Fisher Scientific Isotemp Plus 13-986-142A User manual

Isotemp Plus
General Purpose Laboratory Freezers
with Alarm Version Controls
Catalog Numbers:
13-986-142A/RA
13-986-143A/RA
13-986-144A/RA
13-986-146A/RA
13-986-147A/RA
104843 • Rev. A

Introduction ............................................................................................................................................................................3
Safety Precautions ..........................................................................................................................................................3
Performance Characteristics ..........................................................................................................................................3
Installation ..............................................................................................................................................................................4
Unpacking........................................................................................................................................................................4
Visible Loss or Damage ..................................................................................................................................................4
Concealed Loss or Damage............................................................................................................................................4
Packing List ....................................................................................................................................................................5
Selecting a Location ........................................................................................................................................................5
Installing and Leveling Casters ......................................................................................................................................5
Shelves............................................................................................................................................................................6
Electrical Connection ......................................................................................................................................................6
Controls ..................................................................................................................................................................................7
Panel Controls ................................................................................................................................................................7
Displays and Features ....................................................................................................................................................7
Key Switch................................................................................................................................................................7
Temperature Display ................................................................................................................................................8
Unit’s LED’s..............................................................................................................................................................8
Mode LED ................................................................................................................................................................8
Cool LED ..................................................................................................................................................................8
Alarm LED’s..............................................................................................................................................................8
Keypads ..................................................................................................................................................................9
Interior Light Switch..................................................................................................................................................9
Operation ..............................................................................................................................................................................10
Controller Set Up (Menus) ............................................................................................................................................10
Temperature Setpoint ............................................................................................................................................11
Units........................................................................................................................................................................11
High Alarm Set Point ..............................................................................................................................................11
Low Alarm Set Point ..............................................................................................................................................11
Alarm Silencing Menu ............................................................................................................................................12
Alarm Test Menu ....................................................................................................................................................12
Calibration Offset....................................................................................................................................................12
Hold-Off Time ........................................................................................................................................................13
Control Mode ................................................................................................................................................................13
Loading ..................................................................................................................................................................13
Temperature Digression ........................................................................................................................................13
Alarms ..........................................................................................................................................................................14
Over Temp Alarm....................................................................................................................................................14
Under Temp Alarm..................................................................................................................................................15
Door Ajar Alarm ......................................................................................................................................................15
Power Loss Alarm ..................................................................................................................................................15
Alarm Silencing ......................................................................................................................................................15
Alarm Test ..............................................................................................................................................................15
Remote Alarm Contacts ........................................................................................................................................16
Open Sensor ..........................................................................................................................................................17
Battery Back Up ............................................................................................................................................................17
Calibration Using Temperature Offset ..........................................................................................................................18
Defrost Timer ................................................................................................................................................................18
Maintenance ........................................................................................................................................................................19
Cabinet Cleaning ..........................................................................................................................................................19
Cleaning the Condensor................................................................................................................................................19
Condensate Evaporator Pan ........................................................................................................................................19
Troubleshooting ....................................................................................................................................................................20
Replacement Parts ..............................................................................................................................................................21
Wiring Diagrams ..................................................................................................................................................................22
Warranty ..............................................................................................................................................................................24
2
Table of Contents

