a. Elevator shutdown: Power shall be removed immediately upon activation of a heat
detector in the machine room or hoistway (if sprinklers are installed). Operation of a
heat detector shall trip a shunt breaker removing power from the elevator(s) within
the common hoistway or controlled by equipment in a common machine room. Cars
sharing the same hoistway or the same machine room shall have power removed
independently from cars within other hoistways or those controlled from equipment in
other machine rooms.
Note: The industry expects that the operation of the heat detector will not trap
any occupants on the elevator because Phase I will have already placed the car
at the designated level and locked the doors in the open position. Smoke
detection required for Phase I is provided for all of the spaces where heat
detection is provided for power shut down.
b. Provide 57 C (135 F) rate compensation heat detectors within two feet of each
sprinkler in the elevator machine room and hoistway in accordance with NFPA 72.
Do not provide a heat detector for the pit sprinkler. Higher temperature rated heat
detectors may be used where local conditions warrant, however the heat detectors
must have a lower temperature rating than the sprinklers. The sprinklers in the
elevator machine rooms and hoistways must be standard response type; quick
response sprinklers are prohibited in these areas.
c. Provide a supervised signal from the activation of the heat detectors to a point within
three feet of the elevator controller or shunt breaker. This signal shall be the input to
shunt the power to the elevator.
d. Provide a 110 vac power source to the shunt breaker independent of the elevator
controller. This power circuit shall be supervised by the fire alarm system as a
supervisory signal.
Note: The shunt breaker requires 110 volts ac to operate and the source must
be independent of the elevator in accordance with ANSI A17.1. The intent of
the code is to have to a reliable power source and not to rely on one which may
be on fire. Without supervision of the 110 vac power circuit needed for the
shunt breaker, the condition of the power necessary for the shunt breaker to
operate during a fire is unknown. There have been instances where the
breaker to the 110 vac power source for the shunt breaker has been turned off
and the elevator power would not shunt upon operation of the heat detector.
3. Fire alarm system elevator interface summary: As described above, there will be four
supervised signals from the fire alarm system that will interface with the elevator system.
They are as follows (see following pictorial and the accompanying notes):
a. Input to elevator controller for Phase I recall to the designated level from actuation of
smoke detectors other than at the designated level lobby.
b. Input to elevator controller for Phase I recall to the alternate level from actuation of a
smoke detector at the designated level lobby.
c. Input to elevator main line power shunt trip breaker for power shut down from
actuation of heat detectors in the hoistway or machine room.
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