KRUEGER PAC Series User manual

Installation, Operation, and
Maintenance Manual
PAC SERIES
AIR CLEANERS
PAC HF/LF
WWW.KRUEGER-HVAC.COM

PAC HF/LF AIR CLEANER
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
SECTION ONE - INTRODUCTION................................. 3
Features............................................................................3
Options .............................................................................3
Applications.....................................................................3
SECTION TWO - INSTALLATION.................................. 4
Safety Warning & Procedures....................................4
Unpacking Instructions.................................................4
Assembly..........................................................................4
SECTION THREE - OPERATION ................................... 4
Initial Start-up.................................................................4
Speed Adjustment..........................................................4
Airflow Indicator.............................................................4
Recirculation Mode........................................................4
Partial Exhaust / Recirculation Mode........................5
Total Exhaust Mode (Negative Pressure) .................6
Achieving Negative Pressure ......................................6
Difficulty Achieving Negative Pressure....................6
SECTION FOUR - MAINTENANCE & SERVICE .......... 7
Parts Identification........................................................7
Cleaning the Unit............................................................7
Prefilter Replacement...................................................8
Removal of Front and Rear Panels.............................8
HEPA Filter Replacement .............................................8
Removal of the UV Light Assembly...........................8
Power Cord......................................................................9
ON/OFF Switch ...............................................................9
Speed Control Switch....................................................9
Air Pressure Switch.......................................................9
Capacitor..........................................................................9
Motor ................................................................................9
Motor/Blower Lubrication............................................9
Relocating a Contaminated Unit.................................9
Unit Decontamination ...................................................9
UV Light Tube Replacement ........................................10
SECTION FIVE - TROUBLESHOOTING ........................ 11
Inoperative Airflow ........................................................11
Low Airflow......................................................................11
High Airflow ....................................................................11
Excessive Contamination .............................................11
SECTION SIX - MISCELLANEOUS ............................... 12
Wiring Diagram ..............................................................12
Specifications .................................................................12
Replacement Parts .......................................................13
Airflow Measurement & Testing.................................14
SECTION SEVEN - APPENDIX...................................... 14
SECTION EIGHT - LIMITED WARRANTY ................... 15
TABLE OF CONTENTS

3
PAC HF/LF AIR CLEANER
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
FEATURES
• Low Cost Isolation Room: The PAC HF/LF with UV is an
easy and economical solution for creating a negative
pressure, isolation room. Simply roll the PAC HF/LF with
UV into a standard room, connect flexible ducting to
the 6” (152 mm) collar on the top of the unit for partial
exhaust or to the optional 8” (204 mm) flanged collar for
total exhaust and vent the purified air to the exterior
through a window or wall.
• Flexible Applications: The versatile PAC HF/LF with UV
can be used as a clean air recirculating unit, a negative
pressure unit or as a split system to create both negative
pressure and clean air recirculation by simultaneously
exhausting some of the air out while recirculating the
remainder back into the room.
• Small and Portable: The PAC HF/LF with UV can be rolled
from one room to another and easily fits into areas with
limited floor space.
• Simple Maintenance: Both HEPA filter and prefilter
are easily accessible for replacement by authorized
personnel.
• 3-Speed Adjustable Airflow: With speeds ranging from
560 to 800 CFM (951 to 1360 m3/hr), the PAC HF/LF with
UV provides effective air filtration for a wide variety of
room sizes.
• Room Air Changes Per Hour: Provides up to 27 room
air changes per hour (ACH) in a typical 18 x 12 x 8 ft (5.5 x
3.7 x 2.4 m) patient room or up to 12 ACH for rooms up to
4,000 cubic feet (113 cubic meters).
• Low-High Clean Air Circulation Pattern: Room air, along
with airborne contaminants, is drawn into the intake
grille at the bottom while the purified air is discharged at
a high velocity from the exhaust grille located at the top
of the PAC HF/LF with UV to generate a sweeping, low-
to-high air circulation pattern with adequate “reach” to
optimize the clean breathing zone for patient and staff.
