How It Works

INDOOR UNIT TYPE: there are four types of refrigerant containing indoor appliances for flammability
Height factor for indoor unit	Floor Mounted	0.6
	Window	1.0
	Wall Mounted	1.8
	Ceiling Mounted	2.2

LOCATION CLASSIFICATION: there are four equipment location classifications
	Location	Examples
Class I	all refrigerant equipment is located within the occupied space	Fridge, freezer, window unit, portable unit
Class II	Indoor unit(s) and pipework is in conditioned space and all compressors and pressure vessels are in a machinery room or in open air	Split system, evaporator with remote condenser
Class III	all refrigerating equipment is located in a machinery room or in open air	Chiller, rooftop unit
Class IV	all refrigeration equipment is in a ventilated enclosure	Unitary package appliance

ACCESS CLASSIFICATION: there are three access types
	Definition	Examples
A	People may sleep; The number of people present is not controlled; Any person has access without being personally acquainted with the personal safety precautions	Hospitals and nursing homes prisons, theatres, lecture halls, supermarkets, restaurants, hotels, transport terminals ice rinks
B	Only a limited number of people may be assembled, some of them being necessarily acquainted with the general safety precautions; May be a room or part of a building	Laboratories Places for general manufacturing Office buildings
C	Not open to the general public where only authorised persons are granted access; Authorised persons are acquainted with general safety precautions	Refineries Non-public areas in supermarkets Manufacturing facilities (e.g. chemicals, food) Cold stores and abattoirs

CATEGORY CLASSIFICATION: there are three category types
	Definition
Human comfort	Air treatment for occupants
Other application	Data rooms, archives, storage, cold room
<1 Person per 10 m²	Authorised access risk aware

OTHER CRITERIA: additional design considerations
Selection	Choice	Effect
Compressor	Open air or machinery room	Requirement for emergency ventilation
Underground	Yes	Reduced charge limit restriction
Calculation method	C.2 or C.3	C.2 flammability; C.3 refrigerant concentration
Emergency ventilation	Yes	Emergency ventilation rate m3/h
Multiple indoor unit check	Indoor versus outdoor capacity	25% capacity restriction
Effect on flow down	Refrigerant charge versus floor volume	Concentration limit restriction
Air change rate	Air change rate versus room volume	Ventilation rate m3/h

Warnings on Refrigerant Leakage

R32 refrigerant is used in the air conditioner has a classification A2L lower toxicity lower flammability rating. If R32 refrigerant leaks and comes into contact with fire or heating part, it will create harmful gas and there is risk of fire. R32 refrigerant poses a potential risk of suffocation if its concentration should rise excessively. If an air conditioner system is installed in a small room, select a suitable model and installation procedure so that if the refrigerant accidentally leaks out, its concentration does not reach or exceed the limit. In a room where the concentration may exceed the limit, create an opening(s) with adjacent room(s) (that cannot be closed), or install mechanical ventilation combined with a gas leak detection device.

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R32 Alternative for risk management in occupied spaces Class II

Multiple indoor check: single indoor ≤ 25% of rated outdoor capacity Largest Indoor rating kW Outdoor unit rating kW

Installed Refrigerant Concentration: RCL Limit: 0.061 QLMV Limit: 0.063 QLAV Limit: 0.15