LG General Wall Mounted-Inverter Type - Manual (Page 33)

Service Manual 33
Part 3 Test Run
1. Check that all tubing and wiring have been properly con-
nected.
2. Check that the gas and liquid side service valves are fully
open.
Settlement of outdoor unit
• Anchor the outdoor unit with a bolt and nut(ø10mm) tightly
and horizontally on a concrete or rigid mount.
• 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.
• In the case when the vibration of the unit is conveyed to the
hose, secure the unit with an anti-vibration bushing.
NOTE: 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.
The air conditioner is now ready for use.
5. Check operating current.
6. Change operation mode and check.
Evaluation of the performance
Operate unit for 15~20 minutes, then check the system
refrigerant charge:
1. Measure the pressure of the gas side service valve.
2. Measure the temperature of the intake and discharge air.
3. Ensure the difference between the intake temperature and
the discharge is more than 8°C(46°F) (Cooling) or
(Heating).
4. For reference; the gas side pressure of optimum condition
is as below.(Cooling)
Bolt
Tubing connection
Discharge
temperature
Discharge air
Intake temperature
R22 35°C (95°F) 4~5kg/cm 2 G(56.8~71.0 P.S.I.G.)
R410A 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
service valve.
This is performed when the unit is to be relocated or
the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant in the outdoor
unit without loss in refrigerant gas.
CAUTION:
Be sure to perform Pump Down procedure with the unit in
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
from the manifold hose using the refrigerant gas.
3. Close the liquid side service valve(all the way in).
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 stem and then quickly turn off the unit. At that time,
Pump Down has been completed and all refrigerant gas
will have been collected in the outdoor unit.
PUMP DOWN
3. Test Run Detail