VEVOR HFD-4 Bedienungsanleitung Seite 20

1.Must use a grounded power outlet.
2.Working environment temperature≤32℃, the humidity≤80%.
3.After drying finished, open the vent valve to inflate air at first, then close
the vacuum pump to prevent sample contaminated by the pump oil. If a
sudden power outage, open the vent valve immediately, and take out the
samples as soon as possible, properly stored.
4.Keep the seal ring clean, and cannot Scrub with organic solvents.
5.Replace the vacuum pump's oil after working 100 hours, check and
maintenance the pump regularly.
6. Do not frequently switch power supply and refrigerator, If the refrigerator
is shut down caused by operation, at least three minutes to wait, and then
restart the refrigerator.
The vacuum cannot
less than 15Pa
Vacuum pump
injection
Attentions
Common trouble and shooting
Check the connecting between vacuum pump
1 and dryer, if the connector fitting correct and
tightened?
2 Check vent valve, if closed totally?
3 Check the seal ring, if fitting correct?
Check the vacuum pump working condition, if
4
the oil clean?
Check if some valve not closed, the chamber
1
not in seal condition.
Check if the pump oil level too high, the normal
2
position is the middle of the gauge.
3 Check if the pump oil emulsion?
Check if the condenser's temperature too high,
4 the pump should be start after the temperature
lowered.
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