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5
• When piping work is completed, it is necessary to purge the air and check for gas leakage
WARNING
1) Do not mix any substance other than the specified refrigerant (R410A) into the refrigeration cycle.
2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
3) Refrigerants should always be recovered and never be released directly into the environment.
4) Use a vacuum pump for R410A exclusively. Using the same vacuum pump for different refrigerants may damage the vacuum pump or the unit.
• 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 5/32" (4mm) 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 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 subsequently requires no operation.)
3) Do vacuum pumping and make sure that the compound pressure gauge reads - 0.1MPa (- 760mmHg)*
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.)*
5) Remove valve caps from liquid stop valve and gas stop valve.
6) Turn 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 turn 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 49-1/4 ft (15 metres)
Run time
Not less than 10 min.
*2. If the compound pressure gauge pointer swings back, refrigerant may have water content or a loose pipe joint may exist.
Check all pipe joints and retighten nuts as needed, then repeat steps 2) through 4).
6
Check the type of refrigerant to be used on the machine nameplate.
Precautions when adding R410A
Fill from the liquid pipe in liquid form.
This is a mixed refrigerant, so adding it in gas form may cause the refrigerant composition to change, preventing normal
operation.
1) Before filling, check whether the cylinder has a siphon attached or not. (It should have something like "liquid filling
siphon attached" displayed on it.)
Filling a cylinder with an attached siphon
Stand the cylinder upright when filling.
There is a siphon pipe inside, so the cylinder
need not be upside-down to fill with liquid.
• Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.
PURGING AIR AND CHECKING GAS LEAKAGE
More than 49-1/4 ft (15 metres)
Not less than 15 min.
REFILLING REFRIGERANT
Compound
pressure gauge
Low-pressure
valve
Charging
hoses
2
Filling other cylinders
Turn the cylinder upside-down when filling.
1-14
Pressure meter
Gauge
Liquid
manifold
Valve
stop
High
caps
valve
pressure
valve
Vacuum pump Service port
.
1
Gas stop
valve
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