Daikin REYQ96MTJU Installation Manual

Also see for REYQ192MTJU: Serveice manual Operation manual

Contents

Daikin REYQ96MTJU Installation Manual Manual pdf 19 page image

199. CAUTION FOR REFRIGERANT LEAKS(Points to note in connection with refrigerant leaks)IntroductionThe installer and system specialist shall secure safety againstleakage according to local regulations or standards. The followingstandards may be applicable if local regulations are not available.The VRV System, like other air conditioning systems, uses R410A asrefrigerant. R410A itself is an entirely safe non-toxic, non-combustiblerefrigerant. Nevertheless care must be taken to ensure that air condi-tioning facilities are installed in a room which is sufficiently large. Thisassures that the maximum concentration level of refrigerant gas is notexceeded, in the unlikely event of major leak in the system and this inaccordance to the local applicable regulations and standards.Maximum concentration levelThe maximum charge of refrigerant and the calculation of the maximumconcentration of refrigerant is directly related to the humanly occupiedspace in to which it could leak.The unit of measurement of the concentration is lb./ft 3( the weight in Ib.of the refrigerant gas in 1ft 3volume of the occupied space).Compliance to the local applicable regulations and standards for themaximum allowable concentration level is required.1. direction of the refrigerant flow2. room where refrigerant leak has occurred (outflow of all therefrigerant 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 concentrationCheck the maximum concentration level in accordance with steps 1 to 4below and take whatever action is necessary to comply.1. Calculate the amount of refrigerant (Ib.) charged to each systemseparately.NOTE• Where a single refrigerant facility is divided into 2 entirely indepen-dent refrigerant systems then use the amount of refrigerant withwhich each separate system is charged.2. Calculate the smallest room volume (ft 3)In case like the following, calculate the volume of (A), (B) as a singleroom or as the smallest room.A.Where there are no smaller room divisionsB.Where there is a room division but there is an openingbetween the rooms sufficiently large to permit a free flow of airback and forth.1. opening between rooms2. partition(Where there is an opening without a door or where there are open-ings above and below the door which are each equivalent in size to0.15% or more of the floor area.)3. Calculating the refrigerant density using the results of the calcula-tions in steps 1 and 2 above.If the result of the above calculation exceeds the maximum concen-tration level then make similar calculations for the second then thirdsmallest room and so until the result falls short of the maximum con-centration.4. Dealing with the situations where the result exceeds the maximumconcentration level.Where the installation of a facility results in a concentration in excessof the maximum concentration level then it will be necessary torevise the system.Please consult your Daikin supplier.amount of refriger-ant in a single unitsystem (amount ofrefrigerant withwhich the systemis charged beforeleaving the factory)+additional chargingamount (amount ofrefrigerant addedlocally in accordancewith the length ordiameter of the refrig-erant piping)=total amountof refriger-ant (Ib.) inthe system21total volume of refrigerant in therefrigerant system≤ maximum concen-tration level (Ib./ft 3)size (ft 3) of smallest room in whichthere is an indoor unit installed12

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