D-EIMHP01702-23_00EN- 16/72
▪ Be either in the air flow with the motor outside the airflow or rated for hazardous areas (according to the
assessment).
▪ Be located to avoid pressurization of the exhaust ductwork in the machinery room.
▪ not cause sparks to occur if it contacts the duct material.
o Airflow of the emergency mechanical ventilation shall be at least:
V = 0,014 × m2/3
Where:
is the air flow rate in m3/s
is the mass of refrigerant charge, in kg, in the refrigerating system with the largest charge, any part of which is
in the machinery room
It is a conversion factor
o Mechanical ventilation shall be operated continuously or shall be switched on by the detector.
• Detector shall automatically activate an alarm, start mechanical ventilation, and stop the system when it triggers.
• The location of detectors shall be chosen in relation to the refrigerant, and they shall be located where the refrigerant
from the leak will concentrate.
• 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.
• 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
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