Thermo Forma 1284 Operating instructions

Models:
1284, 1285, 1286, 1287,
1288, 1290 and 1291
Biological Safety Cabinets
Class II, Type A/B3
Operating and Maintenance Manual
Manual No: 7001284 Rev. 3

Model 1280/1290 Series ___________________________________________________________________________
i
Read This Instruction Manual.
Failure to read, understand and follow the instructions in
this manual may result in damage to the unit, injury to operat-
ing personnel, and poor equipment performance.
CAUTION! All internal adjustments and maintenance must
be performed by qualified service personnel.
Refer to the serial tag on the back of this manual.
The material in this manual is for information purposes
only. The contents and the product it describes are subject to
change without notice. Thermo Forma makes no representations
or warranties with respect to this manual. In no event shall
Thermo Forma be held liable for any damages, direct or inciden-
tal, arising out of or related to the use of this manual.
MANUAL NUMBER 7001284
3 17913/HD-1237 12/7/98 Added info on leveling feet to prevent vibration - B. Morrison ccp
-- 17626/SI-7133 8/21/98 Added filter replacement information heg
-- 16449/SI-6557 8/21/98 Replaced 360155 with 360146 heg
-- 17523/HD-1207 8/21/98 Added GFI outlet as standard heg
-- HD-1188 7/7/98 Filter updates to parts list heg
-- -- 6/24/98 Revised pages 8-3 and 8-4 (airflow) per R. Meadows/NSF heg
-- HD-1179 4/14/98 Revised electrical schematics heg
2 -- 3/18/98 Added models 1286, 1287, 1290 & 1291 deg
-- -- 1/26/98 revised parts list per R. Wager heg
1 HD-1159 1/21/98 revised C50 to CWX lamps heg
0 -- 9/3/97 New manual heg
REV ECR/ECN DATE DESCRIPTION By
Lamps, thermometers and thermoregulators
contain mercury. Do not put in trash! Recycle or
dispose as hazardous waste.

Model 1280/1290 Series ___________________________________________________________________________Safety
ii
Alerts the user to important operating and/or maintenance instructions. May be used alone or with other safety sym-
bols. Read the accompanying text carefully.
Potential electrical hazards. Only qualified persons should perform the instructions and procedures associated with
this symbol.
Hazard. Do not touch. Instructions associated with this symbol should only be carried out when using special hand-
ing equipment or when wearing special, protective clothing.
Potential biological hazards. Proper protective equipment and procedures must be used when following instructions
associated with this symbol. Reference O.S.H.A. Regulation 1910-1030.
Potentially hazardous energy. Equipment being maintained or serviced must be turned off and locked off to prevent
possible injury. Reference O.S.H.A. Regulation 1910-147.
Hot surface(s) present which may cause burns to unprotected skin or to materials which may be damaged by elevated
temperatures
Warning. Skin damage and/or eye injury can result from the light produced by ultra violet light sources installed in
this equipment. Never work in this unit with the ultra violet light operating.
* Always use the proper protective equipment (clothing, gloves, goggles etc.).
* Always dissipate extreme cold or heat, or wear protective clothing.
* Always follow good hygiene practices.
* Each individual is responsible for his/her own safety.

Model 1280/1290 Series ___________________________________________________________________________Service
iii

