Hoffman Media EDD-4C manual Maintenance and Troubleshooting, Routine Maintenance Task, Frequency

Section 5: Maintenance and Troubleshooting

Table 4: Routine Maintenance

Task

Check for oil leaks

Oil filter change (the oil filter used can be an automotive fuel filter with ¼" fittings)

Check for normal operation

•The displayed drip rate is equal to the Normal (pump on) mode drip rate setting, within a -1, +2 digit tolerance

Frequency

Monthly

Every six months

Weekly

Table 5: Troubleshooting

Problem	Possible Cause	Solution
The display and LEDs are not lit.	• The unit is not powered.	• Check power in the connection
		box.
An unusual result appears on the	• Changing the mode toggle	• Ignore.
display	switch (item 8 in Figure 6 on
	page 13).
You want to quickly stabilize the	• You just refilled the oil tank.	• With the Mode toggle switch
Dripmaster for a new drip rate		(item 2 in Figure 6 on page 13)
		in automatic (AUTO), hold
		down the Close push button
		momentarily to slow down the
		drip rate.
	• You just increased the drip rate	• With the Mode toggle switch in
	setting in the Normal (pump on)
		position AUTO, hold down the
	mode.
		Open push button momentarily
		to speed up the drip rate.
A suspected fault has occurred in	• Circuit failure	• Set the Mode switch to MAN,
the system; the drip rate is much		and set the drip rate manually
higher or lower than expected.		using the Open and Close
		push buttons. See Figure 6.

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