OPERATION MANUAL
Air cooled refrigeration condensing unit
LREQ15B7Y1R
LREQ20B7Y1R
WARNING
LREQ15B7Y1R
LREQ20B7Y1R
CONTENT
Air cooled refrigeration condensing unit
Operation manual
1. SAFETY PRECAUTIONS.......................................................... 1
2. NAME OF PART........................................................................ 3
In the case of LREQ15, LREQ20 ...........................................3
3. SYSTEM CONFIGURATION..................................................... 3
3-1 Air cooled condensing unit................................................. 3
3-2 Other configuration equipment........................................... 3
4. METHOD OF OPERATION/STOP ............................................ 3
5. BETTER USE ............................................................................ 3
5-1 Turn off the power.............................................................. 3
5-2 Install an alarm................................................................... 3
6. CARE AND CLEANING METHOD ............................................ 4
7. TROUBLESHOOTING .............................................................. 4
7-1 The following cases are not malfunctions. ......................... 4
7-2 Check before requesting servicing..................................... 4
7-3 Consult your dealer in the following cases......................... 4
8. INSPECTION............................................................................. 4
9. PRODUCT MODELS AND MAIN SPECIFICATIONS ............... 5
9-1 Models and Main Specifications. ....................................... 5
10. AFTER-SALE SERVICE............................................................ 6
10-1 After-sale service ............................................................... 6
10-2 Onerous repairs (Outside scope of warranty coverage) .... 6
The English text is the original instruction. Other languages are
translations of the original instructions.
Thank you for purchasing this Daikin condensing unit. Carefully read
this operation manual before using the condensing unit. It will tell you
how to use the unit properly and help you if any trouble occurs.
Important information regarding the refrigerant used
This product contains fluorinated greenhouse gases covered by the
Kyoto Protocol. Do not vent gases into the atmosphere.
Refrigerant type : R410A
(1)
value : 1975
GWP
(1)
GWP = global warming potential
(Values are indicated in F-gas Regulations, Appendix I, parts 1 and 2.)
Periodical inspections for refrigerant leaks may be required depending
on European or local legislation.
Please contact your local dealer for more information.
1. SAFETY PRECAUTIONS
To gain full advantage of the condensing unit’s functions and to avoid
malfunction due to mishandling, please read this operation manual
carefully before use.
This condensing unit is classified under “appliances not accessible to
the general public”.
•
The precautions described herein are classified as WARNING
and CAUTION. They both contain important information
regarding safety. Be sure to observe all precautions without fail.
WARNING ................ Failure to follow these instructions
properly may result in personal injury or
loss of life.
CAUTION ................. Failure to observe these instructions
properly may result in property damage
or personal injury, which may be serious
depending on the circumstances.
• After reading, keep this manual in a convenient place so that
you can refer to it whenever necessary. If the equipment is
transferred to a new user, be sure also to hand over the
manual.
Be aware that prolonged, direct exposure to cool or warm air
from the air conditioner, or to air that is too cool or too warm
can be harmful to your physical condition and health.
When the condensing unit is malfunctioning (giving off a
burning odour, etc.) turn off the power to the unit and
contact your local dealer.
Continued operation under such circumstances may result in a
failure, electric shocks or fire hazards.
Consult your local dealer about installation work.
Doing the work yourself may result in water leakage, electric
shocks or fire hazards.
Consult your local dealer regarding modification, repair and
maintenance of the condensing unit.
Improper workmanship may result in water leakage, electric
shocks or fire hazards.
Do not place objects, including rods, your fingers, etc., in the
air inlet or outlet.
Injury may result due to contact with the condensing unit’s
highspeed fan blades.
Never touch the air outlet or the horizontal blades while the
swing flap is in operation.
Fingers may become caught or the unit may break down.
Beware of fire in case of refrigerant leakage.
If the condensing unit is not operating correctly (i.e. the interior
temperature of the condensing unit does not drop efficiently),
refrigerant leakage could be the cause.
