Air t'stats

John Fernandez_2

I have been called out to repair a heating problem at a local school.......big closed loop system, problem is in the thermostats, they are the air actuated type and control pneumatic valves at the radiators. The problem is in the air compressor....what PSI do these t'stats work at under normal operating conditions?

oil-2-4-6-gas

.

it depends on the stat usually the main air compressor runs about 100 psi then you go into a filter/drier then regulator most are regulators are set low -15 psi the thermostats can be tricky and different types and brands run differently depending on the valve etc...

Weezbo

lotta times water is the fly in the ointment.

see if you can get a blast of water out of the compressor... what are the magnahelix gauges reading? do you have the tools to be doing this?

tls_9

Normaly....

15 PSI, reduced after the air compressor. In many schools they have a night set back using 20 PSI switched by a time clock. The valves will be working at 3 - 8 PSI for heating. The less air pressure the more the valves open.

As stated above, water in the lines screw the works up. The compressor should always have an air dryer and auto blow downs. Oil from the compressor is also a major problem.

tom

John Fernandez_2

Weezbo was right

Lots of flies in the ointment! I got the system dialed in...........works like a charm. Thanks for the input fellas!