Panasonic MDF-U76V User manual

Please read these instructions carefully before using this product, and save this manual for future use.
See page 40 for all Model Nos.
MMMMDFDFDFDF----U76VU76VU76VU76VMDFMDFMDFMDF----U76VCU76VCU76VCU76VCMDFMDFMDFMDF----U56VU56VU56VU56VMDFMDFMDFMDF----U56VU56VU56VU56VCCCC
MDF U56V
Ultra-Low Temperature Freezer
Operating
I
nstructions

1
CONTENTS
INTRODUCTION P. 2
PRECAUTIONS FOR SAFE OPERATION P. 3
ENVIRONMENTAL CONDITIONS P. 7
FREEZER COMPONENTS P. 8
Control pan l P.10
REMOTE ALARM TERMINAL P. 11
AIR INTAKE PORT P. 11
INSTALLATION SITE P. 12
INSTALLATION P. 13
START-UP OF UNIT P. 14
CHAMBER TEMPERATURE SETTING P. 15
KEY LOCK FUNCTION P. 15
ALARM TEMPERATURE SETTING P. 16
SETTING OF ALARM RESUME TIME P. 17
MONITOR OF FREEZER STATUS P. 18
SETTING OF COMPRESSOR DELAY TIME P. 19
SETTING OF DOOR ALARM DELAY TIME P. 20
ALARMS & SAFETY FUNCTIONS P. 21
ROUTINE MAINTENANCE
Cl aning of cabin t P. 22
Cl aning of cond ns r filt r P. 22
D frosting of insid wall P. 23
Cl aning of air intak port P. 24
TROUBLESHOOTING P. 25
DISPOSAL OF UNIT P. 26
R cycl of batt ry P. 26
D contamination of unit P. 26
DISPOSAL OF BATTERY P. 31
TEMPERATURE RECORDER (OPTION) P. 32
S tting of MTR-G85 P. 32
Installation of MTR-G85 P. 34
BACK UP COOLING KIT (OPTION) P. 34
SMALL INNER DOOR (OPTION) P. 36
DRAWER RACK(OPTION) P. 36
INTERFACE BOARD (OPTION) P. 36
Installation of MTR-480 P. 36
INVENTORY RACK (OPTION) P. 37
SPECIFICATIONS P. 38
PERFORMANCE P. 40
SAFETY CHECK SHEET P. 41

2
INTRODUCTION
■ R ad this manual car fully b for using th applianc and follow th instructions for saf ty op ration.
■ Our company n v r guarant any saf ty if th applianc is us d for any obj cts oth r than int nd d
us or us d by any proc dur s oth r than thos m ntion d in this manual.
■ K p this manual in an ad quat plac to r f r to it as n c ssary.
■ Th cont nts of th manual will b subj ct d to chang without notic du to th improv m nt of
p rformanc or functions.
■ Contact our sal s r pr s ntativ or ag nt if any pag of th manual is lost or pag ord r is incorr ct.
■ Contact our sal s r pr s ntativ or ag nt if any point in this manual is uncl ar or if th r ar any
inaccuraci s.
■ No part of this manual may b r produc d in any form without th xpr ss d writt n p rmission of our
company.
CAUTION
Our company guarant s th product und r c rtain warranty conditions. Our company in no
way shall b r sponsibl for any loss of cont nt or damag of cont nt.

3
PRECAUTIONS FOR SAFE OPERATION
It is imperative that the user complies with this manual as it contains
important safet advice.
It ms and proc dur s ar d scrib d so that you can us this unit corr ctly and saf ly.
If th pr cautions advis d ar follow d, this will pr v nt possibl injury to th us r and
any oth r p rson.
Pr cautions ar illustrat d in th following way:
WARNING
Failur to obs rv WARNING signs could r sult in a hazard to p rsonn l
possibly r sulting in s rious injury or d ath.
CAUTION
Failur to obs rv CAUTION signs could r sult in injury to p rsonn l and
damag to th unit and associat d prop rty.
Symbol shows;
this symbol m ans caution.
this symbol m ans an action is prohibit d.
this symbol m ans an instruction must b follow d.
B sur to k p this manual in a plac acc ssibl to us rs of this unit.
Som warning and/or caution lab ls ar attach d on th unit. Following shows th d scription of such
lab ls.
This lab l is on th cov r in which th l ctrical compon nts of high voltag ar nclos d
to pr v nt th l ctric shock. Th cov r should b r mov d by a qualifi d ngin r or a
s rvic p rsonn l only.
This symbol m ans att ntion or r f r to docum nt.
This symbol m ans arth.
This symbol m ans pow r switch “ON”.
This symbol m ans pow r switch “OFF”.
WARNING
As with any quipm nt that us s CO
2
gas, th r is a lik lihood of oxyg n d pl tion in th vicinity
of th quipm nt. It is important that you ass ss th work sit to nsur th r is suitabl and
suffici nt v ntilation. If r strict d v ntilation is susp ct d, th n oth r m thods of nsuring a
saf nvironm nt must b consid r d. Th s may includ atmosph r monitoring and
warning d vic s.

