Daikin ERAD 120E-SL, Инструкция по установке, эксплуатации и обслуживанию

Страница: 69 / 76

D
–EIMAC00708-16EN - 69/76
Standard Checks
Temperature and Pressure Transducers
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. W ell-calibrated sensors ensure better efficiency for the machine 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 b elow:
Evaporator fluid leaving temperature sensor
–
This sensor is located on the evaporator outgoing water connection
and is used by the microprocessor to control the machine’s load according to the system’s thermal load. It also performs
the evaporator’s antifreeze protection.
Evaporator fluid entering 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
– Optional. This sensor allows to monitor the external air temperature on the
microprocessor display. It is also used to carry out the “OAT setpoint override”.
Compressor delivery pressure transducer
– This is installed on every compressor and allows to monitor the delivery
pressure and to control the ventilators. Should a increase in condensation pressure arise, the microprocessor will control
the compressor load in order to allow it to function even if choked. It contributes to complementing the oil control logic.
Oil pressure transducer - This is installed on every compressor and allows to monitor the oil pressure. Using this
sensor, the microprocessor informs the operator on the conditions of the oil filter and on how the lubrication system is
functioning. By working together with the high- and low-pressure transducers, it protects the compressor from problems
deriving from poor lubrication.
Low-pressure transducer
– This is installed on every compressor and allow to monitor the compressor intake pressure
along with low pressure alarms. It contributes to complementing the oil control logic.
Compressor discharge temperature sensor
– This is installed on each compressor and allows to monitor compressor
discharge temperature and oil temperature. The microprocessor controls liquid injection by means of this sensor and
shuts down the compressor in case of alarm in the event that the discharge temperature reaches 110°C. It also protects
the compressor from possible startups with liquid.