3
This manual is intended to provide installation and operat-
ing instructions for Isotemp Plus Alarm version freezers.
The alarm version control system provides both audible
and visual indication of alarm conditions in an easy to
read display format. In addition, there are two sets of
contacts available for remote alarm switching.
Temperature and alarm set points are directly entered in
°C or °F. More about setting up the controller and all the
options are discussed in the Operating section of this
manual.
Safety Precautions
Your satisfaction and safety are important to Fisher
Scientific, a complete understanding of this unit is neces-
sary to attain these objectives.
As the ultimate user of this apparatus, it is your responsi-
bility to understand its proper function and operational
characteristics. This instruction manual should be thor-
oughly read and all operators given adequate training
before attempting to place this unit in service. Awareness
of the stated cautions and warnings, and compliance with
recommended operating parameters – together with
maintenance requirements – are important for safe and
satisfactory operation. The unit should be used for its
intended application; alterations or modifications will void
the Warranty.
This product is not intended, nor can it be used, as a ster-
ile or patient connected device. In addition, this appara-
tus is not designed for use in Class I, II or III locations as
defined by the National Electrical Code, unless otherwise
noted.
Performance Characteristics
Temperature Range: -30° to 0°C (-22° to 32°F)
Temperature Stability: ±4°C
Introduction
Warning
As a routine laboratory precaution,
always wear safety glasses when
working with this apparatus.
Warning
This product is NOT approved for
storage of flammable or explosive
materials. Also, it is NOT approved
for use in hazardous locations con-
taining explosive atmospheres.
Warning
High voltage is supplied to PC board
when key switch is OFF.
DANGER: RISK OF CHILD ENTRAP-
MENT. BEFORE YOU THROW AWAY
YOUR OLD REFRIGERATOR OR
FREEZER:
•TAKE OFF DOORS
•LEAVE THE SHELVES IN THE
PLACE SO THATCHILDREN MAY
NOT EASILY CLIMB INSIDE.

Unpacking
Save all packing material if apparatus is received dam-
aged. This merchandise was carefully packed and thor-
oughly inspected before leaving our factory.
Responsibility for its safe delivery was assumed by
the carrier upon acceptance of the shipment; there-
fore, claims for loss or damage sustained in transit
must be made upon the carrier by the recipient as fol-
lows:
Visible Loss or Damage
Note any external evidence of loss or damage on the
freight bill, or express receipt, and have it signed by the
carrier’s agent. Failure to adequately describe such
external evidence of loss or damage may result in the
carrier’s refusing to honor your damage claim. The carri-
er will supply the form required to file such a claim.
Concealed Loss or Damage
Concealed loss or damage refers to loss or damage,
which does not become apparent until the merchandise
has been unpacked and inspected. Should either occur,
make a written request to the carrier’s agent within 15
days of the delivery date; then file a claim with the carrier
since the damage is the carrier’s responsibility.
If you follow the above instructions carefully, we will guar-
antee our full support of your claim to be compensated for
loss from concealed damage.
DO NOT – FOR ANY REASON – RETURN THIS UNIT
WITHOUT FIRST OBTAINING AUTHORIZATION
4
Installation

Packing List
The following items are packed in the envelope located
inside the freezer chamber. If any of the following items
are not present, report the missing item to your local
Fisher representative.
1. Warranty Card
2. Instruction Manual
3. Door Lock Key
4. Power Switch Key
5. Chart Recorder Instructions (Catalog No.’s with
“R”)
Selecting a Location
Choose a location for the freezer that will provide at least
three inches of clearance between the cabinet and any
adjacent vertical surface at the sides and rear.
Appropriate electrical power must be available. Locate
the freezer within 6 feet of the power outlet so that no
extension cord is required.
Installing and Leveling Casters
Isotemp Plus freezers come with four casters, which
thread into the base of the unit, one in each corner. Use
the wrench provided to thread the casters completely into
the base of the unit. Back the casters in or out until the
unit is level and resting on all four casters. See Figure 1.
UNPACKING AND INSTALLATION
Freezer Base
Thread casters directly
into base at four corners.
Tighten using
wrench provided.
Note
The freezer must be level in order to
provide adequate condensation
drainage as well as proper door
alignment and operation. The freez-
er should be in its final operating
location and set so that it is firmly
positioned on the floor.
5
Figure 1

