Essential Operating Facilities (EOF) HVAC Requirements

This article is about Essential Operating Facilities (EOF) HVAC Requirements as per International Codes and standards.

Essential Operating Facilities (EOF) HVAC Requirements

1. HVAC system for EOF shall be provided with standby system.
2. Buildings located in Class I, Zone 2 or Class I, Division 2 electrical areas shall be maintained at the positive pressure of 0.1 inch water gauge – (NFPA 496 Para 7.4.1)
   Note: See Item No. A3 in this SAIC for Control Building “
3. Control building shall be maintained at a positive pressure of 0.25 inch water gauge with all the openings closed.
4. Auto changeover switches shall be provided between the operating and standby units. These switches shall be capable of providing changeover and equal wear and tear between the operating and standby units.
5. If the maximum design capacity of the HVAC system is supplied by two or more normally operating units, at least one standby unit shall be provided with a capacity equal to or greater than the capacity of the largest operating unit.
6. In case the maximum HVAC system demand is satisfied by one operating unit only, the capacity of the standby unit shall be at least equal to the capacity of the operating unit.
7. Alarms shall be provided for all HVAC systems to provide warning of power loss (from the normal supply) and failure of any portion of the HVAC system.
8. All alarm devices shall be independent of the normal power supply of the HVAC system
9. Individual alarm devices shall be connected to a master alarm in a location where they can be conveniently observed by an attendant or other responsible person designated by the management of this essential operating facility.
10. In cases where the facility is not attended full time, the system shall be connected to an alarm at the security office, utilities office, fire station or other full-time service unit with which arrangements can be made to alert the person in charge of this facility.

Standards Codes and References Essential Operating Facilities (EOF) HVAC Requirements

1- SAES-K-002 – Air Conditioning Systems for Essential Operating Facilities.
2- NFPA 496 – Standard for Purged and Pressurized Enclosures for Electrical Equipment.

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