Model 1280/1290 Series ____________________________________________________________________Table of Contents
iv
Table of Contents
Section 1 - Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1
1.1 Unpacking List . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1
Section 2 - Introduction . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1
2.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1
2.2 Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1
Section 3 - Installation . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 1
3.1 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 1
3.2 Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 1
3.3 Plumbing Connection . . . . . . . . . . . . . . . . . . . . . . . .3 - 1
3.4 Exhaust Requirements . . . . . . . . . . . . . . . . . . . . . . .3 - 1
a. Direct Room Exhaust . . . . . . . . . . . . . . . . . . . . . .3 - 1
b. External Exhaust System . . . . . . . . . . . . . . . . . . . .3 - 1
3.5 Remote Alarm Contacts . . . . . . . . . . . . . . . . . . . . . . .3 - 4
Section 4 – Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 1
4.1 Control and Indicating Devices . . . . . . . . . . . . . . . . .4 - 1
Section 5 - General Cautions . . . . . . . . . . . . . . . . . . . . . .6 - 1
5.1 Caution Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 - 1
Section 6 - Cabinet Start-Up . . . . . . . . . . . . . . . . . . . . . .6 - 1
6.1 General Recommendations . . . . . . . . . . . . . . . . . . . .6 - 1
6.2 Use of Auxiliary Equipment in the Cabinet . . . . . . .6 - 1
6.3 Cabinet Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . .6 - 1
6.4 Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . .6 - 1
Section 7 - Troubleshooting . . . . . . . . . . . . . . . . . . . . . . .8 - 1
7.1 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . .8 - 1
Section 8 - Routine Maintenance . . . . . . . . . . . . . . . . . . .8 - 1
8.1 Checking the Static Pressure Gauge “Zero” . . . . . . .8 - 1
8.2 Zeroing the Static Pressure Gauge . . . . . . . . . . . . . .8 - 1
8.3 Adjusting the Damper . . . . . . . . . . . . . . . . . . . . . . . .8 - 1
8.4 Biological Safety Cabinet Test Grids . . . . . . . . . . . .8 - 2
Section 9 - Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 - 1
9.1 Replacing the Blower Motor (1284 Series) . . . . . . . .9 - 1
9.2 Replacing the Blower Motor (1286 Series) . . . . . . . .9 - 2
9.3 Replacing the Filters, All Models . . . . . . . . . . . . . . .9 - 2
Section 10 – Specifications . . . . . . . . . . . . . . . . . . . . . . .10 -1
Section 11 – Accessories . . . . . . . . . . . . . . . . . . . . . . . . .11 -1
Section 12 - Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . .12 -1
Section 13 - Electrical Schematics . . . . . . . . . . . . . . . . .13 - 1
Section 14 - Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . .14 - 1
Certifier Listing

Section 1 - Receiving
1.1 Unpacking List
Included with the installation/operation manual are four
identification index buttons. These buttons may be used to iden-
tify the type of service supplied to the service valves. Also
included in a separate bag attached to the drain handle, is a
small Allen wrench used for calibrating the Static Pressure
Gauge. This Allen wrench should be kept with the manual at all
times.
Section 2 - Introduction
2.1 Description
The Models 1284, 1285, 1286, 1287, 1288, 1290 and 1291
are Class II, Type A/B3 cabinets. The “Type A/B3” designation
indicates two alternative uses of the cabinet. When vented
directly into the laboratory room, the unit serves as a “Type A”
unit. When vented to the outside atmosphere, through an in-
house exhaust system, it serves as a “Type B3” unit. Either
usage of the cabinet offers both personnel and product protec-
tion.
The cabinet can be used in low-to-moderate risk environ-
ments and is designed to NSF, International Standard #49. Class
1, 2, and 3 (low-to-moderate risk) agents are described in the
“Biosafety In Microbiological And Biomedical Laboratories”;
CDC NIH Publication No. (NIH) 88-8395, 3rd Edition, May
1993.
The cabinet’s window permits the user to place auxiliary
equipment and research implements in the work area. The work
opening must be held to 10 inches during all work procedures.
If the window is raised higher than the designated 10 inches,
the air barrier at the front of the cabinet will be weakened and
containment will be seriously impaired.
2.2 Theory of Operation
Clean, filtered air descends through the work zone with
approximately 40% being discharged through the exhaust
HEPA filter with the remaining air recirculating through the
supply HEPA filter into the work area. Exhausted air is replaced
by room air entering the system through the front access open-
ing.
Room air entering the work zone, through the front access
opening, completes the air barrier at the unit face and is respon-
sible for the containment properties of the unit. All work must
be performed beyond the intake grille, on the solid work tray.
Model 1280/1290 Series _______________________________________________________________________Introduction
2 - 1

