Thermo Scientific Revco ULT1790-10-A User manual

Thermo Scientific
Revco®CxF -40C and -86C Chest Freezers
perating Manual 7045808 Rev. 7
Visit us online to register your warranty
www.thermoscientific.com/labwarranty

Thermo Scientific
MANUAL NUMBER 7045808
7 40543/41159 5/17/17 Added -gas statement, Corrected D-volt rating
7 41347/41348 5/17/17 Removed AS400 model numbers, ixed operational temp range bpg
6 40473/ R-2854 6/14/16 Updated start component encl dwg, electrical schematics - Zettler relay ccs
5 40497/ R-2843 5/12/16 Updated refrigeration and electrical schematics - Schurter switch ccs
4 40544 12/9/15 BUS information (preventive maintenance and BUS control panel and operation) ccs
3 40286/ R-2805 7/1/15 New start relay - expl enclosure drawing and 8702 & 8722 elec schematics ccs
Preface
Revco Cx i
-86C Models Covered
Catalog Number Cu. ft. Voltage
ULT-390-10-A 3 120/60
ULT-390-10-V 3 230/50
ULT-1390-10-A 12.7 120/60
ULT-1390-10-V 12.7 230/50
ULT1390-10-D 12.7 208-230/60
ULT-1790-10-A 17 120/60
ULT-1790-10-V 17 230/50
ULT-1790-10-D 17 208-230/60
ULT-2090-10-A 20 120/60
ULT-2090-10-V 20 230/50
ULT-2090-10-D 20 208-230/60
Part No. Description Qty
213 Key 2
380520 Neoprene Cap 2
510016 1/4-20 x 5-1/2” Bolt 2
195763 Retaining Clip 1
370563 Remote Alarm Connector 1
Packing List
-40C Models Covered
Catalog Number Cu. ft. Voltage
ULT350-10-A 3 120/60
ULT350-10-V 3 230/50
ULT1350-10-V 12.7 230/50
ULT1350-10-A 12.7 120/60
ULT1350-10-D 12.7 208-230/60
ULT1750-10-A 17 120/60
ULT1750-10-D 17 208-230/60
ULT1750-10-V 17 230/50
ULT2050-10-A 20 120/60
ULT2050-10-D 20 208-230/60
ULT2050-10-V 20 230/50
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 thermocouple (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 integral system fail. s

Thermo Scientificii Revco Cx
Preface
Contains Parts and Assemblies
Susceptible to Damage by
Electrostatic Discharge (ESD)
CAUTION
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 -40C and -86C freezers (see page i for model numbers) 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 therefor 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 the human
body).
Registration: This medical application is considered a Class I device by the FDA. This product is classified as
product code - JRM, regulation number 862.2050 and is considered a Class I device, 510(K) exempt.
© 2013 Thermo Fisher Scientific. All rights reserved.

Revco Cx iiiThermo Scientific
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.
quipment being maintained or serviced must be turned off and locked off to prevent possible injury.
xtreme temperature hazards, hot or cold. Use special handling equipment or wear special, protective
clothing.
W Compliance: Thermo Fisher Scientific has contracted with companies for recycling/disposal in
each U 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.
4ach individual is responsible for his or her own safety.

Thermo Scientificiv Revco Cx
Preface
Do You Need Information or Assistance on
Thermo Scientific Products?
If you do, please contact us 8:00 a.m. to 6:00 p.m. (Eastern Time) at:
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Our staff can provide information on pricing and give you quotations. We canSales Support
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technicians or a qualified service organization for on-the-spot repair. If your service need is
covered by the warranty, we will arrange for the unit to be repaired at our expense and to your
satisfaction.
Regardless of your needs, our professional telephone technicians are available to assist you
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telephone or fax. If you wish to write, our mailing address is:
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Marietta, OH 45750
International customers, please contact your local Thermo Scientific distributor.

Revco Cx vThermo Scientific
Table of Contents
Installation and Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Control Panel Keys, Display, Indicators . . . . . . . . . . . . . . . . . . . . . . .1-5
Install Freezer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7
Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
RS-232 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Install Wall Bumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8
Choose Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Remote Alarm Contacts and Analog Output . . . . . . . . . . . . . . . . . 1-9
Connect Unit to lectrical Power . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Attach Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Freezer Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11
Set Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11
Set Low Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Set High Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Access Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Run Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Calibrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Calibrate Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Calibrate Control Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Low Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
High Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
BUS Battery Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
System Battery Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Set Access Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Clear High Stage Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Display Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Back Up System Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
RS485 Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Reset xcursion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Warm xcursion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Cold xcursion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Section 1
Section 2
Section 3

