Thermo Scientific 902 Operating instructions

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Forma Model 900 Series
-86C ULT Upright Freezer
Operating and Maintenance Manual 7090902 Rev. 17
User Manual

Thermo Scientific
Preface
Model 900 and 5900 Series i
Packing List
MA UAL UMBER 7090902
17 41728 10/02/17 Added Door operation info (1-6) bpg
16 31514 8/25/17 Updated 195964 High/Low temp stage drawings bpg
15 41370 8/14/17 Updated BUS board information bpg
14 41159/41348 5/12/17 Corrected oerational temp range and D-volt rating bpg
14 41346/41347 5/12/17 Removed SS and AS400 model numbers bpg
Important installer and user information:
A redundant temperature sensing device has been included in this ULT freezer.
This device is a type “T” thermocouple. For convenient access, the thermocou-
ple (Figure 1-3) terminates in an interconnect jack (Figure 1-5) behind the base
front cover. (May be located differently in chests. See Section 1.) It is strongly
recommended that this thermocouple be attached to a redundant 24 hour 7
day monitoring system with alarm capabilities. Connecting the sensor to a
monitoring and alarm system separate from the freezer provides the utmost in
product safety, should the integral system fail. s
Part o. Description Quantity
122005 Key 2 (4 for DD)
380520 Neoprene Cap 2
510016 ¼-20 x 5-½” Bolt 2
195763 Retaining Clip 1
370563 Remote Alarm
Connector 1
Catalog o. Capacity
(cu ft) Voltage
902 13 230/50
903 13 120/60
909 13 208-230/60 Hz
904 17 120/60
905 17 230/50
910 17 208-230/60 Hz
906 23 230/50
956 23 120/60
957 23 208-230/60 Hz
907 28 230/50
908 28 208-230/60 Hz
Double Door (DD) Units
991 13 230/50
992 13 120/60
986 13 208-230/60 Hz
993 17 120/60
994 17 230/50
988 17 208-230/60 Hz
990 23 120/60
995 23 230/50
989 23 208-230/60 Hz
Models Covered

Thermo Scientificii Model 900 and 5900 Series
PrefacePreface
Important Read this instruction manual. Failure to read, understand and follow the instructions in this manual
may result in damage to the unit, injury to operating personnel, and poor equipment performance. s
Caution All internal adjustments and maintenance must be performed by qualified service personnel. s
Material in this manual is for information purposes only. The contents and the product it describes are subject
to change without notice. Thermo Fisher Scientific makes no representations or warranties with respect to this
manual. In no event shall Thermo be held liable for any damages, direct or incidental, arising out of or related to
the use of this manual.
The -86C Freezers (see page i for specific list of models) described in this manual are high performance units
which can be used for research and in situations that directly support medical applications. When these products
are used to support a medical application, it is an accessory to a medical device and is therefore considered as a
medical device in its own right by the regulatory body (e.g. FDA).
This product is intended for use:
• As cold storage in research use.
• As a medical device for diagnostic use (storage of samples not intended to be re-introduced to human body).
Registration: This medical application is considered a Class I medical device by the FDA. This product is
classified as product code – JRM, regulation number 862.2050 and is considered a Class 1 device, 510(K)
exempt.
©2014 Thermo Fisher Scientific. All rights reserved.
Contains Parts and Assemblies
Susceptible to Damage by
Electrostatic Discharge (ESD)
CAUTION

Thermo Scientific Model 900 and 5900 Series iii
Preface
Important operating and/or maintenance instructions. Read the accompanying text carefully.
Potential electrical hazards. Only qualified persons should perform procedures associated with this
symbol.
Equipment being maintained or serviced must be turned off and locked off to prevent possible injury.
Extreme temperature hazards, hot or cold. Use special handling equipment or wear special, protective
clothing.
WEEE Compliance: Thermo Fisher Scientific has contracted with companies for recycling/disposal in
each EU Member State. For further information, send an email to [email protected].
4Always use the proper protective equipment (clothing, gloves, goggles, etc.)
4Always dissipate extreme cold or heat and wear protective clothing.
4Always follow good hygiene practices.
4Each individual is responsible for his or her own safety.

Thermo Scientificiv Model 900 and 5900 Series
Preface
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Marietta, OH 45750
International customers, please contact your local Thermo Scientific distributor.

