints
Cover the joint with
insulation material
Vinyl tape
for the indoor unit
and tape it.
156
Charged pipe length
(Amount of uncharged
refrigerant) *1
50 (3700)
*1: Charge amount at the time of shipment.
*2: Maximum charge amount of the refrigerant (additional charge of 300g on site).
Finish and fixing
Position so
the slit
comes on top.
Charge hose
On site additional charge
20g/m
Pipe clamp
Apply exterior tape and shape along
Pipes
the place where the pipes will be rout-
Crossover wires
ed. Secure to the wall with a pipe
Exterior tape
clamp. Be careful not to damage the
Drain hose
pipes and the wires.
Tapping screw
Compound Pressure
pressure gauge
gauge
Manifold
valve
-0.1 MPa
(-76cmHg)
Handle Hi
Handle Lo
Charge hose
Vacuum pump
Open
Open
Maximum total pipe length for all rooms
(Maximum amount of refrigerant) *2
80m (4300)