Sterling Plumbing Cabinet Series Dehumidifying Dryer, 90 Troubleshooting, Problem, Possible cause

Chapter 7: Troubleshooting

Problem	Possible cause	Corrective action
	Dirty filter.	Clean or replace filter.
	Desiccant beds are
	contaminated by material or	Replace desiccant.
Little or no air coming from	plasticizer leaking into the
	system.
the process delivery tube.
	Blower overload has tripped.	Fix the problem and reset the
		overload.
	Blower fins filled with dust or	Remove blower side plate,
	contaminants.	clean baffles, replace.
		Stop the dryer.
		If the dryer was connected to
		the drying hopper, check to
		see if the desiccant and
Suction in delivery tube,	Phase is reversed on power	process air heater has been
pressure from the return		contaminated with resin.
	drop coming into the dryer.
tube.
		If so, replace the desiccant
		and remove any resin carry-
		over. Otherwise, change the
		phase of two legs of the
		three-phase power drop.
	Process heaters are faulty.	Check for open heaters.
		Replace if required.
	Solid-state temperature	Replace.
Loss or reduction of process	controller faulty.
		Make sure that plant
air temperature.
	Process temperature was	personnel are aware of the
	adjusted in error by plant	proper temperature set point.
	personnel.	A sign posted next to the
		controller is helpful.
	Process heaters are faulty.	Replace.
	Desiccant beds are	Replace desiccant.
	contaminated.
		Drying systems are designed
Loss or reduction in drying	Material being dried differs	for the material which was
		originally specified. Different
	from material specified at the
capacity.		materials may need a longer
	time of purchase.
		residence time or different
		drying temperature.
	Break in flex hose to/from	Inspect for air leaks; replace
		if necessary.
	drying hopper.

Cabinet Series Dehumidifying Dryer 49