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15.2
STANDARD CONTROLS
Operations description Recommended basis
Compressors oil level check monthly
Inlet temperature check (overheating) monthly
Water circuits filling check monthly
Compressors motors electrical input check monthly
Power supply and auxiliary power voltage check monthly
Refrigerant charge check through sight glass monthly
Compressors carter heaters operation check
monthly
Tightening all electrical connections monthly
Compressors and liquid circuit solenoid valve check semiannual
Compressors contactors state check quarterly
Evaporator heater operation check quarterly
Pressure vessels conditions check yearly
Check glycol concentration in the chilled water circuit if
glycol presence is required
monthly
Check and clean the strainer monthly
Check operation of all safety devices annual
Carry out oil analysis and change the oil if necessary annual
If the "leak detector" option is selected, the gas detector
must be subjected to a calibration procedure as per
manufacturer specifications
annual
Temperature and pressure probes –
The unit comes factory-equipped with all the sensors listed below. Periodically
check that their measurements are correct by means of sample instruments (manometers, thermometers); correct readings
if necessary using the microprocessor keyboard. Well- calibrated sensors ensure better efficiency for the unit and a longer
lifetime.
Note: refer to the microprocessor use and maintenance manual for a complete description of applications, setting and
adjustments.
All sensors are preassembled and connected to the microprocessor. The descriptions of each sensor are listed below:
Outgoing water temperature sensor –
This sensor is located on the evaporator outgoing water connection and is used
by the microprocessor
for antifreeze protection and
to control the unit load according to the system thermal load
.
IMPORTANT
In case a temperature control based on ingoing water temperature is needed please contact Trane before carrying out
any trying to set it autonomously
.
Ingoing water temperature sensor –
This sensor is located on the evaporator ingoing water connection and is used for
monitoring the return water temperature.
External air temperature sensor –
This sensor allows to monitor the external air temperature on the microprocessor
display and to manage the activation/deactivation of the compressors crankcase heaters
High pressure transducer –
This allows to monitor the delivery pressure and to control the ventilators. Should an increase
in condensation pressure occur, the microprocessor will control the circuit load in order to allow it to function even if choked.
It contributes to complementing the oil control logic.
Low-pressure transducer –
This allows to monitor the compressor suction pressure along with low pressure alarms. It
contributes to complement the oil control logic and to manage the electronic expansion valve.
Compressor discharge temperature sensor –
This allows to monitor compressor discharge temperature and oil
temperature. The microprocessor shuts down the compressor in case of alarm in the event that the discharge temperature
reaches 120°C
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