Ansul System Wiring

I have been an electrician for 15 years, but have never wired an ansul system. I need wiring advice. I have the five 120v receptacles under the hood that must turn off when the ansul is activated, and an exhaust hood that must go on. The wiring on the system has four micro switches with a NO, NC, and common contacts. How do I wire this system to do what I need with shunt trip breakers. Any advice would be VERY helpful. Also, of course the exhaust fan must be switched.

I'm gonna leave the whole "search for threads" speech to someone more witty than I (MDShunk, Celtic, Speedy? Any takers?) and give you some help. There is also a link that will take you back to contractor talk, but a different thread (hence searching).

http://forums.mikeholt.com/archive/i...p/t-82683.html

....don't forget the FA tie in and the hood lights.

I've only done a few over the years and I always just have to start from the beginning and draw the circuit.

Basically, ex fan goes on, makeup air and anything elec under the hood goes off

Lets see......Two contactors and two micro switches. One for exhaust fan, one for makeup air, lights and receps???


EXF...
120V power to supply side of toggle switch and common terminal of EXF micro switch.

Load side of toggle sw to EXF contactor coil and MUA micro switch common terminal.

NO terminal of micro sw to EXF contactor coil.

MUA etc..

NC terminal to MUA coil.

Draw it....I might be off somewhere.


Any shunt trip breakers will be run thru the other micro switches. NO, NC ??? It's been 20 years since I saw a shunt trip breaker. I am thinking it ould be a NC situation.

I have done a few but the Ansul guys always had a schematic.

From an electrical standpoint they are easy. The micro switch just need to break the M-U air fan and make fan circuit as 220 said.

In all the ones I have done the lights had nothing to do with the Ansul system. They are stand alone.

Do not be afraid! It is easy to make this alot more complicated than it is. Simply set a sub panel fed by a shunt trip breaker. Have ansul system activate the shunt trip. Feed make up (supply) air,all electrical equipment and outlets, except for exhaust fan located under the hood through sub panel.

Is this a new install? If it is a Captive Aire Hood or Greenheck Hood, there may be an auxillary electrical panel included with the hood. Ask the hood installer. Is there an electric gas valve? If so, it needs to shut off when the fire suppression system trips. You need a relay to turn the gas back on. Check w/the suppression tech. The suppression tech will also have the wiring diagram.

When the exhaust fan is turned on, the make-up air is to turn on. All heat producing appliances under the hood need to shut off. Some inspectors may require the lights to shut off.

I am in the same fix. Did you get a wiring diagram for this?
I am a retired electrician after 30 yrs.

NO- Normaly open
NC- " closed
C- Common constant 110vac

MAKE SURE THE COMMON IN THE ANSUL BOX HAS A CONSTANT 110vac hot wire. (no need for neutral in the Ansul box.)

If you want something to go OFF(lights, outlets ect)

1st option NC to Contactor 110vac coil (use poles for diffrent circuts) Contactor stays closed... Ansul Activated, contactor opens ie. no power.

2nd option NO to a shunt breaker. ( a shunt breaker has 2 spaces behind the hot wires). Get a netural (white) anywhere. Wire the hot on the shunt breaker to NO...Ansul Activated , power to the shunt breaker, Trips breaker , No Power


To turn something on Wire a parrall contactor (110vac coil ) with the Fan switch and wire to NO. In effect bypassing the switch. 2 wires from the fan switch...wired top and bottom of your contactor is easy as pie.

SOMETIMES WHOLE PANEL BOXES ARE SHUNTED...The main is a shunt breaker. Wire that baby to the NO and the whole panel goes off. SWEET.
Make sure your ex. fan, or constant 110 to Ansul, is not in this panel!

Here is a wire diagram that i found online on another site that may help you. Wiring these is simple and straight forward.

Thanks for making the wiring from micro switch so easy.I did not us shunt trip breaker,just two contactors with 120 volt coils in seperate j boxes. one turns off the 3 phase power make up air and one for recp under hood did not have to turn off lights under hood firemarshal told me.This is in Texas

So you just brought a circuit to the ansul, came out of nc to your contactors?

Yes, and doing so you can control multiple contactors too whether you are controlling a 120v light, a 220v fan or a 3-phase 480 oven or all of the above at the same time. I prefer to mount a box next to the main panel for easy access to the circuits i want to control and i also used small rubber washers to mount the contactors to help keep the noise to a minimum. I do not bother using shunt trip breakers as mentioned before, any momentary loss of power will cause the breaker to trip and i would rather keep people out of the main panel if possible.

yeah, I just finished rough at this bakery that im doing and the plans just show a switch leg to a j box and light over the hood. Isn't that crazy? I like the idea of rubber washers for the contactors. Any more tips?

I have only done a couple and they were easy to do. Before i did them i did some research here and online to see how others were wiring them and the upsides and downsides to how they can be wired.

Someone else may chime in with some other tips.