4
PRECAUTIONS FOR SAFE OPERATION
Do not use the unit outdoors. Curr nt l akag or l ctric shock may r sult if th unit is xpos d to
rain wat r.
Onl qualified engineers or service personnel should install the unit. Th installation by
unqualifi d p rsonn l may caus l ctric shock or fir .
Install the unit on a sturd floor and take an adequate precaution to prevent the unit from
turning over. If th floor is not strong nough or th installation sit is not ad quat , this may r sult
in injury from th unit falling or tipping ov r.
Never install the unit in a humid place or a place where it is likel to be splashed b water.
D t rioration of th insulation may r sult which could caus curr nt l akag or l ctric shock.
Never install the unit in a flammable or volatile location. This may caus xplosion or fir .
Never install the unit where acid or corrosive gases are present as curr nt l akag or l ctric
shock may r sult du to corrosion.
Alwa s ground (earth) the unit to prevent electric shock. If th pow r supply outl t is not
ground d, it will b n c ssary to install a ground by qualifi d ngin rs.
Never ground the unit through a gas pipe, water main, telephone line or lightning rod. Such
grounding may caus l ctric shock in th cas of an incompl t circuit.
Connect the unit to a power source as indicated on the rating label attached to the unit. Us of
any oth r voltag or fr qu ncy oth r than that on th rating lab l may caus fir or l ctric shock.
Never store volatile or flammable substances in this unit if th contain r cannot b s al d. Th s
may caus xplosion or fir .
Do not insert metal objects such as a pin or a wire into an vent, gap or an outlet on the unit.
This may caus l ctric shock or injury by accid ntal contact with moving parts.
Use this unit in safe area when treating the poison, harmful or radiate articles. Improp r us
may caus bad ff ct on your h alth or nvironm nt.
Turn off the power switch (if provided) and disconnect the power suppl to the unit prior to an
repair or maintenance of th unit in ord r to pr v nt l ctric shock or injury.
Do not touch an electrical parts (such as power suppl plug) or operate switches with a wet
hand. This may caus l ctric shock.
WARNING

5
PRECAUTIONS FOR SAFE OPERATION
Ensure ou do not inhale or consume medication or aerosols from around th unit at th tim of
maint nanc . Th s may b harmful to your h alth.
Never splash water directl onto the unit as this may caus l ctric shock or short circuit.
Never put containers with liquid on the unit as this may caus l ctric shock or short circuit wh n
th liquid is spill d.
Never bind, process, or step on the power suppl cord, or never damage or break the power
suppl plug. A brok n supply cord or plug may caus fir or l ctric shock.
Do not use the suppl cord if its plug is loose. Such supply cord may caus fir or l ctric shock.
Never disassemble, repair, or modif the unit ourself. Any such work carri d out by an
unauthoriz d p rson may r sult in fir , or l ctric shock or injury du to a malfunction.
Disconnect the power suppl plug if there is something wrong with the unit. Continu d
abnormal op ration may caus l ctric shock or fir .
When removing the plug from the power suppl outlet, grip the power suppl plug, not th cord.
Pulling th cord may r sult in l ctric shock or fir by short circuit.
Disconnect the power suppl plug b for moving th unit. Tak car not to damag th pow r
cord. A damag d cord may caus l ctric shock or fir .
Disconnect the power plug when the unit is not used for long periods. K ping th conn ction
may caus l ctric shock, curr nt l akag , or fir du to th d t rioration of insulation.
If th unit is to b stor d unus d in an unsup rvis d ar a for an xt nd d p riod, ensure that
children do not have access and that doors are locked completel with a ke .
The disposal of the unit should be accomplished b appropriate personnel. R mov doors to
pr v nt accid nts such as suffocation.
Do not put the packing plastic bag within reach of children as suffocation may r sult.
WARNING

