Special Precautions When Dealing With R410A Unit - McQuay J Serie Montageanleitung

R410A is a new HFC refrigerant which does not
damage the ozone layer. The working pressure of this
new refrigerant is 1.6 times higher than conventional
refrigerant (R22), thus proper installation / servicing is
essential.
• Never use refrigerant other than R410A in an air
conditioner which designed to operate with R410A.
• POE oil is used as lubricant for R410A compressor,
which is different from the mineral oil used for R22
compressor. During installation or servicing, extra
precaution must be taken not to expose the R410A
system too long to moist air. Residual POE oil in the
piping and components can absorb moisture from the
air.
• To prevent mischarging, the diameter of the service port
on the flare valve is different from that of R22.
Purging The Piping And The Indoor Unit
Except for the outdoor unit which is pre-charged with refrigerant,
the indoor unit and the refrigerant connection pipes must be air-
purged because the air containing moisture that remains in the
refrigerant cycle may cause malfunction of the compressor.
• Remove the caps from the valve and the service port.
• Connect the center of the charging gauge to the vacuum
pump.
• Connect the charging gauge to the service port of the 3-way
valve.
• Start the vacuum pump. Evacuate for approximately 30
minutes. The evacuation time varies with different vacuum
pump capacity. Confirm that the charging gauge needle has
moved towards -760mmHg.
Caution
• If the gauge needle does not move to -760mmHg, be sure to
check for gas leaks (using the refrigerant detector) at flare
type connection of the indoor and outdoor unit and repair the
leak before proceeding to the next step.
• Close the valve of the charging gauge and stop the vacuum
pump.
• On the outdoor unit, open the suction valve (3 way) and liquid
valve (2 way) (in anti-clockwise direction) with 4mm key for
hexagon sacked screw.
Charge Operation
This operation must be done by using a gas cylinder and a
precise weighing machine. The additional charge is topped-
up into the outdoor unit using the suction valve via the service
port.
• Remove the service port cap.
• Connect the low pressure side of the charging gauge to the
suction service port center of the cylinder tank and close
the high pressure side of the gauge. Purge the air from the
service hose.
• Start the air conditioner unit.
• Open the gas cylinder and low pressure charging valve.
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SPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNIT

VACUMMING AND CHARGING
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• Use tools and materials exclusively for refrigerant
R410A. Tools exclusively for R410A are manifold valve,
charging hose, pressure gauge, gas leak detector, flare
tools, torque wrench, vacuum pump and refrigerant
cylinder.
• As an R410A air conditioner incurs higher pressure than
R22 units, it is essential to choose the copper pipes
correctly. Never use copper pipes thinner than 0.8mm
even though they are available in the market.
• If the refrigerant gas leakage occurs during installation
/ servicing, be sure to ventilate fully. If the refrigerant
gas comes into contact with fire, a poisonous gas may
occur.
• When installing or removing an air conditioner, do not
allow air or moisture to remain in the refrigerant cycle.
• When the required refrigerant quantity is pumped into the unit,
close the low pressure side and the gas cylinder valve.
• Disconnect the service hose from service port. Put back the
service port cap.
Allen key
Service port
Liquid side
Indoor Unit
Gas side
Open
Vacuum
Hi
pump
Low
Close
Liquid side
Indoor Unit
Gas side
Check
vale
Hi
Low
Close
1-10
Refrigerant piping
Flare nut
Outdoor unit 3 way valve
Outdoor Unit
Discharge valve
Close
Suction valve
Close
Outdoor Unit
Discharge valve
Open
Suction valve
Open
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