![background image](http://html1.mh-extra.com/html/smc-networks/xlh16/xlh16_operation-manual_1299496009.webp)
heaters to prevent overheating.
With PTC type heaters, there is an initial surge of current (inrush current) after the power is supplied.
These inrush current will reduce overtime. If multiple heater assemblies are used, the inrush current to
the heaters will be magnified and care should be taken. When multiple heater assemblies or valves
are used, do not apply power to the heater assemblies simultaneously. Keep approximately 30
seconds between applications of power to each heater assembly. This will allow for incremental
spacing to prevent harmful large initial surge.
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