6
PRECAUTIONS FOR SAFE OPERATION
This unit must be plug into a dedicated circuit protected b branch circuit breaker.
Use a dedicated power source as indicat d on th rating lab l attach d to th unit. A multipl -tap
may caus fir r sulting from abnormal h ating.
Connect the power suppl plug to the power source firml after removing the dust on the plug.
A dusty plug or improp r ins rtion may caus a h at or ignition.
Never store corrosive substances such as acid or alkali in this unit if th contain r cannot b
s al d. Th s may caus corrosion of inn r compon nts or l ctric parts.
Check the setting when starting up of operation after power failure or turning off of power
switch. Th stor d it ms may b damag d du to th chang of s tting.
Be careful not to tip over the unit during mov m nt to pr v nt damag or injury.
Prepare a safet check sheet (cop the last page) wh n you r qu st any r pair or maint nanc for
th saf ty of s rvic p rsonn l.
CAUTION

7
ENVIRONMENTAL CONDITIONS
This quipm nt is d sign d to b saf at l ast und r th following conditions (bas d on th IEC,61010-1):
■ Indoor us ;
■ Altitud up to 2000 m;
■ Ambi nt t mp ratur 5
o
C to 40
o
C;
■ Maximum r lativ humidity 80% for t mp ratur up to 31
o
C d cr asing lin arly to 50% r lativ humidity
at 40
o
C;
■ Mains supply voltag fluctuations up to ±10% of th nominal voltag ;
■ Transi nt ov rvoltag s up to th l v ls of OVERVOLTAGE CATEGORY II;
■ T mporary OVERVOLTAGES occurring on th mains supply;
■ Applicabl pollution d gr of th int nd d nvironm nt (POLUTION DEGREE 2 in most cas s)

8
FREEZER COMPONENTS
11(inside)
7
15
1
2
3
6
8
12
7
4
9
10
13
5
Pow r cord
17
18
16
14
19
Rear side

9
FREEZER COMPONENTS
1. Control panel (on the upper front of the outer door): Us d for t mp ratur s tting and indication
of op rating status is display d on th pan l. S pag 10 for d tails.
2. Outer door: To op n th door, grip th handl . On closing, lock th out r door latch compl t ly.
3. Inner door: Th op ration of th inn r door should b quick to minimiz th t mp ratur ris in
chamb r. Lock th inn r door latch compl t ly wh n th inn r door is clos d. Th inn r door is
r movabl for cl aning or d frosting. S pag 23 “Routin maint nanc ”.
4. Outer door latch: Always lock th latch wh n th out r door is clos d.
5. Inner door latch: Always lock th inn r door latch wh n th inn r door is clos d.
6. Magnetic door gasket: This provid s a tight door s al and pr v nts cold air l ak. K p cl an.
7. Access port (rear and bottom): This is us d for l ading a cabl and s nsor of a m asuring
quipm nt, or nozzl of back up cooling kit to chamb r.
8. Air intake vent (grille): Do not block this v nt to k p th prop r cooling p rformanc .
9. Caster: Four cast rs ar provid d to facilitat moving of th cabin t. For th installation, adjust th
l v ling foot so that th front two cast rs cannot contact with th floor.
10. Leveling foot: Th h ight of th fr z r can b adjust d by this scr w typ foot. K p th unit in
l v l at th installation.
11. Condenser filter (behind the grille): This filt r pr v nts th dust from accumulating on th
cond ns r. Th dusty cond ns r filt r may caus failur of r frig rating d vic . Cl an th cond ns r
filt r onc a month. S pag 22 “Routin maint nanc ” for th cl aning.
12. Space for temperature recorder: An automatic t mp ratur r cord r (optional compon nt) can b
attach d h r . S pag 32“ T mp ratur r cord r (Option)”.
13. Ke lock: Turn clockwis to 180
o
with a k y and th out r door is s cur ly lock d.
14. Air intake port: Aft r closing th out r door, if us d to op n soon. S pag 11
B sur to clos th cap of th air intak port aft r th us .
* R plac th cap wh n th air intak port is not us d. Improp r r plac m nt may caus ris of
chamb r t mp ratur or cond nsation around th air intak port.
15. Fixture (on back side): Two fixtur s ar provid d as spac rs b tw n th cabin t and wall and also
s rv as hooks to fix th unit. S pag 13 “Installation”.
16. Power switch: This is for turning ON/OFF th pow r to th unit. ON – “I” OFF – “○”
17. Remote alarm terminal: This is us d to notic an alarm condition of th unit to r mot location.
R f r to pag 11 “R mot alarm t rminal”.
18. Batter switch: This is a switch for a batt ry for pow r failur alarm. Normally, turn on this switch.
B sur to turn off this switch if th fr z r is not in op rating for th long p riod (ov r on month).
19. Fuse: AC 250 V, 5 A is attach d.
WARNING
Fix th sh lf supports and sh lv s s cur ly. Incompl t installation may caus injury or damag .
N v r touch th storag it ms with w t hands. Touching with th w t hands may caus frostbit .
R plac th cap wh n th air intak port is not us d. Improp r r plac m nt may caus ris of chamb r
t mp ratur or cond nsation around th air intak port.

