Outdoor Unit
4.
Purging air and checking gas leakage
it,
WARNING-----------------------
• Make sure that air or any matter other than refrigerant (R32) does not get into the refrigeration cycle.
• If refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
• To prevent air pollution, a vacuum pump should be used for air purging wherever possible.
• If using additional refrigerant, purge the air from the refrigerant pipes and
indoor unit using a vacuum pump, then charge additional refrigerant.
• Use a hexagonal wrench to operate the stop valve rod.
• All
refrigerant pipe joints should be tightened with a torque wrench to the
specified tightening torque.
1) Connect projection side (on which pin is pressed) of charging hose (which comes from gauge
manifold) to gas stop valve's service port.
2) Fully open gauge manifold's low-pressure valve (Lo) and completely close its high-pressure valve (Hi).
(High-pressure valve will require no further operation.)
3) Begin vacuum pumping and make sure that the compound pressure gauge reads --0.1 MPa (-76cmHg) *1.
4) Close the gauge manifold's low-pressure valve (Lo) and stop vacuum pumping.
(Maintain this condition for a few minutes to make sure that the compound pressure gauge pointer
does not swing back.) *2.
5) Remove the valve caps from the liquid stop valve and gas stop valve.
6) Turn the liquid stop valve's rod 90
°
counter-clockwise with a hexagonal wrench to open valve.
Close it after 5 seconds, and check for gas leakage.
Using soapy water, check for gas leakage from indoor unit's flare and outdoor unit's flare and valve rods.
After the check is complete, wipe all soapy water off.
7) Disconnect charging hose from the gas stop valve's service port, then fully open the liquid and gas stop valves.
(Do not attempt to turn the valve rod further than it can go.)
8) Tighten the valve caps and service port caps for the liquid and gas stop valves with a torque wrench
to the specified torques.
*1. Pipe length vs. vacuum pump run time
Pipe length I Up to 15m
More than 15m
*2. If the compound pressure gauge pointer swings back, the
refrigerant may have water content or there may be a
loose pipe joint. Check all pipe joints and retighten nuts as
needed, then repeat steps 2) through 4).
Run time I At least 1 O min.
At least 15 min.
5.
Wiring
it,
WARNING---------------
Never use short cables for connecting end of conductor to each other.
• For inter-unit wiring, refer to
"4. Wiring"
in the section
"Indoor Unit".
• Regarding the inter-unit wire
and power supply wire.
• When connecting the inter-unit wire to the terminal block
using a single core wire, be sure to curl the end of the lead.
Improper work may cause heat and fire.
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Stripping wire at terminal block
• Precautions to be taken for power supply wiring. When using
stranded wires, make sure to use the round crimp-style
terminal for connection to the power supply terminal block.
Place the round crimp-style terminals on the wires up to the
covered part and secure in place.
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Precautions to be taken for power supply wiring. When using starnded wires,
/ Flat washer
Screw
� Rou�d crimp-style
terminal
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Screw
Compound
Pressure meter
pressure gauge
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Gauge
----.j
manifold L'i>
l
Low-
High-
I I
Liquid
pressure
caps stop
valve
Charging
hoses
Vacuum pump
Service port valie
Round crimp
style terminal
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Stranded wire
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Round crimp-style terminal
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Arrow view A
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Screw
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�- Round crimp-style
terminal
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6. Drain work
• If the drain port is covered by a mounting base or floor surface, place additional foot bases of at least 30mm in
height under the outdoor unit's feet.
10
