SANYO
MDF-U443 Biomedical Freezer Instruction Manual Aug 2008
Instruction Manual
43 Pages
Preview
Page 1
INSTRUCTION MANUAL
BIOMEDICAL FREEZER
MDF-U443
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
Operation after power failure
P. 13
CHAMBER TEMPERATURE SETTING
P. 14
KEY LOCK FUNCTION
P. 14
FUNCTION MODE
P. 15
SETTING OF ALARM DELAY TIME
P. 15
SETTING OF TEMPERATURE ALARM
P. 16
SETTING OF ALARM RESUME TIME
P. 17
SETTING OF DOOR ALARM DELAY TIME
P. 18
SETTING OF COMPRESSOR DELAY TIME
P. 19
DEFROSTING Automatic defrosting
P. 20
Manual defrosting
P. 20
Sub-heater switch
P. 20
REMOTE ALARM TERMINAL
P. 21
ALARMS & SAFETY FUNCTIONS
P. 21
ROUTINE MAINTENANCE Cleaning of cabinet
P. 23
Cleaning of evaporating tray
P. 23
Cleaning of condenser filter
P. 24
Defrosting of chamber
P. 24
REPLACEMENT OF BATTERY
P. 25
TROUBLESHOOTING
P. 26
DISPOSAL OF UNIT
P. 27
Recycle of battery
P. 28
TEMPERATURE RECORDER (OPTION) Setting of MTR-4015LH
P. 32
Setting of MTR-85H
P. 34
Installation of MTR-4015LH
P. 36
Installation of MTR-85H
P. 37
SPECIFICATIONS
P. 39
PERFORMANCE
P. 40
SAFETY CHECK SHEET
P. 41
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INTRODUCTION ■ Read this manual carefully before using the appliance and follow the instructions for safety operation. ■ Sanyo 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 Sanyo sales representative or agent if any page of the manual is lost or page order is incorrect. ■ Contact Sanyo 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 Sanyo.
2
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.
< Label on the unit > This mark is labeled 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.
3
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. unqualified personnel may cause electric shock or fire.
The installation by
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. may cause explosion or fire.
These
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. may cause bad effect on your health or environment.
Improper use
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.
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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. 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. abnormal operation may cause electric shock or fire.
Continued
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. cord. A damaged cord may cause electric shock or fire.
Take care not to damage the power
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.
5
PRECAUTIONS FOR SAFE OPERATION
CAUTION 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.
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ENVIRONMENTAL CONDITIONS This equipment is designed to be safe at least under the following conditions (based on the IEC 61010-1): 1. Indoor use; 2. Altitude up to 2000 m; 3. Ambient temperature 5oC to 40oC 4. Maximum relative humidity 80% for temperature up to 31oC decreasing linearly to 50% relative humidity at 40oC; 5. Mains supply voltage fluctuations not to exceed ±10% of the nominal voltage; 6. Other supply voltage fluctuations as stated by the manufacture; 7. Transient overvoltages according to Installation Categories (Overvoltage Categories) II; supply the minimum and normal category is II; 8. Pollution degree 2 in accordance with IEC 60664.
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For mains
FREEZER COMPONENTS 13
15 16
17 1
2
13 3 12
11 Switch cover
4
5 10 9
8
7
6
14
19
22
21
20
13
18
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FREEZER COMPONENTS 1. Door:
13. Access port (left side, rear side): This is used for leading the measuring cable from the chamber to the outside.
To open the door, grip the handle.
2. Door gasket: This provides a tight door seal and prevents cold air leakage. Keep clean.
14. Fixture (rear side): 15. Lamp:
3. Inner door: Transparent acrylic plate minimizes cold air leakage.
16. Circulating fan (inside): Sucks in cold air that has been circulating in the chamber and sends it out for further circulation after re-cooling it.
o
4. Lock: Turn clockwise to 180 with a key and the outer door is securely locked. 5. Space for temperature recorder: to page 37 for installation.
Refer 17. Door switch: Stops the circulating fan when the door is open to prevent cold air leakage. Also activates the door lamp.
