Hoffmann&Hoffmann Dripmaster EDD-4C, User Manual

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Section 5: Maintenance and Troubleshooting
Table 4: Routine Maintenance
Task Frequency
Check for oil leaks Monthly
Oil filter change (the oil filter used can be an
automotive fuel filter with ¼" fittings) Every six months
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
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
display
•
Changing the mode toggle
switch (item 8 in Figure 7 on
page 13).
•
Ignore.
You want to quickly stabilize the
Dripmaster for a new drip rate
•
You just refilled the oil tank.
•
You just increased the drip rate
setting in the Normal (pump on)
mode.
•
With the Mode toggle switch
(item 2 in Figure 7 on page 13)
in automatic (
AUTO ), hold
down the Close push button
momentarily to slow down the
drip rate.
•
With the Mode toggle switch in
position AUTO , hold down the
Open push button momentarily
to speed up the drip rate.
A suspected fault has occurred in
the system; the drip rate is much
higher or lower than expected.
•
Circuit failure
•
Set the Mode switch to MAN ,
and set the drip rate manually
using the
Open and Close
push buttons. See Figure 7.