DYNAVAC NovaDryer-DHF400 Kurzanleitung für Installation und Betrieb - Seite 9

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9‐2. If vacuum degree on the main menu is lower than 900 (Pa) but higher than Pre‐vacuum pressure set by the user(for

sample. 30Pa) when "Vacuum Alarm" keeps flashing on the main menu.

For example. Vacuum degree displayed on the main menu is 45Pa (Pic‐10) and pressure set for Pre‐vacuum is 30Pa(Pic‐11).

Pic‐10

Pic‐11

There are 2 reasons:

☞

Reason 1:There is minor leakage.

Solution:

Step 1. Do NOT stop the freeze dryer.

Step 2. Check and make sure the door is closed tightly, and there is no leakage with all the vacuum tubes outside/inside

the freeze dryer and connectors.

Step 3. Go to Main Menu, Press "FORMULA". Modify "Pre‐Vacuum Pressure from 30(Pa) into a value (e.g. 60Pa) higher

than vacuum degree (e.g. 45Pa) as displayed on the main menu

*This is because pre‐freeze stage has completed before re‐start and it needs to skip this stage after re‐start. So the

pre‐freeze stage can run only for 1 minute then go to vacuum pumping stage quickly.

Step 4.Go to Main Menu, press "OPERATION". On OPERATION menu, press "Stop Vacu. Alarm" to eliminate vacuum alarm.

Then the freeze dryer can continue to run in good condition without vacuum alarm.

The Problem is solved.