device and a fused control transformer having a 120-volt AC
secondary for connection to the [boiler] [incinerator] local
hopper heater control panel. Provide thermostats with a set point
range of 38 to 260 degrees C 100 to 500 degrees F. Thermostats
shall measure hopper skin temperature using ungrounded, Type J
thermocouples. The local hopper heater control panel cover shall
contain the following devices.
(1)
"START UP," "ON LINE," "OFF," "AUTO" selector switch.
(2)
120 V "ON" red light with integral transformer.
(3)
120 V "LO TEMP" alarm white light with integral transformer.
(4)
Device and enclosure nameplates.
Wire the selector switch for the following system operation:
(1)
"START UP":
All elements on (includes throat heater).
(2)
"ON LINE":
All elements on (includes throat heater).
(3)
"OFF":
All elements off.
(4) "AUTO": Control functions transfer to Master Hopper Heater
Control Panel.
c.
Master Hopper Heater Control Panel: Provide panel(s) containing
relays, contactors, circuit breakers, control transformers, and
other devices required for complete control of [each] hopper
heater system. Locate Master Hopper Heater Control Panel(s) in
the control room. Panel components shall be factory installed and
wired in a NEMA ICS 6, type 4 enclosure and shall include the
following:
(1)
A main circuit breaker.
(2) A circuit breaker and contactor alarm relay with two normally
open contacts. The contactor shall have a 120-volt operating coil.
(3)
"START UP," "ON LINE," "OFF," selector switch for each hopper.
(4) 120 V red "ON" light and 120 V white "LO TEMP" alarm light
with integral transformers.
(5) Auxiliary relays and equipment required for operation of the
heating alarm systems.
(6)
Device and enclosure nameplates.
(7)
Fused control transformer having a 120 volt AC secondary.
2.2.5
Fly Ash Level Alarms
**************************************************************************
NOTE: The nuclear detector radiation should not
exceed 6x10-7 sievert per hour 0.06 mR/Hr. The
designer must contact the safety department of the
using activity to coordinate the limit of the
SECTION 15861N
Page 26
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