Haier AU42NAIERA [21/26] Installation procedure
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Haier AU42NAIERA [21/26] Installation procedure

Haier AU42NAIERA [21/26] Installation procedure
In case of gas leakage, tighten
parts of pipe connection. If
leakage stops, then proceed 6
steps.
Refrigerant piping
19
When the total length (L) of the two indoor units' connecting pipe is less than 5m, it is
unnecessary to charge additional refrigerant.
If the connecting pipe (L) exceeds 5m, it shall charge Mg additional refrigerant per meter.
That is: Refrigerant charging amount = (L-5) x M (g)
For AU122AEERA, AU182AFERA, M=30
For AU242AGERA, AU282AHERA,AU362AHERA, AU36NAHERA,AU422AIERA,
AU42NAIERA.AU522AIERA,AU52NAIERA,M=50
Only in COOLING operation can charge the additional refrigerant.
When charging, the refrigerant shall be charged from the charging nozzle of low pressure vavle.
Be carefull when charging refrigerant, do not let the air mix into the system,and must charge the
additional refrigerant in liquid condition.
6. Piping method: to use wacuum pump( e.g. AU182AFERA)
7. Charging amount of refrigerant
Installation Procedure
CAUTION:If the refrigerant of the air conditioner leaks, it is necessary to make all the refrigerant out.
Vacuumize first, then charge the liquid refrigerant into air conditioner according to the amount marked
on the name plate.
2 way valve
3 way valve
90
0
Service port
90
0
for 6 sec.
6 .Detach the charge hose from the service port, open 2-
way valve and 3-way. Turn the valve rod anticlockwise
until hitting lightly.
Liquid stop valve
2 way valve
3 way valve
Gas stop valve
Gauge maifold(R410A)
Vacuum pump(R410A)
Open
Close
2 way valve
3 way valve
6
6
2 way valve
3 way valve
Valve rod cap
Valve rod cap
Service port cap
1 .Detach the service portis cap of 3-way valve, the valve
rod's cap for 2-way valve and 3-way valves, connect the
service port into the projection of charge hose (low) for
gaugemanifold. Then connect the projection of charge
hose (center) for gaugemanifold into vacuum pump.
2 .Open the handle at low in gaugemanifold, operate
vacuum pump. If the scale-moves of gause (low) reach
vacuum condition in a moment, check 1 again.
3 .Vacuumize for over 15min. And check the level gauge
which should read -0.1MPa (-76 cm Hg) at low pressure
side. After the completion of vacuumizing, close the
handle 'Lo' in the vacuum pump. Check the condition of
the scale and hold it for 1-2min. If the scale-moves back
in spite of tightening, make flaring work again, then
return to the beginning of 3 .
4 .Open the valve rod for the 2-way valve to and an angle
of anticlockwise 90 degree. After 6 seconds, close the 2-
way valve and make the inspection of gas leakge.
5 .No gas leakage?
If it does not stop gas leakage, discharge
whole refrigerants from the service port.
After flaring work again and vacuumize,
fill up prescribed refrigerant from the gas
cylinder.
7 .To prevent the gas leakage, turn the service ports cap,
the valve rodis cap for 2-way valve and 3-way's a little
more than the point where the torque increases suddenly.

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