Shelves
Shipped inside each cabinet are 3 epoxy coated shelves
per door opening. Epoxy coated filler shelves are provid-
ed for units with more than one door. Shelf supports,
located in the plastic bag, are pushed into the side
pilasters, one in each corner, at the desired shelf height.
Replacement shelves are available individually. See
Replacement Parts for shelf part numbers.
Electrical Connection
Determine the total amount of current presently being
used by other apparatus connected to the circuit that will
be used by this freezer. It is critical that this added cur-
rent demand and other equipment on this circuit not
exceed the rating of the fuse or circuit breaker in use.
The frequency and nominal voltage requirements for the
unit are specified on the data plate, which is located on
the interior upper left side. Plug the unit only into a power
source that meets these requirements. Low line voltage
is often the cause of service complaints. With the unit
running, check that the line voltage is within ±10% of that
specified on the data plate.
The customer should have the wall receptacle and circuit
checked by a qualified electrician to verify the receptacle
is properly grounded and is connected to the proper
power supply. The following list gives the NEMA
plug/receptacle configuration for the corresponding freez-
ers.
6
UNPACKING AND INSTALLATION
Caution
If the unit was tilted in excess of 30
degrees, level it and do not apply elec-
trical power for a minimum of 12 hours.
Warning
Be sure that the power supply is the
same voltage that is specified on the
freezer’s data plate.
Warning
For personal safety this unit must be
properly grounded. DO NOT under
any circumstance cut or remove the
ground prong from the power cord.
DO NOT use a plug adapter that elimi-
nates the ground prong. 115VAC Units
NEMA 6-20P
, 6-20R
13-986-142A/RA
13-986-144A/RA
13-986-146A/RA
230VAC Units
NEMA L14-20P, L14-20R
13-986-143A/RA
13-986-147A/RA
Caution
Do not use an extension cord. Use of
an ungrounded cord or an overloaded
circuit VOIDS the compressor warran-
ty. Refer to wiring diagrams when
connecting freezer to its power
source.
Figure 2

Panel Controls
Before operation, it is necessary to become familiar with
the freezer controls. All the freezer controls are located
on the header panel. A layout of the controller and LED’s
are given below.
Displays and Features
On the right side of the header panel is the key switch.
The key switch has three positions, OFF (O), Set-up (I)
and Alarm Enable (). With the freezer plugged in and
the key switch in the OFF position, the displays and
refrigeration system are off. The control board remains
energized in order to supply a charge to the battery.
Key Switch
Turning the key switch to the middle position energizes
the circulation fans and the controller display. The middle
position is known as the Set Up mode. When the con-
troller is in the Set Up mode, the menu items can be set
to the desired values. See Controller Set Up for a
description of each. Once all menu items are set, the
7
Controls
O
I
POWER
3-Position Key Switch
Menu Keypad
Up Arrow Keypad
Down Arrow Keypad
Alarm LED'S
Temperature Display
Warning
High voltage is supplied to PC board
when key switch is OFF.
Figure 3

freezer can then be switched to the Alarm Enable posi-
tion. While in the Alarm Enable position, the menu items
can be viewed but not changed. The key can then be
pulled to secure the values entered.
Temperature Display
The temperature display indicates chamber temperature
while in the control mode of operation and menu titles and
values while entering menu items (see Menus).
Units LED’S
The temperature display indicates chamber temperature
in both °C and °F. The current units are indicated by the
corresponding LED located to the right of the temperature
display.
Mode LED
The Mode LED is lit when the Menu keypad has been
pressed. It indicates to the user that the controller is in
the menu selection mode.
Cool LED
The Cool LED is lit when the controller calls for cooling.
When this LED comes on the compressor should ener-
gize.
Alarm LED’S
Door Ajar - This LED is illuminated when a freezer door(s)
is opened.
Over Temp – Indicates the current chamber temperature
exceeds the high alarm temperature set point.
Under Temp – Indicates the current chamber temperature
is lower than the low alarm temperature set point.
Power Out – Indicates AC power to the freezer is disrupt-
ed.
Alarm Test – Indicates the controller is running an alarm
test.
8
CONTROLS
Note
The key can be pulled in the Off or
the Alarm Enable position.