3 - 1
Section 3 - Installation
3.1 Location
Locate the cabinet on a firm, level surface in an area of
minimum temperature changes. The cabinet should be placed
away from disruptive air currents caused by excessive person-
nel traffic, air-conditioning or heating ductwork, or laboratory
windows and doors. Proper cabinet location is important, as
drafts disrupt critical airflow characteristics and allow room
contaminants to enter or escape the cabinet work area.
Where space permits, fourteen inches should be allowed on
each side of the cabinet for maintenance. A twelve-inch height
should be available from the top of the cabinet to the ceiling.
Place a bubble-type level on the work surface. Adjust the
leveling feet until the cabinet is level and the most comfortable
working height is achieved. Ensure that all four leveling feet
are fully flush against the floor to prevent vibration.
3.2 Power Connection
The electrical wall outlet leading to the cabinet should be
accessible for electrical testing. This cabinet is equipped with
one power cord supplying power to the blower, lights and
receptacles. The cord should be plugged into a dedicated cir-
cuit. Refer to Section 9 or to the serial plate on the front of the
unit for electrical specifications.
3.3 Plumbing Connection
Two service valves are standard with each cabinet and
located on the right and left side of the work station. All service
valves are piped within the cabinet. External connection is a
3/8” FPT coupling. Identification index buttons are supplied.
The cabinet will accommodate four service valves. An
additional two service valves may be purchased from Thermo
Forma.
Explosive/flammable substances should never be
used in the cabinet, unless approved and moni-
tored by a biological safety officer or other quali-
fied individual. However, if flammable gas is
used, emergency shut-off valves must be located
in an accessible area external to the cabinet.
3.4 Exhaust Requirements
Filtered air from the cabinet may be exhausted directly into
the room or vented to the outside through an external exhaust
system. Consult a biological safety officer or other qualified
individual for cabinet-type exhaust requirements.
a. Direct Room Exhaust
1. Locate the exhaust filter guard on the top of the cabinet.
2. Remove and save the ten acorn-type nuts and washers
that secure the exhaust the exhaust filter guard.
3. Remove the cardboard cover plate from the top of the
cabinet.
4. Replace the exhaust filter guard with the slope toward
the front and the back of the unit. Secure it with the ten
acorn-type nuts and washers removed earlier.
b. External Exhaust System (For Class II Type B3
Only)
The intermediate connection of the cabinet to any external
exhaust system (in-house) can be done by using an exhaust
transition, which is available from Thermo Forma. The exhaust
transistion requires a minimum of 17-1/8” headroom from the
top of the cabinet.
The exhaust system should have safeguards
against exhaust failure. It is required that a bio-
logical safety officer, industrial hygienist or other
qualified individual review the agents and chemi-
cals used inside the cabinet to determine if addi-
tional filtration treatment is necessary before vent-
ing to the atmosphere.
The exhaust system must be capable of handling the vol-
ume of air passing through the cabinet. Models 1284, 1285 and
1288 have an air volume of 356-390 CFM. Models 1286, 1287,
1290 and 1291 have an air volume of 530-581 CFM.
Model 1280/1290 Series _________________________________________________________________________Installation

Model 1280/1290 Series ________________________________________________________________________Installation
3 - 2

3.5 Remote Alarm Contacts (Models 1288, 1290 and
1291)
This area contains hazardous voltages. The proce-
dure should be done by qualified personnel only.
For facilities requiring remote alarms connected to biologi-
cal safety cabinets, a relay with normally open and normally
closed contacts is installed in the blower electrical circuit. The
alarm contacts are pre-wired as shown in Figure 3-3 and on the
Model 1288, 1290 and 1291 electrical schematics at the end of
this manual. See the diagram on the following page for the
remote alarm contact relay location.
The relay wires are identified N.O., N.C., and COM and
are fitted with quick-connect terminals with the connector
mates installed. The connectors need only to be pulled apart,
the alarm wiring crimped onto the connectors and the two
halves pushed back together. The alarm wiring within the
enclosure must be 18 to 22 gauge jacketed cable, rated for a
minimum of 300V. The wires exit the control section of the
cabinet through a hole identified by the large black arrow in the
illustration below.
Refer also to the wiring diagram on the following page to
identifiy the location of the remote alarm contact relay.
Model 1280/1290 Series ________________________________________________________________________Installation
3 - 3
Figure 3-3

