
© 2021 Staheli West
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Open the valve to begin pressurizing the boiler.
*Tip: Make sure the boiler is full of water so it will
take less air to pressurize up to 15 psi.
The meter will show OL (Open Loop) when the HPLS
trips. If the HPLS doesn’t trip within ±0.25 psi of 15,
refer to Test 1005
Relieve pressure in the boiler by opening up one of
the pigtail valves until it is around 10 psi.
The HPLS should trip at 15 psi ±0.25 psi. This means
it is functioning as it should.
Keep pressurizing the boiler up to 20 psi or until the
pressure relief valve opens. Replace the pressure relief
valve if it does not open before 20 psi.
Use a flat head screwdriver to open up the Operating
Pressure Limit Switch.
Boiler Safety Test
Summary of Contents for DewPoint 331
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