Consult your dealer for assistance.
The refrigerant used for the condensing unit is safe and normally
does not leak.
However, if the refrigerant leaks and gets in contact with a naked
burner, heater or cooker, it may generate hazardous compounds.
Turn off the condensing unit and call the dealer. Make sure to turn
on the condensing unit after the qualified service person confirms
that the leakage is repaired.
Consult your local dealer regarding what to do in case of
refrigerant leakage.
When the condensing unit is to be installed in a small room, it is
necessary to take proper measures so that the amount of any
leaked refrigerant does not exceed the concentration limit in the
event of a leakage. Otherwise, this may lead to an accident due
to oxygen depletion.
Contact professional personnel about attachment of
accessories and be sure to use only accessories specified
by the manufacturer.
If a defect results from your own workmanship, it may result in
water leaks, electric shock or fire.
Consult your local dealer regarding relocation and
reinstallation of the condensing unit.
Improper installation work may result in leakage, electric shocks
or fire hazards.
Be sure to use fuses with the correct ampere reading.
Do not use improper fuses, copper or other wires as a substitute,
as this may result in electric shock, fire, injury or damage to the
unit.
Be sure to install an earth leakage breaker.
Failure to install an earth leakage breaker may result in electric
shocks or fire.
Be sure to earth the unit.
Do not earth the unit to a utility pipe, lightning conductor or
telephone earth lead. Imperfect earthing may result in electric
shocks or fire.
A high surge current from lightning or other sources may cause
damage to the condensing unit.
Consult the dealer if the condensing unit submerges owing to
a natural disaster, such as a flood or typhoon.
Do not operate the condensing unit in that case, or otherwise a
malfunction, electric shock, or fire may result.
Start or stop the air conditioner with the remote controller.
Never use the power circuit breaker for this purpose.
Otherwise, it may cause fire or water leakage.
Furthermore, because power failure compensation is set, the fan
will rotate abruptly, which may result in injury.
Do not use the product in the atmosphere contaminated with
oil vapor, such as cooking oil or machine oil vapor.
Oil vapor may cause crack damage, electric shocks, or fire.
Operation manual
1
Air cooled refrigeration condensing unit
LREQ15+20B7Y1R
4P362763-1B – 2014.01
Do not use the product in places with excessive oily smoke,
CAUTION
such as cooking rooms, or in places with flammable gas,
corrosive gas, or metal dust.
Using the product in such places may cause fire or product
failures.
Do not use flammable materials (e.g., hairspray or insecticide)
near the product.
Do not clean the product with organic solvents such as paint
thinner.
The use of organic solvents may cause crack damage to the
product, electric shocks, or fire.
Do not keep in the unit anything volatile or flammable.
Doing so may result in explosion or fire.
Be sure to use a dedicated power supply for the condensing
unit.
The use of any other power supply may cause heat generation,
fire, or product failures.
Consult your dealer regarding cleaning the inside of the
condensing unit.
Improper cleaning may cause breakage of plastic parts, water
leakage and other damage as well as electric shocks.
Do not use the condensing unit for purposes other than
those for which it is intended.
Do not use the condensing unit for cooling precision instruments,
works of art as this may adversely affect the performance, quality
and/or longevity of the object concerned.
Do not use the unit for water cooling use.
Freezing may result.
Do not remove the unit’s fan guard.
The guard protects against the unit’s high speed fan, which may
cause injury.
Do not locate around the unit anything that must stay dry.
Doing so may wet the area resulting from condensed water from the
unit.
After prolonged use, check the unit stand and its mounts for
damage.
If left in a damaged condition, the unit may fall and cause injury.
Do not place flammable sprays or operate spray containers
near the unit as this may result in fire.
Do not put flammable containers, such as spray cans, within
1 m from the air outlet.
The containers may explode because the warm air output of the
indoor or outdoor unit will affect them.
