11
Outdoor Unit
Installation Manual
6. Tighten all the caps on the valves securely, then perform a gas leak
inspection.
• The cap with the 9.52 mm outer diameter is available in two sizes in
accordance with the type of packed valve for which the cap is used.
The tightening torque depends on the width across
fl
ats of the cap so
check it in the table below.
Service valve
Tighten torque
Valve stem cap
Service port cap
mm
N•m
kgf•m
N•m
kgf•m
Liquid side
(9.52)
H19 mm
14 to 18
1.4 to 1.8
̶
̶
H22 mm
33 to 42
3.3 to 4.2
Gas side (12.7)
33 to 42
3.3 to 4.2
14 to 18
1.4 to 1.8
Compound pressure gauge
Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
Service valve at
the liquid side
Vacuum pump adapter
for counter-
fl
ow
prevention
–101 kPa (–76 cmHg)
Charge hose
Service port
(Valve core (Setting pin))
Service valve at the gas
side
Handle Low
Vacuum pump
7
Charging Refrigerant
• You need not add refrigerant if the piping length is 40 m or less.
• If the length exceeds 41 m, add 20 g of refrigerant per 1 meter over.
Procedure to Charge Refrigerant
After extraction is complete, close the valves, then charge the refrigerant.
• Make sure that no operations are in progress while charging the
refrigerant.
If you cannot charge the refrigerant fully, add it from the service port of
the service valve at the gas end while cooling operation is in progress.
NOTE
• Charge the refrigerant in a liquid state.
• If you charge the refrigerant in a gas state, the air conditioner will not
operate properly since the refrigerant undergoes a change in its composition.
Precautions for Adding Refrigerant
• Use a scale with a precision of at least 10 g per index line when adding
the refrigerant.
Do not use bathroom scales or similar instruments.
• Use liquid refrigerant when re
fi
lling.
Since the refrigerant is in liquid form, it can
fi
ll up quickly.
Therefore add the refrigerant gradually.
7
Insulation of the Refrigerant Pipes
• Insulate the refrigerant pipes for liquid and gas separately.
Underground piping: 10t
(Laying the pipes on the wall,
ceiling, or under the
fl
oor)
Heat-proof bubble polyethylene
7
Gas Leak Inspection
• Perform a gas leak inspection for the
fl
are nut connections, valve stem
connection, and service port cap without fail.
• Use a leak detector exclusively manufactured for R32.
Flare nut connections
(Indoor unit)
Flare nut connections
(Outdoor unit)
Service port cap
connection
Valve stem cap
connection
* Check point example (RAS-5M34U2AVG-E)
7
Performing Additional Installation of an Indoor Unit
1. Collect refrigerant from the outdoor unit.
2. Turn off the circuit breaker.
3. Perform additional installation referring to the procedure from “Refrigerant
Piping Connection” on the previous page.
7
Pump-down Operation (Recovering refrigerant)
CAUTION
Since the forcible running for collecting
refrigerant stops automatically after 10
minutes,
fi
nish collecting refrigerant within
10 minutes.
Electric current is applied on the
control board. Beware of electric
shock.
• The following must be certainly done
during pump down.
• Do not incorporate air into the
refrigeration cycle.
• Close the 2 service valves. Stop the
compressor and remove the refrigerant
pipe.
If the refrigerant pipe is removed when
the compressor is operating and service
valves are opened, the refrigerant cycle
will inhale unwanted matter such as air
and the pressure in the cycle becomes
abnormally elevated. It may cause a
burst or injury.
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