It is important to closely monitor the differential pressure gauge, 0”-5” WC on each of the HEPA filter cabinets
to not exceed the safe operating DP of 4” WC. Operating at a higher differential pressure could reduce the
required efficiency of the HEPA filters and release contaminants downstream. (See Replacement of Filters
below). Our powerful blowers are capable of producing up to 9” WC negative pressure when the HEPA filters
are fully loaded with dust.
To Start the Machine
With flex hoses connected, move the HEPA cabinets to desired positions and block the wheels. The hoses should be
running straight to minimize airflow resistance.
To turn the machine on, plug the power cord into a 480VAC, 60Hz, 30Amp outlet or hard wired to a generator.
To start blower #1, place the motor starter disconnect switch handle in the ON position and then push the START
pushbutton. Let the blower run for about 10 seconds. Then turn ON blower #2. Check the DP indicator on each of the
filter cabinets. When filters are clean, the DP gauge will read about 2.1” WC. As the filters fill with dust the efficiency of
the filters is maintained, but the air flow will decrease, and the vacuum reading will increase. Change the primary/
secondary filter frequently to protect the HEPA and to get more air flow. The HEPA filter must be replaced before the DP
gauge reaches 4.0” WC.
Check the vacuum reading on all HEPA cabinets. Note the vacuum reading while all filters are clean. With all clean
filters, the flow should be evenly distributed, and the DP gauge should read about 1.8”-2.0” WC. The filters will gradually
load with dust and the gauge reading will increase. Loading may not be evenly distributed as some HEPA cabinets
may be in an area with more dust.
DO NOT OPERATE THE HEPA CABINETS ABOVE 4.0” WC.
NOTE:
• Primary filters can be changed while the machine is running.
• The OA18000 can run with a single blower but all (3) HEPA cabinets must be connected to the blower cabinet.
• As the filters fill with dust, the efficiency of the filters are maintained, but the air flow will decrease and the vacuum
reading will increase.
• Change the primary filters frequently to protect the HEPA and to get more air flow. When the vacuum reaches about
3.5” WC with a clean prefilter, the HEPA filter will have to be replaced to increase the air flow.
To turn OFF the machine
Push the STOP pushbutton for each blower. Then turn the motor starter disconnect switch handle to the OFF position
to prevent unauthorized operation of the equipment. The disconnect switch handle can be padlocked. Please see the
manual for motor switch disconnect switch handle instructions.
WARNING
The HEPA filters and the cabinets are designed to operate at maximum of 4.5” WC of vacuum. When filters get fully
loaded with dust, the blowers are capable of generating 9” WC of vacuum and may destroy the HEPA, and potentially
the integrity of the HEPA cabinets. The vacuum reading on individual HEPA cabinets must be monitored and not to
exceed 4.0” WC.
Troubleshooting
Your Omnitec Design machine is designed and engineered to provide years of trouble-free service. Occasionally
problems occur. Here are some helpful tips and solutions to common issues.
Unit does not start
Check that the unit is plugged in and there is 480VAC available and verify power is available. Check that the motor
starter disconnect switch handle is in the ON position, then push START on the pushbutton. Test one blower at a time