10
FREEZER COMPONENTS
Control panel
1. Digital temperature indicator: This indicator shows th pr s nt chamb r t mp ratur or s t
t mp ratur .
2. Status monitor lamp (STATUS): This lamp lights wh n nvironm ntal condition or status g ts wors
or th unit is out of normal op ration.
3. Batter check lamp (BATTERY): This lamp lights to r comm nd th batt ry r plac m nt. This
lamp blinks wh n a fan motor is r plac m nt. For th r plac m nt, consult our sal s r pr s ntativ or
ag nt.
4. Door check lamp (DOOR): This lamp lights wh n th out r door is op n.
5. Alarm lamp (ALARM): This lamp is flash d during alarm condition.
6. Filter check lamp (FILTER): This lamp lights and buzz r sound wh n th xc ssiv dust is
accumulat d on th cond ns r filt r. Wh n this lamp lights, cl an th cond ns r filt r following th
proc dur on pag 22.
7. Numerical value shift ke ( ): Pr ssing this k y in th s tting mod caus s th num rical valu to
shift. “ON-OFF” of k y lock can b s l ct d by pr ssing this k y in th k y lock s tting mod . By
pr ssing this k y for mor than 5 s conds in th t mp ratur display mod l ads s tting mod for alarm
t mp ratur , alarm r sum tim ,compr ssor d lay tim and door alarm d lay tim . R f r to pag 15,
16,17,19 and 20 for d tails r sp ctiv ly.
8. Digit shift ke ( ): Pr ssing this k y in th s tting mod caus s th chang abl digit to shift. K y
lock s tting is availabl by pr ssing this k y for mor than 5 s conds in th t mp ratur display mod .
R f r to pag 15 for d tails.
9. Set ke (SET): T mp ratur s tting mod is l d by pr ssing this k y and th chang abl digit is
flash d. By pr ssing this k y again, th s tting is m moriz d. Th s tting mod r turns to th
t mp ratur display mod automatically wh n 90 s conds has pass d without any k y op ration.
10. Status ke (STATUS): By pr ssing this k y in th v nt of th status monitor lamp ON, th status
cod is display d on th digital t mp ratur indicator. This k y is not ff ctiv wh n th fr z r is
running normally. S pag 18 for d tails.
11. Alarm test ke (ALARM TEST): To ch ck th alarm syst m during fr z r op ration. Pr ssing
this k y with th batt ry switch ON g ts th alarm lamp to flash, th r mot alarm to op rat , and th
buzz r to sound.
12. Buzzer stop ke (BUZZER): To sil nc th audibl alarm und r alarm condition, pr ss this k y.
Th buzz r during alarm t st cannot b sil nc d by this k y. But th r mot alarm is not canc l d.
12
BATTERY
STATUS
FILTER
ALARM
DOOR
TEMPERA
TURE
(
o
C)
BUZZER
ALARM
TEST
STATUS
SET
11
10
9
8
7
1
3
2
6
5
4

11
REMOTE ALARM TERMINAL
Th t rminal of th r mot alarm is install d at th low r l ft sid of th unit. Th alarm is outputt d from
this t rminal. Contact capacity is DC 30 V, 2 A.
Contact output:
b tw n COM. and N.O. b tw n COM. and N.C.
At normal Op n Clos
At abnormal Clos Op n
Note:
• Th buzz r is sil nc d by pr ssing buzz r stop k y (BUZZER) on th control pan l during alarm
condition. (A r mot alarm is continuing th op ration.)
Th buzz r will b activat d again aft r c rtain susp nsion if th alarm condition is continu d.
• Th alarm is actuat d wh n th pow r supply plug is disconn ct d from th outl t or th pow r switch is
OFF.
AIR INTAKE PORT
Wh n a door is clos d and op n d soon, a door do s not
som tim s op n this product.
Th warm air which w nt into th chamb r is cool d down rapidly,
and this is b caus air insid th chamb r contract d.
Wh n a door is clos d and op n d soon, a door is asy to op n
with th following proc ss.
1. Turn th cap of th l ft sid count rclockwis about two laps.
(That can b r mov d compl t ly)
2. Put th air into th chamb r from about tw nty s conds, and
op n a door.
3. Clos a cap if a door op ns.
A door may not op n in th abov m thod wh n th r ar frost and ic in th air intak port. In that cas ,
op n a cap, and inv stigat th matt r wh th r th r is no frost insid th air intak port. R mov frost
insid th air intak port in "th air intak port cl aning stick" of th acc ssori s wh n th r is frost.
Cl an a air intak port v ry month v n wh n th r is no frost insid th air intak port. R f r to pag
24.
WARNING
For r moving th frost of th air intak port, do not us a tool with sharp dg such as a knif or a scr w
driv r.
R plac th cap wh n th air intak port is not us d. Improp r r plac m nt may caus ris of chamb r
t mp ratur or cond nsation around th air intak port.
Cap
Two laps
Us a twist d s al d wir for th conn ction.
Typ UL2343, UL2448, UL2464, UL2552, UL 2623
L ngth: 30 m max.

