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Chapter 2 - Principles of Operation
ELXC Series - Cont.
Turning Off the Exhaust Fan
Caution: Always turn off the cooking equipment and allow to cool before turning off the exhaust fan. The
chemical fire extinguishing system may discharge if the cooking equipment is on or hot when the exhaust
fan is off.
At the end of the cooking day, turn off the cooking equipment and allow to cool before turning off the ex-
haust fan. To turn off the exhaust fan push "STOP FAN" on the Gaylord Command Center (Refer to Figure
2-2-1). The Command Center control may be programmed to automatically turn off the exhaust fan at a spe-
cific time. Refer to the Operation and Maintenance Manual for the Gaylord Command Center for complete
operating instructions.
Note 1: If the Ventilator is equipped with a Gaylord Autostart Controller, the exhaust fan will stay on if the
temperature at the sensor mounted in the canopy exceeds 90°F. (Refer to Figure 2-2-2). Once the tempera-
ture drops below 90°F., the fan will continue to run for 15 minutes and then shut off.
Note 2: If the Ventilator is equipped with a Gaylord Electric Balancing Damper, designated "GEBD" or a
Gaylord combination Fire/Balancing Damper, designated "GFBD", when the fan is turned off the damper will
move from the open to closed position and remain closed until the exhaust fan is re-started. Closing the
damper saves building energy by not allowing conditioned air from drafting up the exhaust duct, or in cold
climates prevents cold air from coming down the duct and into the kitchen.
Wash Cycle
Wash Cycle - Overview
The ELXC Series is referred to as a clean in place Ventilator as it has automatic Wash Cycles that washes away
the extracted grease within the Extractors, Plenum and surrounding areas, with hot, detergent injected wa-
ter. The grease is flushed down into the Grease Gutter which slopes to a drain line which leads to the build-
ing drain system.
The Ventilator has two wash manifolds, the Extractor Wash Manifold, to wash accumulated grease out of the
Extractors, and the Plenum Wash Manifold to wash the accumulated grease out of the Plenum area (Refer
to Figure 2-4-1 and 2-4-2). The two manifolds are independently connected to the Wash Control Cabinet,
Figure 2-2-1, typically located in, or near the kitchen (Refer to Figure A-5-1 in the Appendix on page A-5 for
a typical arrangement of the Wash Control Cabinet and Ventilator). The Wash Control Cabinet houses the
Command Center, valves, detergent pump, detergent tank and other plumbing components needed to op-
erate the Wash Cycles. (Refer to Figure 2-15-1 on page 2-15 for a detailed illustration of the Wash Control
Cabinet). Two electric solenoid valves are located on the top of or near the top of each Ventilator section
(Refer to Figure A-5-1).
Wash Cycle Sequence
The two wash manifolds, Extractor Wash and Plenum Wash, operate independently of each other as the
Extractor, Grease Canal and Grease Gutter typically need washing more frequently than the Plenum area.
Timers in the Command Center are programmed to initiate either the Extractor Wash or Plenum Wash based
on the number of hours the exhaust fan has been on.
2-3
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