McQuay L Serie Manual De Instalación página 12

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 refriger-
ant (R22), thus proper installation / servicing is essential.
• Never use refrigerant other than R410A in an air
conditioner which is designed to operate with R410A.
• POE or PVE 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 or
PVE 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.
Vacuuming is necessary to eliminate all moisture and air from the system.
Vacuuming 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 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.
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.
• 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.
SPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNIT
VACUUMING AND CHARGING
• 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.
Allen key
Service Port
LOW PRESSURE GAUGE
HANDLE LO
CHARGE HOSE
LIQUID VALVE
GAS VALVE
(3-WAY)
LOW PRESSURE GAUGE
HANDLE LO
CHARGE HOSE
LIQUID VALVE
GAS VALVE
(3-WAY)
1-10
Refrigerant Piping
Flare nut
Outdoor Unit 3 ways valve
HIGH PRESSURE GAUGE
-760mmHg
GAUGE MANIFOLD
HANDLE HI (ALWAYS CLOSED)
CHARGE HOSE
VACUUM PUMP
ADAPTER FOR
COUNTER FLOW
PREVENTION
CHECK VALVE
CONFIGURATION OF AIR
PURGE BY CHARGING
HIGH PRESSURE GAUGE
-760mmHg GAUGE MANIFOLD
HANDLE HI (ALWAYS CLOSED)
CHARGE HOSE
CONFIGURATION OF AIR
PURGE BY CHARGING
CHECK VALVE