Model 900 and 5900 Series v
Thermo Scientific
Table of Contents
Installation and Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Control Panel Keys, Displays, Indicators . . . . . . . . . . . . . . . . . . . . . . 1-4
Operation of the Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Install Freezer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
Choose Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Door Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Install Wall umpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
Install Shelves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
RS-232 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Remote Alarm Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Attach Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Connect Unit to Electrical Power . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Run Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Freezer Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
Set Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
Set High Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Set Low Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10
Calibrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Calibrate Control Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
High Stage System Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Probe Failure Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Alarm Error Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Clean Cabinet Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Clean Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Clean Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Clean Water-cooled Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Prepare Unit for Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Long Term Storage with Water-cooled Condenser . . . . . . . . . . . . . 4-3
Defrost Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Section 1
Section 2
Section 3
Section 4

vi Model 900 and 5900 Series Thermo Scientific
Clean Door Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Vacuum Relief Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Check attery(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Replace attery(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Factory Installed Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
ack Up System ( US) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Install Vent Stack, Solenoid and Injection Assembly . . . . . . . . . . . .5-1
Install Temperature Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3
Connect Probe/Solenoid Harness . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
US Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Configure Optional US ( ack-Up System) . . . . . . . . . . . . . . . . . .5-7
Set Optional US Set Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Test US Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Clean Vent Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Disconnect Fitting Asm. and Transfer Hose . . . . . . . . . . . . . . . . . . . 5-9
Chart Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Installing the Chart Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Change Recorder Temperature Range . . . . . . . . . . . . . . . . . . . . . . .5-9
Recorder Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-10
Water-cooled Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-10
Water Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Five Inner Door Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Single Door Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Double Door Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 1
Refrigeration Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 - 1
Electrical Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 1
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 1
Handling Liquid itrogen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A - 1
Handling Liquid CO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B - 1
First Aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C - 1
Table of Contents
Section 5
Section 6
Section 8
Section 7
Section 9
Section 10
Appendix

Model 900 and 5900 Series 1-1Thermo Scientific
Section 1 Installation and Start-up
• Control panel - keypad, displays and indicators
• US (Optional ack Up System) control panel
• Optional temperature recorder or datalogger
Optional Back Up
System Controls
Temperature
Recorder
(Optional)
Control Panel
Figure 1-1. Freezer Front View Components

1-2 Model 900 and 5900 Series Thermo Scientific
Section 1
Installation and Start-Up
Optional Back-up
System Connections
RS-232 or RS-485
Interface
Power Switch
(mains disconnect)
Power Inlet
Wall Bumper
(pre-tapped holes)
Remote Alarm Contacts
Figure 1-2. Freezer Rear View Components
Shelf
Bracket
Sealant
(Caution: This is a critical seal.
Seal must be maintained.)
Optional - Recorder Probe/Datalogger Probe
Control RTD/Redundant Type T
Thermocouple Probe
Optional Miscellaneous Accessories Probe
Figure 1-3. Chamber Probe(s)
• Remote alarm contacts
• Power inlet for power cord connection
• Optional US connections for probe and solenoid
• RS-232 (default) or RS-485 interface
• Power switch (mains disconnect)

Model 900 and 5900 Series 1-3Thermo Scientific
Section 1
Installation and Start-Up
• Vacuum relief port - pressure equalization port
• Probe cover - houses control, optional recorder, datalogger, or optional
miscellaneous accessory probes
• attery mounting bracket(s)
• attery power switch (freezer and US)
• Freezer battery
• Optional US battery
• Freezer filter location
Vacuum Relief
Port
Chamber Probe
Cover
Figure 1-4. Vacuum Relief and Probe Cover Location
OO
Battery power
switch To
remove filter
Thermocouple
interconnect jack
Battery mounting
bracket
Freezer battery
and optional BUS battery
Figure 1-5. Battery(s) location and switch

• Temperature Display - Displays temperature in degrees Celsius.
• Mode Select Switch - Used to select Run, Set Temperature, Set High
Alarm, Set Low Alarm, Calibrate, ackup.
• Alarm Indicator - Light pulses on/off during an alarm condition of the
cabinet.
• Silence - Silences the audible alarm. See Section 4 for alarm ringback
times.
• Alarm Panel - indicates the current alarm condition.
• Up and Down Arrows - Increases or decreases values, toggles between
choices.
• Enter - Stores the value into memory
1-4 Model 900 and 5900 Series Thermo Scientific
Section 1
Installation and Start-Up
Temperature
Display
Mode
Key
Alarm
Indicator
Silence
Key
Alarm
Panel
Up and Down
Arrows
Enter Key
Figure 1-6. Control Panel
Control Panel Keys,
Displays, Indicators