6. Evaporating tray: Defrost water from the evaporator accumulates on the tray and evaporates into the atmosphere. See page 23 for cleaning. 7. Control panel: details.
Lights up when door is open.
18. Communication box cover: 19. Remote alarm terminal: This is used to notice an alarm condition of the unit to remote location. Refer to page 21 “Remote alarm terminal”.
See page 10 for the
8. Leveling foot: Two feet are provided on the front side (right and left). Keep the unit in level by adjusting these feet at the installation. See page 12.
20. Battery switch ( ): This is a switch for power failure alarm. Be sure to turn off this switch to save the battery if the freezer is not in operation for long period. After installation, turn on the power switch and battery switch.
9. Caster: Four casters are provided to facilitate moving of the cabinet.
21. Sub-heater switch: Normally, turn this switch ON. Refer to page 20.
10. Condenser filter (inside): Clean a clogged condenser filter. See page 24 for the details.
22. Power switch: This is for turning ON/OFF the power to the unit. ON – “I” OFF – “○” The switch is covered by a switch cover to prevent the accidental push. To turn on or off the switch, remove the switch cover by loosening the screw.
11. Latch: This firmly latches the door to the freezer frame and prevents cold air leakage. 12. Shelf: Shelf location can be freely adjusted to match size of stored items.
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FREEZER COMPONENTS Control panel 1
2
3
10
9
8
1. Door lamp (DOOR):
4
7
6
5
This indicator lights when the door is open.
2. Alarm lamp (ALARM):
This lamp is flashed at the time of power failure or in the event of alarm.
3. Filter check lamp (FILTER): This lamp blinks when the condenser filter is clogged. condenser filter according to page 24.
Clean the
4. Digital temperature indicator: This indicator shows the current chamber temperature or set temperature. And error code is also indicated in the event of alarm. 5. Numerical value shift key ( shift.
):
Pressing this key in the setting mode causes the numerical value to
6. Digit shift key ( ): Pressing this key in the setting mode causes the changeable digit to shift. Key lock mode is led by pressing this key for more than 5 seconds in the temperature display mode. Refer to page 14 for the key lock function. 7. Set key (SET): Chamber temperature setting mode is led by pressing this key. The changeable digit is flashed. Pressing this key again after temperature setting memorizes the setting. 8. Defrost key (DEF): Manual defrosting is available by pressing this key for about 5 seconds in addition to the automatic defrosting. As for the details, see page 20. NOTE: A defrost key (DEF) doesn't work during the warming up of the product. (Con and chamber temperature are displayed alternately.) 9. Alarm buzzer stop key (BUZZER): Press this key to silence the buzzer in the event that the alarm operates and the buzzer sounds. The alarm buzzer sounds again with delay time when the same alarm status continues (refer to page 17). 10. Alarm test key (ALARM TEST): To check the alarm system during biomedical freezer operation. Pressing this key with the battery switch ON gets the alarm lamp to flash, the remote alarm to operate, and the buzzer to sound. Refer to page 17.
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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. ■ A location with adequate ventilation Leave at least 10 cm around the unit for ventilation. performance and consequently the failure.
Poor ventilation will result in a reduction of the
■ A location away from heat generating sources Avoid installing the unit near heat-emitting appliances such as a heater or a boiler etc. decrease the intended performance of the unit. ■ A location with little temperature change Install the unit under stable ambient temperature. +35oC.
Heat can
The allowable ambient temperature is between -5 and
■ A location with a sturdy and level floor Always install the unit on a sturdy and level floor. The uneven floor or tilted installation may cause failure or injury. Install the unit in stable condition to avoid the vibration or noise. Unstable condition may cause vibration or noise.
WARNING Install the unit on a sturdy floor. 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. Select a level and sturdy floor for installation. This precaution will prevent the unit from tipping. Improper installation may result in water spillage or injury from the unit tipping over. ■ A location not prone to high humidity Install the unit in the ambient of 80% R.H. or less humidity. current leakage or electric shock.
