Service port
(Valve core (Setting pin))
Service valve at the gas
side
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 .
Compound pressure gauge
–101 kPa (–76 cmHg)
Handle Low
Charge hose
Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
Vacuum pump adapter
for counter-flo
prevention
Vacuum pump
Service valve at
the liquid side
• 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 refilling
Since the refrigerant is in liquid form, it can fill up quickl .
Therefore add the refrigerant gradually.
Insulation of the Refrigerant Pipes
• Insulate the refrigerant pipes for liquid and gas separately.
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.
Precautions for Adding Refrigerant
Heat-proof bubble polyethylene
NOTE
Underground piping: 10t
(Laying the pipes on the wall,
ceiling, or under the floor
• Charge the refrigerant in a liquid state
• If you charge the refrigerant in a gas state, the air conditioner will no
operate properly since the refrigerant undergoes a change in its composition.
Gas Leak Inspection
• Perform a gas leak inspection for the 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)
Service port cap
connection
Valve stem cap
connection
Flare nut connections
(Outdoor unit)
* Check point example (RAS-5M51U2ACVG-SG)
Performing Additional Installation of an Indoor Unit
1. Collect refrigerant from the outdoor unit.
2. Turn off the circuit breake .
3. Perform additional installation referring to the procedure from “Refrigerant
Piping Connection” on the previous page.
CAUTION
•
•
•
Use a circuit breaker of a type that is not
tripped by shock waves.
Incorrect/incomplete wiring will cause
electrical fires or smoke
Prepare the power source for exclusive
use with the air conditioner.
• This product can be connected to the main
power.
Fixed wire connections:
A switch that disconnects all poles and
has a contact separation of at least 3 mm
must be incorporated into the fixed wiring
12-2-7. Electrical work
WARNING
• Be sure to comply with local regulations/
codes when running the wire from the
outdoor unit to the indoor unit.
(Size of wire and wiring method etc.)
• A lack of electrical capacitance or incorrect
wiring may cause an electric shock or a
fire
• To make sure that the wiring connection
are secure, use designated cables.
•
•
Fix the cables securely so that no external
force applied to the cables may effect th
terminals.
If wiring connections are incomplete or
cables are not fixed securel , it may cause
a fire
• Be sure to ground the outdoor unit.
• Incomplete grounding may lead to an
electric shock.
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