Before cleaning, be sure to stop unit operation, turn the
power circuit breaker off or remove the power cord.
Otherwise, an electric shock and injury may result.
To avoid electric shocks, do not operate with wet hands.
Do not allow a child to mount on the outdoor unit or avoid
placing any object on it.
Falling or tumbling may result in injury.
Do not wash the condensing unit with water, as this may
result in electric shocks or fire.
Do not place water containers (flower vases, flowerpot, etc.)
on the unit, as this may result in electric shocks or fire.
Do not install the condensing unit at any place where there is
a danger of flammable gas leakage.
In the event of a gas leakage, build-up of gas near the condensing
unit may result in fire hazards.
Perform drain piping to ensure perfect drainage.
Imperfect drainage may result in water leakage.
The appliance is not intended for use by unattended young
children or persons who are incompetent to operate
condensing unit.
It may result in injury or electric shock.
Children should be watched so that they do not play with the
unit.
Accidental operation by a child may result in injury or electric shock.
To avoid injury, do not touch the air inlet or aluminium fins of
the unit.
Do not place objects in direct proximity of the condensing
unit and do not let leaves and other debris accumulate
around the unit.
Leaves are a hotbed for small animals which can enter the unit.
Once in the unit, such animals can cause malfunctions, smoke or
fire when making contact with electrical parts.
Do not block air inlets nor outlets.
Impaired airflow may result in insufficient performance or trouble.
Do not let children play on or around the outdoor unit.
If they touch the unit carelessly, injury may be caused.
Turn off the power when the unit is not to be used for long
periods of time.
Otherwise, the unit may get hot or catch on fire due to dust
accumulation.
Do not touch the aluminium fin directly at the time of
cleaning.
Doing so may result in injury.
[Installation site]
Is the unit installed in a well-ventilated place with no obstacles
around?
Do not use the product in the following places.
a. Places with mineral oil, such as cutting oil.
b. Places directly exposed to seawater spray and briny air.
c. Places where sulphide gas is generated, such as hot springs.
d. Places with radical voltage fluctuations, such as factories.
e. In vehicles or on board ships.
f. Places with sprays of oil or excessive steam, such as kitchens.
g. Places with machines generating electromagnetic waves.
h. Places with acid gas, alkaline gas, or steam.
i. Places with poor drainage.
j. Places in potentially explosive atmosphere.
Install the unit, power supply wiring, transmission wiring and
refrigerant piping at least 1.5 meter away from televisions,
radios and stereo sets.
Otherwise, the picture and sound may be interfered with noise.
Are snow protection measures taken?
For detailed arrangements, such as the installation of a snow
protection hood, consult your dealer.
Is there no clearance around the through hole between the
internal and external units?
The chilled air will leak from the clearance and the cooling efficiency of
the unit will be degraded.
Is service space secured?
If the target evaporating temperature is ≤–20°C, adding refrigerant oil
may be required. Failure to do so may lead to compressor
malfunction. If you change the target evaporating temterature from
≥–20°C to ≤–20°C, it may also be required to add refrigerant oil. In this
case, contact your dealer.
After refrigerant oil has been added, the target evaporating
temperature cannot be changed to ≥–20°C.
Refer to the installation manual for more information.
[Electrical work]
Do not attempt to conduct electrical work or grounding work
unless you are licensed to do so.
Consult with your dealer for electrical work and grounding work.
Check that the power supply is suitable to the unit and that an
exclusive circuit is provided to the unit.
Check the electric capacity and voltage.
Refer to the installation manual for more information.
[Refrigerant]
• This product contains fluorinated gases covered by the Kyoto
protocol.
Type of refrigerant: R410A, GWP value: 1975
Periodical inspections on refrigerant leakages may be required
depending on European or local legislation. Please contact your
installer for more information.
