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15.2
STANDARD CONTROLS
Operations description
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
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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