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
Page 16
29.
Burner High Limit Wire (#9701961)
- Wiring that connects the burner high limit and burner
exhaust limit to the control box.
30.
Neutral Terminal Block 3 POLE (#850255)
- This terminal block is used as a junction block to
establish a common neutral for connection of the neutral leads.
31.
Venturi Weldment (#9415661)
- The venturi weldment creates a high and low pressure area in the
airflow, which aids the air switch in measuring air velocity.
32.
Humidistat Control (#9850982)
- The humidistat control is an electrical operating control that is
wired into the heater to cycle the heater "On" and "Off" with respect to the relative humidity of the
drying air. The humidistat control is typically set at about 50% - 60% relative humidity of the drying
air. When the relative humidity is higher than the humidistat setting, the heater is cycled "On" and is
left on until the relative humidity is below the humidistat setting. If the relative humidity of the drying
air is less than the humidistat setting, the heater is cycled "Off" until such time that the relative
humidity would become greater than the setting of the humidistat. The humidistat control is for low
temperature drying.
33.
Thermostat Control (#9851014)
- The thermostat control is an electrical operating control that is
wired into the heater to cycle the heater "On" and "Off" with respect to the temperature of the drying
air. The thermostat is set at a desired temperature, and if the drying air temperature is higher than the
thermostat setting, the heater is cycled "Off." If the drying air temperature is less than the thermostat
setting, the heater is cycled "On," and is left on until such time that the drying air temperature is
above the thermostat setting.
34.
Humidistat-Thermostat Control (#9870974)
- The humidistat-thermostat control is an electrical
operating control that is wired into the heater to cycle the heater "On" and "Off" with respect to both
the drying air relative humidity and temperature. The humidistat-thermostat control will cycle the
heater on if either the drying air relative humidity is too high, or the drying air temperature is too low
with respect to the humidity setting or temperature setting of the control.
NOTE:
The optional
external plenum controls do not function in the same manner as a thermostat in a residential house.
When the bin plenum controls reach the set point the heater is then shut off. In the off mode the
bin’s plenum temperature will drop below the set point of the control due to the rapid air change in
the plenum from the fan. The controls do not sense the instantaneous change in air temperature but
take time to reach the plenum control setting before controlling the heater operation.
NOTE:
The
firing rate must be set by the operator to verify excessive temperature is not present in the plenum.
35.
Modulating Valve
- The modulating valve is a non-electrical operating control. The modulating
valve is placed in the heater plumbing, and controls the amount of fuel burned by the heater
depending upon the temperature of the drying air. If the temperature of the drying air is lower than
the temperature setting of the modulating valve, the modulating valve opens up and more fuel is
burned to raise the drying air temperature. If the drying air temperature is higher than the
temperature setting, the modulating valve restricts the amount of fuel to the heater. The modulating
valve has an interchangeable by-pass orifice to maintain continuous low heat operation regardless of
modulating valve setting. The orifice is interchangeable for establishing lower or higher by-pass flow
through the modulating valve, depending on conditions.