After water pump (field supplied) is turned on
for 2min, if water flow switch is open, water
pump stops and water flow error code
appears. The compressor can be started after
the water flow is normal.
5.3 Compressor Output Control
The compressor rotation speed is controlled according to the load requirement. Before compressor startup, the outdoor unit
determines the compressor target speed according to outdoor ambient temperature, discharge temperature and then runs the
appropriate compressor startup program. Once the startup program is complete, the compressor runs at the target rotation
speed.
The compressor speed is controlled according to two parts in normal operation:
In cooling mode: In a single system, the compressor speed is controlled according to the water outlet temperature and water
outlet setting temperature. In a combination system, the compressor of master unit is controlled according total water outlet
temperature and water outlet setting temperature, the compressor of the slave unit is controlled according to water inlet and
water outlet temperature. Both in a single system and combination system, the compressor speed is limited by the inverter
module temperature (calculated value), ambient temperature, discharge temperature, discharge pressure and air side heat
exchanger refrigerant total outlet temperature.
5.4 Compressor Step Control
The running speed of six-pole compressors in rotations per second (rps) is one third of the frequency (in Hz) of the electrical
input to the compressor motor. The frequency of the electrical input to the compressor motors can be altered at a rate of 1Hz in
one second.
5.5 Four-way Valve Control
The four-way valve is used to change the direction of refrigerant flow through the water side heat exchanger in order to switch
between cooling and heating operations. During heating operation, the four-way valve is on; during cooling and defrosting
operation, the four-way valve is off.
5.6 Electronic Expansion Valve Control
Power-on self-test:
When the power is first turned on, the EXV is closed for 700 steps, proofreading the 0-step position, and re-opening at a
maximum of 480.
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