12
INSTALLATION SITE
To op rat this unit prop rly and to obtain maximum p rformanc , install th unit in a location with th
following conditions:
■ A location not subjected to direct sunlight
Do not install th unit und r dir ct sunlight. Installation in a location subj ct d to dir ct sunlight cannot
obtain th int nd d p rformanc .
■ A location with adequate ventilation
L av at l ast 10 cm around th unit for v ntilation. Poor v ntilation will r sult in a r duction of th
p rformanc and cons qu ntly th failur .
■ A location awa from heat generating sources
Avoid installing th unit n ar h at- mitting applianc s such as a h at r or a boil r tc. H at can
d cr as th int nd d p rformanc of th unit.
■ A location with little temperature change
Install th unit und r stabl ambi nt t mp ratur . Th allowabl ambi nt t mp ratur is b tw n +5 and
+30
o
C.
■ A location with a sturd and level floor
Always install th unit on a sturdy and l v l floor. Th un v n floor or tilt d installation may caus failur
or injury. Install th unit in stabl condition to avoid th vibration or nois . Unstabl condition may
caus vibration or nois .
WARNING
Install the unit on a sturd floor. If th floor is not strong nough or th installation sit is not ad quat ,
this may r sult in injury from th unit falling or tipping ov r.
Select a level and sturd floor for installation. This pr caution will pr v nt th unit from tipping.
Improp r installation may r sult in wat r spillag or injury from th unit tipping ov r.
■ A location not prone to high humidit
Install th unit in th ambi nt of 80% R.H. or l ss humidity. Installation und r high humidity may caus
curr nt l akag or l ctric shock.
WARNING
Do not use the unit outdoors. Curr nt l akag or l ctric shock may r sult if th unit is xpos d to rain
wat r.
Never install the unit in a humid place or a place where it is likel to be splashed b water.
D t rioration of th insulation may r sult which could caus curr nt l akag or l ctric shock.
■ A location without flammable or volatile gas
N v r install th unit in a flammabl or volatil location. This may caus xplosion or fir or may r sult in
th curr nt l akag or l ctric shock by th corrosion of th l ctrical compon nts.
■ A location without the possibilit of an thing fall
Avoid installing th unit in th location wh r anything can fall down onto th unit. This may caus th
br akdown or failur of th unit.

13
INSTALLATION
1. Removing the packaging materials and tapes
R mov all transportation packaging mat rials and tap s. Op n th doors and v ntilat th unit. If th
outsid pan ls ar dirty, cl an th m with a dilut d n utral dishwashing d t rg nt. (Undilut d d t rg nt
can damag th plastic compon nts. For th dilution, r f r to th instruction of th d t rg nt.) Aft r th
cl aning with th dilut d d t rg nt, always wip it off with a w t cloth. Th n wip off th pan ls with a dry
cloth.
Note:
R mov th cabl ti banding th pow r supply cord. Prolong d banding may caus th corrosion of th
cord coating.
2. Adjusting the leveling foot
Ext nd th l v ling f t by rotating th m count rclockwis to contact th m to th floor. Ensur th unit is
l v l. (Fig. 1)
3. Fixing the unit
Two fixtur s ar attach d to th r ar of th fram . Fix th fram to th wall with th s fixtur s and rop
or chain. (Fig. 2)
4. Ground (earth)
Th ground ( arth) is for pr v nting th l ctric shock in th cas of th l ctrical insulation is som how
d grad d. Always ground th unit at th tim of installation.
WARNING
Use a power suppl outlet with ground (earth) to pr v nt l ctric shock. If th pow r supply outl t is
not ground d, it is n c ssary to install a ground by qualifi d ngin rs.
Never ground the unit through a gas pipe, water main, telephone line or lightning rod. Such
grounding may caus l ctric shock in th cas of an incompl t circuit.
5. Installing the earth leakage breakers
This product is to conn ct a arth l akag br ak r to th pow r supply sid of th product.
Contact our sal s r pr s ntativ or ag nt at th tim of installation of th arth l akag br ak r.
L v ling foot
Fig.1 Fixtur Fig. 2

