Fire Service Overlays
In accordance with the currently adopted (in Florida) ASME A17.3 1996 edition elevator code, any elevator with a rise of over 25′ (from the main egress landing) requires Fire Fighter’s Emergency Operations that are up to, at a minimum, the standards of ASME A17.1 1987 edition. We’ve covered that to great extent on this site, and you can search this site in the search bar in the upper right hand corner by typing in “A17.3″ for more information.
What we haven’t covered to great extent, are your options.
Retro-fitting older systems (systems installed prior to 1987 and that have not undergone any control system modernization) can be accomplished by integrating an overlay type add-on panel with the existing control system. While this type of application can undoubtedly help your elevators to achieve code compliance, there are still many things to consider. “Fire Service Overlays” can be installed for a modest sum, and always for a fraction of a complete controller replacement. The only problem with such an installation is that it is, for lack of a better word, a “band-aid”. What you’ll essentially get in return for your investment is an additional control system on top of (or wired into) your existing control system. There is no real “upgrade” to speak of; merely additional circuitry. Your old controller remains, and ultimately when your control system needs to be replaced, the overlay previously installed would have to be disposed of – along with the money you spent to purchase and install it.
HOW DOES IT WORK?
Installation of a “Fire Service Overlay” is accomplished in multiple stages:
1. The overlay is connected to a voltage source common to the existing control system.
2. The logic section is connected to each controller – usually through terminal strips on the existing controller
3. The relays on the Overlay are paralleled to the existing controller relays so that they may communicate with each other.
4. A new lobby operating panel and a new car operating panel are provided that meet the requirements of current code. This includes the proper key switches (zone key if required) and the proper buttons (door close, door open, call cancel, phase II switch, buzzer, fire recall light and stop switch). The Overlay adds the additional circuitry needed to control these new components.
5. And of course the building fire alarm system. This includes, but is not limited to, smoke detectors on every floor in front of the elevator(s), smoke and/or heat detectors in the machine room, detection means in the hoistway (if sprinkled), and the necessary relays and control panels required for their function. Depending on the height of the building, other emergency communications may be required, but we’ll cover that in the next article.
Before making any decisions or taking the advice of your elevator maintenance service company, it is strongly recommended that you employ the services of a Qualified Elevator Consultant to survey your equipment. Not unlike a car, elevators can rack up a ton of mileage in a short span. Some buildings get far more use from the elevators than others. Hospitals, for example, have elevators that run almost non-stop. As a result, the life expectancy of those elevator systems are much less than that of a seasonal condominium. Another factor to consider would be the type and model of control system you have installed on your elevators. While we are hesitant to point out or champion any particular control system, there are indeed some controllers that are more durable than others. Parts for certain control systems are also more readily available than others. Is your elevator hydraulic or traction? In what shape is the cab, door equipment, signal fixtures, machines, etc.? A Consultant with years of experience in the field will be able to inform you of these variables before assisting you in a decision.
Often times it is far more practical in the long run to replace the controller and meet the requirements of Fire Fighter’s Emergency Operations, as well as all of the relative codes necessitated by a controller change. In doing so, you will maximize your investment in the equipment and see a bigger return in asset retention on your capital expenditure.
Of course difficult financial times have made it near-to-impossible to fund a project that requires an elevator modernization; because, as we have covered in previous articles, the services of an electrician and fire alarm company are also required to achieve code compliance. Sometimes that can cost nearly as much as the elevator modernization itself. That said, it is extremely important to understand that a “Fire Service Overlay” or a complete controller change both require the installation of a code-compliant fire alarm system to function correctly – and also to pass an elevator alteration inspection.
We will delve into the requirements of a code compliant fire alarm system at some point, but it should be noted that these requirements differ slightly from jurisdiction to jurisdiction – let alone from State to State. It may be practical to get a “guest blogger” for these requirements who specializes (and is licensed) in fire alarm systems. If you’re a fire alarm systems installer or provider, please – feel free to submit an article for publication on this site and we’ll give you all of the proper credit, kudos and exposure.
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Mandatory Upgrades required to meet code