Keypads
Menu Keypad – Pressing the Menu keypad enters the
controller into the menu selection mode, designated by
the illumination of the MODE LED. Repeatedly pressing
the Menu keypad cycles through the list of menu items
(see Menus). After the final menu, the controller returns
to the control mode and the MODE LED turns off.
Up Arrow Keypad – Increases or changes menu values.
Down Arrow Keypad - Decreases or changes menu val-
ues.
Interior Light Switch
The interior lamp(s) is controlled by the door switch. If the
interior lamp fails, replace with the same size and wattage
lamp. DO NOT USE REDUCED WATTAGE LAMPS.
The reduced wattage lamps generally fail to light below
60°F (15°C).
9
CONTROLS

The freezer is started by inserting the power switch key,
which is found in the envelope inside the unit, into the key
switch. Turn the key to the middle (set up) position. The
internal fans will start and the display will flash between
Pout and the current chamber temperature. The Pout
(power out) display indicates to the user that the con-
troller has sensed a low voltage condition. This condition
is normal during any start-up. See the Alarms section for
details on the Pout message. Press any keypad to clear
the Pout.
The compressor has a time delay prior to activation (see
hold-off menu). This is to assure the system pressure is
given time to equalize before the compressor starts. After
the delay, the compressor LED lights and the compressor
starts.
During normal operation (control mode), the freezer tem-
perature is displayed on the 4-character display. The
compressor cycles on and off to control the chamber tem-
perature between -30.0 and 0.0°C (-22.0 to 32.0°F),
selectable by the user. The temperature set point,
high and low alarm set-points, units and display offset can
be changed while the key switch is in the setup (middle)
position. These values can be viewed but not changed
with the key switch is in the alarm position. The menu
options are explained in the following sections.
Controller Set Up (Menus)
There are 6 menus to select from, each can be accessed
by pressing the Menu keypad. Pressing the Menu key-
pad once brings up the first menu, which is the tempera-
ture set point. The displays initially flash SP followed by
the last set temperature value. Pressing the Menu key-
pad again, accepts the value and displays the next menu,
units select (CF). Each menu value is entered this way.
The menus can be changed only while the key switch is
in the set up (I) position. They can be viewed but not
changed while the key switch is in the alarm enable ()
position. The individual menus are described below.
10
Operation
Note
The Pout display is a normal occur-
rence when power is first applied to
the controller. Press any key to
clear it.

Temperature Setpoint
• Temperature Set Point (SP) – Adjustable from -
30.0 to 0.0°C or -22.0 to 32.0°F. Use the
Up/Down Arrow keypads to change the temper-
ature and the Menu keypad to enter the value
and switch to the next menu.
Units
• Units select (C,F) – Selects the desired temper-
ature display units in °C or °F. Use the Up
Arrow keypad to change the units from C to F.
Use the Down Arrow keypad to switch from F to
C. Press the Menu keypad to enter the units
value and continue. The appropriate units LED
will indicate the selected units.
High Alarm Set Point
• High Alarm Set Point (AH) – Use the Up/Down
Arrow keypad to adjust the value that triggers a
high alarm condition if the chamber temperature
rises above it. The high alarm temperature
range is from 3.5°C (6.3°F) above the
Temperature Set Point to 37.0°C (98.6°F).
For example: If the Temperature Set Point = -10.0°C, the
High Alarm Set Point can be set anywhere from -6.5°C to
37.0°C.
Low Alarm Set Point
• Low Alarm Set Point (AL) – Use the Up/Down
Arrow keypad to adjust the value that triggers a
low alarm condition. The low alarm condition
occurs when the actual chamber temperature
drops below the Low Alarm Set Point. The low
alarm range is from 3.5°C (6.3°F) below the
Temperature Set Point to -36.0°C (-32.8°F).
For example: If the Temperature Set Point = -10.0°C, the
Low Alarm Set Point can be set anywhere from -13.5°C to
-36.0°C.
11
CONTROLS