Installation under high humidity may cause
WARNING Do not use the unit outdoors. Current leakage or electric shock may result if the unit is exposed to rain water. 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. ■ A location without flammable or corrosive gas Never install the unit in a flammable or volatile location. This may cause explosion or fire or may result in the current leakage or electric shock by the corrosion of the electrical components. ■ A location without the possibility of anything fall Avoid installing the unit in the location where anything can fall down onto the unit. breakdown or failure of the unit.
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This may cause the
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. Then wipe off the panels with a dry cloth. 2. Adjusting the leveling foot Extend the leveling feet by rotating them counterclockwise to contact them to the floor. Ensure the unit is level. (Fig. 1) 3. Fixing the unit Two fixtures are attached to the rear of the frame. (Fig. 2) Fix the frame to the wall with these fixtures and rope or chain.
Leveling foot
fixture
Fig. 1
Fig. 2
4. Ground (earth) The ground (earth) is for preventing the electric shock in the case of the electrical insulation is somehow degraded. Always ground the unit at the time of installation.
WARNING Use a power supply outlet with ground (earth) to prevent electric shock. If the power supply outlet is not grounded, it is 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.
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START-UP OF UNIT Follow the procedures for the initial and consequent operations of the unit. 1. Check the power switch is off, battery switch is off and sub-heater switch is off. 2. Connect the power cord to the dedicated outlet with appropriate rating. switch.
Then turn on the power
3. Turn on the battery switch. Note: The battery needs to be replaced about every 3 years. battery replacement. 4. The alarm buzzer sometimes operates. stop key (BUZZER).
Contact Sanyo sales representative or agent for
In this case, stop the buzzer by pressing the alarm buzzer
5. Set the chamber temperature to the desired temperature. 6. Allow the chamber temperature to fall to the desired temperature. on the digital temperature indicator.
Check the chamber temperature
7. Press the alarm test key (ALARM TEST) and check that the alarm lamp blinks and alarm buzzer activates. 8. Begin slowly placing items into the chamber to minimize the temperature rise.
CAUTION Do not put too many warm articles into a freezer compartment before enough operating. few at a time after the freezer compartment temperature has cooled to at least -20oC.
Put items in a
Start-up of unit: The unit is programmed to repeatedly turn the compressor on and off in order to make its startability better when you start the unit at low ambient temperature (about 25oC or lower). However, the unit would start the operation without turning the compressor on and off repeatedly when you install the cooled unit at high ambient temperature and it causes the unit would have the starting current running with longer time. The unit should be exposed to ambient temperature sufficiently, 4 hours at least to avoid the breaker from trapping.
Operation after power failure The memory (chamber temperature setting and alarm temperature setting) is backed-up by nonvolatile memory. Accordingly, the freezer resumes the operation with setting before power failure.
CAUTION The start-up after power failure is subject to adverse affection such as voltage drop because all electrical appliance start to operate simultaneously. Always check the running status.
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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 -25oC. The chamber temperature is set to -40oC at the factory. Table 1
Chamber temperature -25oC)
Basic operation sequence (Example: Description of operation
Key operated
Indication after operation
1
Switch ON the freezer.
----
The current chamber temperature is displayed.
2
Press set key.
SET
The second digit is flashed.
3
Set the temperature to -25 with the digit shift key and the numerical value shift key.
4
Press set key.
When pressed, the settable digit moves. When pressed, the figure of settable digit increases. SET
Set temperature is memorized and the current chamber temperature is displayed.
Note: ￭ Although the range of the chamber temperature setting is between -15oC and -44oC, the guaranteed chamber temperature without load is -40oC when the ambient temperature is 35oC. ￭ The set mode returns to the temperature display mode automatically when 90 seconds has passed without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
KEY LOCK FUNCTION This unit is provided with the key lock function. When the key lock is ON, change of the setting through the key pad is not available. The key lock is set in OFF at the factory. Display
Table 2
Mode
Function
L
0
Key lock is OFF
Enable to change of the setting
L
1
Key lock is ON
Disable to change of the setting
Procedure for key lock setting (change from key lock OFF to key lock ON) Description of operation
Key operated
Indication after operation
1
Press digit shift key for 5 seconds.
