NuAire NU-9728GA Instruction Manual
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NuAire NU-9728GA Instruction Manual

Ultra-low temperature freezer
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NU-9728GA
INSTRUCTION MANUAL
Ultra-Low Temperature Freezer

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  • Page 1 NU-9728GA INSTRUCTION MANUAL Ultra-Low Temperature Freezer...

  • Page 2: Table Of Contents

    CONTENTS INTRODUCTION P. 2 PRECAUTIONS FOR SAFE OPERATION P. 3 ENVIRONMENTAL CONDITIONS P. 7 FREEZER COMPONENTS P. 8 Control panel P.10 REMOTE ALARM TERMINAL P. 11 AIR INTAKE PORT P. 11 INSTALLATION SITE P. 12 INSTALLATION P. 13 START-UP OF UNIT P.

  • Page 3: Introduction

    Contact our sales representative or agent if any point in this instruction manuals is unclear or if there are any inaccuracies. No part of this instruction manuals may be reproduced in any form without the expressed written permission of NUAIRE.

  • Page 4: Precautions For Safe Operation

    PRECAUTIONS FOR SAFE OPERATION It is imperative that the user complies with this instruction manuals 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.
  • Page 5 PRECAUTIONS FOR SAFE OPERATION WARNING 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.
  • Page 6 PRECAUTIONS FOR SAFE OPERATION WARNING 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.
  • Page 7 PRECAUTIONS FOR SAFE OPERATION CAUTION This unit must be plug into a dedicated circuit protected by branch circuit breaker. Use a dedicated power source as indicated on the rating label attached to the unit. A multiple-tap may cause fire resulting from abnormal heating. Connect the power supply plug to the power source firmly after removing the dust on the plug.

  • Page 8: Environmental Conditions

    ENVIRONMENTAL CONDITIONS This equipment is designed to be safe at least under the following conditions (based on the IEC61010-1): Indoor use; Altitude up to 2000 m; Ambient temperature 5 C to 40 Maximum relative humidity 80% for temperature up to 31 C decreasing linearly to 50% relative humidity at 40 Mains supply voltage fluctuations up to ±10% of the nominal voltage;...

  • Page 9: Freezer Components

    FREEZER COMPONENTS 11(inside) Power cord Rear side...
  • Page 10 FREEZER COMPONENTS 1. Control panel (on the upper front of the outer door): Used for temperature setting and indication of operating status is displayed on the panel. See page 10 for details. 2. Outer door: To open the door, grip the handle. On closing, lock the outer door latch completely. 3.

  • Page 11: Control Panel

    FREEZER COMPONENTS Control panel 1. Digital temperature indicator: This indicator shows the present chamber temperature or set temperature. 2. Status monitor lamp (STATUS): This lamp lights when environmental condition or status gets worse or the unit is out of normal operation. 3.

  • Page 12: Remote Alarm Terminal

    REMOTE ALARM TERMINAL The terminal of the remote alarm is installed at the lower left side of the unit. The alarm is outputted from this terminal. Contact capacity is DC 30 V, 2 A. Contact output: between COM. and N.O. between COM.

  • Page 13: Installation Site

    INSTALLATION SITE To operate this unit properly and to obtain maximum performance, install the unit in a location with the following conditions: A location not subjected to direct sunlight Do not install the unit under direct sunlight. Installation in a location subjected to direct sunlight cannot obtain the intended performance.

  • Page 14: Installation

    INSTALLATION 1. Removing the packaging materials and tapes Remove all transportation packaging materials and tapes. Open the doors and ventilate the unit. If the outside panels are dirty, clean them with a diluted neutral dishwashing detergent. (Undiluted detergent can damage the plastic components. For the dilution, refer to the instruction of the detergent.) After the cleaning with the diluted detergent, always wipe it off with a wet cloth.

  • Page 15: Start-Up Of Unit

    START-UP OF UNIT Follow the procedures for the initial and consequent operations of the unit. 1. Turn off the switch of the .backup cooling kit (optional component) if it is installed. 2. Connect the power supply cord to the dedicated outlet having appropriate rating with the chamber empty, and turn on the power switch on the freezer.

  • Page 16: Chamber Temperature Setting

    CHAMBER TEMPERATURE SETTING Table 1 shows the basic procedure for setting the chamber temperature. Perform key operations in the sequence indicated in the table. The example in the table is based on the assumption that the desired temperature is -75 Note: The unit is set at the factory that the chamber temperature -80 Table 1.

  • Page 17: Alarm Temperature Setting

    ALARM TEMPERATURE SETTING This unit is provided with the high and low temperature alarm and the temperature at which the alarm is activated is changeable. The following procedure shows the setting of alarm temperature according to the condition below: High temperature alarm: activates at the temperature 5 C higher than the set temperature Low temperature alarm: activates at the temperature 5 C lower than the set temperature...

  • Page 18: Setting Of Alarm Resume Time

    SETTING OF ALARM RESUME TIME The alarm buzzer is silenced by pressing alarm buzzer stop key (BUZZER) on the control panel during alarm condition. (A remote alarm is continuing the operation.). The buzzer will be activated again after certain suspension if the alarm condition is continued. The suspension time can be set by following the procedure shown in the Table 5 below.

  • Page 19: Setting Of Compressor Delay Time

    SETTING OF COMPRESSOR DELAY TIME The delay time of high and low stage side compressor can be changed to reduce the load on the power line and to facilitate the start-up (reset) of the freezer after power failure. The example in the table 6 is based on the assumption that the delay time is changed to 4 minutes. (The delay time is set in 3 minutes at the factory.) Note: •...

