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  1. 10-11-2012, 07:55 PM #1
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    Peztoy
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    Testing pressure switches

    Have a customer with a 25 ton water cooled chiller that wants the high and low pressure switches tested on his refrigeration equipment. The switches are the encapsulated type. I need to confirm the switches work, not just remove wires from the switch. Customer does'nt want me running the discharge pressure up and having the suction pressure drop artificially to trip the switches. Has anyone removed all the refrigerant or added tubing or small valves to isolate the switches to make this test with nitrogen?
    I need to do the test every year.
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  2. 10-12-2012, 11:02 AM #2
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    Most encapsulated pressure switches are mounted on schroeder cores, not all call manufacturer to find out for sure. If they are just pop them off and test with nitro on a manifold. If they are not you may have to pull it down. I'd put them back on Schroeders so next year you don't have to pull it down.
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  3. 10-12-2012, 11:16 AM #3
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    Whats a shroeder core? Unless you mean shrader valve core?
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  4. 10-12-2012, 11:59 AM #4
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    Quote Originally Posted by coolwhip View Post
    Whats a shroeder core? Unless you mean shrader valve core?
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  5. 10-12-2012, 12:53 PM #5
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    lolz!
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  6. 10-12-2012, 02:43 PM #6
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    Southern Mech
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    Do not put a high pressure safety device on a valve, and low only on a king valve, not ball style.

    Would rather them be on schrader's though.

    Second calling mfg for info
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  7. 10-12-2012, 08:57 PM #7
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    Quote Originally Posted by Southern Mech View Post
    Do not put a high pressure safety device on a valve, and low only on a king valve, not ball style.

    Would rather them be on schrader's though.

    Second calling mfg for info
    Absolutely rite! Schraders only. Never ever put a high pressure safety on a valve that can be closed. Bad things can happen.
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