The Model 900 Series freezer has five basic modes which allow freezer
setup and operation. Press the Mode key to scroll through the mode
selections.
Up Arrow: Increases or toggles the parameter value.
Enter: Must press Enter key to save to memory all
changed values.
Down Arrow: Decreases or toggles the parameter value.
Silence Key: Press to silence the audible alarm. See
Section 4 for alarm ringback times.
ote If tipped more than 45°, allow the unit to sit upright for 24 hours
before start up. s
To remove the freezer from the pallet, use a 1/2" wrench to remove all the
bolts securing the shipping bracket to the pallet.
Remove the shipping bracket. Remove the ramp boards from the pallet
and place the slotted end over the ramp brackets on the pallet. The
support blocks on the ramps will be facing down. efore moving the
freezer, make sure the casters are unlocked and moving freely. Align the
caster with the ramp boards. Use adequate personnel to roll the freezer off
the pallet.
The freezer can be easily pushed to the desired approved location,
described below. If necessary, the doors and lower front panel may be
opened to move the unit through tight openings. When the freezer is in
position, set the front caster brakes.
ote The freezer must not be moved with the product load inside. s
ote For proper ventilation and airflow, a minimum clearance of 5” at the
rear and top and a clearance of 8” on the side of the freezer is required.
Allow adequate space in the front of the freezer for door opening. s
Locate the freezer on a firm, level surface in an area with an ambient
temperature between 18°C and 32°C. Provide ample room to reach the
mains disconnect switch (power switch) located on the rear of the freezer.
Model 900 and 5900 Series 1-5Thermo Scientific
Section 1
Installation and Start-Up
Install Freezer
Choose Location
Operation of the
Keypad

Upright freezer models are equipped with an advanced assembly
specifically designed for ultra-low temperature freezers.
Features include:
One-hand operation•
A front-accessible lock•
Hasps for a standard padlock to provide additional security. Length of•
the shackle must be between ¾ inch (1.9 cm) and 1½ inch (3.8 cm).
Durable construction for reliable operation and safe product storage.•
The parts bag, located inside the cabinet, contains the following parts.
Install the bolts into the pre-tapped holes on the back of the compressor
section. Install a neoprene cap on each bolt. Refer to Figure 1-2 for the
locations of the pre-tapped holes.
Install the shelf clips into the shelf pilasters (front and back) at the desired
shelf level. Install the shelves in the cabinet onto the clips.
ote Maximum shelf load is 100 lbs (45.4 kg) per shelf. s
ote On units having the optional 5 inner door option, refer to the
instructions accompanying the inner door kit. s
The Model 900 Series freezer has a
data communications interface. The
factory default setting is RS-232.
The wiring identification for the
interface is shown in Figure 1-7. One
nine pin, sub "D" style connector is
located on the back of the freezer. See
Figure 1-2 for the location of the connector on the freezer.
The freezer transmits temperature information every 60 minutes. A
standard D 9 serial extension cable can be used to connect the freezer to a
serial device. Some serial devices may require a null modem adapter.
1-6 Model 900 and 5900 Series Thermo Scientific
Section 1
Installation and Start-Up
Install Shelves
RS-232 Communications
Quantity Stock # Description Purpose
2 510016 1/4-20 x 5-1/2” Bolt Wall Bumper
2 380520 Neoprene Cap Cap Protector
Table 1-1. Parts bag
Install Wall Bumpers
Figure 1-7. RS-232 Interface
Door Operation

Data format:
aud . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200
Data bits . . . . . . 8 (7 bit ASCII with leading zero)
Start bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Stop bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . none
The data transfer sequence is transmitted in the following format. X refers
to numerical temperature data.
(NUL) (-) XXX (SP) C (SP) (Error Message) (SP) (LF) (CR) (EOT) (SP)
In the event of a CNTRLFAIL, Er07, or the control probe is out of range
error, the numerical temperature data (XXX) in the transmission would be
replaced by T_ERR.
If no alarm condition exists, spaces will be sent. A total of 20 characters
will be sent.
SP - Space LF - Line feed
CR - Carriage return EOT - End of text (4)
NUL - Null character (00)
If an alarm condition does exist, “Error Message” in the protocol will be
replaced by the following:
UNDERTEMP (temperature above the low alarm setpoint)
OVERTEMP (temperature below the high alarm setpoint)
PWRFAIL (AC power failure)
CNTRLFAIL (Control probe failure)
Er07 (micro failure)
HSHX FAIL (Heat exchanger failure)
HOT COND (Hot condenser)
See Figure 1-2 for the location of the remote alarm contacts. The remote
alarm connector is located in the parts bag provided with the manual. It
must be installed if connecting the
freezer to an alarm system. After
installing the wiring from the alarm
system to the connector, install the
connector to the freezer microboard
and secure with the two screws
provided. The remote alarm provides a
NO (normally open) output, a NC
normally closed) output and COM
(common). The contacts will trip on a
Model 900 and 5900 Series 1-7
Thermo Scientific
Section 1
Installation and Start-Up
Remote Alarm Contacts
RS-232 Communications
(continued)
Figure 1-8. Remote Alarm Contacts
IIMMPPOORRTTAANNTTUUSSEERRIINNFFOORRMMAATTIIOONN
CAUTION! Stored product should be protected
by a redundant 24 hour/day monitoring system
with alarm capability. An interconnect jack and
thermocouple are installed for centralized
monitoring, should on-board system fail.