Alarm Silencing Menu
• Alarm Silencing (AS) – During an alarm condi-
tion, while the key switch is in the Alarm Enable
Mode, this menu allows the user to silence the
audible alarm for 5 minutes. After the AS stops
flashing, the display will show n, press the Up
Arrow keypad to change the display to y. Press
the Menu Keypad and the audible alarm will turn
off for 5 minutes.
Alarm Test Menu
• Alarm Test (At) –Use the Up Arrow keypad to
change the nto H. By subsequently pressing
the Menu Keypad the controller will perform a
High Alarm Test (see Alarm Test in Alarms sec-
tion). Use the Down Arrow Keypad to change
the display to L. Pressing the Menu Keypad will
activate the Low Alarm Test. Pressing the Menu
Keypad while the display shows nreturns the
unit to control mode (MODE LED off).
NOTE: While in any of the above menu options, the
controller will wait 15 seconds for a new value to be
entered. If there is no keypad activity within 15-sec-
onds, the freezer will automatically shift to the
Control Mode and the Mode LED will turn off.
The two final menu items, calibration offset and hold-off
time (oS and Ho), are not accessible from the main menu.
In order to view and/or change them, the Menu keypad
must be pressed and held for 5 seconds.
Calibration Offset
• Display Offset (oS) – Use the Up/Down Arrow
keypads to adjust the offset value. Adjustable to
±5.0°C (±9.0°F). This value is added to the
temperature display to correct for differences
between actual and displayed chamber temper-
ature. See Calibration… for details. Press the
Menu keypad to enter the new value or to con-
tinue to the next menu.
12
CONTROLS

Hold-Off Time
• Hold-Off (Ho) – Use the Up/Down Arrow key-
pads to adjust the Hold-Off time in minutes.
Adjustable from 3 to 10. This value represents
the delay time between compressor activations.
Press the Menu keypad to enter the new value
and return to temperature control mode.
Control Mode
The Control Mode of operation is indicated when the
Mode LED is OFF. With the desired temperature set
point and alarm values entered, the freezer will then
begin to control to the set temperature. The default delay
between compressor activations is 5 minutes. This delay
begins the moment the controller is energized or the
moment the compressor turns off during normal opera-
tion. The delay is added to provide time for the system
pressure to drop before the compressor tries to start
again.
Loading
Follow the guidelines below in order to provide optimal
freezer performance:
• When loading with critical samples, verify all
alarms and features are operating properly.
• Space samples uniformly in the chamber.
• Keep samples away from the back wall that may
obstruct airflow.
• It is best to load the freezer from bottom to top.
Keeping the area next to the air intake and
exhaust clear will help assure proper airflow.
Temperature Digression
By pressing the Increase keypad while the freezer is in
the Control Mode, the display will show the warmest tem-
perature recorded since the unit was energized or the
13
CONTROLS

digression values were reset. Pressing the Decrease
keypad will display the coldest temperature recorded
since the unit was energized or the digression values
were reset.
To reset the temperature digression values, simply press
the Increase and Decrease keypads at the same time.
The display will show Clr, indicating the controller will
begin recording new warm and cold digressions once
more.
Alarms
Alarm Version Freezers are equipped with audible and
visual alarms. They also feature remote alarm contacts.
The key switch must be in the Alarm Enable position for
the audible alarm and remote alarm contacts to activate.
Alarm messages are shown on both the temperature dis-
play and in the row of Alarm LED’s located above the
temperature display. The following conditions will trigger
an alarm:
• Chamber temperature is greater than the high
alarm set point.
• Chamber temperature is less than the low alarm
set point.
• Door has been left open for 3 minutes or more.
• AC power has been interrupted to the freezer.
• Open sensor
Over Temp Alarm
If the freezer chamber temperature rises above the High
Alarm Set Point, the display will alternately flash the
freezer chamber temperature and “HigH”. The Over
Temp LED will be lit, the audible alarm will sound and the
remote contacts will change state.
14
CONTROLS

Under Temp Alarm
If the freezer chamber temperature falls below the Low
Alarm Set Point, the display will alternately flash the
freezer chamber temperature and “Lo”. The Under Temp
LED will be lit, the audible alarm will sound and the
remote contacts will change state.
Door Ajar Alarm
When a door is opened, the Door Ajar LED lights and the
display alternately flashes between the freezer tempera-
ture and “door”. If a door is opened for 3 minutes, the
audible alarm will sound and the remote alarm contacts
change state.
Power Loss Alarm
When AC power is lost, the display will alternately flash
between the current freezer temperature and “Pout”, the
Power Out LED will light, the audible alarm will sound and
the remote contacts will change state. When power is
restored, the display will continue flashing the “Pout” mes-
sage until it is cleared by the user by pressing any of the
keypads.
Alarm Silencing
The audible alarm can be silenced by deactivating it at
the Alarm Silence Menu (see section earlier in this manu-
al). The audible alarm will silence for 5 minutes. It will
sound again at the end of the 5 minutes if the alarm con-
dition persists. Alarm silencing does not affect the visual
alarms.
Alarm Test
The Alarm Test feature is used to verify proper alarm
operation by simulating an increase or decrease in cham-
ber temperature. The alarm test function will work for any
value of high or low alarm set points. With the key switch
in the Set Up Position the remote and audible alarms are
not activated during an alarm test, as is the case in an
actual alarm condition.
NOTE: The key switch should be in the Alarm Enable
Position in order to test all alarm features.
15
CONTROLS
Note
Power must be off for 30 seconds to
activate an alarm.