Section 4 – Operation
4.1 Control and Indicating Devices (Refer to Figures
4-1, 4-2, and 4-3)
Before operating the cabinet, become familiar with the fol-
lowing items:
Blower Switch- The blower switch controls power to the inter-
nal blower.
Light Switch- The “Lights” switch controls power to the fluo-
rescent lamp or the optional ultraviolet lamp. Both lamps are
located in the work area.
Ultra-Violet Light (Optional) - Recommended usage is only
when the laboratory is not in use.
Caution! Eyes or skin should not be exposed to
ultra-violet light.
On cabinets equipped with the optional ultra-violet germicidal
light, the dual purpose “Lights” switch provides the following
settings:
“Off” = center
“On” top = fluorescent lamp
“On” bottom = ultra-violet lamp
Either the fluorescent lamp or the ultra-violet lamp may be lit
at one time.
Model 1280/1290 Series _________________________________________________________________________Operation
4 - 1

Alarm By-pass Switch - The Alarm By-pass switch silences
the audible “Window Above 10 Inch” alarm for five minutes.
The red visual indicator remains illuminated. The alarm rings-
back to remind the operator that the window is still open more
than 10 inches.
Static Pressure Gauge (In. W.G.) - The static pressure gauge
measures the air pressure differential across the filters providing
an indication of filter “loading”. As the filters become loaded,
resistance increases and the reading on the static pressure gauge
increases accordingly. When the reading increases by 50% from
original measurement, cabinet airflow should be checked with a
thermoanemometer. Replace the filters if proper airflow cannot
be obtained.
The static pressure gauge should not be used as a direct
measure of airflow.
Blower Speed Control - The blower speed control is accessed
from the rear of the control panel by removing the screw on the
bottom of the control panel and swinging the control panel door
open. The blower speed is adjusted by turning the screw on the
variable resistor mounted on the circuit board adjacent to the
controller. (Refer to Figure 4-4) Turning the screw clockwise
increases air velocity; counterclockwise decreases it.
The blower speed is factory-set and should only be changed
by a qualified technician.
Model 1280/1290 Series __________________________________________________________________________Operation
4 - 2
Figure 4-3

Live voltage is present on the control terminals of
the switches and dials on the front of the blower
panel. Avoid touching these controls when reach-
ing into the control panel and making any adjust-
ments.
Measuring Blower Motor Voltage - Both blower motor volt-
age and line voltage are measured at the three terminal connec-
tors at the top of the circuit board. Refer to Figure 4-5.
Blower Motor/Lights Reset Button (15 Amp) - The Reset but-
ton (located on the left side of the control panel, directly above
the Receptacle fuses) is an in-line circuit breaker for the inter-
nal blower motor and lighting. If an overload occurs, the circuit
breaker will trip and the button will protrude from the panel.
Depress the button to reset the circuit breaker.
Note: • Turn power off to the blower.
• Turn power off to the lighting.
• Press the blower motor/lighting Reset button.
Receptacle Fuses (7 Amp - Models 1284/1285/1288,
3 Amp - Models 1286/1287/1290/1291) -
The receptacle fuses (2), located directly below the blower
motor/lights Reset button, are for the receptacles only. If an
overload occurs, the fuses will open and require replacement.
Note: • Turn the power off.
• Unplug the unit.
• Replace the fuses -
P/N 230182, 7 Amp, ¼” x 1¼”
P/N 230166, 3 Amp, ¼” x 1¼”
(Two spare fuses are located in a bracket on
the inside of the control panel.)
Duplex Receptacles - Receptacles (115 Volts) are located on
the left and right sidewall of the workstation. Power is con-
trolled by the receptacle switch located on the control panel.
The maximum load is 5 amps total for Models 1284, 1285 and
1288. Models 1286, 1287, 1290 and 1291 have a maximum
load of 2 amps total. Models 1285 and 1287 are equipped with
2 single European 230V receptacles.
Drain Valve - The drain valve, located on the right front side of
the cabinet, is provided for the safe drainage of the drain pan.
This valve must remain closed while work is being performed
in the cabinet and be used only in the event of a major spill.
If a spill occurs, immediately consult a biological
safety officer or other qualified individual for
proper procedures. To contain a spill, connect a
sealed hose from the drain valve to a sealed con-
tainer.
Service Valves - Two service valves are standard with each
cabinet. These valves are located on the right and left side of
the workstation and can be coded with the type of service that
they supply. Identification index buttons are supplied.
The cabinet supports four service valves. Additional valves may
be purchased from Thermo Forma.
Exhaust Filter Guard - The exhaust filter guard, located on
top of the exhaust filter, protects the exhaust airflow and pre-
vents the storage of objects on top of the housing.
Sliding Window Assembly - The sliding window assembly
allows the operator to raise the glass window to place items
within the work area. If the sliding window is above the 10-
inch level, a red light and audible alarm warns that an unsafe
condition exists.
When work is being performed in the cabinet, the
sliding window must be at the 10-inch position to
avoid contamination to product and personnel.
Model 1280/1290 Series __________________________________________________________________________Operation
4 - 3
Figure 4-4
Figure 4-5

