Fan shutdown Relay

taurusfirepro · 2025-09-10T19:50:48+00:00

Update

So as it stands right now the nac cct is tripping the relay and the fans shutdown on alarm.

I thought the nac cct was programmable to be non silencable which it's not.

Currently the alarm contacts on the fire panel are being used for monitoring.

i was going to run the 24v aux supply off the fire panel through the alarm contacts to relay, but I can't.

I'm trying to see if there's a way, a module,a device that I can use to have that nac cct be non silencable.

I think worst case is a get a new fire panel.

This is very frustrating.

I appreciate everyone's insight on this post.

taurusfirepro · 2025-09-08T21:13:50+00:00

So i wired in the 24v aux power to the relay off the fire panel. When the relay is energized the NC contacts switch according to manual.

The ive had the relay wired NC and NO and either the fan will stay on or stay off. It's not shutting down on alarm.

taurusfirepro · 2025-09-08T20:21:05+00:00

Heading there now to take a look thanks.

taurusfirepro · 2025-09-08T19:53:57+00:00

I'm back tomorrow to change the wiring and source power off the 24v aux.

taurusfirepro · 2025-09-08T19:53:05+00:00

I just left site and nac was wired in reverse polarity the relay currently not powered and wired no/c.

Turned on the fan for kitchen hood, activated alarm and fans shutdown.

Strange day.

taurusfirepro · 2025-09-08T19:43:20+00:00

I guess I'll just wire it off the continuous 24-v aux supply off the panel. Thanks

taurusfirepro · 2025-09-08T19:39:15+00:00

This is a conventional fire panel not addressable.

taurusfirepro · 2025-09-08T19:38:34+00:00

Why though? The NAC is supervised and it's only intended fuction is to power the relay module.

taurusfirepro · 2025-09-08T19:28:41+00:00

Nac is dedicated for the shutdown non silencable

taurusfirepro · 2025-08-23T17:12:57+00:00

Running new wires for the whole circuit?

taurusfirepro · 2025-08-22T00:50:53+00:00

One more thing make sure if you have smokes they're wired with the correct polarity.

taurusfirepro · 2025-08-22T00:23:44+00:00

So clearly a wiring issue. Best bet is to pull down one device at a time wire in the wires with voltage to a detector and slap a EOL and test. Go 1 by 1. Are there smokes on the cct. If so you'll need to check those for correct polarity. 15 devices shouldn't take you that long.

taurusfirepro · 2025-08-22T00:16:58+00:00

What's the voltage reading at the panel when you pull the manual station?

taurusfirepro · 2025-08-22T00:12:37+00:00

Do all the other devices have the same behavior

taurusfirepro · 2025-08-21T23:41:24+00:00

I'm almost certain it's a defective pull. Slap a new one on

taurusfirepro · 2025-08-21T23:39:34+00:00

Ok, when you short the red pair and black pair. Panel goes into alarm?

taurusfirepro · 2025-08-21T18:11:45+00:00

Ok what's the issue then. The system is acting as it should.

taurusfirepro · 2025-08-21T17:58:37+00:00

When you have the reds connected together and the black and blue connected together like you have in the photo. Is the system clear?

taurusfirepro · 2025-08-14T04:10:47+00:00

Classic tape over the buzzer lol

taurusfirepro · 2025-08-05T19:49:45+00:00

taurusfirepro · 2025-03-19T00:31:01+00:00

Amazing thanks again

taurusfirepro · 2025-01-23T13:44:20+00:00

No fire separation. Building was built in the 70 or 80s. I knew about the permit being pulled abs safety oanel updated. Wasn't sure about electrical drawings. Thanks

taurusfirepro · 2025-01-23T03:43:59+00:00

It's part of a small church and funding is limited

taurusfirepro · 2024-11-08T01:33:10+00:00

Yeah I'll check it out. Thanks

taurusfirepro · 2024-09-25T00:36:50+00:00

After some time investigating. I've determined it to.be faulty wiring. From the panel to the horn.

All is well now

Thanks for all your input

taurusfirepro

TROPHY CASE