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.”