Search found 718 matches

by Retired STR-SG
Mon May 21, 2018 1:03 pm
Forum: Fire Alarm General Discussion
Topic: School Shooting
Replies: 33
Views: 424

Re: School Shooting

There are provisions in NFPA 72 for delayed notification fire alarm systems. There are pre-signal, positive alarm sequence, and alarm verification for smoke detectors. Pre-signal and positive alarm sequence have specific provisions for having a signal in a constantly attended location and qualified ...
by Retired STR-SG
Mon May 21, 2018 12:52 pm
Forum: General Discussion
Topic: Delayed startup with the air conditioner
Replies: 15
Views: 421

Re: Delayed startup with the air conditioner

Update. I wanted to be sure the condensate pan clean up and the chemical tablets took care of my overflow issue. Instead of reconnecting the pipe to the outside I let the water drip into a bucket. I got the unit back in service around noon. From then to 8 PM the bucket filled to the 2 gallon mark. I...
by Retired STR-SG
Sun May 20, 2018 12:42 pm
Forum: General Discussion
Topic: Delayed startup with the air conditioner
Replies: 15
Views: 421

Re: Delayed startup with the air conditioner

No electrical problems, but.... Last night I happened to pass by the furnace closet just as the AC shut off. I heard the sound of water pouring out. Sure enough there was a puddle on the floor under the unit. It was late and the AC was not going to run much overnight so I let it be until morning. Pl...
by Retired STR-SG
Fri May 18, 2018 7:24 pm
Forum: Fire Alarm Help
Topic: 4005 Dact
Replies: 1
Views: 40

Re: 4005 Dact

DIY work on fire alarm systems actively protecting life and property is discouraged. Many states and municipalities have licensing laws with requirements that fire alarm service companies have to meet. That is an assurance that the company has the knowledge to properly service the system. Using the ...
by Retired STR-SG
Thu May 17, 2018 12:47 pm
Forum: Fire Alarm General Discussion
Topic: Why does the 4050 80 no longer meet building codes?
Replies: 29
Views: 523

Re: Why does the 4050 80 no longer meet building codes?

My only question is, is that an American law to replace the entire FA system if it is defective? Just cause here in Canada, we have replaced several old panels with brand new ones, but left everything else in place. Like example, we replaced an Edwards 2280 with a brand new Vigilant panel. But, we ...
by Retired STR-SG
Sun May 13, 2018 11:30 am
Forum: Fire Alarm General Discussion
Topic: Wheelchair fire evacuation from multiple story buildings.
Replies: 2
Views: 79

Re: Wheelchair fire evacuation from multiple story buildings.

For some years building codes have required new construction and renovated buildings to have Areas of Refuge. These areas must be hardened against fire and smoke penetration. They must have a two way communication system to a place constantly attended. Often this is a pressurized stairwell with larg...
by Retired STR-SG
Sat May 12, 2018 9:37 pm
Forum: Fire Alarm General Discussion
Topic: Is this a bad idea? SIZE WARNING sorry
Replies: 11
Views: 266

Re: Is this a bad idea? SIZE WARNING sorry

This is what I see on my computer looking at your post. Seems some adjustment is needed to your picture account.
by Retired STR-SG
Tue May 08, 2018 5:58 pm
Forum: Fire Alarm Help
Topic: Fire Alarm Panel Surge
Replies: 13
Views: 213

Re: Fire Alarm Panel Surge

The shorting of the wires in the drawing shorted across D1 or D3 in the bridge drawing in my previous post. That would throw AC into the DC circuits. Not good. The "huge woosh" could be from several things that could be damaged. Examples would be electrolytic filter capacitors or regulator chips. Th...
by Retired STR-SG
Tue May 08, 2018 3:21 pm
Forum: Fire Alarm Help
Topic: Fire Alarm Panel Surge
Replies: 13
Views: 213

Re: Fire Alarm Panel Surge

The bridge rectifier has 4 diodes in it. Each should be checked both forward and reverse on the diode check scale. There should be some conduction reading forward biased and and no conduction in reverse. What the reading on the meter is will be unique to the brand and model of the meter. They are al...
by Retired STR-SG
Tue May 08, 2018 11:17 am
Forum: Fire Alarm Help
Topic: Fire Alarm Panel Surge
Replies: 13
Views: 213

Re: Fire Alarm Panel Surge

I looked at the bridge rectifier in my 4010. It is a GBPC3501 which is a 100 volt 35 amp bridge. The quick specs are below.
Link to complete datasheet.
http://www.onsemi.com/pub/Collateral/GBPC3510-D.pdf
by Retired STR-SG
Sat May 05, 2018 8:28 am
Forum: General Discussion
Topic: Delayed startup with the air conditioner
Replies: 15
Views: 421

Re: Delayed startup with the air conditioner

The source of the water is condensation from the A/C. As warm humid air is blown through the evaporator coil the moisture in the air condenses on the coil. The A/C unit has an internal pan under the coil to catch the condensate and drain it through a pipe to a drain or just outside through the wall....
by Retired STR-SG
Thu May 03, 2018 7:02 pm
Forum: Fire Alarm General Discussion
Topic: Why does the 4050 80 no longer meet building codes?
Replies: 29
Views: 523

Re: Why does the 4050 80 no longer meet building codes?

Cool! That’s very interesting that the had a 4208AX! But where would I get a diode and what would I get what’s the name ohms volts reseistense etc.? also my bulb is burned out. Where would I get a 24VDC bulb? i think it’s a screw in type. It’s defenatly a 24VDC unit thus the model number a 4050-80....
by Retired STR-SG
Thu May 03, 2018 6:33 pm
Forum: Fire Alarm General Discussion
Topic: Why does the 4050 80 no longer meet building codes?
Replies: 29
Views: 523

Re: Why does the 4050 80 no longer meet building codes?

OK but now I have to ask because I am curious how long did they work on the bill before presenting it. Just wanna get a feel for how long this would have taken. The excerpt below is from: https://en.wikipedia.org/wiki/Americans_with_Disabilities_Act_of_1990 The ADA has roots in Section 504 of the R...
by Retired STR-SG
Thu May 03, 2018 4:12 pm
Forum: Fire Alarm General Discussion
Topic: Why does the 4050 80 no longer meet building codes?
Replies: 29
Views: 523

Re: Why does the 4050 80 no longer meet building codes?

A 4208 with 120 VAC flashing lights was typical for the time. That was especially true for the 4208AX systems using series AC horns operated by "H" modules. The 4050 light plates came in several variations as shown below. If the flasher motor in the panel gave up we would install the flasher board f...