Refrigerant Leakage Caution; Introduction - Fujitsu AIRSTAGE J-IIIL Design & Technical Manual

1. Refrigerant leakage caution

The system designer and installer are to ensure that the system adhere to all local regulations re-
garding refrigerant leakage.

1-1. Introduction

Designing VRF systems requires special attention to codes and standards relating to Refrigeration
Concentration Limit (RCL). The RCL is intended to "reduce the risks of acute toxicity, asphyxiation
and flammability hazards in normally occupied, enclosed spaces". Because R410A in neither toxic
nor flammable, the primary safety concern is asphyxiation due to oxygen deprivation.
Concentration limit
The purpose of the concentration limit is to protect occupants in the unlikely event that the entire re-
frigerant system leaks into the smallest room served by the system. To calculate the potential refrig-
erant concentration, divide the total refrigerant in the system by the volume of the smallest space
served by the system.
Concentration limit for R410A
NOTE: Based on ASHRAE 34-2007 and IMC-2009
*: Entire refrigerant charge in the system leaks into the smallest room.
1-1. Introduction
Outdoor units
- (09-1) -
3
25 lb/1,000 ft (0.40 kg/m
Flow of refrigerant
Indoor units
3
)
*
1. Refrigerant leakage caution