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PCU Fire System
Pollution Control Units require a fire system to be installed for Type 1 applications. Current International
Mechanical Code (IMC) requires that the fire system be installed by the manufacturer (2018 IMC). CORE
and EWC fire systems are available for the PCU. PCU fire systems use electric sensors set at 360°F to
activate the fire system. Outdoor EWC Systems require a climate controlled utility cabinet to ensure that
the fire system does not drop below 32°F and does not exceed 130°F. See below for more information
about outdoor installations. It is highly recommended that the PCU fire system be interlocked to the
corresponding hood fire system so that if the hood system activates, the PCU system activates. Reverse
activation requirements are determined by local code or at the discretion of the Authority Having
Jurisdiction, but are recommended for safety.
In the event that the fire system is accidentally activated, all disposable filters must be replaced and the
pre-filter cleaned. The water or chemical agent used in the fire system can cause the filters to fail
prematurely.
In the event that a fire occurs in the ductwork leading to the PCU or inside the PCU, the following must be
completed.
• The unit must be cleaned of all fire suppression chemicals and grease.
• The filters must be replaced, this includes the pre-filter.
• If an ESP module is present, the ESP cells must be removed, and cleaned in warm soapy water. Wash
cells until all chemical residue is removed. ESP pre and post filters must be replaced. When re-
installing cell(s), make sure to install with the airflow in the correct direction as indicated on the cell.
• If any of the gasketing is damaged, replace the gasketing between modules and between the doors.
• If any of the components that make-up the Pollution Control Unit are damaged by fire, then that
component must be replaced and inspected by factory trained service personnel.
Installation, commissioning, or resetting of the fire system must be done by a licensed fire system
installer. Use the guidelines set forth by the appropriate fire system manual; PCU with CORE Fire
Suppression System manual, Model TANK (Electric Wet Chemical) Extinguishing System, or other
fire system manufacturer.
For electric wet chemical fire systems for PCU, external piping that connects the PCU fire system nozzles
to the fire system tanks is factory-installed using Grade L 1/2” copper tubing and pro-press fittings. If a
remote (wall mount) EWC fire system is utilized, distribution piping shall be Grade L 1/2” copper tubing and
pro-press fittings or 3/8” NPT Schedule 40 black iron, chrome-plated, or stainless-steel pipe and fittings. If
distribution piping is exposed to an outdoor environment it must be Grade L 1/2” copper tubing and pro-
press fittings or 3/8” NPT Schedule 40 stainless-steel pipe and fittings.
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