Gree HOME GMV Инструкция по эксплуатации онлайн [56/367] 48267

Gree HOME GMV Инструкция по эксплуатации онлайн [56/367] 48267
Dc Inverter VRF plus Water Heater Solution Service Manual CONTROL
52
2 Explanation of Schematic Diagram
Outdoor Unit System
Function: It connect with indoor unit or hydro-box to receive their ON/OFF command, mode, setting temp and
ambient temp by 3-pin communication wire. It can determine its running mode and the proper running
frequency which will be sent to drive-control system; It can adjust fan speed according to system pressure and
monitor the temp of each temp sensor,running status and protection of the units in real time in order to make
sure normal running of the whole system.If there is any malfunction that occurs, nixie display indicator on
master control board will display the protection code which indicates specific type of malfunction. The code of
malfunction of the drive is E5.
High pressure switch is used for judging the high pressure of the system. When the pressure is too high, the
high pressure switch will break and such signal will be received by mainboard and later be sent to control
device. Then,the error code will be displayed on control device and the unit will stop.
Cap jumper is used for distinguish the rated capacity of the unit and different cap jumpers mean different
capacities of outdoor units.When control device detects that the value of cap jumper doesn’t match the
capacity of the unit, corresponding error will be displayed and the unit can’t be started up.
Ambient temp sensor is used for detecting ambient temp of outdoor unit,according to which, control device
can calculate the capacity.
Temp sensor of pipe inlet is used for detecting actual temp of pipe inlet of outdoor unit,according to which,
control device can adjust steps of the corresponding electric expansion valve.
Temp sensor in middle of the pipe is used for detecting actual temp in the middle of the pipe of outdoor
unit,according to which, control device will judge if defrosting need to be executed.
Temp sensor of pipe outlet is used for detecting actual temp of pipe outlet of outdoor unit,according to which,
control device can adjust steps of the corresponding electric expansion valve.
Discharge temp sensor is used for detecting the temp of discharged air,according which, control device can
adjust the frequency of corresponding compressor.
High pressure sensing device is used for detecting pressure of discharged air, according to which, the control
device can judge the speed of fan, frequency of compressor and opening angle of electric expansion valve;
When the pressure is too high, the units will enter high pressure protection,the control device will display the
corresponding error and the units can’t be started up.
Low pressure sensing device is used for detecting pressure of outdoor unit, according to which, the control
device can judge the speed of corresponding fan. When the pressure is too low, the units will enter low
pressure protection,the control device will display the corresponding error and the units can’t be started up.
Based on the mode of the unit and the pressure,outgoing control of the fan judge and output corresponding
speed.
ON/OFF of 4-way valve is determined by the mode of the units.
ON/OFF of electromagnetic valve is determined by the mode of the units.
Based on the value of high pressure,temperautures of inlet and outlet of the pipe or discharge temp under
different modes, electric expansion valve adjusts its opening angle.
Based on the capacity calculated by outdoor unit, compressor outputs different frequencies to drive control
which will output actual frequency of compressor.
Filter plate: It filters power interference and protects the units under bad power environment; it restrains units
from disturbing power supply and prevent the units from affecting the works of other electric appliances.Due to
inverter units are sensitive to interference, the filter plates usually are equipped for current inverter units. The
power supply of this units is single-phase so the filter plate is also the single-phase whose input terminals are

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