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•
All wires must be firmly connected.
•
All wires must not touch the refrigerant piping, compressor
or any moving parts of the fan motor.
•
The connecting wires between the indoor unit and the
outdoor unit must be clamped on the wire clamps as shown
in the figure.
•
The power supply cord must be equivalent to H05RN-F
(245IEC57) which is the minimum requirement.
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.
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
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 changing 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.
VACUUMING AND CHARGING
(using
the
refrigerant
1-7
Wire Clamp
Interconnection
Cable
•
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 additional charge of compressor oil is permitted.
•
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.
Allen key
Service Port
Liquid side
Indoor Unit
Gas side
Open
Vacuum
Hi
pump
Low
Close
Power Supply
Cable
Refrigerant
Piping
Flare nut
Outdoor Unit
3 ways valve
Outdoor Unit
Discharge
Valve
Close
Suction
valve
Close
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