Model 1280/1290 Series ____________________________________________________________________Cabinet Start-Up
Section 5 - General Cautions
5.1 Caution Notes
• Following initial installation, the unit must be thoroughly
tested and certified.
• All activities to be performed within the cabinet should be
approved by a biological safety officer or other qualified
individual.
• Since the HEPA filters remove particulates only (not gas),
explosive/flammable substances should never be used in
the cabinet, unless approved and monitored by a biological
safety officer or other qualified individual.
• Ultra-violet lighting should not be used while personnel are
using the cabinet. If exposure cannot be avoided, the prop-
er safety gear/clothing must be worn. Consult a biological
safety officer or other qualified individual for proper proce-
dures.
• If the cabinet is to be used for biological or toxicological
applications, a biological safety officer or other qualified
individual must monitor it.
• If the unit needs to be serviced, it must be decontaminated
to protect service personnel from contamination. After
servicing, the cabinet must be recertified by a qualified cer-
tifying agency.
• None of the perforations in the work area may be covered
or blocked, as airflow will be disrupted and contamination
may occur.
• Paper catches should always be kept free of debris.
Section 6 - Cabinet Start-Up
6.1 General Recommendations
• Keep movement in the room to a minimum when the cabi-
net is in use.
• Keep all laboratory doors closed to prevent drafts that may
disturb critical airflow.
• Pre-plan cabinet use and place everything needed in the
cabinet so that nothing passes through the air barrier (in or
out) during the procedure.
• Practice good aseptic technique to ensure safe use of the
cabinet.
• If a spill occurs, clean it up immediately. Decontaminate
the work area and all affected equipment.
• Do not cover or block the exhaust grille.
• Do not cover or block any perforations (air holes) in the
work area.
6.2 Use of Auxiliary Equipment in the Cabinet
Use auxiliary equipment in the cabinet only if proper pre-
cautions are taken. Appliances used in the work area will cause
turbulence, disturb the airflow and need to be carefully man-
aged. The equipment should be placed at the rear of the work-
space where it will have minimal effect.
A blender may be used in the cabinet. But because of the
amount of aerosol it produces and the turbulence it causes, it is
recommended that it be removed from the cabinet as soon as
possible.
6.3 Cabinet Checklist
1. Verify that the Drain valve is closed (the handle turned
horizontal).
2. Verify that all service valves are closed.
3. Verify that the cardboard exhaust filter protector has
been removed.
6.4 Start-Up Procedure
1. Turn the light on.
2. Check the intake and exhaust grilles to ensure they are
not blocked.
3. Turn the blower on.
4. Place everything needed into the cabinet.
5. Place the viewing window at 10 inches.
6 - 1