power outage and high temperature or low temperature alarms. They will
also trip on high stage, control probe or microboard failures.
Figure 1-8 shows the remote contacts in the alarm state.
Insert the power cord into the
power inlet module. Place the
retaining bracket (P/N 195763)
over the connector. Tighten
retaining screws to secure.
Caution See the serial tag on the side of the unit for electrical specifications
or refer to the electrical schematics in this manual. s
Caution If the factory installed option water-cooled condenser is present,
do not turn the freezer on without water connected and flowing. Damage
to t e refrigeration system could occur wit in 5 minutes if water is not
connected and flowing on unit start-up. Refer to Section 5. s
The freezer should be operated on a dedicated grounded service. Check the
voltage rating on the serial tag of the unit and compare it with the outlet
voltage. Then, with the power switch turned off, plug the line cord into
the wall outlet.
First, turn on the freezer power switch. Then open the lower front door by
grasping the bottom left corner. Locate the battery switch (Figure 1-5) and
turn it to Standby mode ( ). During initial freezer start-up, the system
battery may require charging and the Low attery indicator may
illuminate.
Caution Ensure the battery switch is turned to Standby mode ( ). The
rechargeable batteries require 36 hours to charge at initial start-up. A “Low
attery” alarm may occur until the batteries are fully charged. Should a
power failure occur during the initial start-up period, the electronics will
have limited operation. s
Run mode is the default mode for the freezer. This mode displays the
cabinet temperature on the temperature display under normal operating
conditions. In addition, the Run mode allows display of the high stage heat
exchange temperature.
1-8 Model 900 and 5900 Series Thermo Scientific
Section 1
Installation and Start-Up
Attach Power Cord
Connect Unit to Electrical
Power
Figure 1-9. Power Cord Connection
Run Mode
Remote Alarm Contacts
(cont)

This information scrolls by pressing the up or down arrow keys. The display
returns to the operating temperature in 10 seconds if no keys are pressed.
With the freezer properly installed and connected to power, system set
points can be entered. The following set points can be entered in Settings
mode: Control temperature, high temperature alarm set point, low
temperature alarm set point, and (optional) US set point. Default settings
are shown in the table below.
ote If the set point is changed and the low temp and high temp alarms are
set 10° from the set point, the alarm set points will be adjusted
automatically to maintain a distance of at least 10° from set point. s
Caution If the factory installed option water-cooled condenser is present, do
not turn the freezer on without water connected and flowing. Damage to
t e refrigeration system could occur wit in 5 minutes if water is not
connected and flowing on unit start-up. Refer to Section 5. s
Model 900 and 5900 Series freezers have an operating temperature range of
-50°C to -86°C, depending on ambient temperature. The freezer is shipped
from the factory with a temperature set point of -80°C. To change the
operating temperature set point:
1. Press the Mode key until the Set Temperature indicator lights.
2. Press the up/down arrow key until the desired temperature set point is
displayed.
3. Press Enter to save the set point.
4. Press the Mode key until the Run indicator lights for Run mode
If no keys are pressed, the freezer will automatically return to RUN mode
after 5 minutes.
ote If the set point is changed and the low temperature and high
temperature alarms are set 10° from the set point, the alarm set points will
be adjusted automatically to maintain a distance of at least 10° from set
point. s
Model 900 and 5900 Series 1-9Thermo Scientific
Section 1
Installation and Start-Up
Freezer Start-Up
Default Settings Temperature
Control Set Point -80°C
High Temperature Alarm -70°C
Low Temperature Alarm -90°C
Optional BUS Set Point -60°C
Table 1-2. Default Settings
Set Operating
Temperature
Run Mode (cont)