• Quiet Operation: 52 dBA on low, 56 dBA on medium,
and 60 dBA on high speed measured 30” (762mm) from
face of the unit.
SECTION ONE - INTRODUCTION
OPTIONS
• PAC HF/LF with ULPA filter upgrade
• 220 V, 50/60 Hz unit available
• Carbon prefilter
• 8” (203 mm) 100% exhaust collar kit
APPLICATIONS
• Negative Pressure Rooms
• Emergency Rooms
• Waiting Rooms
• Sputum Induction
• Aerosol Pentamidine Treatment
• Intensive Care Units
• Bronchoscopy Rooms
• Renal Dialysis Rooms
• Clinics
• Physician Offices
• Correctional Facilities
• Nursing Homes
• Homeless Shelters
• Addiction Recovery Center
Krueger’s PAC HF/LF UV is a portable, self-contained high efficiency particulate air (HEPA) filtration system with an ultraviolet
lamp that helps to disinfect the filter face. The PAC HF/LF with UV is designed to easily and economically create a negative
pressure isolation room that will meet OSHA and CDC TB guidelines. The PAC HF/LF with UV can be used as a positive
pressure clean air recirculating system in clinics, waiting rooms, hospital emergency rooms and other confined areas or as a
partial or complete exhausting system to create a negative pressure isolation room for possible use with patients known or
suspected of having TB, SARS, or other infectious diseases. As a recirculating unit, the PAC HF/LF with UV powerful motor/
blower can deliver up to 800 cubic feet per minute (CFM) or 1360 m3/hr to provide a large number of room air changes per
hour to minimize the spread of airborne diseases to patients and health care workers. As a negative pressure unit, the air
passing through the HEPA filter is cleansed of 99.99% of particles as small as 0.3 micron and may be exhausted directly to
the exterior through a window, or through a wall, simply by connecting flexible ducting to the 6” (152 mm) collar located on
the top of the PAC HF/LF with UV. The PAC HF/LF with UV filter contains 220 square feet (20.4 square meters) of media to
extend its usable lifetime before filter loading occurs, resulting in decreased cost and fewer filter changes.

4
PAC HF/LF AIR CLEANER
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
SECTION TWO - INSTALLATION
INITIAL START-UP
1. Connect the power cord to a standard 115 V, 1-phase,
60 Hz, or 220 V, 50 Hz, grounded power source. Assure
that the circuit is sized to provide sufficient amperage as
noted on the data plate.
2. Locate the “ON/OFF” switch on the right side of the unit.
The switch is a maintain contact rocker type.
3. Turn the PAC HF/LF unit on by pressing downward on
the raised portion of the rocker switch. A light whirring
sound will be heard as the motor starts. Within 5 to 10
seconds, the module will start to provide clean air into
the environment.
SPEED ADJUSTMENT
NOTE: The PAC HF/LF unit is set on low at the factory.
1. To change speeds, remove the exhaust grille by pulling
down and lifting out.
2. Turn the 3-speed switch to the desired setting.
3. Replace the exhaust grille.
AIRFLOW INDICATOR
1. Locate the airflow indicator on the right side of the unit
above the “ON/OFF” switch. On high speed, the light will
turn on when there is insufficient pressure, indicating
the need for a filter change. The airflow indicator should
not be used as the only guide for when a filter change
is necessary. The unit should be checked at each use
to insure recommended room air changes per hour are
being met.
2. The air velocity generated by the unit may be checked
using an airflow measurement device. The volume of air
entering the lower intake grille should be approximately
560 CFM (951 m3/h) on low, 690 CFM (1172 m3/h) on
medium and 800 CFM (1359 m3/h) on high with a new
filter.
RECIRCULATION MODE
1. The PAC HF/LF unit is set at the factory on the 100% air
recirculation mode.
2. The room air change rate of the unit will depend on both
the speed setting and the size of the room. See table in
the Appendix on page 14 for representative room air
changes per hour (ACH).
3. For maximum recirculation efficiency, the unit should be
placed between the entry door and the patient’s bed or
the activity area (see Figure 1 on next page). However,
the unit will function effectively at other locations within
the room.