14
START-UP OF UNIT
Follow th proc dur s for th initial and cons qu nt op rations of th unit.
1. Turn off th switch of th back up cooling kit (optional compon nt) if it is install d.
2. Conn ct th pow r supply cord to th d dicat d outl t having appropriat rating with th chamb r
mpty, and turn on th pow r switch on th fr z r.
3. Turn on th batt ry switch.
4. S t th d sir d chamb r t mp ratur . S pag 15 for th chamb r t mp ratur s tting.
5. Ch ck that th chamb r t mp ratur r ach s th d sir d t mp ratur .
6. Turn on th switch of back up cooling kit (optional compon nt) if it is install d.
7. Mak sur that th alarm lamp blinks and th buzz r sounds by pr ssing th alarm t st k y (ALARM
TEST). Th r mot alarm is also op rat d. E09 is display d on th digital t mp ratur indicator if th
batt ry switch is OFF. Mak sur to turn on th batt ry switch.
8. Aft r confirming th abov , you can put articl s into th chamb r in a small batch to pr v nt th
t mp ratur ris .
CAUTION
Do not put too many warm articl s in th chamb r. Th t mp ratur ris may caus th damag
to th articl s in th chamb r.
WARNING
Fix th sh lf supports and sh lv s s cur ly. Incompl t installation may caus injury or damag .
Operation after power failure
Th s t valu is m moriz d by nonvolatil m mory. Accordingly, th fr z r r sum s th op ration with
s tting b for pow r failur .
Wh n th fr z r is r cov r d from pow r failur with th chamb r t mp ratur high r than th pr s t
t mp ratur , th n th high t mp ratur alarm is activat d and th buzz r sounds and th r mot alarm is
also activat d. Push th buzz r stop k y (BUZZER) to sil nc buzz r and tak appropriat actions if
n d d.
WARNING
Wh n this product op rat s at th first start-up or aft r no us for long p riod, th built-in batt ry capacity
may b low r d or compl t ly z ro b caus of discharg of th batt ry. Aft r installation th product, th
fr z r should op rat for mor than 3 days (72 hours) to charg th batt ry.

15
CHAMBER TEMPERATURE SETTING
Tabl 1 shows th basic proc dur for s tting th chamb r t mp ratur . P rform k y op rations in th
s qu nc indicat d in th tabl . Th xampl in th tabl is bas d on th assumption that th d sir d
t mp ratur is -75
o
C.
Note: Th unit is s t at th factory that th chamb r t mp ratur -80
o
C.
Table 1. Basic operation sequence (Example: Chamber temperature -75
o
C)
Description of operation Ke operated
Indication after operation
1
Turn th pow r switch ON. ----
Th curr nt chamb r t mp ratur is
display d.
2
Pr ss s t k y. SET Th s cond digit is flash d.
3
S t to -75 with th num rical valu
shift k y and digit shift k y.
Wh n pr ss d, th figur of s ttabl
digit chang s.
Wh n pr ss d, th s ttabl digit
is shift d.
4
Pr ss s t k y. SET
S t t mp ratur is m moriz d and th
curr nt chamb r t mp ratur is
display d.
Note:
• Although th valu of th chamb r t mp ratur s tting can rang from -50
o
C to -90
o
C, th guarant d
t mp ratur wh n th r is no load is -86
o
C wh n th ambi nt t mp ratur is 30
o
C.
• Th s tting mod r turns to th t mp ratur display mod automatically wh n 90 s conds has pass d
without any k y op ration. In this cas , any s tting b for pr ssing s t k y (SET) is not m moriz d.
KEY LOCK FUNCTION
This unit is provid d with th k y lock function. Wh n th k y lock is ON, chang of t mp ratur s tting
through th k y pad is not availabl . Th k y lock is s t in OFF at th factory.
Display Mod Function
L 0 K y lock is OFF Enabl to chang of t mp ratur s tting
L 1 K y lock is ON Disabl to chang of t mp ratur s tting
Table 2. Procedure for ke lock setting (change from ke lock OFF to ke lock ON)
Description of operation Ke operated
Indication after operation
1
---- Th curr nt chamb r t mp ratur is
display d.
2
Pr ss digit shift k y for 5 s conds.
Th first digit is flash d.
3
Pr ss num rical valu shift k y
and scroll th figur to 1. Wh n pr ss d, th figur of s ttabl
digit chang s.
4
Pr ss s t k y. SET
Th k y lock is s t to ON.
Th curr nt chamb r t mp ratur is
display d.
• Th s tting mod r turns to th t mp ratur display mod automatically wh n 90 s conds has pass d
without any k y op ration.