• The total maximum refrigerant charge of a Multi-ZEAS system
must be less than 100 kg, this to be in accordance with CE
requirements (EN603350-2-40 standard). This means that in case
the calculated total refrigerant charge is equal to or more than
95 kg you must divide your multiple outdoor system into smaller
independent systems, each containing less than 95 kg refrigerant
charge.
LREQ15+20B7Y1R
Air cooled refrigeration condensing unit
4P362763-1B – 2014.01
Operation manual
2
2. NAME OF PART
CAUTION
Air outlet
Fan
Air inlet
Heat exchanger
(aluminium fin)
Transmission
wiring
Refrigerant
piping
Earth wire
A wire that makes the system
safe by connecting the outdoor
unit to the ground for the
prevention of electric shocks
or fire resulting from electric
leakage.
Power supply wires
(to dedicated earth
leakage breaker)
OFF
REMOTE
ON
OFF
REMOTE
ON
OFF
In the case of LREQ15, LREQ20
4. METHOD OF OPERATION/STOP
Preparations
• Turn on all the configuration
equipment.
• Be sure to turn on the power at least 6
hours before starting the operation of
the equipment for the machinery
protection.
1. Set the operation switch of the master unit to ON.
Stop
2. Set the operation switch of the master
unit to OFF.
To start operation
To stop operation
3. SYSTEM CONFIGURATION
The condensing unit has the following system configuration.
3-1 Air cooled condensing unit
Name Master unit Slave unit
Shape
3-2 Other configuration equipment
Indoor unit
Name
Unit cooler Showcase
Shape
Name
Unit cooler Showcase
Shape
For other configuration equipment, refer to the Operation
Manuals of the respective pieces of equipment.
Refrigeration
Indoor unit
Freezing
Defrost control
panel
The unit must go through a stop movement before the unit is
turned power off.
Be sure to turn off the breaker after the operation switch is turned
off. It is not possible to start and stop the system by operating the
operation switch of the slave unit.
Note:
• The use of a remote switch is recommended if the operation of the
unit is stopped frequently.
Request your dealer for the installation of the remote switch.
5. BETTER USE
5-1 Turn off the power if the unit is not operated for
a long time.
The unit will consume a power of several watts to several tens
of watts if the power is on (see note).
For the purpose of machine protection, however, be sure to turn
on the power at least 6 hours before resuming the operation of
the unit.
Note: The power consumption of the unit varies with the
operating factors, such as the condensing unit model.
5-2 Install an alarm if operational errors are likely
to degrade the commodities in storage.
The unit is provided with a terminal to output an alarm signal.
If the system should malfunction and there is no alarm, the
operation of the unit will be interrupted for a long time and
damage to the commodities in storage may result.
The installation of an alarm is recommended in order to take
appropriate measures promptly in such cases.
For details, consult your dealer.
Operation manual
3
Air cooled refrigeration condensing unit
LREQ15+20B7Y1R
4P362763-1B – 2014.01
6. CARE AND CLEANING METHOD
CAUTION
WARNING
Ta b
Trip position
ON
OFF
Be sure to stop the operation of the unit with the operation switch
and turn off the power (i.e., turn off the earth leakage breaker)
before starting the maintenance of the unit.
Do not touch the aluminium fin directly at the time of
cleaning.
Doing so may result in injury.
Do not wash the condensing unit with water, as this may
result in electric shocks or fire.
Before cleaning, be sure to stop unit operation, turn the
power circuit breaker off or remove the power cord.
Otherwise, an electric shock and injury may result.
7-2 Check before requesting servicing.
1. The unit does not operate at all.
• Has the power supply fuse not blown out?
Turn off the power. (Consult your dealer for the replacement of
the power supply fuse.)
• Is the power circuit breaker not turned off?
Turn on the power if the knob of the power circuit breaker is set
to the OFF position.
Do not turn on the power if the knob of the power circuit breaker
is set to the trip position. (Consult your dealer.)
• Request your dealer for heat exchanger cleaning periodically.
7. TROUBLESHOOTING
7-1 The following cases are not malfunctions.