The first digit is flashed.
2
Press numerical value shift key and scroll the figure to 1.
When pressed, the figure of settable digit increases.
3
Press set key.
SET
The key lock is set to ON. The current chamber temperature is displayed.
Note: ￭ The key lock works for the chamber temperature setting and function mode. ￭ To release the key lock, select L0 when performing the key lock mode operation described above. ￭ The set mode returns to the temperature display mode automatically when 90 seconds has passed without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
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FUNCTION MODE This unit has the following function mode. Indication
Mode
Settable range
F01
Setting of high temperature alarm
Between 5 and 20oC higher than the chamber set temperature (1oC gradient)
F02
Setting of low temperature alarm
Between -5 and -20oC lower than the chamber set temperature (1oC gradient)
F04
Setting of delay time of door alarm
Between 1 and 15 minutes (1 minute gradient)
F05
Setting of compressor delay time (for low stage side only)
Between 2 and 15 minutes (1 minute gradient)
F25
Setting of alarm resume time
000 or between 10 and 60 minutes (10-minute gradient)
F50
Setting of alarm delay time
Between 0 and 15 minutes (1 minute gradient)
SETTING OF ALARM DELAY TIME The delay time of the buzzer and remote alarm for high and low temperature alarm can be set between 0 and 15 minutes. The procedure in table 3 shows the sequence to set the delay time to 10 minutes. The delay time is set to 15 minutes at the factory. Table 3
Setting procedure for alarm delay time (change from 15 minutes to 10 minutes) Description of operation
1
Key operated
Indication after operation The current chamber temperature is displayed.
----
2
Press numerical value shift key for 5 seconds.
The first digit is flashed.
3
Scroll the figure to F50 by using digit shift key and numerical value shift key
When pressed, the figure of settable digit changes. When pressed, the changeable digit moves.
4
Press set key.
5
Set the figure to 010 with the numerical value shift key.
SET
The current delay time is displayed. The first digit is flashed. When pressed, the figure of the first digit changes.
The delay time is memorized and 6 Press set key. SET the current chamber temperature is displayed. ￭ The set mode returns to the temperature display mode automatically when 90 seconds has passed without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
15
SETTING OF TEMPERATURE ALARM 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 10oC higher than the set temperature Low temperature alarm: activates at the temperature -10oC lower than the set temperature Note: The alarm temperature is set at the factory 15oC higher and lower than the set temperature. The available range of alarm temperature is between 5oC and 20oC higher or lower than the set temperature. Table 4.
Procedure for setting high temperature alarm Description of operation
1 2 3
---Press numerical value shift key for about 5 seconds. Press numerical value shift key and scroll the figure to 1.
4
Press set key.
5
Scroll the figure to 010 by using the digit shift key and the numerical value shift key
6
Press set key.
Table 5.
3 4
Indication after operation The current chamber temperature is displayed. The first digit is flashed. The first digit is flashed.
SET
SET
The current setting is displayed. When pressed, the figure of settable digit changes. When pressed, the changeable digit moves. Alarm temperature is memorized and the current chamber temperature is displayed.
Procedure for setting low temperature alarm
(Change from -15oC to -10oC)
Description of operation
Indication after operation The current chamber temperature is displayed.
1 2
Key operated
(Change from 15oC to 5oC)
Key operated ----
Press numerical value shift key for about 5 seconds. Press numerical value shift key and scroll the figure to 2.. Press set key.
The first digit is flashed. The first digit is flashed. SET
The current setting is displayed.