vi Revco Cx Thermo Scientific
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Lost Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Micro Board Failure Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Multiple Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
High Stage System Failure Alarm . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Clean Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Clean Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Defrost Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Prepare Unit for Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Clean Lid Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Replace Battery(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Check Battery(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
PR V NTIV MAINT NANC . . . . . . . . . . . . . . . . . . . . . . . . .5-5
Factory Installed ptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Back Up System (BUS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Install Injection Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Install Temperature Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
BUS Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Connect Probe/Solenoid Harness . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Set Optional BUS Set Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Configure Optional Back Up System (BUS) . . . . . . . . . . . . . . . . . .6-5
Test the BUS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Disconnect Fitting Assembly, Transfer Hose . . . . . . . . . . . . . . . . . 6-6
Chart Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Calibrate Chart Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Change Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Install Chart Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Handling Liquid Nitrogen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A -1
Handling Liquid C 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A -4
First Aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C - 1
Table of Contents
Section 4
Section 5
Section 6
Section 7
Section 8
Appendix

Revco Cx 1-1Thermo Scientific
Section 1 Installation and Start-up
Figures 1-1 and 1-2 show the front view of the freezer and indicate the
following freezer components:
• Control Panel - keypad, displays and indicators.
• BUS (Optional Back Up System) panel.
• Optional temperature recorder (7 day, one pen) or datalogger.
• Keylock - keyed lid lock.
Optional Back Up
System Controls
Control Panel
Optional
Datalogger
or Recorder
Key lock
Figure 1-1. ront View 3 cu ft Models
EnviroScan
Control
Optional
BUS Control
Keylock
Optional Recorder
or Datalogger
Figure 1-2. ront View Remaining Models

1-2 Revco Cx Thermo Scientific
Section 1
Installation and Start-up
Figures 1-3 and 1-4 display the rear view of the freezer and indicate the
following freezer components:
• Remote alarm contacts and selectable analog output connection - 0-
1V, 4-20mA (default), 0-5V).
• Power inlet for power cord connection.
• Optional BUS connections for probe and solenoid.
• RS-232 or RS-485 interface.
• Power Switch (mains disconnect).
Optional BUS battery
(just behind this panel)
Optional
BUS Connections
RS-232 or RS-485
Interface
Remote Alarm Contacts
and Analog Output
Power Switch
(mains disconnect)
Power Inlet
Threaded holes for
wall bumpers
Access Port
Figure 1-3. Rear View 3 cu ft Models
Threaded holes for
wall bumpers
Remote Alarm Contacts
and Analog Output
Optional
BUS Connections
Power Inlet
Power Switch
(mains disconnect)
RS-232 or RS-485
Interface
Figure 1-4. Rear View Remaining Models
Access Port

Revco Cx 1-3Thermo Scientific
Section 1
Installation and Start-up
The probe cover houses the control, optional recorder, datalogger, Model
1535 alarm, or BUS probes.
Figures 1-6, 1-7, and 1-8 indicate the following components:
• Freezer filter location
• Battery power switch (freezer and BUS)
• Thermocouple receptacle
• Battery mounting bracket
• Freezer and optional BUS battery
Figure 1-5. Probe Cover
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To remove
filter
Thermocouple
interconnect jack
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Battery
Switch
Condenser
Figure 1-6. All Models Except 3 cu ft

1-4 Revco Cx Thermo Scientific
Section 1
Installation and Start-up
micro
board
battery
bracket
battery
switch
probe
access
port
Figure 1-7. reezer Left Side - Sidecar panel removed
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System
battery
Battery
switch
Thermocouple
interconnect jack
To
remove filter
Figure 1-8. 3 cu ft Models

Mode Select Switch - Used to select Run, Settings, Calibrate and System
Configuration Modes.
Mode Select Indicators -
Run: Run Menu
Settings: Set Points Menu
Calibrate: Calibrate Menu
Configuration: Configuration Menu
Temperature Display - Displays temperature in degrees Celsius.
Alarm Indicator - Light pulses on/off during an alarm condition.
Silence - Mutes the audible alarm.
Low Battery - indicates a low battery condition of the freezer battery.
Hot Condenser - indicates a hot condenser condition.
Message Center - displays system status and alarms.
Scroll for Parameters Arrows - moves through the choices of the selected
mode.
Up and Down Arrows - Increases or decreases values, toggles between
choices.
nter - Stores the value into computer memory.
Revco Cx 1-5Thermo Scientific
Section 1
Installation and Start-up
Figure 1-9. Control Panel Keys, Display and Indicators
Control Panel Keys,
Display, Indicators
Temp Display
Message Center
Visual Alarm Display
Up and Down
Arrow Keys
Scroll for Parameters
Arrows

