Stalling Elevator Recall

GoldDigger

Moderator
Staff member
Location
Placerville, CA, USA
Occupation
Retired PV System Designer
The situation is addressed by designing one of the elevator cabs to be a Firefighters Access Elevator. That comes with 2-hour construction all around and the shunt is omitted.
And for a building with only one elevator, the firemen should probably not be using it during a fire anyway!?
 

GoldDigger

Moderator
Staff member
Location
Placerville, CA, USA
Occupation
Retired PV System Designer
Also, before the firement arrive we would hope that there has been a local alarm and that the residents/tenants have been warned not to use the elevator under those circumstances, which may have been recalled already in any case.

The only situation that is tricky is if NO other sensors in the building have tripped at the time the heat detector goes off.
Sounds like just having a smoke detector in addition to the heat detector either mitigates or compeletely resolves the hypotheticals we have been struggling with.

Also, that the heat detector triggered recall should happen even if the elevator is on Firemen's Key operation at the time?

We have been concentratring on one part of what has to be an entire integrated system of actions.
 
Last edited:

gadfly56

Senior Member
Location
New Jersey
Occupation
Professional Engineer, Fire & Life Safety
Also, before the firement arrive we would hope that there has been a local alarm and that the residents/tenants have been warned not to use the elevator under those circumstances, which may have been recalled already in any case.

The only situation that is tricky is if NO other sensors in the building have tripped at the time the heat detector goes off.
Sounds like just having a smoke detector in addition to the heat detector either mitigates or compeletely resolves the hypotheticals we have been struggling with.

Also, that the heat detector triggered recall should happen even if the elevator is on Firemen's Key operation at the time?

We have been concentratring on one part of what has to be an entire integrated system of actions.
For the first bolded item, you almost always have a smoke detector anywhere you have a heat detector. It is unusual to run elevator recall on heat detection, not to say, probably not code-compliant. Unless you have a case where a smoke detector cannot be used due to environmental conditions. Smoke detectors are likely to activate long before heat detectors and will initiate Phase I recall. In most cases, general alarms do not initiate elevator recall. In fact, the code specifically says only a limited number of devices (elevator lobby, machine room, and elevator hoistway) are permitted to start recall, unless the AHJ specifically requires it.

In the second case, elevator manufacturers as well as the code committees will have to hammer this out. What happens if you have a hose team on the floor and the elevator is their only means of egress? Suddenly the door closes behind them, and they are about to have a really bad day.
 
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