99
DC Inverter Multi
VRF Service Manual
2.2 Low-pressure Protection
Low-pressure protection
Use pressure gauge
to measure if the pressure
is really low?
Check if the refrigerant
in the system is too low?
Check if the operation
mode of indoor unit is
set properly?
Check if the gas valve
and liquid valve of outdoor unit are
fully open?
Check if the front panel
of outdoor unit is
covered tightly?
Check if the air inlet and
outlet of the indoor and outdoor
exchanger is smooth?
Check if the indoor and
outdoor fans run
normally?
Check if the indoor swing
louver is fully open?
Check if the capacity output of
outdoor unit is equal to the capacity
demand of indoor units?
Check if the indoor electronic
expansion valve can
work normally
Check if the indoor / outdoor
filters or radiating fins are dirty or
blocked?
The system pipe is blocked
Refer to the Repair
and Maintenance
Engage the valve body
with the coil
Refer to the dial-up of indoor
and outdoor unit
Measure the swing
motor and signal input
Measure the fan
motor and signal input
Remove the obstructions
Cover up the front panel
properly
Fully open the valve
Refer to the Instruction
Manual for Indoor Unit
Refer to low pressure sensor
error
Add refrigerant according to the nominal refrigerant volume
on nameplate and the calculated charge volume
Focus on checking the inlet and outlet of the connection between
indoor units and main pipe. Also focus on checking the electronic
expansion valve of indoor unit and outdoor unit. Replace the
electronic expansion valve, drying filter and other parts
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
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