E3 system low pressure protection
Does the low pressure
reach the protection value? Test
with pressure gauge.
Is system refrigerant
quantity too little?
Check if the liquid pipe of
ODU and cut-off valve of gas
pipe is completely opened?
Check if the panel of ODU
module covered completely?
Are there any barriers in the air
inlet/outlet of IDU and ODU?
Is the fan of IDU and ODU
operating normally?
Check if the swing plate of
IDU is completely opened?
Does the DIP capacity
of rated capacity of IDU exceed
the allowed range?
Check if the operation
of electronic expansion valve
of IDU and ODU normal?
Check if the filter
screen of IDU return air is dirty
or blocked?
System pipeline is
blocked.
Clean the filter screen.
Replace the electronic
expansion valve or main board.
Set the rated capacity of IDU in
the allowable range.
Check the swing motor and output
signal of the main board, replace
the swing motor or the main
board.
Test the input signal of fan,
replace motor or main board.
Remove the barriers.
Cover the panel again.
Open the cut-off valve completely
Low pressure sensor error,
replace the pressure sensor.
No
No
No
No
Yes
No
Yes
No
No
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Add refrigerant according to
design, pipeline and
refrigerant requirement.
Check the system pipeline,
especially the pipeline section in the
first branch from ODU to IDU.
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