Greenheck Waterwash (458292) - Manual (Page 48)

48 April 2005
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TROUBLESHOOTING
Problem: Exhaust fan is not operating or is not operating at design levels.
Items to Check Possible Solution
Is the fan receiving power? Replace fuses, reset circuit breakers, check disconnect.
Is the belt loose or broken? Replace or tighten belt.
Is the fan rotating in correctly? Have the electrician correctly wire the fan.
Is the make-up air operating? Problems with make-up air may interfere with the exhaust fan -
check the manufacturers installation manual.
Does the airflow need to be Adjust or replace pulleys to increase fan RPM, install a larger
increased? motor.
Does the fan vibrate? Clean the fan wheel/blade, replace fan wheel if damaged, check for
loose bolts, check for broken or damaged components, check for rags
and other foreign objects.
Problem: Hood is full of smoke. There is smoke coming out of the edges of the hood.
Items to Check Possible Solution
Is the fan operating at design levels? See exhaust fan section.
Is the fan correctly sized? Refer to test and balance report, design specifications and fan curves;
have an electrician check the motor amperage; try removing the filter
temporarily to see if capture improves (Make sure to replace filter to
prevent risk of fire!); switch to different filters with lower static pressure.
Are the filters in good condition? Clean filters, replace damaged filters, properly position filters.
Is there sufficient make-up air? Check make-up air unit, increase make-up air, make-up air should be
(Kitchen should be in a slight evenly distributed throughout the kitchen.
negative but not excessive-check to
see if there is a strong draft through
an open door)
Does the current cooking equipment Adjust or replace fan to match the cooking equipment load.
match the original design?
Are there multiple hoods on one fan?
One hood may be over exhausting and the other hood not drawing
enough - restrict second hood to help problem hood.
Are there closed dampers in the duct? Open dampers.
Is the ductwork complex or to small?
Change to a higher static fan, modify the ductwork.
Is the ductwork obstructed? Clear obstruction.
Is this a short circuit hood? Turn off or reduce the amount of air supplied to short circuit.
Problem: Smoke blows away before reaching the bottom of the hood.
Items to Check Possible Solution
Are there cooling fans directed at Turn off or redirect fans.
the hood or cooking equipment?
Are there ceiling diffusers directing
Move diffusers to more neutral area or replace with a diffuser that directs
air at the hood? air away from the hood.
Are there open windows or doors? Close windows and doors.
Are there cross drafts or other drafts Find source of the draft and eliminate, add side skirts to hood (test with
in the kitchen?
cardboard - use stainless for permanent side skirts); increase the
amount of overhang on the spillage side; add a 6 in. lip around the base
of the hood (test with cardboard - use stainless for permanent side
skirts); make-up air should be spread out evenly through the kitchen.
Is the hood near a main walkway? Add side skirts to hood (test with cardboard first); increase the amount
of overhang on spillage side.