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Ensure that the colors of wires on the outdoor unit and the terminal markings are the same as the indoor unit
respectively.
SPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNIT
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 condi-
tioner 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.
SPECIAL PRECAUTIONS WHEN DEALING WITH R407C UNIT
•
R407C is a zeotropic refrigerant mixture which has zero
ozone depletion potential and thus conformed to the
Montreal Protocol regulation. It requires Polyol ester oil
(POE) oil for its compressor's lubricant. Its refrigerant
capacity and performance are about the same as the
refrigerant R22.
•
POE oil is used as lubricant for R407C 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 R407C system too long to moist
air. Residual POE oil in the piping and components can
absorb moisture from the air.
•
Refrigerant R407C is more easily affected by dust of
moisture compared with R22, make sure to temporarily
cover the ends of the tubing prior to installation.
•
No additional charge of compressor oil is permitted.
Purging The Piping And The Indoor Unit
Except the outdoor unit which is pre-charged with
refrigerant, the indoor unit and the refrigerant connection
pipes must be air purged because the air that contain moisture
remaining in the refrigerant cycle may cause malfunction to
the compressor.
The outdoor unit is equipped by two 3 ways refrigerating
connecting valves. The suction valve is the larger one while
the small one is the liquid valve. Both valves are supplied
with service port valve for connection to a manometer.
• Remove the caps from the valve and the service port.
• Connect the center manifold gauge with the vacuum pump.
• Connect the manifold gauge to the service port of the 3
ways valve.
• Start the vacuum pump. Check the low pressure manifold
gauge until it indicate 0.9 bar. The evacuation time varies
with each vacuum pump capacity but generally in half an
hour.
All manuals and user guides at all-guides.com
! Caution
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PURGING THE REFRIGERANT PIPING
1-9
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 cor-
rectly. 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.
No other refrigerant other than R407C.
Tools specifically for R407C only (must not be used for
R22 or other refrigerant)
i)
Manifold gauge and charging hose
ii)
Gas leak detector
iii) Refrigerant cylinder/charging cylinder
iv) Vacuum pump c/w adapter
v)
Flare tools
vi) Refrigerant recovery machine
Filter-dryer must be installed along the liquid line for all
R407C air conditioners. This is to minimise the
contamination of moisture and dirt in the refrigerant
system. Filter-dryer must be of molecular sieve type. For
a heat-pump system, install a two-way flow filter dryer
along the liquid line.
• Close the manifold valve and stop the vacuum pump.
• On the outdoor unit, open the suction and liquid valve
(anti clockwise) with 4 mm key for hexagon sacked screw.
• The air conditioner unit is ready for start.
• If the reading is close to 0, the refrigerant circuit must be
evacuated (by vacuum pump) and charged again.
Refrigerant
Flare
Piping
Nut
Service
Outdoor Unit
Port
3 way Valve
Flexible Hose
4 mm
Allen
Key
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