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6. Dryer Start-Up
PNEG-552 100 Series Dryer 31
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 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. Pressure up to 25 lbs. may be
required. Natural gas does not have a regulator, but uses a LARGE BALL VALVE close to the
vertical supply line for adjustment. Pressure up to 18 lbs. may be required.
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
LP gas regulator or the Natural Gas hand valve 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 ways. First, by loosening the bolt in the hinging mechanism and
swinging it to a hotter or cooler position. Second, by loosening the two 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.