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1. Close the fuel valve at tank.
2. Allow the fuel to be burned out of the fuel line.
3. After the flame burns out, close vapor valve, regulator valve and liquid valve.
4. Turn off heater, placing toggle switch to "Off" position.
5. Allow fan to run for 2 minutes in order to cool off heater. Next shut the fan off. Finally shut
off the power at the fan service disconnect.
6. The thermostat or humidistat external plenum controls should be removed and stored in a
clean, dry place.
Firing Rate Guideline Tables
The following tables are to be used as a guide for setting the firing rate of the heater. The values are an
estimate - the actual values may vary, depending upon the bin setup and weather conditions. Once the
predicted firing rate is obtained, a bin thermometer should be used to determine the actual plenum
temperature, and then the firing rate should be adjusted to obtain the desired plenum temperature. Use the
following procedures in conjunction with the
firing rate needed for your application:
1. Determine the ambient temperature at which the heater will be operating (e.g. the outside air
temperature).
2. Find the difference of the desired drying temperature and the ambient temperature. This value
is the temperature rise desired.
3. Use a static pressure gauge to determine the static pressure at which the fan and heater are
operating.
4. Refer to the following tables which list the size of your heater, the gas used, and the temperature
rise desired. Locate the required firing rate for the operating static pressure.
5. If the ambient temperature is 50°F (10°C), then the firing rate can directly be read for your
heater, gas used, and plenum temperature for 50°F (10°C) ambient air.
Note:
As conditions vary, the firing rate should be adjusted to obtain the desired plenum
temperature.
Chief Industries, Inc. 800-359-7600 OPERATION - 416274
C E N T R I F U G A L
"Drying Temperature
Recommendations", in determining the
H E A T E R
-
C S A
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