Friedrich M18YJ Manual De Instalación página 24

24
Evaluation of the performance
Operate the unit for 15~20 minutes, then
check the system refrigerant charge:
- Measure the pressure of the gas side service
valve.
- Measure the air temperature from inlet and
outlet of air conditiioner.
- Ensure the difference between the inlet and
outlet temperature is more than 46°F.
- For reference; the gas side pressure at opti-
mum condition is shown on table (cooling)
The air conditioner is now ready to use.
Inlet temperature
Discharge air
Outside
Refrigerant ambient
TEMP.
R-22 95°F(35°C)
R-410A 95°F(35°C)
*The feature can be changed according a type of
model.
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 under-
charged, and charge should be added.
Discharge
temperature
The pressure of
the gas
side service valve.
4~5kg/cm 2 G
(56.8~71.0
P.S.I.G.)
8.5~9.5kg/cm 2 G
(120~135 P.S.I.G.)
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 refrig-
erant.
CAUTION
!
Be sure to perform Pump Down procedure
in the cooling mode.
Pump Down Procedure
- Connect a low-pressure gauge manifold
hose to the charge port on the gas side serv-
ice valve.
- Open the gas side service valve halfway and
purge the air in the manifold hose using the
refrigerant.
- Close the liquid side service valve(all the
way).
- Turn on the unit's operating switch and start
the cooling operation.
- When the low-pressure gauge reading
becomes 1 to 0.5kg/cm
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 refrig-
erant is collected into the outdoor unit.
2 G(14.2 to 7.1