Revco CxF freezers have four basic modes which allow freezer setup: Run,
Settings, Calibrate and Configuration.
Run is the default mode which the freezer will normally be in during
operation.
Settings is used to enter system set points for freezer operation.
Calibrate is used to calibrate various system parameters.
Configuration allows for custom setup of various options.
The chart below shows the selections under each of the modes.
1-6 Revco Cx Thermo Scientific
Section 1
Installation and Start-up
Table 1-1. Modes of Operation
Panel Keys, Display,
Indicators (cont.)
Run Settings Calibrate Configuration
Default Mode
System Ok Control Set Point Control Probe High Alarm Test
Line Voltage High Alarm Set Point Optional Sample
Probe Low Alarm Test
Compensated Voltage Low Alarm Set Point System Battery Test
* HSHX Temperature Optional Back Up
System Set Point BUS Battery Test
Display Temperature
* Clear High Stage
Alarm
Set Access Code
RS485 Address
BUS type CO2 or LN2
Cold Excursion
Warm Excursion
Reset Excursion
* -86C units only

S roll for Parameters Arrows: Steps the operator through the parameters
of Settings, Calibrate and Configuration Modes. The right arrow goes
to the next parameter, the left arrow returns to the previous parameter.
Up Arrow: Increases or toggles the parameter value that has been selected
in the Settings, Calibrate, and Configuration Modes.
Enter: Must press nter key to save to memory all changed values.
Down Arrow: Decreases or toggles the parameter values that have been
selected in the Settings, Calibrate, and Configuration Modes.
Silen e Key: Press to mute the audible alarm. See Section 4 for alarm
ringback times.
Message Center: Displays the system status (Mode) at all times. Displays
SYST M OK during normal operation, or alarm messages if the system
detects an alarm condition. See Section 4 - Alarms.
There are two displays on the control panel. The temperature display
shows the temperature in degrees Celsius. The message center displays the
system status (Mode) at all times. The message SYST M OK displays
during normal operation. Alarm messages are displayed if the system
detects an alarm condition. See Section 4 - Alarms.
To remove the freezer from the pallet, use a 7/16" wrench to remove all
the bolts securing the shipping bracket to the pallet.
Note If tipped more than 45°, allow the unit to set upright for 24 hours
before start up. s
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. Before 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, as
described previously. When the freezer is in position, set the front caster
brakes.
Note Do not move the freezer with the product load inside. s
Revco Cx 1-7Thermo Scientific
Section 1
Installation and Start-up
Displays
Install Freezer
Panel Keys, Display,
Indicators (cont.)

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.
Note For proper ventilation and airflow, a minimum clearance of 5” at the
rear and front and a clearance of 8” on the side of the freezer is required.
Allow adequate space for lid opening. If ambient increases above 36°C,
clearance at the rear of the cabinet must be increased to 8”. s
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.
Revco CxF freezers have a data communications interface. The factory
default setting is RS-232.
The wiring identification for the interface is
shown in Figure 1-10. 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 DB9 serial extension cable can be used to connect the freezer to a
serial device. Some serial devices may require a null modem adapter.
Data format:
Baud . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200
Data bits . . . . . . 8 (7 bit ASCII with leading zero)
Start bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Stop bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . none
1-8 Revco Cx Thermo Scientific
Section 1
Installation and Start-up
Quantity Stock # Description Purpose
2 510016 1/4-20 x 5-1/2” Bolt Wall Bumper
2 380520 Neoprene Cap Cap Protector
Choose Location
Install Wall Bumpers
RS-232 Communications
Figure 1-10. RS-232 Interface

The data transfer sequence is transmitted in the following format. X refers
to numerical temperature data.
(NUL) (-) XXX (SP) C (SP) ( rror Message) (SP) (LF) (CR) ( OT) (SP)
In the event of a CNTRLFAIL, r07, or the control probe is out of range
error, the numerical temperature data (XXX) in the transmission would be
replaced by T_ RR.
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 OT - nd of text (4)
NUL - Null character (00)
If an alarm condition does exist, “ rror Message” in the protocol will be
replaced by the following:
UND RT MP (temperature above the low alarm setpoint)
OV RT MP (temperature below the high alarm setpoint)
PWRFAIL (AC power failure)
CNTRLFAIL (Control probe failure)
r07 (micro failure)
* HSHX FAIL (Heat exchanger failure)
HOT COND (Hot condenser)
Note The RS-232 is not compatible with Model 1535 Monitor/Alarm
System. s
* -86C units only
Revco CxF freezers have remote
alarm contacts and analog output.
See Figures 1-3 and 1-4 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 power
outage, high temperature alarm or low temperature alarm. They will also
trip on high stage (-86C units only), control probe and microboard
failures. Figure 1-11 shows the remote contacts in alarm state.
Revco Cx 1-9Thermo Scientific
Section 1
Installation and Start-up
Remote Alarm Contacts
and Analog utput
Figure 1-11. Remote Alarm Contacts
RS-232 Communications
(continued)

