Table of Contents
Advertisement
15.2 STANDARD CONTROLS
Compressors oil level check
Inlet temperature check (overheating)
Water circuits filling check
Compressors motors electrical input check
Power supply and auxiliary power voltage check
Refrigerant charge check through sight glass
Compressors carter heaters operation check
Tightening all electrical connections
Compressors and liquid circuit solenoid valve check
Compressors contactors state check
Evaporator heater operation check
Pressure vessels conditions check
Check glycol concentration in the chilled water circuit if
glycol presence is required
Check and clean the strainer
Check operation of all safety devices
Carry out oil analysis and change the oil if necessary
If the "leak detector" option is selected, the gas detector
must be subjected to a calibration procedure as per
manufacturer specifications
Temperature and pressure probes
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
Operations description
–
The unit comes factory-equipped with all the sensors listed below. Periodically
Recommended basis
monthly
monthly
monthly
monthly
monthly
monthly
monthly
monthly
semiannual
quarterly
quarterly
yearly
monthly
monthly
annual
annual
annual
Page 47
Advertisement
Table of Contents
