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FN1AAF: Operation and Maintenance Manual
Filter Replacement
NOTE: Before replacing filters, check to make sure there is nothing
impeding the airflow into the unit. Check under the unit for paper,
rubbish, etc., that may be trapped on the intake side.
CAUTION
!
PERSONAL PROTECTION
Consider the filters contaminated. Wear appropriate Personal Protective
Equipment (gown, gloves, respirator, etc) when changing filters, and
seal them in plastic bags for disposal. Refer to ASHRAE "Guidance for
Building
Operations
During
https://www.ashrae.org/news/ashraejournal/guidance-for-building-oper
ations-during-the-covid-19-pandemic
WARNING
!
MOVING PARTS & SHARP EDGES HAZARD
Failure to follow this warning could result in personal injury.
Do not place objects on top of the discharge plenum.
Keep hands and face away.
Rotating blower wheel can cause serious injury.
Wear gloves when handling.
NOTE: If your facility already has a procedure in place for replacing
filters, follow your procedure. If guidance is needed then follow these
instructions.
Pre-Filter
The pre-filter should generally be replaced every 60 to 90 days.
When the red indicator light on the front panel is illuminated, the most
likely reason is that the pre-filter is clogged and needs to be replaced.
Proceed as follows
(Fig.
5):
1. Rock the green the power switch down to the OFF position.
2. Unplug the unit from the wall outlet.
3. Listen to make sure the blower wheel has stopped spinning, and
remove the bottom front door.
4. Put on Personal Protective Equipment.
5. Slide the pre-filter out of the cabinet and immediately put it inside
an approved containment bag. Dispose per facility guidelines for
hazardous materials.
6. Replace the pre-filter with the same type and size (minimum
MERV 7). Note the air-flow arrows on the filter and make sure they
point up.
7. Replace the bottom front door.
8. Plug in the unit and rock the power switch up to the ON position.
The red indicator light should extinguish within a few seconds. If it does
not, then the HEPA filter needs to be replaced.
HEPA Filter
The HEPA filter, when used in a negative air machine, is rated for
approximately 40,000 hours of operation, or 4 years, under normal
conditions and recommended replacement of the pre-filter (air scrubber
use will reduce filter life). If the red indicator light is illuminated, and
did not extinguish after replacing the pre-filter, then the next step is to
replace the main HEPA filter. Do these steps
1. Move the power switch to the OFF position.
2. Unplug the unit from the wall outlet.
3. Listen to make sure the blower wheel has stopped spinning, and
remove the bottom front door.
4. Put on Personal Protective Equipment.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
the
COVID-19
Pandemic"
(Fig.
5):
5. Remove the pre-filter from the unit.
6. Use a 1/2-inch open-end or adjustable wrench to remove the bottom
nuts from the all-thread bars on both sides (four nuts total).
7. Slide the bottom HEPA filter supports down, along with the filter,
and out of the unit.
8. Remove the HEPA filter and immediately put it inside an approved
containment bag. Dispose per facility guidelines for hazardous
materials.
9. Position the new HEPA filter into the unit with the gasket on the
filter facing up, on the discharge side of the filter. Make sure the
HEPA filter is centered and the edges align with the brackets on the
top side and each side for a complete seal.
—
10. Re-install the bottom supports and attach the bottom nuts.
11. Tighten the nuts equally until the filter is held securely in place, and
ensure the top HEPA filter gasket is significantly compressed
against the mounting structure to assure no bypass air.
12. Inspect the filter for a complete and tight fit. Loosen the nuts and
reposition if necessary.
13. Replace the pre-filter.
14. Replace the bottom front door.
Airflow Adjustments
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Disconnect all electrical power to the unit before removing access
panels to perform any maintenance.
If you desire different airflows from the factory-set Low, Medium, and
High (taps 1, 3, and 5), do these steps:
1. Move the power switch to the OFF position.
2. Unplug the unit from the wall outlet.
3. Listen to make sure the blower wheel has stopped spinning, and
loosen the screws attaching the bottom door, but do not remove.
4. Remove the screws attaching the upper door and allow it to gently
swing down and rest, supported by the wire harness attached to the
front panel.
3
HEPA Filter
Pre-filter
Fig. 5 – Filters
WARNING
!
A200224
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