1. The unit does not operate.
• The unit is restarted immediately after the unit comes to a stop.
The unit is under control in order not to impose a heavy duty on
the machinery parts. The operation of the unit will start in 1 to 5
minutes.
• The unit has been just turned on.
The microprocessor requires preparations. Wait for
approximately two minutes.
2. The unit does not come to a stop.
• The operation switch was turned off a while ago.
The unit operates for a while before the unit comes to a stop in
order to protect the machinery parts. The unit will come to a stop
after the operation is over.
3. The unit generates noise.
• The unit in cooling operation generates low hissing sound
continuously.
This is the sound of gas (refrigerant) flowing in the condensing
unit.
• The unit generates hissing sound immediately after the unit
starts operating or comes to a stop.
This is the sound of gas (refrigerant) flowing.
• The unit rattles when the unit is operated and stopped
repeatedly.
This is the sound of gas (refrigerant) flowing inside the
condensing unit.
4. The outdoor fan does not rotate.
• The unit is in operation.
The fan is under RPM control in order to maintain the optimum
operation of the product.
5. Neither the compressor of the outdoor unit nor the outdoor
fan comes to a stop.
• The phenomenon occurs after the unit comes to a stop.
The compressor and outdoor fan continue operating in order to
prevent the detention of refrigerant oil and refrigerant. They will
come to a stop in about 5 to 10 minutes.
Power circuit breaker
(earth leakage breaker)
• Is there no blackout?
Wait until power is restored. If power failure occurs during
operation, the system automatically restarts immediately after
the power supply is recovered.
• Are all the power supplies turned on?
Turn all the power on.
2. The unit comes to a stop soon after the unit starts operating.
• Do obstacles not block the air inlet or outlet of the outdoor unit
or indoor unit?
Remove the obstacles.
3. The cooling operation of the unit is bad.
• Does the indoor unit (unit cooler and showcase) not have much
frost?
Defrost manually or shorten the cycle of defrosting operation.
• Are there not too many articles inside?
Reduce the number of articles.
• Is the circulation of cold air in the indoor unit (unit cooler and
showcase) smooth?
Change the allocation of the articles.
• Is there not much dust on the heat exchanger of the outdoor
unit?
Remove the dust with a brush or vacuum cleaner without using
water or consult your dealer.
• Is cold air not leaking outside?
Stop the leakage of cold air.
• Is the set temperature in the indoor unit (unit cooler and
showcase) not too high?
Set the temperature appropriately.
• Are high-temperature articles not stored?
Store them after they are once cooled off.
• Is the opening time of the door not long?
Minimize the opening time of the door.
7-3 Consult your dealer in the following cases.
When the condensing unit is malfunctioning (giving off a
burning odor, etc.) turn off the power to the unit and contact
your local dealer.
Continued operation under such circumstances may result in a
failure, electric shocks or fire hazards.
LREQ15+20B7Y1R
Air cooled refrigeration condensing unit
4P362763-1B – 2014.01
1. Safety devices, such as the fuse, breaker, and earth leakage
breaker, frequently operate or the operation of the operation
switch is not stable.
Contact your dealer after turning the power off.
2. Turn off the power and consult your dealer if symptoms other
than the above are noticed or the equipment does not go into
normal operation after taking the steps specified in 7-2.
8. INSPECTION
The preventive maintenance of the unit is required in order not to
damage commercial products. Request a contractor authorized
by our dealer for inspection.
Refer to information on "Maintenance inspection" on page 6 for
maintenance inspection.
Operation manual
4
9. PRODUCT MODELS AND MAIN SPECIFICATIONS
9-1 Models and Main Specifications.
Note:
*1. Values are subject to change without notice for product improvements.
*2.
When the outdoor temperature is low, the temperature reading may be below the target evaporating temperature set for the protection of the unit.
*3. The sound pressure level is less than 70 dB(A).