The analog output function allows the
freezer to output signals representing
the temperature of the freezer cabinet.
The factory default setting is 4-20 mA.
Refer to Table 1-2 for output
specifications.
Insert the power cord into the power inlet module. Place the retaining
bracket (P/N 195763) over the connector. Tighten retaining screws to
secure.
Note See the serial tag on the side of the unit for electrical specifications or
refer to the electrical schematics in this manual. 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 1-4) and
turn it to Standby mode ( ). During initial freezer start-up, the system
battery may require charging and the Low Battery message may appear in
the message center.
Note nsure the battery switch is turned to Standby mode ( ). The
rechargeable batteries require 36 hours to charge at initial start-up. A “Low
Battery” 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
1-10 Revco Cx Thermo Scientific
Section 1
Installation and Start-up
Remote Alarm Contacts
and Analog utput (cont.)
Attach Power Cord
4-20 mA 0-1V 0-5V
Temperature -100 to +50°C -100 to +50°C -100 to +50°C
Table 1-2. Analog Output Specifications
Connect Unit to Electrical
Power
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.
Figure 1-12. Power Cord Attachment

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) BUS set point. Default
settings are shown in the table below. See Chart 1-1 for more detail.
Note 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
The freezer has an operating temperature range of -50°C to -86°C (-86C
units) or -10°C to -40°C (-40C units), depending on ambient
temperature. The freezer is shipped from the factory with a temperature
set point of -80°C (-86C units) or -40° (-40C units). To change the
operating temperature set point:
1. Press the Mode key until the Settings indicator lights.
2. Press the right arrow until “S T PT = -XX” is displayed in the message
center.
3. Press the up/down arrow key until the desired temperature set point is
displayed.
4. Press nter to save the set point.
5. Press the Mode key until the Run indicator lights for Run mode or
press the right/left arrow keys to go to next/previous parameter.
If no control keys are pressed, the freezer will automatically return to RUN
mode after 5 minutes.
Revco Cx 1-11Thermo Scientific
Section 1
Installation and Start-up
Freezer Start-Up
-86C Units
Control Set Point -80°C
High Temperature Alarm -70°C
Low temperature alarm -90°C
Optional BUS Set Point -60°C
-40C Units
Control Set Point -40°C
High Temperature Alarm -30°C
Low temperature alarm -50°C
Optional BUS Set Point -30°C
Set perating
Temperature

The high temperature alarm activates an audible/visual warning when the
freezer chamber temp reaches or exceeds the high temp alarm set point.
To set the high temperature alarm set point:
1. Press the Mode key until the Set indicator lights.
2. Press right arrow until “HI ALM = -XX” displays in message center.
3. Press the up or down arrow key until the desired high temperature
alarm set point is displayed.
4. Press nter to save the setting.
5. Press the Mode key until the Run indicator lights or press the right or
left arrow to go to the next or previous parameter.
If no control keys are pressed, the freezer will automatically return to RUN
mode after 5 minutes.
Note The high alarm set point must be set at least 5°C from the control
set point. s
Note 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 activates an audible/visual warning when the
freezer chamber temp reaches or decreases below low temp alarm set point.
To set the low temperature alarm set point:
1. Press the Mode key until the Settings indicator lights.
2. Press right arrow until “LO ALM = -XX” displays in message center.
3. Press the up or down arrow key until the desired low temperature
alarm set point is displayed.
4. Press nter to save the setting.
5. Press the Mode key until the Run indicator lights or press the right or
left arrow to go to the next or previous parameter.
If no control keys are pressed, the freezer will automatically return to RUN
mode after 5 minutes.
Note The low alarm set point must be set at least 5°C from the control set
point. s
1-12 Revco Cx Thermo Scientific
Section 1
Installation and Start-up
Set High Temperature
Alarm
Set Low Temperature
Alarm

An access code can be set to prevent unauthorized change of settings in
Calibrate, Configuration and Settings mode. (An access code of 000 is
required to make changes.) If the access code is not at the default 000, you
can not leave RUN mode without entering a code. See Section 3,
Configuration for instructions on modifying the access code.
Run mode is the default mode for the freezer. The run mode displays the
cabinet temperature on the temperature display and ‘SYST M OK’ on the
message center under normal operating conditions. In addition, the Run
mode allows display of the following information:
LIN VOLTAG
COMP NSAT D VOLTAG
* HSHX T MP RATUR (heat exchanger temperature); -86C units
only
This information is scrolled individually by pressing the right arrow key.
In each case, the message center returns to SYST M OK in 10 seconds if
no keys are pressed.
Revco Cx 1-13Thermo Scientific
Section 1
Installation and Start-up
Access Code
Run Mode