The procedure for testing the alarms is simple. Press the
Menu Keypad repeatedly until the display shows At
(alarm test). Momentarily, the display will change to n.
Press the Up Arrow Keypad to change the display from n
to Hin order to perform a high alarm test. With the dis-
play showing H, press the Menu Keypad again and the
temperature display will begin to rise until it reaches the
High Alarm Set Point. Once the set point is reached, both
audible and visual alarms should be activated (with the
key switch in alarm enable position) and the remote alarm
contacts should change state. To perform a low alarm
test, simply press the Down Arrow Keypad when the dis-
play shows n. The display will then show L. Press the
Menu Keypad again in order to activate the low alarm
test.
During an Alarm Test, the Alarm Test LED is lit. The Alarm
Test can be terminated at any time by pressing any of the
keypads.
Remote Alarm Contacts
In addition to the audible and visual alarms, there are two
sets of remote contacts on the side of the header panel,
which change state during an alarm. The upper set of
contacts provides both normally open and normally
closed switching. The lower set of contacts is used for
the Fisher Deluxe Remote Alarm System (see Freezer
Accessories).
16
CONTROLS
Header Panel
Remote Alarm
Contacts
Figure 4

All contacts are capable of switching up to 24 volts
AC/DC and 2 amps. The common (C) and normally
closed (NC) contacts open during an alarm. The com-
mon (C) and normally open (NO) contacts close during an
alarm. The contacts for the Deluxe Remote Alarm are
normally closed and open during an alarm. Figure 4
shows the location of the remote and deluxe alarm con-
tacts.
Remote alarm contacts are active only with the key switch
in the Alarm Enable position.
Open Sensor
When the controller is unable to read from the sensor, the
display will show SnSr, indicating that a sensor error
exists. When a sensor error occurs, the controller will
delay before activating a High Alarm condition. The High
Alarm follows the sensor (SnSr) error since the tempera-
ture of an open sensor is interpreted as a temperature too
high for the controller to read. The display will then alter-
nately flash “SnSr” and “HigH”.
Battery Back Up
The Isotemp Plus Alarm Version Freezers are supplied
with a rechargeable battery back up. The battery will con-
tinue to supply power to the controller and alarm features
in the event of a power outage. A fully charged battery
can continue powering the controller for up to 6 hours.
The battery is recharged by the temperature controller
during normal operation. The battery should be checked
every six months and replaced when necessary (see
Replacement Parts). Check the battery by unplugging the
freezer and monitoring the controller operation. If the
controller does not properly activate the alarm features for
2 hours, replace the battery. Under normal operation,
the battery back up should last up to four years or 200
charge/discharge cycles.
17
CONTROLS