16
ALARM TEMPERATURE SETTING
This unit is provid d with th high and low t mp ratur alarm and th t mp ratur at which th alarm is
activat d is chang abl .
Th following proc dur shows th s tting of alarm t mp ratur according to th condition b low:
High t mp ratur alarm: activat s at th t mp ratur 5
o
C high r than th s t t mp ratur
Low t mp ratur alarm: activat s at th t mp ratur 5
o
C low r than th s t t mp ratur
Note:
Th alarm t mp ratur is s t at th factory 10
o
C high r and low r than th s t t mp ratur .
Th availabl rang of alarm t mp ratur is b tw n 5
o
C and 40
o
C high r or low r than th s t
t mp ratur .
Table 3. Procedure for setting high temperature alarm
Description of operation Ke operated
Indication after operation
1
---- Th curr nt chamb r t mp ratur is
display d.
2
Pr ss num rical valu shift k y for
about 5 s conds.
Th first digit is flash d.
3
Pr ss num rical valu shift k y
and scroll th figur to 1. Th first digit is flash d.
4
Pr ss s t k y. SET Th first digit is flash d.
5
Scroll th figur to 005 by using
digit shift k y and num rical valu
shift k y
Wh n pr ss d, th figur of s ttabl
digit chang s.
Wh n pr ss d, th chang abl digit
mov s.
6
Pr ss s t k y. SET
Alarm t mp ratur is m moriz d and
th curr nt chamb r t mp ratur is
display d.
Table 4. Procedure for setting low temperature alarm
Description of operation Ke operated
Indication after operation
1
---- Th curr nt chamb r t mp ratur is
display d.
2
Pr ss num rical valu shift k y for
about 5 s conds. Th first digit is flash d.
3
Pr ss num rical valu shift k y
and scroll th figur to 2.. Th first digit is flash d.
4
Pr ss s t k y. SET Th first digit is flash d.
5
Scroll th figur to -05 by using
digit shift k y and num rical valu
shift k y
Wh n pr ss d, th figur of s ttabl
digit chang s.
Wh n pr ss d, th chang abl digit
mov s.
6
Pr ss s t k y. SET
Alarm t mp ratur is m moriz d and
th curr nt chamb r t mp ratur is
display d.
• Th s tting mod r turns to th t mp ratur display mod automatically wh n 90 s conds has pass d
without any k y op ration.

17
SETTING OF ALARM RESUME TIME
Th alarm buzz r is sil nc d by pr ssing alarm buzz r stop k y (BUZZER) on th control pan l during
alarm condition. (A r mot alarm is continuing th op ration.).
Th buzz r will b activat d again aft r c rtain susp nsion if th alarm condition is continu d. Th
susp nsion tim can b s t by following th proc dur shown in th Tabl 5 b low.
Th xampl in th tabl is bas d on th assumption that th d sir d duration is 20 minut s.
Note: Th duration is s t in 30 minut s at th factory.
Table 5. Setting procedure for alarm resuming time (change from 30 minutes to 20 minutes)
Description of operation Ke operated
Indication after operation
1
---- Th curr nt chamb r t mp ratur is
display d.
2
Pr ss digit shift k y for 5 s conds.
Th first digit is flash d.
3
S t th figur to F25 with th digit
shift k y and num rical valu shift
k y.
Th s ttabl digit is shift d.
Wh n pr ss d, th figur of s ttabl
digit chang s.
4
Pr ss s t k y. SET Th curr nt r sum tim is display d.
Th s cond digit is flash d.
5
S t th figur to 020 with th
num rical valu shift k y.
Wh n pr ss d, th figur of s ttabl
digit chang s.
6
Pr ss s t k y. SET
Th s tting is m moriz d and
th curr nt chamb r t mp ratur is
display d.
• Th s ttabl alarm r sum tim is 10, 20, 30, 40, 50, or 60 minut s (Th s tting is 010, 020, 030, 040,
050, or 060). Th buzz r would not r sum if th r sum tim is s t in 000.
• It is r comm nd d to s t th alarm r sum tim wh n th fr z r is not und r alarm condition. Th
s tting during alarm condition is ff ctiv on th n xt alarm condition.
• Th s tting cannot b chang d during pow r failur .
• Th s tting mod r turns to th t mp ratur display mod automatically wh n 90 s conds has pass d
without any k y op ration.

