There is a temp sensor on the Vap to measure the coolent temp it should switch ove rwhen the coolent get to about 40Degs but you can set it to switch at 30ish as the gas will still vap at that temp.
Sounds like yours is changing to gas at a to low temp, If your Vap gos white with frost the gas is flipping over when the water temp is far to low
Correctly plumbed and with a cooling system in good working order (including appropriate anti-freeze mix) it will work at more or less any temperature. It is a myth that the gas won't evaporate at less than 30 degrees or 40 degrees or whatever, propane evaporates at well below the freezing point of water. The main issue is that the latent energy of evaporation needs to come from somewhere, which is the coolant supply to the vapouriser. Even if this water is cold, it still has plenty of energy to supply to evaporate the gas.
As long as the water doesn't freeze, it doesn't actually need to be hot -- this is why, as long as you have sufficient anti-freeze in the system (which will prevent freezing down to -20 or less), and the cooling system is in good working order with the vapouriser correctly plumbed ensuring a good continous flow of coolant through the system, you'll have no issues with the liquified gas failing to evaporate.
Think of it this way, with good flow and a correct anti-freeze mix, the vapouriser will have to cool over 10 litres of coolant to close to -20 degrees, quicker than the engine heat can replace the heat lost to evaporation (plus the usual system losses, but these should be small while the thermostat is closed). It's not an issue except in climates far colder than we see in the UK. The real reason for starting on petrol is to ensure the petrol system gets regular use, preventing it from failing, and to compensate for poorly installed systems that can't provide enough coolant flow when cold (an issue that my Omega currently has and I intend to rectify when I get time).
Author
Topic: LPG question.... (Read 1609 times)