Installation Manual
25
ENGLISH
Installation
If the actual pressure is higher than shown, the system is most likely over-charged, and charge
should be removed. If the actual pressure are lower than shown, the system is most likely
undercharged, and charge should be added.
NOTICE
PUMP DOWN
This is performed when the unit is relocated or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant into the outdoor unit without the loss of refrigerant.
Be sure to perform Pump Down procedure in the cooling mode.
Pump Down Procedure
1. Connect a low-pressure gauge manifold hose to the charge port on the gas side service valve.
2. Open the gas side service valve halfway and purge the air in the manifold hose using the refrigerant.
3. Close the liquid side service valve(all the way).
4. Turn on the unit's operating switch and start the cooling operation.
5. When the low-pressure gauge reading becomes 1 to 0.5kg/cm
2
G(14.2 to 7.1 P.S.I.G.), fully close
the gas side valve and then quickly turn off the unit. Now Pump Down procedure is completed,
and all refrigerant is collected into the outdoor unit.
Settlement of outdoor unit
1. Fix the outdoor unit with a bolt and
nut(ø10mm) tightly and horizontally on a
concrete or rigid mount.
2. When installing on the wall, roof or rooftop, anchor
the mounting base securely with a nail or wire
assuming the influence of wind and earthquake.
3. If the vibration of the unit is transmitted to the
pipe, secure the unit with an anti-vibration rubber.
Evaluation of the performance
Operate the unit for 15~20 minutes, then check
the system refrigerant charge:
1. Measure the pressure of the gas side service
valve.
2. Measure the air temperature from inlet and
outlet of air conditiioner.
3. Ensure the difference between the inlet and
outlet temperature is more than 8°C.
4. For reference; the gas side pressure at
optimum condition is shown on table
(cooling)
The air conditioner is now ready to use.
Bolt
Tubing connection
Discharge
temperature
Discharge air
Intake temperature
R-410A
35°C (95°F)
8.5~9.5kg/cm
2
G(120~135 P.S.I.G.)
Outside ambient
TEMP.
Refrigerant
The pressure of the gas side
Summary of Contents for AMNW12GRBL0
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