D-EIMWC003H02-18_02EN - 10/34
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The positioning of the detector shall be done with due consideration of local airflow patterns, accounting for location
sources of ventilation and louvers. Consideration shall also be given to the possibility of mechanical damage or
contamination.
•
At least one detector shall be installed in each machinery room or the occupied space being considered and/or at
the lowest underground room for refrigerants heavier than air and at the highest point for refrigerants lighter than
air.
•
Detectors shall be continuously monitored for functioning. In the case of a detector failure, the emergency sequence
should be activated as if refrigerant had been detected.
•
The pre-set value for the refrigerant detector at 30 °C or 0 °C, whichever is more critical, shall be set to 25 % of the
LFL. The detector shall continue to activate at higher concentrations.
Refrigerant
LFL
Pre-set alarm
R1234ze
0,303 kg/m
3
0,07575 kg/m
3
16500 ppm
•
All electrical equipment (not only the refrigerating system) shall be selected to be suitable for use in the zones
identified in the risk assessment. Electrical equipment shall be deemed to comply with the requirements if the
electrical supply is isolated when the refrigerant concentration reaches 25 % of the lower flammable limit or less.
•
Machinery rooms or special machinery rooms shall be
clearly marked
as such on the entrances to the room,
together with warning notices indicating that unauthorized persons shall not enter and that smoking, naked light or
flames are prohibited. The notices shall also state that, in the event of an emergency, only authorized persons
conversant with emergency procedures shall decide whether to enter the machinery room. Additionally, warning
notices shall be displayed prohibiting unauthorized operation of the system
•
The owner / operator shall keep an updated logbook of the refrigerating system.
The optional leak detector supplied by DAE with the chiller should be used exclusively to check
refrigerant leakage from the chiller itself
