Technical Instructions
Document No. 155-516P25
Rev. 2, December, 1998
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9 Siemens Building Technologies, Inc.
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All pressure connection pipes must be at least ¼-inch inside diameter. For air to gas
pressure ratios over three, the air and combustion pressure connection pipes must be at
least 3/8” inside diameter. The pressure pick up conections must be flush with the inner
wall of the pipe or housing in order to sense turbulence free pressures. The gas pressure
pick up should be located at least five pipe diameters downstream of the valve. D
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. The pressure connection pipes should be as short as possible to
allow the regulator to react to sudden changes. The connection pipe for the combustion
chamber pressure must be installed so that condensing flue gases cannot enter into the
regulator but run back into the combustion chamber. If necessary, a water separator
must be installed.
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If minimum gas pressure detection is required, the
pressure switch must be mounted upstream of the
regulating gas valve to ensure sufficient gas pressure
before starting the burner. If maximum gas pressure
detection is required the pressure switch must be
mounted downstream of the valve.
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Air proving safety devices normally required to
guarantee minimum air flow must also be provided
when using the SKP70…
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In installations with negative air pressure the SKP70…
does not work unless a higher negative chamber
pressure is connected to the regulator.
•
Adjustment and indication of the gas to air ratio
•
Adjustment and indication of the bias
‘
Connection for the combustion chamber pressure sensing line
’
Connection for the gas pressure sensing line
“
Connection for the air pressure sensing line
”
Stroke indication
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