Unified Brands VENTILATION SYSTEMS specifications E. Fire Dampers 1. Fusible Link Type

To adjust air intake slot, turn nuts to loosen, move air adjustment baffles up or down until the desired slot opening is obtained, and tighten nuts.

E. Fire Dampers

1. Fusible Link Type

Some ducts are protected by fire dampers which are activated by a fusible link rated at 360οF exhaust and 286οF supply When this temperature is exceeded, the fusible link melts allowing the fire damper to fall closed. This linkage should be inspected and the fusible links replaced annually. Fusible links in the exhaust duct collar are readily accessible by removing the baffle filters [Models AF] or grease extractor modules [Models AX]. [Refer to fig. 20 and 24] An access plate is provided for access [supply] duct collar for all models.

fig. 24 Electro-Mechanical Type [Refer to fig. 24] Some ducts are protected by fire dampers which are activated by heat sensitive thermoswitches located near the duct inlet. These switches close electrically at temperatures above 300ο F and activate a solenoid which releases the damper, and energizes a relay which activates the plenum auto wash/fire extinguishing spray and deactivates the fan. In the event of a loss of power, the damper assembly also contains a fusible link, set at 360οF.

The damper can be manually closed by pulling down on the red knob at the end of the damper reset arm and allowing it to swing away from the plenum.

If the damper has been activated by excessive temperature, it cannot be reset until the temperature has dropped below 300ο

F.After the temperature has dropped below

300οF, the damper can be reset and opened by pushing the damper reset arm toward the plenum until it latches.

If the fusible link has melted, it must be replaced before the damper can be reset. An access plate is provided.

When the damper is closed manually or if the fusible link melts and causes the damper to close, the fan and auto wash down are not affected.

When the damper closes due to activation of the thermoswitch, the fan[s] will shut OFF and the auto wash will actuate.

F.Air Make-Up [Supply] Plenums

Ventilators may be supplied with four [4] different Air-Make-up plenums. Air is controlled by grill registers or a special E-Z Breeze perforated panel.

1. Grill Registers [Refer to fig. 25]

Grill registers are located for external discharge or both internal and external discharge. Internal register have fixed louvers for proper "Short Cycle" of air. External registers have four-way louvers for adjusting direction of air flow to suit job requirements. Grill registers have opposing blade dampers located on the rear of the

FIRE DAMPER

register. The airflow may be adjusted by turning the damper adjustment screwhead located just behind the louvers as shown in fig. 25.

fig. 25

2. E-Z Breeze [Refer to fig. 26]

The E-Z Breeze plenum is specially designed to slow the velocity of the supply air to minimize the energy costs incurred for tempering the air. The front perforated panel is removable for cleaning. Screws are provided to secure the panel in place after cleaning.

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