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Dc Inverter VRF plus Water Heater Solution Service Manual PRODUCT

6.2 Explanation of Flowchart

When connected to power, the indoor and outdoor units start to work. When working under

cooling mode, the low-temperature and low-pressure refrigerant gas from the heat exchanger of

each indoor unit will collect and be suctioned by compressor, where it will be compressed into

high-temperature high-pressure gas. After that, the gas will enter into the outdoor heat exchanger,

where it will exchange heats with the outdoor air and become refrigerant liquid. Via Y-type

Branching pipe or Branching collection pipe, the liquid will flow into each indoor unit. The liquid will

be decreased of the pressure and temperature by throttling element. After that, the liquid will enter

into the indoor heat exchanger, where it will exchange heats with the air to be regulated in the

room and thus become low-temperature low pressure refrigerant gas. The process is cycled

repeatedly to achieve the purpose of cooling.

When working under heating mode, the 4-way valve AB will be activated, so that the

refrigerant will circulate in reverse to the cooling process. The refrigerant gives out heats in indoor

heat exchanger (Under specific conditions, the electric heating elements will start to work and give

out heats). In the outdoor heat exchanger, the refrigerant will absorb heat to perform heat pump

heating cycle, so as to achieve the purpose of heating.

When working under heating and hot water generation mode, the 4-way valve AB will be

activated, so that the refrigerant will give out heats in indoor heat exchanger and hydro indoor unit,

but absorbing heats in outdoor heat exchanger for heat pump heating and hot water generation

cycle, thus to achieve the purpose of both heating and hot water generation.

When working under hot water generation mode, the 4-way valve B will be activated, so that

the refrigerant will give out heats in hydro indoor unit, but absorbing heats in outdoor heat

exchanger for heat pump heating and hot water generation cycle, thus to achieve the purpose of

hot water generation.

When working under cooling and hot water generation mode, the 4-way valve B will be

activated as needed, in which case the refrigerant will give out heats in hydro indoor unit, but

absorbing heats in indoor heat exchanger for cooling heating and hot water generation cycle.

Under this mode, test may be done for complete recycling of the heats. But when the water

temperature is very high, only a part of heats can be recycled. The system may identify according

to reliable working range. In this way, the machine realizes the purpose of both cooling and hot

water generation.