Model
LREQ30BY1 LREQ40BY1
LREQ15B7Y1R LREQ15B7Y1R LREQ20B7Y1R LREQ20B7Y1R
Power supply 3 phase 50 Hz 380–415 V
Refrigerant R410A
Operating
condition
Evaporating temperature –45°C~+10°C
Outdoor temperature –20°C~+43°C
Outer dimensions (H×W×D) (mm)
1680 ×
1240 × 765
1680 ×
1240 × 765
1680 ×
1240 × 765
1680 ×
1240 × 765
Product mass 331 kg 331 kg 337 kg 337 kg
Connecting
refrigerant piping
Liquid pipe Ø19.1
Gas pipe Ø41.3
Design pressure
High-pressure side
(bar)38383838
(MPa) 3.8 3.8 3.8 3.8
Low-pressure side
(bar)25252525
(MPa) 2.5 2.5 2.5 2.5
Operation manual
5
Air cooled refrigeration condensing unit
LREQ15+20B7Y1R
4P362763-1B – 2014.01
10. AFTER-SALE SERVICE
10-1 After-sale service
WARNING
Consult your local dealer regarding modification, repair and
main
tenance of the condensing unit.
Improper workmanship may result in water leakage, electric shocks
or fire hazards.
Consult your local dealer regarding relocation and
reinstallation of the condensing unit.
Improper installation work may result in leakage, electric shocks or
fire hazards.
Beware of fire in case of refrigerant leakage.
If the condensing unit is not operating correctly (i.e. the interior
temperature of the condensing unit does not drop efficiently),
refrigerant leakage could be the cause.
Consult your dealer for assistance.
The refrigerant used for the condensing unit is safe and normally
does not leak.
However, if the refrigerant leaks and gets in contact with a naked
burner, heater or cooker, it may generate hazardous compounds.
Turn off the condensing unit and call the dealer. Make sure to turn
on the condensing unit after the qualified service person confirms
that the leakage is repaired.
1. Inform your dealer of the following items when you request
repairs.
• Model name Described in the warranty card.
• Serial number and date of installation
Described in the warranty card.
• Defective condition
• Your address, name, and telephone number
2. Repairs after expiration of warranty period
Consult your dealer. Onerous repairs will be possible if the unit
can maintain its original functions after the repairs are made.
3. Maintenance inspection
The interior of the refrigeration condensing unit will become dirty
and its performance may be degraded if it is used for several
seasons.
The disassembly and internal cleaning of the unit requires
specialized techniques. Therefore, our dealer recommends an
onerous maintenance inspection besides usual maintenance
services.
For details, consult your dealer.
Keep in mind that our dealer’s warranty may not cover
malfunctions resulting from the disassembly or internal cleaning
of the unit conducted by contractors not authorized by our dealer.
4. Relocation and disposal
• Contact your dealer for removing and reinstalling the system
condensing unit since they require technical expertise.
• The system condensing unit uses fluorocarbon refrigerant.
Contact your dealer for discarding the system condensing unit
since it is required by law to collect, transport and discard the
refrigerant in accordance with relevant local and national
regulations.
• In either case, consult your dealer.
5. Inquiries
Contact your dealer for after-sale services.
–
as precise as possible
10-2 Onerous repairs
(Outside scope of warranty coverage)
10-2-1 Accidents resulting from use beyond standards
for use
• Use beyond Limits
•
Applications other than its designed purpose of use or modification.