SAFETY WARNING & PROCEDURES
WARNING: To reduce the risk of fire, electrical
shock, or injury to persons, observe the following.
1. Installation work and electrical wiring must be done by
a qualified person(s) in accordance with all applicable
codes and standards, including fire-rated construction.
2. When cutting or drilling into a wall or ceiling, do not
damage electrical wiring or other hidden utilities.
3. Service to and decontamination of this equipment should
be performed by an authorized technician trained and
experienced in performance evaluation and maintenance
of clean air equipment. However, certain procedures are
outlined in this manual that can be performed by the
owner.
4. Before servicing the unit, switch power off at service
panel and lock service panel to prevent power from being
switched on accidentally, and follow proper procedures
as necessary.
5. Use this unit only in the manner intended by the
manufacturer.
UNPACKING INSTRUCTIONS
1. The PAC HF/LF is shipped in an open-framed crate. The
module should be inspected for exterior shipping damage
immediately upon arrival. If any damage is observed, a
claims report should be completed and promptly filed
with the responsible carrier.
2. Uncrate and remove all packing material. Examine the
unit for internal damage. If damage is discovered inside
the crating, file a claim with the responsible carrier
immediately. The shipping components list and actual
material received should be compared and any shortages
reported to Krueger immediately.
ASSEMBLY
1. The PAC HF/LF is shipped completely assembled from the
factory and requires no assembly. Every unit is tested
prior to shipment to verify airflow, noise level, and that
the unit is leak-free.
2. Place the unit in its final operating position (see Figure 1
for recommended positioning).
3. Lock the wheel locks on the casters to keep the unit from
accidental repositioning.
NOTE: The CDC requires that quantitative leakage and filter
performance tests be performed at the initial installation
and every time the filter is changed or moved. Tests should
be repeated every six months. The factory tests should not
be substituted for the initial test.
!
Warning
SECTION THREE - OPERATION

5
PAC HF/LF AIR CLEANER
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Figure 1: Recommended unit positioning within a patient room
PARTIAL EXHAUST/RECIRCULATION MODE
Note: The PAC HF/LF with or without UV units come with a removable exhaust cover plate and a removable 6” (152mm) duct
collar for attachment to exhaust ducting (not included) to create a negative pressure room. If the exhaust cover plate is not
removed, both the PAC HF/LF with or without UV units will operate in the 100% recirculation mode.
1. Remove the exhaust cover plate located on top of the unit
by taking off the four (4) screws and plastic caps used to
secure the cover to the exhaust port.
2. Remove the 6” (152mm) duct collar underneath the top
cover and flip the collar over.
3. Attach exhaust ducting (not included) onto the collar and
fasten tightly with a round hose clamp (not included).
4. Mount the duct collar with ducting onto the unit exhaust
port using the four (4) screws that originally held the
cover plate. NOTE: Keep the top plate and plastic washers
for re-assembly when needed.
5. The HEPA filtered exhaust air can now be vented to the
outside or returned to the main HVAC system. If the
unit is ducted to an exhaust duct rather than directly to
the outside, it must be verified that the exhaust duct is
capable of handling the exhaust air expelled by the unit.
6. The PAC HF/LF is designed to exhaust 100-300 CFM (170-
510 m3/h) at the 6” exhaust port. It is recommended
that the unit be set on the high-speed setting when
operating in this mode to achieve maximum exhaust and
negative pressure. At this setting, the unit will exhaust
approximately 300 CFM (510 m3/h) and recirculate 500
CFM (850 m3/h).
SECTION THREE - OPERATION (CONTINUED)
PAC UNIT
SIDE SECTION
TOP SECTION
DOOR
PAC UNIT
BED OR ACTIVITY AREA

6
PAC HF/LF AIR CLEANER
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
ACHIEVING NEGATIVE PRESSURE
1. The PAC HF/LF unit is designed to exhaust 100-300 CFM
(170-510 m3/h) when the 6” (152.4mm) exhaust collar is
used. It is recommended that the unit be set on the high-
speed setting when operating in this mode to achieve
maximum exhaust and negative pressure. At this setting,
the unit will exhaust approximately 300 CFM (510 m3/h)
and recirculate 500 CFM (850 m3/h).