  • Page 20: Setting Of Door Alarm Delay Time

    SETTING OF DOOR ALARM DELAY TIME The buzzer of door alarm is activated with 2 minutes delay when the outer door is open. The delay time is changeable. Follow the procedure in table 7 below to change the setting of delay time. The procedure assumes that the delay time is changed from 2 minutes to 3 minutes.

  • Page 21: Monitor Of Freezer Status

    MONITOR OF FREEZER STATUS The freezer has a function to monitor the running status of the unit as shown in table 8 below. This is to notice the running status getting worse (not failure). 1. The status monitor lamp is lit when one of the running status shown in table 6 is detected. 2.

  • Page 22: Alarms & Safety Functions

    Contact NUAIRE sales representative or agent at the time of replacement of the battery. • Fan motors are expendable supplies. Replace them for about every 6 years. Contact NUAIRE sales representative or agent at the time of replacement of the fan motors.

  • Page 23: Routine Maintenance

    ROUTINE MAINTENANCE WARNING Always disconnect the power supply to the unit prior to any repair or maintenance of the unit in order to prevent electric shock or injury. Ensure you do not inhale or consume medication or aerosols from around the unit at the time of maintenance.

  • Page 24: Defrosting Of Inside Wall

    ROUTINE MAINTENANCE Defrosting of inside wall The frost is built at the upper portion of the chamber and inner door. The excessive frost possibly make some gap between the cabinet and magnetic door gasket, which may cause poor cooling. Remove the frost on the inner door with a scraper enclosed with the unit.

  • Page 25: Cleaning Of Air Intake Port

    ROUTINE MAINTENANCE Cleaning of air intake port The cap of the left side is turned counterclockwise, and this product is removed, and the outer air is adopted into the chamber, and it opens a outer door. Therefore, frost is easy to be settled around the air intake port inside the chamber.

  • Page 26: Troubleshooting

    TROUBLE SHOOTING If the unit malfunctions, check out the following before calling for service. Malfunction Check/Remedy The circuit breaker of power source is active. The chamber is not cooled The voltage is too low (In this case, call an electrician). at all The power is not supplied.

  • Page 27: Disposal Of Unit

    DISPOSAL OF UNIT WARNING 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 are locked completely with a key. The disposal of the unit should be accomplished by appropriate personnel. Always remove doors to prevent accidents such as suffocation.

  • Page 28: Disposal Of Battery

    DISPOSAL OF BATTERY Location of a nickel-metal-hydride battery This unit is provided a nickel-metal-hydride battery for the power failure warning device. The battery is located in the electrical box inside the cover on the lower left side. (Fig. 1) The high voltage components are enclosed in the electrical box. The electrical box cover should be removed by a qualified engineer or a service personnel only to prevent the electric shock.

  • Page 29: Temperature Recorder (Option)

    TEMPERATURE RECORDER (OPTION) WARNING Always disconnect the power supply to the unit prior to attachment of a temperature recorder in order to prevent electric shock or injury. A temperature recorder is available for the freezer as an optional component. The type of the temperature recorder is MTR-G85C.

  • Page 30: Installation Of Mtr-G85C

    TEMPERATURE RECORDER (OPTION) Starting recording and setting the time: Turn the power switch ON. The pen will move inward on the circular recording paper and stop temporarily at the 0% position (equivalent to the 40 C line). Then the pen will Ink pen move to the position which indicates the measured Hour...

  • Page 31: Backup Cooling Kit (Option)

    Chamber temperature is the time when -70 C can be holding for Liquid CO backup cooling kit. Keep a liquefied CO cylinder at less than 31 MDF-U76VA NU-9728GA Ambient temperature ( • The above data is the experiment value which uses liquid CO 30L. (no-load)
  • Page 32 .BACKUP COOLING KIT (OPTION) WARNING As with any equipment that uses CO or N , there is a likelihood of oxygen depletion in the vicinity of the equipment. It is important that you assess the work site to endure there is suitable and sufficient ventilation.

  • Page 33: Inventory Rack

    INVENTORY RACK The inventory racks are useful to store the precious materials in the chamber effectively. When the racks are used, it is necessary to adjust the height of the shelves. Set the shelf support as shown in the figure below. Inventory rack for 2”...

  • Page 34: Specifications

    SPECIFICATIONS Product name Ultra-Low Temperature Freezer NU-9728GA External dimensions W1010 mm x D870 mm x H1990 mm Internal dimensions W870 mm x D600 mm x H1400 mm Effective capacity 728 L Exterior Painted steel Interior Painted steel Outer door Painted steel...

  • Page 35: Performance

    PERFORMANCE Ultra-Low Temperature Freezer Product name NU-9728GA Cooling performance C at the center of the chamber (ambient temperature; 30 C, no load)* Temperature control range C to -86 C (ambient temperature; 30 C, no load) Power voltage AC 115 V...

  • Page 36: Safety Check Sheet

    Procedure to be adhered to in order to reduce safety risk indicated in b) below. Date : Signature : Address, Division : Telephone : Product name: Model: Serial number: Date of installation: Ultra-low temperature NU-9728GA reezer Please decontaminate the unit yourself before calling the service engineer.
  • Page 37 Printed in Mexico 7FB6P15164700 (08 November 2013)

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