–
47
–
9-3-8. Evacuating
After the piping has been connected to all indoor
unit(s), you can perform the air purge together at
once.
AIR PURGE
Evacuate the air in the connecting pipes and in
the indoor unit using vacuum pump.
Do not use the refrigerant in the outdoor unit.
For details, see the manual of vacuum pump.
Use a vacuum pump
Be sure to use a vacuum pump with counter-flow
prevention function so that inside oil of the pump
does not flow backward into pipes of the air condi-
tioner when the pump stops.
(If inside oil of the vacuum pump enters into the air
conditioner which adopts R410A, a trouble of the
refrigeration cycle may be caused.)
1. Connect the charge hose from the manifold valve
to the service port of the gas side packed valve.
2. Connect the charge hose to the port of vacuum
pump.
3. Open fully the low pressure side handle of the
gauge manifold valve.
4. Operate the vacuum pump to start for evacuating.
Perform evacuating for about
1
5 minutes if the
piping length is total
2
0 meters. (
1
5 minutes for
total
2
0 meters) (assuming a pump capacity of 27
liters per minute.)
Then confirm that the compound pressure gauge
reading is –101 kPa ( –76 cmHg).
5. Close the low pressure side valve handle of
gauge manifold.
6. Open fully the valve stem of the packed valves
(both sides of Gas and Liquid).
7. Remove the charging hose from the service port.
8. Securely tighten the caps on the packed valves.
Fig. 9-3-12
Packed valve handling precautions
• Open the valve stem all the way out ; do not try to
open it beyond the stopper.
• Securely tighten the valve stem cap in torque is as
follows :
Gas side (Ø12.7 mm)
Gas side (Ø9.52 mm)
Liquid side (Ø6.35 mm)
Service port
50 to 62 N•m (5.0 to 6.2 kgf•m)
33 to 42 N•m (3.3 to 4.2 kgf•m)
14 to 18 N•m (1.4 to 1.8 kgf•m)
14 to 18 N•m (1.4 to 1.8 kgf•m)
Hexagonal wrench is required.
Fig. 9-3-13
9-3-9. Electrical Work
For the air conditioner that has no power cord,
connect a power cord to it as mentioned below.
Power supply
Maximum running current
Installation fuse rating
Power cord
220 – 240 V
Single phase 50/60 Hz
1
1
A
1
5 A
How to wire
1. Connect the connecting cable to the terminal as
identified with their respective matched numbers
on the terminal block of indoor and outdoor unit.
(1.0 mm
2
AWG 18
or more)
2. When connecting the connecting cable to the
outdoor unit terminal, prevent water coming in the
outdoor unit.
3. Insulate the unused cords (conductors) stripped
the sheath of connecting cable with PVC tape.
Process them so that they do not touch any
electrical or metal parts.
4. For inter-unit wiring, do not use a cut wire jointed
to another on the way.
Use wires long enough to cover the entire length.
Compound pressure gauge
Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
(For R410A only)
Vacuum pump adapter
for counter-flow prevention
(For R410A only)
Packed valve at liquid side
Packed valve at gas side
Service port
(Valve core (Setting pin))
Connecting
pipe
Handle Lo
Charge hose
(For R410A only)
-101kPa (-76cmHg)
Vacuum
pump
B
A
2,0 mm
2
(AWG-14) or more
Summary of Contents for RAS-3M23YACV-E
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Page 80: ... 80 CN600 MCC 758 ...
Page 81: ... 81 MCC 775 ...