2. If an exhaust volume greater than 300 CFM (510 m3/h) is
required to create a negative pressure room, the optional
8” (203.2mm) 100% exhaust collar should be used.
3. The attachment of ductwork to the exhaust port
decreases the air volume exhausted through the port.
The magnitude of the decrease varies depending on the
length and type of duct as we as its configuration. For
example, for a 10 ft (3.048m) run of standard flexible
duct containing two 90° bends, the exhaust reduction
will be approximately 100 CFM (170 m3/h).
4. CDC recommends that air from negative pressure rooms
be exhausted to the outside in accordance with federal,
state, local or country regulations. The air should not be
recirculated into the general ventilation. In certain cases
in existing facilities, recirculation of air into the general
ventilation system is unavoidable and, in such cases, CDC
guidelines state that HEPA filters should be installed in
the exhaust duct leading from the room to the general
ventilation system.
NOTE: It is the responsibility of the purchaser, and not
Krueger, to ensure the room in which the unit is used is in
compliance with CDC Guidelines* for a negative pressure
isolation room and monitored to ensure its continuing
performance.
DIFFICULTY ACHIEVING NEGATIVE PRESSURE
The equipment may not be able to achieve or maintain
negative pressure in conformance with the CDC Guidelines*
due to building ventilation of rooms or air leakage. The room
should be inspected for air leakage through doors, windows,
plumbing and wall penetrations. Appropriate corrective
action should be taken to seal the leaks.
* CDC. Guidelines for Preventing the Transmission of Tuberculosis
in Healthcare Facilities, 1994. MMWR, October 28, 1994; 43 (No.
RR-13).
SECTION THREE - OPERATION (CONTINUED)
TOTAL EXHAUST MODE (NEGATIVE PRESSURE)
NOTE: The cover plate must be securely attached to the top
of the unit to run in the 100% exhaust mode.
An optional 8” (203mm) exhaust collar with flange is available
to convert the unit to the 100% exhaust mode.
1. Remove the front exhaust grille by pulling down and
lifting out.
2. Place the optional 8” (203mm) exhaust collar over the
opening where the grille was removed and attach with
the screws included with the 8” collar.
3. Attach flexible exhaust duct (not included) over the 8”
collar and fasten tightly with a round hose clamp (not
included).
4. The HEPA filtered exhaust air can now be vented to the
outside or returned to the main HVAC system. If the
unit is ducted to an exhaust duct rather than directly to
the outside, it must be verified that the exhaust duct is
capable of handling the exhaust air expelled by the unit.
Note: CDC guidelines recommend that rooms used for
negative pressure isolation should be single patient rooms
with negative pressure relative to the corridor or other areas
connected to the room. The minimum pressure difference
necessary to achieve and maintain negative pressure that
will result in airflow into the room is 0.01 Inch w.G. (2.5pa)
(a higher pressure is preferred). To achieve this, the exhaust
flow should be 10% or 50 CFM (85 m3/h) greater than the
supply (whichever is greater).

7
PAC HF/LF AIR CLEANER
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
PARTS IDENTIFICATION
Figure 2: Parts location
CLEANING THE UNIT
1. Periodic cleaning of the unit may be done with a mild
disinfecting soap and water solution. A 1% or 1/100
dilution of bleach is an optional disinfectant.**
2. Exterior cabinet cleaning must be performed with the
unit running. Wipe the exterior of the unit with a damp
sponge or cloth, paying particular attention to the
prefilter intake grille.
**Rutala WA, APlC Guideline for Selection and Use of Disinfectants,
Am J lnfect Control 1996 Aug ; 24(4): 313-42.
Caution: Proper protective equipment and measures must
be used at all times during unit cleaning and maintenance.
Check with your safety oce to assure the cleaning
solutions, protective equipment (disposable hospital gown,
HEPA respirator, protective gloves) and protocols followed
comply with your facility’s and CDC Guidelines.