The high temperature alarm will activate an audible/visual warning when
the freezer chamber temperature has reached or exceeded the high
temperature alarm set point.
To set the high temperature alarm set point:
1. Press the Mode key until the Set High Alarm indicator lights.
2. Press the up or down arrow key until the desired high temperature
alarm set point is displayed.
3. Press Enter to save the setting.
4. Press the Mode key until the Run indicator lights for Run mode
If no control keys are pressed, the freezer will automatically return to RUN
mode after 5 minutes.
ote The high alarm set point must be set at least 5°C from the control
set point. s
ote At initial start-up, the high temperature alarm is disabled until the
cabinet reaches set point or 12 hours elapse. s
The low temperature alarm will activate an audible/visual warning when
the freezer chamber temperature has reached or decrease below the low
temperature alarm set point.
To set the low temperature alarm set point:
1. Press the Mode key until the Set Low Alarm indicator lights.
2. Press the up or down arrow key until the desired low temperature
alarm set point is displayed.
3. Press Enter to save the setting.
4. Press the Mode key until the Run indicator lights for Run mode
If no control keys are pressed, the freezer will automatically return to RUN
mode after 5 minutes.
ote The low alarm set point must be set at least 5°C from the control set
point. s
1-10 Model 900 and 5900 Series Thermo Scientific
Section 1
Installation and Start-Up
Set High Temperature
Alarm
Set Low Temperature
Alarm

Model 900 and 5900 Series 2-1Thermo Scientific
Section 2 Calibrate
Once the freezer has stabilized, the control probe may need to be
calibrated. Calibration frequency is dependent on use, ambient conditions
and accuracy required. A good laboratory practice would require at least an
annual calibration check. On new installations, all parameters should be
checked after the stabilization period.
Caution efore making any calibration or adjustments to the unit, it is
imperative that all reference instruments be properly calibrated. s
Plug a type T thermocouple reader into the receptacle located inside the
lower door (see Figure 1-5). Compare the control temperature set point to
the temperature of the measuring device.
1. Press the Mode key until the Calibrate indicator lights.
2. Press up/down arrow to match the display to calibrated instrument.
3. Press Enter to store calibration.
4. Press the Mode key to return to Run mode.
Startup - Allow 12 hours for the temperature in the cabinet to stabilize
before proceeding.
Already Operating - Allow at least 2 hours after the display reaches set
point for temperature to stabilize before proceeding.
During calibration, the temperature display will not be available. s
If no keys are pressed for approximately five minutes while in calibration
mode, the system will reset to Run mode.
Calibrate Control
Probe
Temperature Stabilization
Periods

Model 900 and 5900 Series 3-1Thermo Scientific
Section 3 Alarms
The Model 900 and 5900 Series freezer alarms are displayed on the freezer
control panel. When an alarm is active, the indicator next to the alarm
description will light and there will be an audible alarm. Press the Silence
key to disable the audible alarm for the ringback period. The visual alarm
will continue until the freezer returns to a normal condition. The alarms
are momentary alarms only. When an alarm condition occurs and then
returns to normal, the freezer automatically clears the alarm condition.
All alarm delays and ringback times are ±30 seconds.
* The automatic battery test runs immediately on power-up, then every 8 hours thereafter.
Description Delay Ringback Relay
Power Failure 1 min. 15 min. Yes
High Temperature Alarm 1 min. 15 min. Yes
Low Temperature Alarm 1 min. 15 min. Yes
Probe Failure see 3.2 1 min. 15 min. No
Door Open 1 min. 15 min. No
Wrong Power 0 min. none Yes
Low Battery* 1 min. 8 hours No
Low BUS Battery (optional) 1 min. 15 min. No
Hot Condenser 1 min. none No
High Stage Failure 0 min. 15 min. Yes
Micro Board Failure 0 min. 15 min. Yes
Table 3-1. Alarm Indicators

3-2 Model 900 and 5900 Series Thermo Scientific
Section 3
Alarms
The "high stage system failure" condition is created when the high stage
compressor and fans run for 30 minutes and are not capable of cooling the
interstage heat exchanger to the proper temperature. Under this condition,
the high stage compressor and fans will turn off after 30 minutes and an
audible and visual alarm will occur. The audible alarm can be silenced and
will ring back every 15 minutes.
The microprocessor in Model 900 and 5900 Series freezers continually
scans all probes including the control probe, heat exchanger probe and
condenser probe to ensure that they are operating properly. Should an
error be detected, the "Probe Failure" alarm will occur as described above.
If an error is detected with the control probe, the high and low stage
compressors will run continuously. As a result, the cabinet temperature
will decrease until it reaches the lowest temperature that the refrigeration
system can maintain. If an error is detected with the heat exchanger probe,
the freezer will cycle properly at its temperature set point using a 5 minute
step start between the high and low stage compressors. If an error is
detected with the condenser probe, there is no impact on the performance
of the freezer; however, the hot condenser alarm may also occur. Contact
the Technical Services department or your local distributor.
High Stage System
Failure
Probe Failure Alarm