Where to install pressure relief air switch on model 242?

by Tom Crane
(Canisteo, NYm USA)

I put my relief switch above the tank valve so when the compressor switch opens it will release the air in the piping and the air compressor heads (Ingersoll Rand 242).


I thought this was right but won'[t this, in fact, let all the air out of the system above the check valve and make the compressor switch turn back on because of low pressure to the switch? Won't it just cycle?

Comments for Where to install pressure relief air switch on model 242?

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Oct 14, 2016
Model 242 Pressure Relief
by: Doug in s.d.ca

Too bad my drawing got pooched - looks like it stripped leading spaces. Bummer.


Good to hear you've got sorted anyway.


Oct 14, 2016
Model 242 Pressure Relief Air Switch
by: Tom Crane

Thanks for your information. Problem solved!

Oct 13, 2016
Where to install pressure relief air switch
by: Doug in s.d.ca

The nomenclature is a bit confusing, but if I understand you, yes, it would cycle start and stop then almost immediately come back on for a short period, and so on.

You need to arrange your tank and the pressure switch so the switch sees the tank pressure, and not head pressure. So:


pump---|--check valve--|--tank----air out
| |
| |
-----------------------------pressure switch
unloader sensor
port port

Hope that comes out ok when posted and helps.

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