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This filter should be checked periodically. In the event that the filter is blocked, it causes a resistance to the
gas flow, due to which the gas pre-evaporates, thus losing its capacity. This situation may be observed as
bubbles seen through the sight glass or small temperature differences between the entrance and the exit of
the filter.
10.1.12. Power Released by the Compressor
The power or the current released by the compressor should be measured from the relevant contractor on the
panel during the operation and checked to insure that it does not exceed the limit values offered.
10.1.13. Operation Status of the High-Pressure Switch
Attach a manometer with 50 bars as the last pressure value on its scale to the end of the ¼”-diameter service
valve on the discharge side of the compressor. Stop the fan condenser when the device is operating, and
follow the rise of the pressure on the barometer. A high-pressure Switch of 40 bars should stop the
compressor. If it reaches 40 bars but the compressor does not stop, turn off the device without delay and
check the high-pressure Switch. If the adjustment point is correct, then the Switch may be malfunctioning.
Never operate the device again unless you replace this Switch.
10.1.14. Operation Status of the Low-Pressure Switch
Attach a manometer with 20 bars as the last pressure value on its scale to the end of the ¼”-diameter service
valve on the discharge side of the compressor. Turn off the valve on the suction side of the compressor when
the device is operating. The low pressure Switch of 2.5 bars should stop the compressor. If it does so, open
the valve again, and the compressor should start to work when it reaches 2.5 bars. If it reaches 2.5 bars with
the valve closed but the compressor does not stop, turn off the device without delay and check the low
pressure Switch. If the adjustment point is correct, then the Switch may be malfunctioning. Never operate
the device again unless you replace this Switch.
10.1.15. Operation Temperature of the Compressor
The temperature on the upper parts of the compressor should be around 60-70ºC under normal operating
conditions. This values may be around 20-30ºC on the lower parts. If temperatures fall below these values
and condensation is seen on the upper parts of the compressor, this means that the temperature turning back
to the compressor is too low. This is usually encountered when it turns back to the compressor as a liquid.
This occurs in the event that the extra heating is lower than it should have been. For this purpose, the
expansion valve adjustments should be checked.
If the temperature on the force side of the compressor is 50ºC or higher, this means that the expansion valve
allows insufficient gas to pass into the evaporator, which is a problem to be corrected by the expansion valve
adjustments.
Expansion valve adjustments should be made by cooling professionals. Damages due to these
adjustments are regarded as operative errors and are not covered by the warranty.
10.2. Procedure of Start Up and Operation
The operation to take the device into the circuit for the first time should always be carried out by Untes technical
personnel.
The operations carried out by unauthorized people will cause the device to remain out of the
scope of the warranty.
This procedure with the exception of circuiting for the first time is introduced in 12.1
Mounting and Using the Unit.
