SiENBE28-901
Test Operation
Air Cooled Refrigeration Condensing Unit
71
[Precautions for refrigerant cylinder]
At the time of refrigerant filling, check whether the siphon tube is provided. Then locate the
cylinder so that the refrigerant will be filled in the state of liquid (see table below).
R410A is a mixed refrigerant, the composition of which may change and the normal operation of
the system may not be possible if the refrigerant is filled in the state of gas.
[Check through sight glass]
Caution
Fully open the shutoff valves on the liquid and gas sides after the additional
refrigerant charge is finished.
The compressor will malfunction if the system is operated with the shutoff valves closed.
Apply a screw lock agent to the screws of the valve cover mounting parts and service
ports.
(Otherwise, dew condensation water will intrude and freeze inside and cause cap
deformation or damage, which may result in refrigerant gas leakage or compressor
malfunctions.)
5.6
Test Run
For test run operators
Do not operate the outdoor unit alone on a trial basis.
Test run procedure
Use the following procedure to perform a test run after installation work is complete for the
entire system:
1.
Fully open the shutoff valves on the gas and liquid sides of the outdoor unit.
2.
Set the RUN switch of the outdoor switch to ON.
Note: Before turning power on, check that the piping cover and control box lid of the outdoor
unit are closed.
3.
Check the sealing condition of the outdoor unit through the sight glass. Make sure that the
amount of refrigerant is sufficient.
4.
Make sure that cold air blows from the indoor unit.
Check that the internal temperature is dropping.
(Check that the temperature will drop and reach the set temperature in the internal unit. It will
take approximately 40 minutes for the interior temperature of the internal unit to reach –20°C.)
Check that the indoor unit (for refrigeration or freezing) goes into defrosting operation.
5.
Turn power off with the RUN switch of the outdoor unit set to OFF.
(Stopping unit operation by disconnecting the power supply directly is dangerous. When the
unit is stopped in this manner, its power outage compensation function may cause it to
resume operation as soon as the power supply is reactivated. Additionally, stopping the unit
in this manner may cause the compressor to fail).
Cylinder provided with siphon tube.
Other cylinders
Stand the cylinder upright and fill the refrigerant.
(There is a siphon tube inside, which makes it
possible to replenish the refrigerant in the state of
liquid without setting the cylinder upside down.)
Stand the cylinder upside down and fill the
refrigerant.
(Pay attention so that the cylinder will not topple
down.)
Full of liquid
A little foam
flows.
Sealing state
Foam always
comes out.
Refrigerant insufficiency
Sight glass