Caution: Disconnect the unit from the electrical power
source before attempting service. Do not work inside
the PAC HF/LF with UV unit with the UV light on. Proper
replacement of UV containment baes, after maintenance,
is mandatory to maintain safe, short-term and long-term UV
exposure levels.
SECTION FOUR - MAINTENANCE & SERVICE
UV CONTAINMENT BAFFLE (LEFT HAND)*
UV LIGHT ASSEMBLY*
MOTOR/BLOWER ASSEMBLY
(REMOVED FROM BACK)
DUCT COVER
(6” DUCT COLLAR UNDERNEATH)
BACK PANEL
EXHAUST GRILLE
(REMOVE FOR ACCESS TO 3-SPEED SWITCH)
POWER CORD
ON/OFF SWITCH
FILTER CHANGE INDICATOR
UV LAMP MOUNTING CHANNEL*
HEPA FILTER
CLAMP AND BOLT
UV CONTAINMENT BAFFLE (RIGHT HAND)*
FRONT PANEL
INTAKE GRILLE(PREFILTER INSIDE)
NOTE: *Applies to UV units only.
THUMB NUTS

8
PAC HF/LF AIR CLEANER
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
PREFILTER REPLACEMENT
1. The prefilter should be replaced every 60 to 90 days.
Regularly replacing the prefilter will maximize the
life of the HEPA filter. The PAC HF/LF with UV comes
standard with an anti-microbial pleated prefilter. It is
recommended that a pleated prefilter is used.
2. Wipe the unit as described previously.
The following steps must be performed with the unit
(fan) running:
3. Spray a mist of phenolic disinfectant such as “Amply“ or
“Lysol” into the air intake grille.
4. Remove the two (2) thumb nuts from the face of the
intake grille and pull the grille out.
5. Insert gloved hand into a red plastic, medical waste
disposal bag. Grasp the top portion of the prefilter with
bagged hand and gently pull outward. The airflow of the
unit will offer a resistance to pulling the prefilter out.
6. Turn the bag inside out over the prefilter then seal the
bag for containment.
7. Install a new prefilter and secure the grille by following
step these instructions in reverse order of removal.
Caution: Appropriate decontamination procedures
must be followed prior to removal of the access panels to
replace the HEPA filter or other parts. Contact your safety
office to assure it conforms to your facility’s protocol.
REMOVAL OF FRONT AND REAR PANELS
1. Remove the front access panel by taking off the screw
covers and removing the four (4) screws. The front panel
may now be lifted off.
2. Remove the 18 screws securing the rear access panel.
The rear panel may now be lifted off.
HEPA FILTER REPLACEMENT
The CDC recommends that in any application, HEPA filters
should be maintained meticulously and should be carefully
installed by adequately trained personnel wearing an
appropriate respirator. A regular maintenance program
should include procedures for installation, removal and
disposal of filter elements and a program to monitor the
HEPA filter for possible leakage and for filter loading.
1. The expected HEPA filter life should range from 18
months to two (2) years depending on the environment
and prefilter maintenance schedule. The filter indicator
light will give a warning of filter loading by flickering on
high speed. When the light stays on at high speed, the
HEPA filter should be changed.
2. Remove the prefilter.
3. Remove the front access panel. Lift the panel out and set
it aside.
REMOVAL OF THE UV LIGHT ASSEMBLY
1. Remove the five (5) screws on the left hand UV
containment baffle and the five (5) screws on the
right hand containment baffle and remove the baffle
assemblies.
2. Disconnect the 3-pin connector located near the UV
lamp ballast and remove the wires from the wire routing
clamp.
3. Remove the four (4) screws, washers and nuts holding
the UV lamp assembly in place (the mounting channel
may be removed or left in place). Access through the
exhaust grille is necessary to remove the mounting
channel. Remove the exhaust grille by pushing down
and lifting out. Carefully remove the UV lamp assembly
taking care not to touch the glass tube. NOTE: Clean the
UV light tube as necessary, using a cloth dampened with
an 10% alcohol (or ammonia) and water solution, to avoid
lamp degradation due to oil and dust residues. Gloves
are required when handling UV Light.
