NuAire NU-9483E User manual

NU-9483E
NU-9483GC
NU-9483GA
NU-9668E
NU-9668GC
Ultra-Low Temperature Freezer
INSTRUCTION MANUAL
NU-9483GA

1
CONTENTS
INTRODUCTION P. 2
PRECAUTIONS FOR SAFE OPERATION P. 3
ENVIRONMENTAL CONDITIONS P. 7
FREEZER COMPONENTS P. 8
Control panel P.10
INSTALLATION SITE P.11
INSTALLATION P.12
START-UP OF UNIT P.13
CHAMBER TEMPERATURE SETTING P.14
KEY LOCK FUNCTION P.14
ALARM TEMPERATURE SETTING P.15
SETTING OF ALARM RESUME TIME P.16
REMOTE ALARM TERMINAL P.17
CHANGE OF COMPRESSOR DELAY TIME P.18
ALARMS & SAFETY FUNCTIONS P.19
ROUTINE MAINTENANCE P.20
Cleaning of cabinet P.20
Cleaning of condenser filter P.20
Defrosting of inside wall P.21
Cleaning of air intake port P.21
TROUBLESHOOTING P.22
DISPOSAL OF UNIT P.23
Recycle of battery P.23
Decontamination of unit P.23
DISPOSAL OF BATTERY P.28
TEMPERATURE RECORDER (OPTION) P.29
Setting of MTR-G85A and MTR-G85C P.29
Installation of MTR-G85A and MTR-G85C P.30
BACKUP COOLING KIT (OPTION) P.31
INVENTORY RACK P.32
SPECIFICATIONS (NU-9483E/9483GC/9483GA) P.33
SPECIFICATIONS (NU-9668E/9668GC) P.34
PERFORMANCE P.35
SAFETY CHECK SHEET P.36

2
INTRODUCTION
Read this manual carefully before using the appliance and follow the instructions for safety operation.
Never guarantee any safety if the appliance is used for any objects other than intended use or used by
any procedures other than those mentioned in this manual.
Keep this manual in an adequate place to refer to it as necessary.
The contents of the manual will be subjected to change without notice due to the improvement of
performance or functions.
Contact our sales representative or agent if any page of the manual is lost or page order is incorrect.
Contact our sales representative or agent if any point in this manual is unclear or if there are any
inaccuracies.
No part of this manual may be reproduced in any form without the expressed written permission of
NUAIRE.

3
PRECAUTIONS FOR SAFE OPERATION
It is imperative that the user complies with this manual as it contains
important safety advice.
Items and procedures are described so that you can use this unit correctly and safely.
If the precautions advised are followed, this will prevent possible injury to the user and
any other person.
Precautions are illustrated in the following way:
WARNING
Failure to observe WARNING signs could result in a hazard to personnel
possibly resulting in serious injury or death.
CAUTION
Failure to observe CAUTION signs could result in injury to personnel and
damage to the unit and associated property.
Symbol shows;
this symbol means caution.
this symbol means an action is prohibited.
this symbol means an instruction must be followed.
Be sure to keep this manual in a place accessible to users of this unit.
Some warning and/or caution labels are attached on the unit. Following shows the description of such
labels.
This label is on the cover in which the electrical components of high voltage are enclosed
to prevent the electric shock. The cover should be removed by a qualified engineer or a
service personnel only.
This symbol means attention or refer to document.
This symbol means earth.
This symbol means power switch “ON”.
This symbol means power switch “OFF”.
WARNING
As with any equipment that uses CO
2
gas, there is a likelihood of oxygen depletion in the
vicinity of the equipment. It is important that you assess the work site to ensure there is
suitable and sufficient ventilation. If restricted ventilation is suspected, then other methods of
ensuring a safe environment must be considered. These may include atmosphere monitoring
and warning devices.

4
PRECAUTIONS FOR SAFE OPERATION
Do not use the unit outdoors. Current leakage or electric shock may result if the unit is exposed to
rain water.
Only qualified engineers or service personnel should install the unit. The installation by
unqualified personnel may cause electric shock or fire.
Install the unit on a sturdy floor and take an adequate precaution to prevent the unit from
turning over.
If the floor is not strong enough or the installation site is not adequate, this may result
in injury from the unit falling or tipping over.
Never install the unit in a humid place or a place where it is likely to be splashed by water.
Deterioration of the insulation may result which could cause current leakage or electric shock.
Never install the unit in a flammable or volatile location.
This may cause explosion or fire.
Never install the unit where acid or corrosive gases are present as current leakage or electric
shock may result due to corrosion.
Always ground (earth) the unit to prevent electric shock. If the power supply outlet is not
grounded, it will be necessary to install a ground by qualified engineers.
Never ground the unit through a gas pipe, water main, telephone line or lightning rod. Such
grounding may cause electric shock in the case of an incomplete circuit.
Connect the unit to a power source as indicated on the rating label attached to the unit. Use of
any other voltage or frequency other than that on the rating label may cause fire or electric shock.
Never store volatile or flammable substances in this unit if the container cannot be sealed. These
may cause explosion or fire.
Do not insert metal objects such as a pin or a wire into any vent, gap or any outlet on the unit.
This may cause electric shock or injury by accidental contact with moving parts.
Use this unit in safe area when treating the poison, harmful or radiate articles. Improper use
may cause bad effect on your health or environment.
Turn off the power switch (if provided) and disconnect the power supply to the unit prior to any
repair or maintenance
of the unit in order to prevent electric shock or injury.
Do not touch any electrical parts (such as power supply plug) or operate switches with a wet
hand.
This may cause electric shock.
WARNING

