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COLUMNS
* Omission or use of incorrect snowstorm filling devices.
* Excessive exposure of desiccant to atmosphere during filling.
* Hand filling or ‘topping up’ without correct filler.
* Leaving desiccant media in bolt holes when torquing down top manifold bolts.
* Failure to remove all desiccant from column during desiccant change.
TOP MANIFOLD/OUTLET VALVE
* Incorrect torquing of column bolts - sequence tightening must be employed.
* Use of non TS dust filters on DHE Models.
* Use of sonic nozzles for flow measurement.
* Cleaning of column bolts before torquing.
* Faulty torque setting.
* Use of incorrect wire stripping tools.
CONTROL BOX
* Excessive voltage drop on incoming supply.
* Purge setting by amps, non-use of flow meters.
* Incorrect fusing used (external).
* Incorrect supply wire (incoming).
* No earth wire between earth terminal and armour cable clamp on shroud.
ADDITIONAL ITEMS
* Use of non-recommended desiccant or non-genuine domnick hunter spare parts from alternative suppliers.
* Servicing undertaken by untrained distributor/OEM personnel.
* Inability to maintain inlet pressure and temperature at levels stated for sizing.
* Not to use dryer/dryers if piped directly after a portable compressor.
FASCIA
* Depression of press buttons with sharp objects (e.g. keys, screwdrivers etc).
* Subjected to bulk water spray.
* Operation of the dryer with control fascia open.
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