I wish to know the proper propane connection as pressure,regulator is it required before connection at heater

It is possible that the problem with your All Pro SPC 150T propane heater could be caused by a faulty gas regulator or pressure switch. The gas regulator controls the flow of propane while the pressure switch controls the temperature of the heater. You may need to replace the gas regulator or pressure switch in order to get your heater running again. Additionally, you could also check for any loose connections or clogs in the fuel line.

Assuming that you want only one tank to run out at a time, you will need to set each at a different supply pressure, then Tee them together on the delivery side of the regulators. You will need pressure-holding regulators. Pressure-relieving type will not work unless you add a one-way backflow prevention valve after the regulator in the branch that is set to lower pressure.

It should be. You should be able to replace the oriface and the regulator. Propane is at a higher pressure than natural gas.

It sounds to me like you need to increse gas pressure. Most propane fired units need at least a 11 inch water column of pressure for proper operation. This relates closely 7.5 ounces. I would have regulator checked out by qualified service techs. Thank you

Here is a link to the owners manual and page 8 and 9 tell you about the regulator.

http://www.northerntool.com/downloads/manuals/177883.pdf

You need to a 8-11WC regulator for propane and if you are using natural gas you will want to keep the pressure between 3-10WC

If this is connected to a propane bottle you want o use at least a 100lb bottle.

Thanks

Only the portable heaters that are manufactured to be used on dual fuel (nat gas/propane) can switch from one to another. If they are made for 1 type of gas only, they are not field serviceable and cannot be converted. Douglas

A pressure regulator and pipe or hose. Whoever is selling you the tank/propane should be able to help you size everything based on the tank hook-up and tank pressure. The heater nameplate will tell you the proper inlet gas pressure that the regulator will need to reduce the tank pressure to.

First I would check to be sure your propane tank(s) are not empty and valve is not turned off and that the required gas pressure is being delivered to the unit i.e. pressure line tubing is not kinked or leaking - pressure regulator is operating properly.

Another culprit could be the thermocouple is malfunctioning or is not positioned properly, hence not allowing it to sense the flame.

Propane exist in a liquid state when it is under pressure in a propane cylinder. When the valve on the propane cylinder the pressure on the liquid is reduced and the propane reverts back to gas state.

Also, regarding the tank you need....
the owners manual probably states what size you will need but, with most heater like the one you have it will require a 100 lb tank (approximately 25 gallons). You will also need an inline regulator set to 11" to 14" of water column between the tank and the heater.

a standard propane regulator should work. check on the required pressure for the unit and get a compatible regulator. try grainger supply. thermostat connections are usually 24 volt two wire, opens on temperature rise. connections on the burner relay are indicated TH-TH.