Propane Woes Question
Another question about the propane from the big sideways tank in a Class C. After we bought this rig recently, turned on the propane tank gas valve, and had a heck of a time getting the appliances ...
Forum Discussion
Propane system.....
Excess flow device (on a MH they are in line to LP Regulator).
If downstream line should break the high flow will trigger the Excess Flow Device causing it to trip and limit any propane flow
Propane System has only 0.4 psi in the lines downstream of LP Regulator.
VERY low pressure system
When vapor valve (service valve) at Tank is closed the lines can leak down if a appliance gas valve is faulty and leaks
Otherwise system is static...no flow so regulator is locked down
When you turn on stove top burners you are doing so to create that a demand that regulator can respond to.
But system pressure is so VERY low that it takes time plus other appliances downstream have no demand therefore no flow UNTIL you try lighting them off.
But do to safety features in each appliance (6-8 sec trial ignition--no flame proven) gas valves do not stay open very long (demand) so flow is limited until you try lighting off a few times.
the longer the system, the farther away the appliance is from LP Regulator the more attempts to light off/the more time it takes to establish that demand and flow.
So YES...everytime you valve out your propane tank you will need to go thru and establish demand/flow to place LP Regulator in FULL service.
Especially if you have a leaking gas valve on one/more of the LP appliances
You can hookup a manometer......valve propane in service.....set LP Reg for 8" WC
Close tank service valve and then watch reaction on manometer for 3 minutes minimum.
If pressure drops then you have to start checking for where leak is.
Typically you should be able to SMELL any leak.....so sniff around water heater burner, furnace exhaust port, fridge burner and stove top burners (lift up cover) and inside oven
Otherwise.....leave the propane valved in service (built in safety devices/features--more then the engine fuel system in your Class C has)
OR 'bleed' your propane system each time (establish a demand/flow on regulator)
Excess flow device (on a MH they are in line to LP Regulator).
If downstream line should break the high flow will trigger the Excess Flow Device causing it to trip and limit any propane flow
Propane System has only 0.4 psi in the lines downstream of LP Regulator.
VERY low pressure system
When vapor valve (service valve) at Tank is closed the lines can leak down if a appliance gas valve is faulty and leaks
Otherwise system is static...no flow so regulator is locked down
When you turn on stove top burners you are doing so to create that a demand that regulator can respond to.
But system pressure is so VERY low that it takes time plus other appliances downstream have no demand therefore no flow UNTIL you try lighting them off.
But do to safety features in each appliance (6-8 sec trial ignition--no flame proven) gas valves do not stay open very long (demand) so flow is limited until you try lighting off a few times.
the longer the system, the farther away the appliance is from LP Regulator the more attempts to light off/the more time it takes to establish that demand and flow.
So YES...everytime you valve out your propane tank you will need to go thru and establish demand/flow to place LP Regulator in FULL service.
Especially if you have a leaking gas valve on one/more of the LP appliances
You can hookup a manometer......valve propane in service.....set LP Reg for 8" WC
Close tank service valve and then watch reaction on manometer for 3 minutes minimum.
If pressure drops then you have to start checking for where leak is.
Typically you should be able to SMELL any leak.....so sniff around water heater burner, furnace exhaust port, fridge burner and stove top burners (lift up cover) and inside oven
Otherwise.....leave the propane valved in service (built in safety devices/features--more then the engine fuel system in your Class C has)
OR 'bleed' your propane system each time (establish a demand/flow on regulator)