Model 1280/1290 Series ________________________________________________________________Routine Maintenance
8 - 1
Section 7 - Troubleshooting
7.1 Troubleshooting Guide
The following is a guide to troubleshooting the system. If a
contaminated area of the cabinet must be entered to determine
and/or resolve the source of a particular problem, the cabinet
must first be decontaminated.
Servicing of the unit must be performed by qual-
ified service personnel.
Problem 1: Airflow in the cabinet work area and through the
exhaust filter is inadequate.
Possible causes:
• Exhaust filter is blocked by laboratory materials or the pro-
tective shipping cover.
• If the biological safety cabinet is connected to an exhaust
system, there may be inadequate exhaust suction or back
pressure in the duct system. The system must be rebalanced
to handle the correct air volume. A biological safety officer
should be consulted.
• Low voltage is being applied to the blower motor.
• Blower motor or speed control is defective.
• Supply HEPA filter and Exhaust HEPA filter may be
loaded. Decontaminate the unit and replace both HEPA fil-
ters.
Before any maintenance work is performed in
the biological safety cabinet, the unit must first
be decontaminated.
Problem 2: Ultra violet light malfunction
Possible causes:
• Check lamp pins and socket ends for contact.
• Starter is defective for the UV light.
Problem 3: Fluorescent light malfunction
Possible causes:
• Check lamp pins and socket ends for contact.
• Lamp is defective.
Problem 4: Loud screeching noise
Possible causes:
• Bearings are bad in the motor blower assembly.
• Blower wheel is rubbing against the housing.
Section 8 - Routine Maintenance
8.1 Checking the Static Pressure Gauge “Zero”
Note: In order to provide an accurate reading, the indicating
needle of the static pressure gauge should be precisely at zero
when the cabinet is shut off. If the cabinet is connected to a
central exhaust system, the exhaust system must also be shut
off.
Following HEPA filter replacement, the static pressure
gauge should be checked for zero when the cabinet is shut off.
Refer to Section 8.2. When the cabinet is started up and proper
airflow balance has been reached, the reading on the gauge
should be recorded. This initial reading will serve as a baseline
indication of subsequent filter loading. When the reading
increases by approximately 50%, the airflow balance should
again be checked. Replacement of the filters may be required
(Section 9.3).
8.2 Zeroing the Static Pressure Gauge
1. Turn the cabinet off.
2. Remove the front cover from the static pressure gauge
by grasping the front cover and turning it counterclock-
wise.
3. Locate the Allen-type adjustment screw beside the gauge
needle.
4. Turn the adjustment screw counterclockwise to lower
the reading; clockwise to raise it.
8.3 Adjusting the Damper
Since the HEPA filter resistance may vary from filter to fil-
ter (even filters of the same size), a damper has been installed
in the cabinet exhaust system for maintaining proper airflow
balance. The purpose of the damper is to regulate the amount of
exhaust air, intake velocity and supply velocity. The damper has
been preset at the factory and should not be readjusted unless
the proper velocities cannot be obtained.
Adjustments must be made by qualified personnel
only!

1. Layout test grids (refer to Section 8.4).
2. Start-up the cabinet and allow it to run for at least twen-
ty minutes.
3. Take airflow measurements. If airflow specifications are
not sufficient, open the control panel and check the volt-
age on the power switch.
Note: Airflow measurements and voltages are recorded at the
factory with the cabinet connected to the appropriate AC power
supply.
4. Open the access panel (Figure 4-1) and locate the blow-
er motor circuit board. (Figure 4-3) Using a true RMS
voltmeter, measure and record the voltage drop across
the white and black wires leading to the terminal strip.
(Figure 4-4) The blower speed control adjustment pot is
located on the upper left side of the board. Clockwise
adjustment of this pot increases voltage supply to the
blower motor, counterclockwise adjustment lowers the
voltage supply. Adjust it 2-3 volts, up or down, depend-
ing upon the airflow required. Retake the airflow meas-
urements.
If it is determined that the damper must be adjusted in
order for the proper airflow balance to be maintained, adjust it
as follows:
1. The damper control (Figure 8-1 below) is located on the
top of the cabinet.
2. Loosen the wingnut, move the lever to the desired posi-
tion and retighten the wingnut.
Figure 8-1
8.4 Biological Safety Cabinet Test Grids
a. 4-foot Series, Models 1284, 1285, and 1288
Model 1280/1290 Series ________________________________________________________________Routine Maintenance
8 - 2

b. 6-foot Series, Models 1286, 1287, 1290, and
1291 Section 9 - Service
Service to the unit must be performed by qualified
personnel. Recertify the cabinet after servicing.
Before service is to be performed on the cabinet,
the unit must be decontaminated!
9.1 Replacing the Blower Motor (Models, 1284, 1285
and 1288, 4-foot)
a. Reversing the motor wiring (4 foot models only)
1. On the replacement motor: Disconnect the faston con-
nectors securing the Orange wire to the Brown wire and
Yellow wire to the Purple wire.
2. Reconnect the Orange wire to the Purple wire and the
Yellow wire to the Brown wire.
b. Replacing the motor
1. Turn the unit off and disconnect it from the power
source.
2. Remove all dress panels.
3. Remove the access panel.
4. Unfasten the two latches connecting the blower to the
air plenum.
5. Remove the bolt toward the front of the cabinet that
connects the blower housing bracket to the top of the
cabinet.
6. Remove the front screw on the right hand side of the
cabinet that connects the blower housing bracket to the
right hand wall of the cabinet.
7. Loosen -do not remove- the two remaining bolts that
connect the blower housing bracket to the top of the
cabinet.
8. Loosen -do not remove- the two remaining screws that
connect the blower housing bracket to the right wall of
the cabinet.
9. Slide the blower housing toward the rear of the cabinet
as far as it will go.
10. Unbolt the removable inlet collar from the blower hous-
ing.
Model 1280/1290 Series ___________________________________________________________________________Service
9 - 1

