C E N T R I F U G A L H E A T E R - C S A
Chief Industries, Inc. 800-359-7600 COMPONENTS - 416274
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determines the reason for the high limit activation. The slave relay is reset by turning the heater
toggle switch to the off position.
5.
High Limit (#776443)
- The high limit control, located in the bin plenum, is a manual resetting
temperature limiting control, used to protect the heater, not the bin plenum, from excessive heat.
The high limit control activates the slave relay to shut off the heater if the plenum temperature
reaches 230° F (110° C).
Note
: The high limit is not an operating control; the operator must utilize
an operating control to set the firing rate for the desired drying plenum temperature.
6.
Air Switch (#785691)
- The air switch is a control that senses the flow of air from the fan to the
heater. If, for any reason, the air flow is stopped, the air switch will shut off the heater. The air
switch will keep the heater shut off until air flow from the fan is re-established. If the air switch cycles
off from a lack of air, turn the heater toggle switch off before restarting the fan.
7.
Vapor Temperature Limit (#157200)
- The vapor temperature limit is an automatic resetting
temperature limiting control used to protect the solenoid valve and regulator from being damaged
due to excessive gas temperature coming from the vaporizer. Also, the vapor temperature limit
protects the vaporizer from re-cracking the propane and causing an oil film to deposit on the burner.
The vapor temperature limit is set to shut off the heater if the gas from the vaporizer reaches a
temperature of 160°F (71°C). The control will allow the heater to reignite after the vaporizer cools.
The vapor temperature limit is only on LPGE heaters.
8.
Purge Delay with 30 sec Time Delay (#719914)
- Purge delay is a time delay relay used to delay the
energizing of the ignition transformer and solenoid valves for 30 seconds after the heater is turned on
to allow for the removal of any raw gas from the heater before ignition is tried. The purge delay calls
for a 30-second delay before ignition, regardless which control is sued to turn the heater on.
9.
Flame Sensing Relay with 30 sec Time Delay (#719914)
- The flame sensing relay has a 30
second delay and is used to break the circuit to the solenoid valves and ignition transformer if the
flame probe does not establish the presence of the flame at the burner. The operator will have to
manually reset the flame sensing relay by moving the power switch to off, before retrying for ignition.
10.
Flame Probe (#749812)
- The flame probe is a switch that is sensitive to heat, and is used to
establish the presence or absence of flame at the burner. The flame probe is used with the flame
sensing relay, as the flame safeguard circuit of the heater. The switch is opened on temperature rise.
11.
Solenoid Valves
- Solenoid valves are shut-off valves that are electrically operated. The valves are
opened automatically when energized, and are closed automatically when de-energized.
12.
Ignition Transformer (#851790)
- The ignition transformer is a transformer used to create the
6,000 secondary volts necessary for spark at the spark plug.
13.
Spark Plug (#851402)
- The spark plug is used to ignite the fuel at the burner. The spark plug will
spark while the ignition transformer is energized.
