and include the following:
a.
One control temperature thermostat (with bulbs and 1524 mm 60 inch
flexible cable capillaries).
b.
One low temperature alarm thermostat (with bulbs and 1524 mm 60
inch flexible cable capillaries).
c.
One high temperature alarm thermostat (with bulbs and 1524 mm 60
inch flexible cable capillaries).
d.
One main 3 pole [_____] V circuit breaker.
e.
One individual fuse circuit protector for the [_____] V power
circuit to each local hopper heater terminal box.
f.
One [_____] V/120 V dry control transformer with one secondary
lead fused and the other secondary lead grounded.
g.
One 600 V contactor with a 120 V operating coil for each
thermostatically controlled heater circuit.
h.
Magnetic contactor and alarm relay with two normally open contacts.
i.
Terminal blocks for termination of control and alarm circuits
including 10 percent spares on each block.
j.
Auxiliary relays for automatic operation of the heater system
terminal blocks for power, control, and alarm circuits.
k.
Throat heater surface thermocouples, one thermocouple per hopper
heater.
Provide each local hopper heater control panel cover with the following:
a.
"ONLINE," "OFF," "AUTO" selector switch.
b.
120 V "HIGH LEVEL" red light with integral transformer, one each
zone.
c.
120 V "ON" green light with integral transformers, one each zone.
d.
120 V "LO TEMP" white light with integral transformer, one each
zone.
e.
Device and enclosure nameplates screwed or riveted to panel.
Wire the selector switch for the following system operation:
a.
"ONLINE":
Heaters operating (includes throat heater).
b.
"OFF":
All elements off.
c.
"AUTO": Control functions transfer to Master Hopper Heater
Control Panel.
2.8.7
Master Hopper Heater Control Panel
Provide a factory wired master hopper heater control panel containing
SECTION 15863N
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