Hydro Box Control System - Gree GMV-S120WL/A-S Service Manual

Hydro Box Control System

Main board of hydro box: It communicates with outdoor unit, long-distance monitor and indoor
air conditioners through the CAN bus. Besides, it supplies power to and communicates with wired
controllers through HBS bus. On the main board, the 4-digit DIP switch is used to select hydro box
model while the 5-digit DIP switch is used to select the capacity of hydro box. The sensing quantity
of main board includes lower water temperature, upper water temperature, back water
temperature, refrigerant inlet tube temperature, and refrigerant outlet tube temperature. Main
board sends its status information to outdoor unit and receives control information from outdoor
unit. It is also linked with the on and off, mode, set temperature and other data of indoor unit. It is
used for floor heating as well.
Extension board of hydro box: It is used to sense the entering and leaving water temperature
of hydro box, solar power water temperature, water flow switch, etc. and at the same time control
floor heating performer, solar power water pump, hydro box electric heater, valve C and valve D.
Input and Output Control Quantity:
Water tank lower water temperature: The heating of water tank and water volume display are
controlled according to the water temperature at the upper and lower part of the water tank,
Water tank upper water temperature: Water temperature at the upper part of water tank is
sensed.
Water tank back water temperature: Cycle pump is controlled according to water tank back
water temperature and water tank lower water temperature.
Refrigerant inlet tube temperature: Refrigerant temperature at the tube inlet will be sensed.
Refrigerant outlet tube temperature: Refrigerant temperature at the tube outlet will be sensed.
Hydro box entering water temperature: Entering water temperature of circulating water will be
sensed. Floor heating is controlled according to the entering water temperature and leaving water
temperature of hydro box.
Hydro box leaving water temperature: Leaving water temperature of circulating water will be
sensed.
Solar power water temperature: Solar power water temperature will be sensed.
Water flow switch: It is used to protect the water pump when water flow is too small.
Valve A and valve B: They control the direction of refrigerant flow.
Electronic expansion valve: They control the volume of refrigerant flow.
Cycle pump: It controls the water temperature at user side.
Electric heater: It is used to heat water quickly or provide hot water quickly.
Floor heating performer: It is used to control floor heating room by room.
Solar power water pump: It controls the exchange between solar power hot water and water
tank hot water.
Hydro box electric heater: It is used to control quick floor heating.
Valve C: It is used to control heating of internal-coiled water tank.
Valve D: It is used to control floor heating.
GMV5 Home DC Inverter Multi VRF Units
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