Calibration Using Temperature
Offset
In the event the freezer needs to be calibrated, a simple
routine is available to adjust the display and control point
to a referenced standard. To set a temperature offset
while in the Control Mode (mode LED off), simply press
and hold the Menu keypad. The display will flash oS fol-
lowed by the last temperature offset value. The factory
setting is 0.0. To change the offset value, press the
Increase or Decrease keypad to the value which when
algebraically added to the last displayed temperature, will
agree with the reference temperature. Next, press the
Menu keypad twice to cycle past the hold-off (Ho) menu
and back to the normal display mode. The Mode LED
turns off.
For Example:
The display indicates -4°C but a reference thermometer in
the freezer chamber indicates -6°C. The operator press-
es the Menu KEY twice and changes the offset (oS) dis-
play value from 0.0 to -2.0. The Menu key is pressed
repeatedly until the Mode LED turns off. Now the display
indicates a chamber temperature of -6.0°C (approx.) and
the controller begins to cool to the desired temperature of
4.0°C. Allow an additional 30 to 40 minutes for the freez-
er to again stabilize. If the display is still inaccurate,
repeat the calibration procedure.
Defrost Timer
All freezers come equipped with a 24 hour defrost timer.
The timer will trigger a defrost cycle 4 times per 24 hours.
When a defrost cycle begins, the display will alternately
flash dfSt and the current chamber temperature. The
defrost cycle typically lasts for 30 minutes or so,
depending on the last freezer temperature. When a
defrost cycle begins, the High Alarm is disabled for a peri-
od of 40 minutes. This is to provide enough time for the
defrost cycle to occur and for the freezer temperature to
drop below the high alarm set point after the defrost peri-
od has ended.
18
CONTROLS
Caution
DECREASING the offset value
INCREASES the temperature at which
the system controls. If the offset is
inadvertently set too low, the chamber
temperature can rise above freezing
when attempting to control at 0.0°C..

19
Cabinet Cleaning
The cabinet interior should be cleaned frequently. Any
spilled liquid should be wiped off immediately. Stains
resulting from some spills can be permanent if not quickly
removed. The cabinet exterior should be cleaned occa-
sionally. A mild detergent and lukewarm water or a solu-
tion of bicarbonate of soda (1 tablespoon per gallon of
water) is recommended for cleaning the interior and exte-
rior of the cabinet. All surfaces should be rinsed and thor-
oughly dried.
Cleaning the Condenser
The condenser is located in front of the compressor fan,
which is on the top, left side of the freezer. The condens-
er should be cleaned before becoming clogged with
dirt/dust. Construction or other dirt causing environments
may significantly increase the required frequency. The
condenser should be cleaned at least once a year.
Failure to keep the condenser clean does void the
unit warranty.
Condensate Evaporator Pan
The condensate evaporator pan is located behind the
compressor fan, which is on the top, left side of the freez-
er. This pan should be cleaned at least once a year to
prevent foul odors and operate efficiently. Vacuum
clean if dry, or sponge clean with soapy water.
Maintenance
Caution
When servicing the unit, disconnect
plug from the electrical power source.
Caution
Do not use any type of abrasive such
as steel wool or fluids, such as gaso-
line, Naptha or paint thinner. These
materials could be harmful to plastic
materials, door gasket and painted sur-
faces.
Caution
Accessing and cleaning the conden-
sate coil or pan should be done by
qualified personnel.

20
Symptom Probable Cause Action
Does Not Run Unit Unplugged Plug in unit.
Blown fuse or tripped circuit breaker. Check fuse or circuit breaker at
breaker box.
Key switch is in the OFF (O) Turn key switch to ON (I).
position.
Runs Continuously Frost buildup on refrigeration Turn unit off and allow it to defrost.
coils.
Freezer over-loaded. Remove contents from top shelf of
unit.
Faulty solid state relay. Call for service.
Clicking Sound The compressor is equipped with Disconnect power and allow unit to
a thermal protector. This device sit for about an hour, then retry. If
shuts off the compressor when it condition persists, call for service.
becomes too hot. A clicking sound
occurring about every 30 seconds
indicates this protector is working.
Insufficient Cooling Set temp is too high. Reduce temperature setting, verify
Cool LED turns on in 3 minutes.
Offset (oS) value is too low. Increase offset value.
Condenser coil dirty. Clean condenser coil with a vacuum
cleaner.
Unit frosted. Defrost unit.
Circulating fans not on. Verify doors are completely closed.
Defrost mode activated. Allow enough time for defrost mode
to end (2 hours max.)
This table is intended to assist in resolving user-correctable freezer problems by relating symptoms to their
likely causes. If service beyond the scope of this table is required, contact Fisher Scientific Service Division
at 1-800-438-4851.
Troubleshooting