How does a Vaporstat work?

The L408J VaporStat® Controllers are line voltage pressure controllers that provide operating control or automatic limit protection for pressure systems of up to 4 psi (27.6 kPa). All models have Microswitch™ snap switches to open or close a circuit on a pressure rise.

What is a pressuretrol used for?

A pressuretrol is a control used to control a steam boiler, by setting when the boiler should begin and end firing based on steam pressure.

What is a Hartford loop?

Simply speaking, a Hartford Loop is a configuration of interconnected pipes associated with the gravity condensate return line on a steam boiler, and the point at which that condensation is re-introduced back into the boiler. It exists between the header of the boiler and the gravity return.

What should Honeywell pressuretrol be set to?

On subtractive systems, the main scale screw sets the top PSI before the boiler cuts out. You can set this between 3.0 and 15 PSI.

What is a modulating pressuretrol?

Modulating pressure operating control for regulation of liquid or air and other non-corrosive gases. • Use with steam, air, noncombustible gases, or other fluids noncorrosive to the brass or phos-bronze (300 psi models) bellows.

What pressure is steam?

Steam pressures and temperatures in current practice have reached 97–164 bar and 480–565°C or 593°C. The rate of increase in efficiency with increase in pressure becomes less as the pressure increases.

Where are equalizer pipes found?

The end of the header drops vertically below the boiler’s water line and connects into the bottom of the boiler. We call this pipe the “equalizer” because it balances the pressure between the boiler’s steam outlet and condensate-return inlet.

Why do you need a Hartford loop?

The Hartford loop is needed to prevent steam pressure in the condensate return line from forcing the liquid condensate (water) out of the boiler and back into the return piping system – something that could be a serious problem resulting in boiler water loss and boiler damage or destruction.

How does a steam loop work?

Steam passes from the boiler into the steam mains. Initially the pipework is cold and heat is transferred to it from the steam. The air surrounding the pipes is also cooler than the steam, so the pipework will begin to lose heat to the air. Insulation fitted around the pipe will reduce this heat loss considerably.

What should pressuretrol be set at?

The “main” scale on a subtractive pressuretrol is your cut-out pressure. Set that scale at 1 1/2 psig. To get to “Cut In” you have to subtract the “differential” from the “main.” So set the differential for 1 psig. This will cycle the system between 1/2 psig and 1 1/2 psig as long as the thermostat is calling.

What PSI should my Steam Boiler be at?

In most cases, it should rise to about 20 psi while its heating element operates. That’s optimal at normal temperatures. Pressure changes of a few psi one way or the other can be brought about by atmospheric conditions. Most boilers are safe up to around 30 psi, at which point seals can begin to fail.

What is LP and HP steam?

HP steam is “HIgh Pressure Steam”; (assume 1800 PSIG in our example unit) IP steam is “Intermediate Pressure Steam”; (assume 600 PSIG in our example unit) LP steam is “Low Pressure Steam”. (