LP gas lines normally frost up because the liquid is filling the pipe and expanded to become vapor. This causes the pipe to become very cold and atmospheric vapor to condensate on pipes as frost.
- The most common problem is that the line has a restriction. This is where the frost will begin. The obstruction must be cleaned out of pipe to reduce frost.
- Strain filter being plugged will be a restriction, clean out filter in strainer.
- If a solenoid is only opening part way, take the valve apart and look for brown tar like substance that can be cleaned off with alcohol.
- Water in feed line will freeze line, add bottle of heat to line at tank valve connection.
- Vaporizer might need to be pushed further into the flame as the vaporizer is not heating the LP to proper level and pipes are cold leaving vaporizer. Note: if the pipes are too hot leaving vaporizer (over 180 degrees) this can also damage the regulators.
- Have the LP supplier add anhydrous methanol at each refill.
- If the LP storage tank is a large commercial size, throttle back the withdrawl rate, either by adding a liquid regulator or reducing the discharge valve opening on the tank.”
- If fueled by LP, check for a hole in the vaporizer or a leak in any of the pipe connections.
- Check for dirt in the solenoid valves, holding them open.
- Verify that the dryer is full of grain at all times.
- Verify all hatches are closed.
- Check for leaks in the plumbing, especially inside the dryer.
The Bleimo brand of actuator is not responding to what is shown for percentage open on the plenums page on the HMI.
- At the terminals on the Bleimo, check for 24vdc between the red and black wires. Check for 0 to 10 vdc between the white and black wires. This voltage should correspond to the percentage of valve opening as shown on the plenums screen on the HMI.
- The actuator assembly might be bound up. Crack loose the single mounting screw found on the bottom of the box to allow the box and actuator to have a little movement.
- Is the gas source adequate? Are the supply lines large enough?
- Check for water in the lines by checking at the drip legs.
- Check that all valves are functioning properly.
- Check strainer.
- Check for adequate pressure provided by the regulator(s).
- Burner holes need cleaning. A visual inspection is not adequate. You must physically probe each hole. A Maxon burner uses to different hole sizes. They are drill size #47 (5/64”) and #50. A midco burner has 1/8” gas holes and #42 air holes.
I have a Natural Gas Canadian model dryer. When the burner attempts to ignite, the safety circuit dies.
When the burner attempts to ignite and the gas solenoids open, the gas pressure drops, triggering the Low Gas Pressure safety switch to open, interrupting the safety circuit. Slightly increase the gas pressure by adjusting the regulator.
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