7
MODES OF OPERATION
1.
Negative Pressure
- used to help ensure that airborne contaminants do not escape from a contained
area, by maintaining negative (lower) air pressure within that area compared to adjacent areas. This is
generally accomplished by placing the unit inside the containment area and exhausting filtered air from
the unit out of the area. The filtered air must be exhausted outside of the containment area, either
directly to the outdoors, or into another part of the building. To maintain negative pressure, the air
exhaust must exceed the air supply by the greater of: 10% or 100 CFM. To achieve this differential, the
air supply volume to the area may have to be reduced. Negative pressure levels should be continuously
monitored
2.
Recirculation
- used to reduce concentrations of airborne contaminants in a room or area by
continuously cleaning the air and exhausting it back into the same room or area.
3.
Positive Pressure
- used to help prevent airborne contaminants from entering a containment area, by
keeping that area under positive pressure compared to adjacent spaces, so any air leakage will be an
outflow of clean air, and not inflow of contaminated air. This pressure differential can be established by
placing the unit outside of containment area and using it to push HEPA-filtered air into the area through
flex duct attached between the outlet collar and a location inside the area. To ensure that the proper
pressure differential is maintained, the volume of HEPA-filtered air supplied to the area must be the
greater: of 10% or 100 CFM higher than the volume of air exhausted from it by the HVAC system.
Positive pressure levels should be monitored continuously.
Important Note:
Do not operate the unit unless the pre-filter and HEPA filter are installed and the filter access
panel is in place.
TO START UNIT
1.
Check to make sure that the Speed Control Switch is in the “OFF” position. Plug power cord into a 120
volt AC, 60 Hz, 15 amp supply circuit.
2.
Turn Speed Control switch clockwise past the click at the “HIGH” setting to turn power “ON”.
3.
Set Speed Control switch to desired setting.
Refer to the chart in this instruction manual entitled “AIRFLOW RATINGS” that lists the airflows for the HA700
and HA700A.
Note:
In the event of a power failure while the unit is running or loss of power due to any other cause, this
unit’s motor will restart when power is restored.
FILTER CHANGE INDICATOR
The Filter Change Indicator light illuminating (all models), a differential pressure reading of 1.6" WC or greater
on the Differential Pressure Gauge (HA700A only), and/or the Audible Alarm tone sounding (HA700A only)
indicate one or more of the following:
1. Loaded filter(s). Refer to
Filter Change Procedure
.
2. Restrictions on air intake. Refer to Troubleshooting Guide.
Note:
The Filter Change Audio Alarm can be deactivated by turning the Audio Alarm Activation Switch "OFF".
FILTER REPLACEMENT
Note:
Personnel responsible for changing filters, servicing units or relocating units within the facility are urged
to wear the proper personal protective equipment and follow safe work practices in accordance with federal,
state, provincial, and employer regulations. Abatement Technologies cannot recommend the type of PPE
required as that will need to be determined by safety/risk assessment personnel based on various risk factors,
including the type of particulates being captured by the air filtration device and the surrounding environment
where the units are being used, transported, or serviced.
Note:
Filters being replaced must be disposed of in accordance with federal, state, provincial, local and facility
regulations.
System airflow reduction is generally the result of filter loading, blockage of the unit’s inlet or use of excessive
