96
(4)
Additional refrigerant charge
(a)
When the total refrigerant pipe length for all the rooms exceeds the length of the uncharged pipe (40m), additional
refrigerant is required.
(If 40m 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.
*1: Charge amount at the time of shipment.
*2: Maximum charge amount of the refrigerant (additional charge of 400g on site).
(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
Finish and fixing
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.
Open
Open
Vacuum pump
Charge hose
Charge hose
Handle Lo
Handle Hi
Manifold
valve
Pressure
gauge
Compound
pressure
gauge
-0.1 MPa
(-76cmHg)
Model
SCM80ZA
Charged pipe length
(Amount of uncharged
refrigerant) *1
40m (2600g)
Maximum total pipe length for all rooms
(Maximum amount of refrigerant) *2
60m (3000g)
On site additional charge
20g/m
Position so
the slit
comes on top.
Vinyl tape
Cover the joint with
insulation material
for the indoor unit
and tape it.
Tapping screw
Drain hose
Exterior tape
Crossover wires
Pipes
Pipe clamp
Apply exterior tape and shape along
the place where the pipes will be rout-
ed. Secure to the wall with a pipe
clamp. Be careful not to damage the
pipes and the wires.
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