18
MONITOR OF FREEZER STATUS
Th fr z r has a function to monitor th running status of th unit as shown in tabl 6 b low. This is to
notic th running status g tting wors (not failur ).
1. Th status monitor lamp is lit wh n on of th running status shown in tabl 6 is d t ct d.
2. Th S cod (--X, X: 1 to 3) is display d on th t mp ratur indicator by pr ssing status k y (STATUS)
wh n th status monitor is lit.
3. Pr ssing th status k y (STATUS) again r turns to curr nt chamb r t mp ratur on th t mp ratur
indicator. (Th indication r turns to th chamb r t mp ratur display automatically wh n no k y is
op rat d for 90 s conds.)
Table 6. Monitor of running status
Kind of
function Status Indication If this status
continu s R m dy
Notic of
abnormal
ambi nt
t mp ratur
Wh n th ambi nt
t mp. is ov r approx.
35
o
C or low r than
about 0
o
C.
status lamp
lights.
“--1” is display d.
D cr as of cooling
p rformanc or
durability of
r frig rating circuit.
R ch ck air-
conditioning of
install d sit .
Notic of low
voltag
Wh n th pow r
sourc voltag is
l ss than approx.
195 V wh n th rat d
voltag is b tw n
220 and 240 V.
status lamp
lights.
“--2” is display d.
Abnormal h at at
pow r supply outl t
or d grad of
starting p rformanc
of r frig rating
circuit
Us d dicat d
pow r sourc .
Notic of
ov rload
condition
Wh n th running
rat of r frig rating
Circuit is high r than
usual.
status lamp
lights.
“--3” is display d.
D cr as of cooling
p rformanc or
durability of
r frig rating circuit.
1. This is lik ly to
happ n wh n a
larg amount of
mat rials is stor d.
2. Ch ck ambi nt
t mp., voltag , and
s aling of
out r/inn r door.
Note:
• Th S cod display d on th t mp ratur indicator is chang d v ry f w s conds if two or thr status
shown in th abov tabl ar d t ct d at th sam tim . （--1 ⇒ --2 ⇒ --3 ⇒ --1 r p at d）
• Th monitoring function do s not trigg r a buzz r or conduct a saf ty op ration.
• In th cas of multipl indication of S cod , follow th r m dy for ach status.
• Th status monitor lamp (STATUS) may b lit und r normal running condition wh n th small inn r door
(MDF-5ID or MDF-7ID) is install d b caus of l ss cooling p rformanc . In this cas , adjust th air
conditioning so that th ambi nt t mp ratur is around 23
o
C, or s t th chamb r t mp ratur 10
o
C high r
than th curr nt s tting.

19
SETTING OF COMPRESSOR DELAY TIME
Th d lay tim of high and low stag sid compr ssor can b chang d to r duc th load on th pow r
lin and to facilitat th start-up (r s t) of th fr z r aft r pow r failur .
Th xampl in th tabl 7 is bas d on th assumption that th d lay tim is chang d to 4 minut s.
(Th d lay tim is s t in 3 minut s at th factory.)
Note:
• Th d lay tim should b th sam for high stag sid and low stag sid compr ssors.
• Th s tting rang for d lay tim is b tw n 3 and 15 minut s. Th cool down of chamb r t mp ratur
may b slow wh n th s tting of d lay tim is ov r 5 minut s, d p nding on th installation nvironm nt.
Th r is no n d of changing th d lay tim wh n th capacity of pow r sourc is ad quat .
Table 7. Setting procedure for dela time (change from 3 minutes to 4 minutes)
Description of operation Ke operated
Indication after operation
1
---- Th curr nt chamb r t mp ratur is
display d.
2
Pr ss num rical valu shift k y for
5 s conds.
Th first digit is flash d.
3
S t th figur to F05 with th
num rical valu shift k y.
Wh n pr ss d, th figur of s ttabl
digit chang s.
4
Pr ss s t k y. SET Th curr nt d lay tim is display d.
Th first digit is flash d.
5
S t th figur to 004 with th
num rical valu shift k y. Wh n pr ss d, th figur of th first
digit chang s.
6
Pr ss s t k y. SET
Th d lay tim is m moriz d and
th curr nt chamb r t mp ratur is
display d.
• Th compr ssor starts to op rat with th d lay tim s t by th abov proc dur at th tim of pow r on
or aft r pow r failur . How v r, th start up of th low stag sid compr ssor is aff ct d by th chamb r
t mp ratur and th cascad cond ns r t mp ratur . Th d lay tim vari s d p nding on how th y
m t th start up conditions. It is mor than four minut s in cas of th abov xampl .
• Th s tting mod r turns to th t mp ratur display mod automatically wh n 90 s conds has pass d
without any k y op ration.