Basic Operational Principle; Flow Diagram Of System; Instruction Of Flow - Gree GMV-S120WL/A-S Service Manual

The unit has auto addressing distribution function and non-polar communication function; unit
has auto debugging and malfunction detection function; the unit adopts first-created CAN network
multi-unit communication technology, which is more reliable and has faster response speed;

4. Basic Operational Principle

4.1 Flow Diagram of System

4.2 Instruction of flow

Energize the unit, after the indoor and outdoor unit start to run and conduct cooling, the
low-temperature and low-pressure refrigerant gas comes from heat exchangers of different indoor
units is converged and compressed into compressor to be high-temperature and high-pressure
gas, and then it discharges into heat exchanger of outdoor unit and conducts heat exchange with
outdoor air to be refrigerant liquid, the refrigerant liquid will flow to each indoor unit via Y shape
branch pipes or branch manifolds, and is decompressed and cooled down by throttling device,
finally enters into heat exchanger of indoor unit and conducts heat exchange with adjustable air to
be low-temperature and low-pressure refrigerant gas. Circulate repeatedly in this way so as to
achieve cooling.
When conduct heating, four-way valve A and four-way valve B will operate to make refrigerant
conduct circulation according to converse process of cooling process; refrigerant discharges heat
in heat exchanger of indoor unit (electric heating components will also operate and discharge heat
under certain conditions), and absorbs heat from heat exchanger of outdoor unit to conduct heat
pump heating circulation, so as to achieve heating.
When conduct heating and water heating, four-way valve A and and four-way valve B operate,
refrigerant discharges heat in heat exchanger of indoor unit and hot water generator, and absorbs
heat from heat exchanger of outdoor unit to conduct heat pump heating and water heating
circulation, so as to achieve heating and heating water.
When heating water, four-way valve B operates, four-way valve B operates, refrigerant
discharges heat in hot water generator, and absorbs heat in heat exchanger of outdoor unit and
conduct heat pump heating and water heating circulation, so as to achieve heating water.
When conduct cooling and heating water, four-way valve B will operate according to actual
situation, refrigerant will discharge heat in hot water generator, and absorb heat in heat exchanger
GMV5 Home DC Inverter Multi VRF Units
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