Lgmv; Lack Of Cooling - LG MULTI V 5 Manual Book

1. LGMV

064
_TROUBLE SHOOTING GUIDE BOOK

2. Lack of Cooling

2.1 Not reach target low pressure
Checking Item Symptom Judgment
Inlet temp. of
≥ 14 ℃ Refrigerant shortage
indoor unit
Cooling overload
Refrigerant shortage
Defective temp.
≥ 5 ℃
sensor of indoor
unit
Defective EEV of
The degree of
indoor unit
superheat of
Discharge
indoor unit
temp. is
normal under
full operation
Bypass on indoor
but discharge
flow
temp. is
abnormal
under partial
operation
※ the inlet temperature of the indoor unit : When the present low pressure reaches the target low pres-
sure, the inlet temperature of the indoor unit should be not more than evaporation temperature + 10 ℃
※ The degree of superheat of indoor unit (It may be different depending on the outdoor unit control)
> 2 ℃ : EEV Open
< 2 ℃ : EEV Close
Countermeasure
Check the indoor EEV opening pulse. When the
opening pulse is small or closed, please lower the
degree of superheat of the corresponding indoor unit
Check the indoor unit EEV
Check the liquid pipe blocking or the foreign sub-
stances in the strainer.
Check indoor unit with bypass flow
(Confirm total flow while changing full / partial /
single operation)
Recheck the load design, Check the ambient air
flow, (if duct type) inlet / outlet chamber installation
Check the amount of refrigerant
Check the temperature sensor of indoor unit
Check the indoor unit EEV
If the liquid pipe and the gas pipe are connected to
a place without an indoor unit, separate the con-
nected pipe.
065
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