Outdoor Unit
Purging Air And Checking Gas Leakage
� WARNING----------------------
• Do not mix any substance other than the specified refrigerant (R32) into the refrigeration cycle.
• When 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, perform air purging 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 at 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.
Compound
Pressure meter
pressure gauge /
Gauge
manifold
Low-
Charging
hoses
Liquid
stop
valve
Vacuum pump
Service port
Gas
stop
valve
2) Fully open gauge manifold's low-pressure valve (Lo) and completely close its high-pressure valve (Hi).
(High-pressure valve subsequently requires no operation.)
3) Do vacuum pumping and make sure that the compound pressure gauge reads -0.1MPa (-76cmHg) *1.
4) Close gauge manifold's low-pressure valve (Lo) and stop vacuum pump.
(Keep this state for a few minutes to make sure that the compound pressure gauge pointer does not swing back.) *2.
5) Remove valve cap from liquid stop value and gas stop valve.
6) Tum the liquid stop valve's rod 90 degrees counterclockwise 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 gas stop valve's service port, then fully open liquid and gas stop valves. (Do not attempt to tum valve rod beyond its stop.)
8) 'Tighten valve caps and service port caps for the liquid and gas stop valves with a torque wrench at the specified torques.
*1. Pipe length vs. vacuum pump run time
Pipe length Up to 15m
I
More than 15m
Run time
Not less than 10 min. Not less than 15 min.
I
•2. If the compound pressure gauge pointer swings back,
refrigerant may have water content or a loose pipe Joint
may exists. Check all pipe joints and retighten nuts as
needed, then repeat steps2) through4).
Wiring
• For inter-unit wires connections, see ( INDOOR UNIT)
1
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WIRING).
Tenninsl
block
• When connecting the connection wires to the terminal block using a single core wire, be sure to perform rurtlng.
Wire
retainer
• Regarding the interconnecting
and power cables.
� WARNING ---
Never use short cables for
connecting end of conductor to
each other.
Drain Work
Problems with the work may cause heat and fres.
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Stripping wire at tennlnel block
• Precaution to be taken for power supply wiring.
• When using stranded wires, make sure to use a round aimp--sty{e tem1inal for connection to
the power supply tenninel block. Place the rwnd aimp-&tyle tenninels on the wires up to
the oovered part and oecure in place.
1) Use the@draln socket for drainage.
2) When attaching the@draln socket to the bottom frame, make sure the connect the drain hose to the drain socket first.
3) If the drain port is covered by a mounting base or floor surface, place additional loot bases of at lease! 30mm in height under the outdoor untt's feet.
4) In cold areas, do not use a drain hose with outdoor unit. (Drain water may freeze. impainng heating performance.)
Strip wire end to this point.
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Roundaimp
&tyle terminal
Stranded wire
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