Restaurant Hood Fire Suppression Systems
- Thread starter mtn_elec
- Start date
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bdarnell
Senior Member
- Location
- Indianapolis, IN
- Occupation
- Retired Engineer
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Re: Restaurant Hood Fire Suppression Systems
Nieto, if they're anything like the units they use here, there's nothing really electrical about the system, except that, when it's activated, three things must happen:
1) The exhaust fan(s) must energize, regardless of the manual switch's position.
2) The intake fan(s) must de-energize, regardless of the manual switch's position.
3) Any electrical appliance(s) beneath the vent hood(s) must de-energize.
Having said that, the actuators used here contain a pair of Micro-switches, each S.P.D.T., and you need to know the present switching arrangement of the hood fans; 1-speed, relay or direct, etc.
Let us know this info, and help will be forthcoming.
Nieto, if they're anything like the units they use here, there's nothing really electrical about the system, except that, when it's activated, three things must happen:
1) The exhaust fan(s) must energize, regardless of the manual switch's position.
2) The intake fan(s) must de-energize, regardless of the manual switch's position.
3) Any electrical appliance(s) beneath the vent hood(s) must de-energize.
Having said that, the actuators used here contain a pair of Micro-switches, each S.P.D.T., and you need to know the present switching arrangement of the hood fans; 1-speed, relay or direct, etc.
Let us know this info, and help will be forthcoming.
Re: Restaurant Hood Fire Suppression Systems
Well. there is a fan over the roof ( this is a very small bakery in Newark City, the building is only 1 floor high) and there is another one inside the place on top of the hood that came with a light fixture and this vent hood is protecting a gas operated stove.And yes there is a box on top of the chemical container with the release mechanism and has those SPDT switches.Well more help would be really appreciated
Well. there is a fan over the roof ( this is a very small bakery in Newark City, the building is only 1 floor high) and there is another one inside the place on top of the hood that came with a light fixture and this vent hood is protecting a gas operated stove.And yes there is a box on top of the chemical container with the release mechanism and has those SPDT switches.Well more help would be really appreciated
mtnelectrical
Senior Member
- Location
- Essex, New Jersey
I forgot my password and changed my email recently so I've had to register again 
, well I was forgetting is one speed and direct no relay everything in 120 v
, well I was forgetting is one speed and direct no relay everything in 120 vRe: Restaurant Hood Fire Suppression Systems
Those switches are for whatever you and the fire code want to use them for.
Often we use one for the fire alarm, the other one will, thru a relay, de-energize the main gas solenoid and any electrical equipment under the hood. It may also de-energize a blower. Your building inspector or fire marshal should be able to give you details.
Ideally, one switch is used to trip a shunt-trip main breaker in a panel that has branch circuits that serve everything under the hood.
In addition to the inspectors mentioned, the kitchen equip people often have the information that you need, as they do this all the time. Be aware that whatever they tell you should be verified by the local inspector, as requirements can be different in different jurisdictions.
mtn_elec said:
Those switches are for whatever you and the fire code want to use them for.
Often we use one for the fire alarm, the other one will, thru a relay, de-energize the main gas solenoid and any electrical equipment under the hood. It may also de-energize a blower. Your building inspector or fire marshal should be able to give you details.
Ideally, one switch is used to trip a shunt-trip main breaker in a panel that has branch circuits that serve everything under the hood.
In addition to the inspectors mentioned, the kitchen equip people often have the information that you need, as they do this all the time. Be aware that whatever they tell you should be verified by the local inspector, as requirements can be different in different jurisdictions.
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