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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)
*1
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 step 3) through 5).
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
REFILLING REFRIGERANT
Compound
pressure gauge
Low-pressure
valve
Charging
hoses
Filling other cylinders
Turn the cylinder upside-down when filling.
1-11
Pressure meter
Gauge
Liquid
manifold
Valve
stop
High
caps
valve
pressure
valve
Vacuum pump Service port
Gas stop
valve
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