4. Remove the six (6) bolts and clamps holding the HEPA
filter. Slip a plastic biohazard bag over the filter from the
top down. Tilt the top of the filter outward and wrap the
bag over the bottom of the HEPA filter. Seal the bag to for
containment. NOTE: It may be necessary to use two (2)
biohazard bags to fully contain the filter.
5. Remove the new HEPA filter from its container and install
it in the reverse order of removal. Care must be taken
when handling the HEPA filter. Do not bump or squeeze
the filter as this may damage the filter and render it non-
effective.
SECTION FOUR - MAINTENANCE & SERVICE (CONTINUED)

9
PAC HF/LF AIR CLEANER
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
POWER CORD
1. With the back panel removed, unplug the white connector
on the power cord.
2. Remove nut on ground wire.
3. Remove strain relief on the side of the unit.
4. Remove the old cord and replace with the new one,
following the steps above in reverse order.
ON/OFF SWITCH
1. With the back panel removed, unplug the white connector
on the switch and squeeze the retainer strips on switch
bezel.
2. Remove retaining nut that holds the switch to the baffle
panel.
3. Unplug a connecting wires and replace the new switch,
following the steps above in reverse order.
SPEED CONTROL SWITCH
1. Remove the exhaust grille by pushing down and lifting
out.
2. Remove the retaining nut that holds the switch to the
baffle panel.
3. Unplug a connecting wires and replace with the new
switch, following the steps above in reverse order.
CAPACITOR
1. With the back panel removed, remove one screw from
capacitor strap.
2. Slide capacitor out.
3. Remove the rubber boot and disconnect wires.
4. Replace with the new capacitor, following the steps above
in reverse order.
AIR PRESSURE SWITCH
1. With the back panel removed, disconnect the two (2) air
supply tubes and two (2) electric terminals.
2. Remove the two (2) sheet metal screws and replace with
the new switch, making sure to reconnect everything
correctly by reversing operation of removal.
FILTER CHANGE INDICATOR LIGHT
1. With the back panel removed, unplug the two (2) wires
and push out the filter indicator light from the inside of
the unit.
2. Replace the filter indicator light by following the step
above in reverse order.
MOTOR/BLOWER LUBRICATION
The PAC HF/LF unit is equipped with permanently sealed
bearings and requires no lubrication.
MOTOR ASSEMBLY REMOVAL
1. With the back panel removed, disconnect all wire
connections between the motor and other components.
2. Loosen the Allen Head set screws on the blower wheel
hub and remove the wheel.
3. Loosen the screw on the motor belly band until the motor
can slide out.
4. Replace with the new motor, following the steps above in
reverse order, ensuring there is an ¼-inch gap between
the blower wheel and the inlet ring.
Caution: When reinstalling the motor ensure that it does
not touch or puncture the HEPA lter.
RELOCATING A CONTAMINATED UNIT
NOTE: Use proper protocol, gowning, and protective
measures.
1. If an existing unit is to be placed into storage for an
extended period of time, remove and replace the prefilter.
2. Turn the unit off and disconnect from power source.
3. Clean the exterior surfaces of the unit.
4. Unlock caster wheel locks and move unit to its new
location.
UNIT DECONTAMINATION
NOTE: Use proper protocol, gowning, and protective
measures during unit decontamination.
Should decontamination of the unit be required, the following
(on the next page) is an adaptation by Annex G. of the
Recommended Microbiological Decontamination Procedure
from NSF 49, June 2008. Confirm with appropriate Biosafety
and Industrial Safety Professionals that the procedures
meet your facility’s guidelines.
SECTION FOUR - MAINTENANCE & SERVICE (CONTINUED)

10
PAC HF/LF AIR CLEANER
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
SECTION FOUR - MAINTENANCE & SERVICE (CONTINUED)
Paraformaldehyde Decontamination
1. As described previously, relocate the unit to a controlled
access, non-public area with a non-porous floor, good
ventilation, and a dedicated exhaust directly outside the
building. A new prefilter is not required. Attach and seal
a flexible hose to the dedicated exhaust. Place the other
end of the exhaust hose near the unit.