5
PRECAUTIONS FOR SAFE OPERATION
Ensure you do not inhale or consume medication or aerosols from around the unit at the time of
maintenance. These may be harmful to your health.
Never splash water directly onto the unit as this may cause electric shock or short circuit.
Never put containers with liquid on the unit as this may cause electric shock or short circuit when
the liquid is spilled.
Never bind, process, or step on the power supply cord, or never damage or break the power
supply plug.
A broken supply cord or plug may cause fire or electric shock.
Do not use the supply cord if its plug is loose.
Such supply cord may cause fire or electric shock.
Never disassemble, repair, or modify the unit yourself.
Any such work carried out by an
unauthorized person may result in fire, or electric shock or injury due to a malfunction.
Disconnect the power supply plug if there is something wrong with the unit. Continued
abnormal operation may cause electric shock or fire.
When removing the plug from the power supply outlet, grip the power supply plug, not the cord.
Pulling the cord may result in electric shock or fire by short circuit.
Disconnect the power supply plug before moving the unit. Take care not to damage the power
cord. A damaged cord may cause electric shock or fire.
Disconnect the power plug when the unit is not used for long periods. Keeping the connection
may cause electric shock, current leakage, or fire due to the deterioration of insulation.
If the unit is to be stored unused in an unsupervised area for an extended period, ensure that
children do not have access and that doors cannot be closed completely.
The disposal of the unit should be accomplished by appropriate personnel. Remove doors to
prevent accidents such as suffocation.
Do not put the packing plastic bag within reach of children as suffocation may result.
WARNING

6
PRECAUTIONS FOR SAFE OPERATION
Use a dedicated power source (a dedicated circuit with a breaker) as indicated on the rating label
attached to the unit. A branched circuit may cause fire resulting from abnormal heating.
Connect the power supply plug to the power source firmly after removing the dust on the plug.
A dusty plug or improper insertion may cause a heat or ignition.
Never store corrosive substances such as acid or alkali in this unit if the container cannot be
sealed. These may cause corrosion of inner components or electric parts.
Check the setting when starting up of operation after power failure or turning off of power
switch.
The stored items may be damaged due to the change of setting.
Be careful not to tip over the unit
during movement to prevent damage or injury.
Prepare a safety check sheet
when you request any repair or maintenance for the safety of service
personnel.
CAUTION

7
ENVIRONMENTAL CONDITIONS
This equipment is designed to be safe at least under the following conditions (based on the IEC 61010-1):
Indoor use;
Altitude up to 2000 m;
Ambient temperature 5
o
C to 40
o
C
Maximum relative humidity 80% for temperature up to 31
o
C decreasing linearly to 50% relative humidity
at 40
o
C;
Mains supply voltage fluctuations not to exceed ± 10% of the nominal voltage;
Transient overvoltages up to the levels of OVERVOLTAGE CATEGORY II;
Temporary OVERVOLTAGES occurring on the mains supply;
Applicable pollution degree of the intended environment (POLUTION DEGREE 2 in most cases)
EC Regulation No. 842/2006 on Certain Fluorinated Greenhouse Gases
Do not vent R-404A, R508B into the atmosphere:
These are fluorinated greenhouse gases, covered by the KYOTO PROTOCOL, With global warning
potential (GWP) = 3920, 11950.

8
16
17
18
19
FREEZER COMPONENTS
14
2
3
5 4
9
1
NU-9668E
6
7
8
11
10
15
12
14
13

9
FREEZER COMPONENTS
1. Outer door: To open the door, grip the handle. On closing, lock two door latches completely.
2. Control panel: Temperature set key, buzzer key and alarm lamp etc. are installed on the panel.
Digital temperature display is also provided on it. See page 10 “Control panel”.
3. Condenser filter (behind the grille):
This filter prevents the dust from accumulating on the
condenser. The dusty filter may cause failure of refrigerating device. Clean the filter once a month.
See page 20 “Routine maintenance” for the cleaning.
4. Space for temperature recorder: A temperature recorder (optional part) can be attached here. See
page 29 “Temperature recorder (OPTION)”.
5. Key hole: Turn counterclockwise to 180 degree and the outside door can be securely locked.
6. Leveling foot: 2 feet are provided on the front side (right and left). Keep the unit in level by
adjusting these feet at the installation.
7. Caster:
4 casters are provided to facilitate moving of the cabinet.
8. Air intake port: After closing the outer door, if used to open soon. See page 17
9. Door latch:
Always lock the latches when the outer door is closed.
10. Magnetic door gasket: This provides a tight door seal and prevents cold air leak. Keep clean.
11. Inner door latch: Always lock the inner door latch when the inner door is closed.
12. Inner door: Composed of separated door flaps for minimizing temperature rise when putting in and
taking out refrigerated articles. Lock the door latch completely when the door is closed. The door is
removable for cleaning or defrosting. See page 21 “Routine maintenance”.
13. Shelf: Use to store the materials in the freezer. It is recommended to store the items on the shelf.
The maximum load is 50 kg.
Note: Never touch the storage items with wet hands. Touching with the wet hands may cause frostbite.
Take care when handling shelves, as you may be injured if shelves drop on your leg.
14. Setting spot for temperature sensor:
The sensor of temperature controller is set at this spot. Be
careful not to contact any refrigerated articles directly with the spot.
15. Access port:
This is used for leading the measuring cable from the freezing chamber to the outside.
16. Remote alarm terminal: This is used to notice an alarm condition of the unit to remote location.
Refer to page 17 “Remote alarm terminal”.
17. Battery switch: This is a switch for a battery for power failure alarm. Normally, turn on this switch.
Be sure to turn off this switch if the freezer is not in operating for the long period (over one month).
18. Power switch: This is for turning ON/OFF the power to the unit. ON – “I” OFF – “ ○ ”
19. Fuse: AC 250 V, 5 A is attached.