Caution For Refrigerant Leaks - Daikin VRV II Series Design, Installation & Testing Instructions

Caution for Refrigerant Leaks

9. Caution for
9.1

Caution for Refrigerant Leaks

9.1.1 Introduction
Points to note in connection with refrigerant leaks
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.
9.1.2 Maximum Concentration Level
The maximum charge of refrigerant and the calculation of the maximum 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
volume of the occupied space). Compliance to the local applicable regulations and standards of
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
0.44kg/m
Pay special attention to the place, such as a basement, etc., where refrigerant can stay, since
refrigerant is heavier than air.
9.1.3 Procedure for Checking Dangerous Concentration
Check the Dangerous concentration in accordance with steps (1)-(4) below and take whatever
action is necessary.
Step1: Calculate the amount of refrigerant (kg) charged to each system separately.
Notes: Where a single refrigerant facility is divided onto 2 entirely independent refrigerant systems then
use the amounts of refrigerant with which each separate system of charged.
194
Refrigerant Leaks
3
for R410A.
O tdoor nit
Direction of refrigerant flow
Indoor nit
(Amount of refrigerant
in a single indoor
unit system)
3
(the weight in kg of the refrigerant gas in 1m
(Additional charging Total amount of
+ amount) = refrigerant (kg) in
the system
Amount of refrigerant with which
the system is charged before
leaving the factory
Amount of refrigerant added
locally in accordance with the
length or diameter of the
refrigerant piping
Si39-303
3
3
for R407C and
Room where
refrigerant leak has
occurred (Outflow
of all the refrigerant
in system).
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