2. Calculate the total volume of the unit by multiplying the
height, width, and depth. The total unit volume is 13 cubic
feet (61” x 24” x 15.5”) or (1.55m x 0.61m x 0.39m).
3. Multiply the total volume of the unit by 0.3g/ft3to
determine the gram weight of Paraformaldehyde
required. Decontamination of the unit requires 3.9 grams
(12 ft3 x 0.3g/ ft3) of Paraformaldehyde.
4. Remove the intake grille and wipe it down with an
appropriate surface decontaminant.
5. Place an unplugged heating device, such as a commercially
available electric frying pan with the thermostat set
at 232.2° to 246.1°C (450° to 475°F) inside the unit
through the removed prefilter access panel. Spread
the Paraformaldehyde evenly over the heating surface
of the electric frying pan. Caution: The auto-ignition
temperature of paraformaldehyde is 300°C (572°F).
Place a hot plate, beaker of water, and temperature and
humidity indicators in the unit next to the pan that will
contain the paraformaldehyde.
6. Enclose all sides of the unit with heavy gauge plastic film
and tape in place while leaving the film that will close the
space formerly occupied by the intake grille free. The
power cord should be coiled and taped to the unit and
sealed under the plastic film. Seal the film to the floor on
which the unit stands.
7. Determine the temperature and humidity inside the unit.
8. The temperature should be 21.1°C (70°F) or higher with a
humidity level between 60% to 85%. Use the hot plate to
heat the beaker of water until the desired temperature
and humidity are achieved. Disconnect the hot plate.
9. Seal the film over the remaining opening of the intake grille
space. Carefully seal around the power cord extending
from the electric frying pan so that formaldehyde gas will
not leak out.
10. Plug the cord of the electric frying pan into an outlet.
11. After the Paraformaldehyde has depolymerized,
disconnect the frying pan from the electrical outlet.
12. Allow the unit to stand for a minimum of two hours or
overnight.
13. Attach the flexible hose to the unit and allow it to draw
from inside the unit.
14. After 15 minutes of visible exhaust activity, small openings
may be made in the film over the unit’s air supply grille to
improve ventilation.
15. Allow the unit to ventilate overnight.
16. Remove the unit from exhaust ventilation when the
formaldehyde gas has been exhausted. Caution: During
unit decontamination, respiratory protection for service
personnel is highly recommended. Only national institute
for occupational safety and health (NIOSH) approved
respirators should be used.
17. Remove the HEPA filter as described previously. The filter
can now be disposed of as general waste.
Phenolic Decontamination
In facilities where Paraformaldehyde gas decontamination is
prohibited or not feasible, the unit can be disinfected by the
following procedure.
1. Remove the prefilter.
2. After the intake grille and prefilter are removed, turn
the unit on, and with the unit running, spray a mist of
phenolic disinfectant such as Amphyl or Lysol into the air
intake opening. Approximately two (2) to five (5) ounces
is adequate.
3. Remove the HEPA filter as described previously. Since the
filter has not been decontaminated by the formaldehyde
procedure, it must be placed in a red medical waste bag
and disposed of properly.
UV LIGHT TUBE REPLACEMENT
1. The expected life of the UV light tube is nine (9) months to
one (1) year, depending on the environment and prefilter
maintenance schedule.
2. Remove the five (5) screws on the left hand UV
containment baffle or the five (5) screws on the right hand
containment baffle and remove the baffle assembly.
3. Reach around the UV light assembly, taking care not to
touch the face of the HEPA filter, and grasp the “old” light
tube gently. Rotate the light tube 90° in either direction
to enable removal (you should feel tension on the tube
release). To remove the light tube, carefully pull away
from the UV lamp assembly, towards the HEPA filter.
Dispose of the light tube (or recycle) following local
guidelines. Caution: Touching the face of the filter could
cause damage to the filter media resulting in the need of
professional repair or replacement.
4. Use clean latex gloves to ensure that the new light tube
remains clean. Clean the new light tube using a cloth
dampened with a 10% alcohol (or ammonia) and water
solution. To replace, reverse the order of removal.