Greenheck Waterwash (458292) - Manual (Page 5)

5 April 2005
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Fire Mode (Optional):
The waterwash system also provides water spray for the exhaust plenum when the system is in fire mode. This is
in addition to the hood’s automatic fire suppression system. When the fire suppression system discharges, it
activates the waterwash system (without the detergent) and the optional continuous cold water mist to spray
water within the exhaust plenum and turns on the fan circuit. The system will shut off when the fire protection
system is reset. It can also be shut off manually by turning off the water flow in the waterwash control station.
Exhaust fan will be on, Supply fan off
Waterwash Hood
Junction Box -
Hood Lights
Exhaust Duct Collar
Drain Pipe
Waterwash
Control Station
Hot Water Supply
to Control Station
Optional
Cold Water Supply
to Control Station
Vacuum Breaker
Detergent Line
Hot Water/Detergent to Hood
Detergent Check Valve
Optional Continuous Cold
Water Mist Supply Line
Internal components of hood
and control station are factory
piped and wired. All external
piping and wiring is by others.
Fig. 1 115 VAC 20 AMP service
Fire Sup. System NC Switch
Fan Control Center
Opt. Solenoid Valve
for Seq. Wash
Wiring to:
The system shown includes
a vacuum breaker for
backflow prevention. Some
state plumbing codes
require a reduced pressure
backflow preventer. See
page 7 for detailed control
panel layouts of each type.
Typical Installation: