Grain Systems PNEG-1702 - Manual (Page 54)

8. Competitor Dryer Operation
54 PNEG-1702 ETL Listed GSI/FFI Portable Dryer Manual
Adjusting the Temperature
1. Press the Program (Temperatures) button until the “carrot” is above the timer to be modified.
2. Use the UP and DOWN arrow keys to change the present temperature to the desired setting. The
new temperature is automatically accepted.
3. Keep pressing the Program (Temperatures) button until the carrot disappears or press the Mode
Select button once to exit.
4. On LP and NG gas models, adjust the PRESSURE REGULATOR (high-fire) on the burner fuel
line, so that burner will reach the thermostat setting and switch to low-fire.
The approximate settings should be:
Do not set the low-fire pressure so low that a popping or fluttering sound is heard in the heater. If
popping or fluttering sound are heard, increase the pressure until the sound goes away.
On LP and NG gas models adjust the needle valve on the cycle solenoid (low-fire valve) so that the
burner maintains flame then switches back to high-fire.
5. Adjust the burner pressure so that the burner CYCLES 2 to 3 times per minute (approximately 15 to 20
seconds on HIGH and approximately 5-8 seconds on LOW). Increasing the gas pressure with the gas
regulator increases the cycling rate and lowering it decreases the rate. This is the primary way to
change the cycling rate.
Decreasing the low pressure setting with the needle valve will also increase the rate while increasing
that pressure will decrease the rate.
6. On LP gas models adjust the vaporizer so the fuel pipes going to the burner from the regulator are
warm to the touch (not hot and cold).
The vaporizer can be adjusted two (2) ways. First, by loosening the bolt in the hinging mechanism and
swinging it to a hotter or cooler position. Second, by loosening the two (2) bolts in the hinge pipe and
sliding the vaporizer in or out to a cooler or hotter position. Either one or both methods may need to be
used to get the vaporizer to the proper temperature, but the first almost always gives adequate adjustment.
Natural gas does not use a vaporizer.
LP Gas Natural Gas
High-Fire 6-15 lbs. High-Fire 6-10 lbs.
Low-Fire 2-6 lbs. Low-Fire 1-3 lbs.