When pressed, the figure of settable digit changes. 5 When pressed, the changeable digit moves. Alarm temperature is memorized and 6 Press set key. SET the current chamber temperature is displayed. ￭ The set mode returns to the temperature display mode automatically when 90 seconds has passed Scroll the figure to -10 by using the digit shift key and the numerical value shift key
without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
16
SETTING OF ALARM RESUME TIME The alarm buzzer is silenced by pressing alarm buzzer stop key (BUZZER) on the control panel during alarm condition.(The remote alarm sound and lamp are not silenced. ) 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. The example in the table is based on the assumption that the desired duration is 20 minutes. The duration is set to 30 minutes at the factory. Table 6
Setting procedure for alarm resume time (change from 30 minutes to 20 minutes) Description of operation
1
Key operated
The current chamber temperature is displayed.
----
2
Press numerical value shift key for 5 seconds.
3
Set the figure to F25 with the numerical value shift key and the digit shift key.
4
Press set key.
5
Set the figure to 020 with the numerical value shift key.
Indication after operation
The first digit is flashed. When pressed, the figure of settable digit changes. When pressed, the figure of settable digit changes. SET
The current setting is displayed. The second digit is flashed. When pressed, the figure of settable digit changes.
The setting is memorized and the current chamber temperature is displayed. ￭ The settable alarm resume time is 10, 20, 30, 40, 50, or 60 minutes (The setting is 010, 020, 030, 040, 050, or 060). The buzzer would not reset if the resume time is set in 000. ￭ It is recommended to set the alarm resume time when the freezer is not under alarm condition. The setting during alarm condition is effective on the next alarm condition. ￭ The setting cannot be changed during power failure. ￭ The set mode returns to the temperature display mode automatically when 90 seconds has passed without any key operation. In this case, any setting before pressing set key (SET) is not memorized. ￭ The setting of alarm resume time is invalid when the delay time for high and low temperature alarm is set to 0. 6
Press set key.
SET
17
SETTING OF DOOR ALARM DELAY TIME The buzzer of door alarm is activated with 2 minutes delay when the door is open. The delay time is changeable. Follow the procedure in table 8 below to change the setting of delay time. The procedure assumes that the delay time is changed from 2 minutes to 3 minutes. (The delay time is set in 2 minutes at the factory.) Table 8.
Changing procedure for delay time (change from 2 minutes to 3 minutes) Description of operation
1
Key operated
Indication after operation The current chamber temperature is displayed.
----
2
Press numerical value shift key for 5 seconds.
The first digit is flashed.
3
Set the figure to F04 with the numerical value shift key.
When pressed, the figure of settable digit changes.
4
Press set key.
5
Set the figure to 003 with the numerical value shift key.
6
Press set key.
SET
The current delay time is displayed. The first digit is flashed. When pressed, the figure of the first digit changes.
SET
The delay time is memorized and the current chamber temperature is displayed.
Note: • The setting range for delay time is between 1and 15 minutes. ￭ The set mode returns to the temperature display mode automatically when 90 seconds has passed without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
18
SETTING OF COMPRESSOR DELAY TIME The delay time of low stage side compressor can be set 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 is based on the assumption that the delay time is changed to 7 minutes. The delay time is set to 5 minutes at the factory. Note: ￭ The setting range for delay time is between 2 and 15 minutes. The cool down of chamber temperature may be slow when the setting of delay time is over 8 minutes, depending on the installation environment. ￭ There is no need of changing the delay time when the capacity of power source is enough. Table 7
Changing procedure for delay time (change from 5 minutes to 4 minutes) Description of operation
1
Key operated
Indication after operation The current chamber temperature is displayed.
----
2
Press numerical value shift key for 5 seconds.
The first digit is flashed.
3
Set the figure to F05 with the numerical value shift key.
When pressed, the figure of settable digit changes.
4
Press set key.
5
Set the figure to 004 with the numerical value shift key.
SET
The current delay time is displayed. The first digit is flashed. When pressed, the figure of the first digit changes.
The delay time is memorized and 6 Press set key. SET the current chamber temperature is displayed. ￭ The start up may be behind the delay time set by the above procedure because the compressor is affected by the chamber temperature and temperature of cascade condenser installed in the freezer. (The high stage side compressor starts to operate without delay time at the time of power on or after power failure.) ￭ The set mode returns to the temperature display mode automatically when 90 seconds has passed without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
19