Caution For Refrigerant Leak; Introduction; Checking Procedure Of Limiting Concentration - LG ARUN050LMC0 Installation Manual

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CAUTION FOR REFRIGERANT LEAK

The installer and system specialist shall secure safety against leakage
according to local regulations or standards.
The following standards may be applicable if local regulations are not
available.

Introduction

Though the R410A refrigerant is harmless and incombustible itself ,
the room to equip the air conditioner should be large to such an extent
that the refrigerant gas will not exceed the limiting concentration even
if the refrigerant gas leaks in the room.
Limiting concentration
Limiting concentration is the limit of Freon gas concentration
where immediate measures can be taken without hurting human
body when refrigerant leaks in the air. The limiting concentration
shall be described in the unit of kg/m
air volume) for facilitating calculation.
Limiting concentration: 0.44kg/m
Compressor Heat Exchanger
Module Module
Flow of
(No.1 system)
refrigerant
Indoor unit

Checking procedure of limiting concentration

Check limiting concentration along following steps and take
appropriate measure depending on the situation.
Calculate amount of all the replenished refrigerant (kg) per each
refrigerant system.
Amount of replenished Amount of additional
refrigerant per one outdoor + replenished refrigerant
unit system
Amount of replenished Amount of additionally
refrigerant at factory shipment replenished refrigerant
depending on piping
length or piping
diameter at customer
Calculate minimum room capacity
Calculate room capacity by regarding a portion as one room or the
smaller room.
- Without partition
Compressor Heat Exchanger
Module Module
Indoor unit
3 (Freon gas weight per unit
3 (R410A)
Room where refrigerant leaks
(Refrigerant of the whole No.1
system flows out.)
Total amount of replenished
=
refrigerant in refrigerant
facility (kg)
Note : In case one refrigerant facility is
www.lgcomfortcooling.co.uk
divided into 2 or more refrigerant
systems and each system is
independent, amount of replenished
refrigerant of each system shall be
adopted.
- With partition and with opening
which serve as passage of air to
adjoining room
Compressor Heat Exchanger
Module Module
In the case of opening
Indoor unit
without door , or 0.15
Opening
% or more openings
(to floor space) both
Partition
above and below door)
- With partition and without opening which serve as passage of air to
adjoining room
Compressor
Module
Smallest
room
Calculate refrigerant concentration
Total amount of replenishedrefrigerant
in refrigerant facility (kg)
Capacity of smallest room
whereindoor unit is installed (m
- In case the result of calculation exceeds the limiting concentration, perform
the same calculations by shifting to the second smallest, and the third
smallest rooms until at last the result is below the limiting concentration.
In case the concentration exceeds the limit
When the concentration exceeds the limit, change original plan or take
one of the countermeasures shown below:
• Countermeasure 1
Provide opening for ventilation.
Provide 0.15% or more opening to floor space both above and below
door, or provide opening without door.
• Countermeasure 2
Provide gas leak alarm linked with mechanical ventilator.
Reducing the outdoor refrigerant qty.
Gas leak alarm
Countermeasure 2
Mechanical ventilator
Indoor unit
Pay a special attention to the place, such as a basement, etc.
where refrigerant can stay, since refrigerant is heavier than air.
Heat Exchanger
Module
Indoor unit
= Refrigerant concentration(kg/m
3 )
(R410A)
Countermeasure 1 Opening effective to ventilation
3 )