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7
Evacuating
After the piping has been connected to the indoor unit, you can
perform the air purge together at once.
AIR PURGE
Evacuate the air in the connecting pipes and in the indoor
unit using a vacuum pump. Do not use the refrigerant in
the outdoor unit. For details, see the manual of the vacuum
pump.
Be sure to use a vacuum pump with counter-fl ow prevention
function so that inside oil of the pump does not fl ow backward
into pipes of the air conditioner when the pump stops.
1. Connect the charge hose from the manifold valve to the
service port of the packed valve at gas side.
2. Connect the charge hose to the port of the vacuum pump.
3. Open fully the low pressure side handle of the gauge manifold
valve.
4. Operate the vacuum pump to start evacuating. Perform
evacuating for about 15 minutes if the piping length is 20
meters.
(15 minutes for 20 meters) (assuming a pump capacity
of 27 liters per minute) Then confi rm that the compound
pressure gauge reading is –101 kPa (–76 cmHg).
5. Close the low pressure side valve handle of the gauge
manifold valve.
6. Open fully the valve stem of the packed valves (both gas and
liquid sides).
7. Remove the charging hose from the service port.
8. Securely tighten the caps on the packed valves.
Using a vacuum pump
• Open the valve stem all the way out, but do not try to open it
beyond the stopper.
• Securely tighten the valve stem cap with torque in the following
table:
Packed valve handling precautions
mm4
Gas side
(Ø12.70 mm)
50 to 62 N·m
(5.0 to 6.2 kgf·m)
Gas side
(Ø9.52 mm)
30 to 42 N·m
(3.0 to 4.2 kgf·m)
Liquid side
(Ø6.35 mm)
16 to 18 N·m
(1.6 to 1.8 kgf·m)
Service port
9 to 10 N·m
(0.9 to 1.0 kgf·m)
Wiring Connection
1. Remove the valve cover from the outdoor unit.
2. Connect the connecting cable to the terminals as identifi ed
with their respective matched numbers on the terminal block
of indoor and outdoor unit.
3. When connecting the connecting cable to the outdoor unit
terminals, make a loop as shown in the installation diagram
of indoor and outdoor unit to prevent water coming in the
outdoor unit.
4. Insulate the unused cords (conductors) from any water
coming in the outdoor unit. Proceed them so that they do
not touch any electrical or metal parts.
Stripping length of the connecting cable
CAUTION
CAUTION
NOTE
: Connecting cable
• Wire type : More than H07RN-F or 245 IEC66
• Wrong wiring connection may cause some electrical parts
burn out.
• Be sure to comply with local cords on running the wire
from indoor unit to outdoor unit (size of wire and wiring
method, etc.).
• Every wire must be connected fi rmly.
• KEEP IMPORTANT 4 POINTS FOR PIPING WORK.
(1) Take away dust and moisture (inside of the connecting
pipes).
(2) Tighten the connections (between pipes and unit).
(3) Evacuate the air in the connecting pipes using a
VACUUM PUMP.
(4) Check gas leak (connected points).
Packed valve at liquid side
Service port (Valve core (Setting pin))
Packed valve at gas side
Vacuum
pump
Vacuum pump adapter for
counter-fl ow prevention
Charge hose
Handle Hi
(Keep full closed)
Manifold valve
Pressure gauge
Compound pressure gauge
Handle Lo
Charge hose
Connecting pipe
–101 kPa
(–76 cmHg)
75 mm
10 mm
10 mm
65 mm
1(L)
2(N)
Terminal block
Terminal screw
Earth line
Connecting cable
Earth
line
Cord clamp
Screw
Flare nut
Use a torque wrench to tighten.Use a wrench to secure.
Externally
threaded side
Internally
threaded side
Half union
The hexagon wrench
is required.
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