11. Unbolt the four-point motor mounting bracket from the
blower housing.
12. Disconnect the motor wiring harness at the quick-con-
nect plug.
13. Pull the motor, motor mounting bracket, removable inlet
collar and blower wheel out of the blower housing.
14. Be sure to mark on the motor shaft the location of the
blower wheel so that the new motor shaft can be lined
up correctly with the required blower wheel position to
fit properly inside the blower housing.
Note: After the motor is installed, but before replacing the
plenum access panel, turn the motor on to ensure that rotation is
in the clockwise direction (when viewed from the motor side of
the blower).
9.2 Replacing the Blower Motor (Model 1286 Series
6-foot)
1. Turn the unit off and disconnect it from the power
source.
2. Remove all dress panels.
3. Remove the access panel.
4. Unfasten the two latches connecting the blower to the
air plenum.
5. Remove the two bolts toward the front of the cabinet
that connect the blower housing brackets to the top of
the cabinet.
6. Loosen - do not remove- the four remaining bolts that
connect the blower housing brackets to the top of the
cabinet.
7. Slide the blower housing toward the rear of the cabinet
as far as it will go.
8. Disconnect the motor wiring harness at the quick-con-
nect plug.
9. Unbolt the removable inlet collar from the blower hous-
ing.
10. Pull the motor, motor mounting bracket, removable inlet
collar, and blower wheel out of the blower housing.
11. Be sure to mark on the motor shaft the location of the
blower wheel so that the new motor shaft can be lined
up correctly with the required blower wheel position to
fit properly inside the blower housing.
9.3 Replacing the Filters, All Models
Dispose of the old filters per established laborato-
ry practices. If necessary, consult a bio-safety
officer or other appropriate person.
1. Turn the unit off and disconnect it from the power
source.
2. Close the window.
3. Remove the screw on the bottom left side, which secures
the control panel, and swing the panel open.
4. Remove the eight screws securing the dress panel.
Remove the panel and set it aside.
5. Remove the four hex nuts securing the lower cross brace
and set the brace to the side.
6. Remove all hex nuts securing the pressure plate.
7. Pry the pressure plate loose from the gasket and set it to
the side.
8. Pull the Velcro boot loose from the exhaust filter
plenum.
9. Release the two latches securing the supply plenum to
the blower housing.
10. Disconnect the vinyl tubing that connects the Mag gauge
to the plenum.
11. Remove the hex nuts (4 on the four-foot models, 6 on
the six-foot models), springs, washers and hold-down
brackets securing the plenum.
12. Remove the front filter hold-down studs (2 on the four-
foot models, 3 on the six-foot models) in front of the
plenum.
13. Slide the plenum from the cabinet.
14. Remove the supply filter and clean the filter flange.
15. Loosen - do not remove- the four bolts, springs and
washers that secure the exhaust filter.
16. Slide the exhaust filter out, clean the filter flange and
install the new filter, ensuring that the gasket is on the
top.
17. Tighten the hex nuts to secure the new exhaust filter in
position.
18. Install the new supply filter with the gasket side down.
19. Reinstall the supply plenum and assemble the compo-
nents in reverse order.
The cabinet must be recertified after filter replacement.
Model 1280/1290 Series ___________________________________________________________________________Service
9 - 2

