Daikin RXYQ26PY1 Installation Manual download pdf (Page 21)

English 16

12. CAUTION FOR REFRIGERANT LEAKS

(Points to note in connection with refrigerant leaks)

Introduction

The installer and system specialist shall secure safety against

leakage according to local regulations or standards. The follow-

ing standards may be applicable if local regulations are not

available.

The VRV System, like other air conditioning systems, uses R410A as

refrigerant. R410A itself is an entirely safe non-toxic, non-combusti-

ble refrigerant. Nevertheless care must be taken to ensure that air

conditioning facilities are installed in a room which is sufficiently large.

This assures that the maximum concentration level of refrigerant gas

is not exceeded, in the unlikely event of major leak in the system and

this in accordance to the local applicable regulations and standards.

Maximum concentration level

The maximum charge of refrigerant and the calculation of the maxi-

mum concentration of refrigerant is directly related to the humanly

occupied space in to which it could leak.

The unit of measurement of the concentration is kg/m

( the weight in

kg of the refrigerant gas in 1m

volume of the occupied space).

Compliance to the local applicable regulations and standards for the

maximum allowable concentration level is required.

In Australia the maximum allowed concentration level of refrigerant to

a humanly space is limited to 0.35kg/m

for R407C and 0.44kg/m

for

R410A.

1. direction of the refrigerant flow

2. room where refrigerant leak has occurred (outflow of all

the refrigerant from the system)

Pay a special attention to the place, such as a basement, etc.

where refrigerant can stay, since refrigerant is heavier than air.

Procedure for checking maximum concentration

Check the maximum concentration level in accordance with steps 1

to 4 below and take whatever action is necessary to comply.

Calculate the amount of refrigerant (kg) charged to each system

separately.

Note

• Where a single refrigerant facility is divided into 2 entirely inde-

pendent refrigerant systems then use the amount of refrigerant

with which each separate system is charged.

Calculate the smallest room volume (m

)

Incase like the following, calculate the volume of (A), (B) as a sin-

gle room or as the smallest room.

Where there are no smaller room divisions

Where there is a room division but there is an opening

between the rooms sufficiently large to permit a free flow of

air back and forth.

1. opening between rooms

2. partition

(Where there is an opening without a door or where there are

openings above and below the door which are each equivalent in

size to 0.15% or more of the floor area.)

Calculating the refrigerant density using the results of the calcu-

lations in steps 1 and 2 above.

If the result of the above calculation exceeds the maximum con-

centration level then make similar calculations for the second then

third smallest room and so until the result falls short of the maxi-

mum concentration.

Dealing with the situations where the result exceeds the maxi-

mum concentration level.

Where the installation of a facility results in a concentration in

excess of the maximum concentration level then it will be neces-

sary to revise the system. Please consult your Daikin supplier.

amount of refriger-

ant in a single unit

system (amount of

refrigerant with

which the system

is charged before

leaving the factory)

additional charging

amount (amount of

refrigerant added

locally in accordance

with the length or

diameter of the refrig-

erant piping)

total amount

of refriger-

ant (kg) in

the system

total volume of refrigerant in the

refrigerant system

≤

maximum concen-

tration level (kg/m

)

size (m

) of smallest room in which

there is an indoor unit installed

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