Haier MRV5-H - Page 89

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Data
Measuring
1. Connecting methods of test device:
Insert one end of data line into the terminal of main
PCB CN31 with a two-core terminal, one end connects
with 485 device or Gangda device, the other end of the
device connects computer.
Position of inserting test device (CN47)
It is normal if there is high pressure frequency
limitation or high discharging temperature
frequency limitation when outdoor ambient
temperature is high and all the indoor units are
operating.
2. The data that can acquire through device Outdoor unit:
The frequency of outdoor unit compressor /Outdoor fan
speed/Opening of outdoor electronic expansion valve/ High
pressure of outdoor unit/Corresponding saturation
temperature of outdoor unit’s high pressure/Low pressure
of outdoor unit/Corresponding saturation temperature
of outdoor unit’s low pressure/Discharging temperature/
Suction temperature/Oil temperature/ Temperature of
condenser outlet pipe/Ambient temperature/Temperature
of defrosting sensor/Starting of all kinds of solenoid valve
Indoor unit: Temperatures of gas pipe and liquid pipe,
opening angle of electronic expansion valve /Display of
failure
3.Test device can display failures of the unit during
operation, moreover it can realize a function of storing data
in real time, and the test data can be stored in computer.
4.Prepare a report according to the test data and submit it
to user.
Conrmation
of the Data
The conrmation of running data/Timing and recording of
the measurement.
After the measurement is begun, check the system
pressure through detection software. Generally, the cooling
low pressure is about 7.5kg and the heating high pressure
is about 28kg under rated cooling and heating modes.
Then observe if operation under each parameter is normal.
There is a picture about cooling operating parameters’ data
in the right column, after operating about half hour, the unit
remains stable.
Check if there is a blockage in capillary during operation, if
any, replace it.
Check if there is contact between refrigerant piping and
capillary tube, if any, deal with it.
Check if wires of sensor (such as wiring, pressure sensor,
etc.) are too tight, or contact with vibrating pipe, if so, deal
with it.
Check if the value of sensor is correct.