Assembly Notes:
• Latches connecting the plenum to the blower housing have
a safety lock that must be released prior to opening the
latch.
• When tightening the filter hold-down nuts, the springs
should be compressed from 1/2 to 3/4 of their original
height.
• Ensure that the vinyl tubing from the Mag gauge is recon-
nected to the supply plenum.
• The Velcro connection on the exhaust boot must be smooth
with no gaps or loose spots to ensure proper sealing.
Model 1280/1290 Series _______________________________________________________________________Specifications
10 -1
Section 10 – Specifications
10.1 Models - 1284, 1285, and 1288 (4’ Cabinet with
Sliding Window)
Construction Work Surface: Type 304
Stainless Steel, #4 Finish
Cabinet: Cold Rolled Steel and
Type 304 Stainless Steel
Finish: Antique White
Baked Powder TCI Hybrid Paint
Dimensions Exterior: 54.0”W x 64.0”H x 32.5”F-B
Interior: 49.0”W x 28.3”H x 22.25”F-B
Electrical Requirements
1284 Main/Outlets (5): 115VAC, 1 Phase,
2 Wire, 60 Hz, 14 FLA
(Total amps include 5A receptacle)
Circuit Breaker: 20 Amp
Receptacle - NEMA 5-20R
Exhaust System Volume
Requirements: 356-390 CFM
1285 Main/Outlets (5): 230VAC, 1 Phase,
2 Wire, 50 Hz, 11 FLA
(Total amps include 5A receptacle)
Circuit Breaker: 15 Amp
Receptacle - European
Exhaust System Volume
Requirements: 356-390 CFM
1288 Main/Outlets (5): 100VAC, 1 Phase,
2 Wire, 50 Hz, 14 FLA
(Total amps include 5A receptacle)
Circuit Breaker: 20 Amp
Receptacle - NEMA 5-20R
Exhaust System Volume
Requirements: 356-390 CFM
Filters (1) Supply HEPA Filter (48”W x
18”F-B x 5-7/8”H)
(1) Exhaust HEPA Filter (18”W x
24”F-B x 5-7/8”H)

1291 Main/Outlets (5): 100VAC, 1 Phase,
2 Wire, 60 Hz, 16 FLA
(Total amps include 2A receptacle)
Circuit Breaker: 20 Amps
Receptacle - NEMA 5-15R
Exhaust System Volume
Requirements: 530-581 CFM
Filters (1) Supply HEPA Filter (72”W x
18”F-B x 5-7/8”H)
(1) Exhaust HEPA Filter (24”W x
24”F-B x 5-7/8”H)
Lights
1286/1290/1291 (2) Fluorescent 85W,
(F72T12/N/HO)
1287 (2) Fluorescent 85W,
(F72T12/CW/HO)
(1) Optional UV 30W,
(G30T8) Germicidal Lamp
Blower Motor 3/4 HP, 1500 RPM
Drain Pan Capacity 27.0 Gallons
Model 1280/1290 Series ______________________________________________________________________Specifications
10 -2
Lights (2) Fluorescent 60W,
(F48T12/CWX/HO)
(1) Optional UV 30W, (G30T8)
Germicidal Lamp
Blower Motor 3/4 HP, 1625 RPM
Drain Pan Capacity 18.7 Gallons
10.2 Models - 1286, 1287, 1290 and 1291 (6’ Cabinet
with Sliding Window)
Construction Work Surface: Type 304
Stainless Steel, #4 Finish
Cabinet: Cold Rolled Steel and
Type 304 Stainless Steel
Finish: Antique White
Baked-on Powder TCI Hybrid Paint
Dimensions Exterior: 78.0”W x 64.0”H x 32.5”F-B
Interior: 73.0”W x 28.3”H x 22.25”F-B
Electrical Requirements
1286 Main/ Outlets (5): 115VAC, 1 Phase,
2 Wire, 60 Hz, 15 FLA
(Total amps include 2A receptacle)
Circuit Breaker: 20 Amps
Receptacle - NEMA 5-15R
Exhaust System Volume
Requirements: 530-581 CFM
1287 Main/Outlets (5): 230VAC, 1 Phase,
2 Wire, 50 Hz, 8.5 FLA
(Total amps include 2A receptacle)
Circuit Breaker: 20 Amps
Receptacle - European
Exhaust System Volume
Requirements: 530-581 CFM
1290 Main/Outlets (5): 100VAC, 1 Phase,
2 Wire, 50 Hz, 13.5 FLA
(Total amps include 2A receptacle)
Circuit Breaker: 20 Amps
Receptacle - NEMA 5-15R
Exhaust System Volume
Requirements: 530-581 CFM