Standards for use
Condensing unit
Item Standard for use
Refrigerant R410A (*5)
Refrigeration oil Daphne FVC68D (*6)
Range of evaporating
temperature (Te)
Range of outdoor temperature –20°C ~ +43°C (*4)
Suction gas superheated degree 10 K or higher (*7)
Suction gas temperature 20°C or lower
Voltage
regulation
Power supply
Compressor ON/OFF frequency 6 times or less/hour
Connection piping length
(equivalent piping length) (*1)
Max. difference in height
between indoor and outdoor
units
Installation space
Total indoor unit capacity
Outdoor unit multi-connection
piping kit
Restrictions for the refrigeration-side Note:
Connectable
minimum load
capacity
Liquid solenoid
valve installed
upstream of
expansion valve
Defrost method
Restrictor Use a thermal expansion valve for R410A
Voltage
imbalance
rate
Frequency
regulation
4.0 kW (Te ≥ –20)
3.2 kW (Te < –20)
For R410A, maximum operating pressure
difference: 3.5 MPa or higher
It is necessary to control the solenoid
valves in indoor unit using “Operate unit” of
outdoor unit
Hot gas defrost not possible
After defrosting ends, resume operation of
the refrigeration-side blower within 3
minutes or less
–45°C ~ +10°C (*2)(*8)
within ±10% of rated
voltage
within ±2% of rated voltage
within ±2% of rated
frequency
130 m or lower
(Te ≥ –20)
100 m or lower
(Te < –20)
35 m or lower (*3)
(When the condensing unit
is installed higher than the
refrigeration-side)
10 m or lower
(When the condensing unit
is installed lower than the
refrigeration-side)
According to the
installation service space
Starting from an outdoor
temperature of 32°C, the
total indoor unit capacity
needs to be ≥50% of the
total outdoor unit capacity
To split up the gas piping
and connect it to the
different outdoor units, the
use of the outdoor unit
multi-connection piping kit
(EKHRQZM) is required
LREQ15+20B7Y1R
Air cooled refrigeration condensing unit
4P362763-1B – 2014.01
Operation manual
6
*1. Connection piping length differs according to set value of
Inlet
(upper side)
Outlet
(lower side)
Heat exchanger
evaporating temperature. The total internal volume of the
connected indoor units may not exceed 80 l.
*2. When the outdoor temperature is lower than evaporating
temperature, evaporating temperature is lower than set
evaporating temperature
*3. Trap is required at 5 m intervals from outdoor unit.
*4. If the outdoor units are installed in a location where the ambient
temperature can drop below –10°C, install a windbreak board or a
snowbreak hood. Refer to the service manual for more details.
*5. Only use refrigerant R410A.
*6. Only use the refrigerant oil listed in the Daikin service parts list.
*7. Also applies to post-defrost operation.
*8. If the target evaporating temperature is ≤–20°C, adding refrigerant
oil may be required.
10-2-2 Selection, installation, work failures specified
below and other failures
Note: Asterisk-marked items show concrete examples.
1. Model selection failures
• A model not suitable for storage applications is selected.
* The cooling of products not reaching the target storage
temperatures.
• Cooling overloading or underloading judged by our dealer.
* The frequency of stoppage is 6 or more times per hour or the
set cooling temperature is not attained.
2. Installation failure (installation and environmental problems)
• The unit is not installed on a stable horizontal plane.
* The unit is not fixed securely.
• The environmental conditions of the place of installation differ
from normal atmospheric conditions.
* Briny air environment, shore side, oil mist environment,
kitchen exhaust side, other corrosive gas and adhesive mist
environment.
• The place of installation had poor ventilation and heat
dissipation.
* The machine took in exhausted air again.
• The required outdoor unit multi-connection piping kit was not
used.
• The required windbreak board or snowbreak hood was not
installed in case of outdoor temperatures ≤–10°C.
• The instructions outlined in the installation manual were not
followed correctly.
3. Work failure
• The interior of the piping was not vacuum dried sufficiently.
* The clogging of the thin areas of the piping caused by icing.
• The interior of the piping was not sufficiently airtight.
* Leakage of refrigerant gas.
• The interior of the piping was contaminated with foreign
substance.
* The clogging of the thin areas of the piping.
• The unit was adversely affected by on-site modification work.
The use of the unit beyond the operating temperature range as a
*
result of on-site modification.
• An accident resulted from the improper handling of the unit
under installation work.
* The loosening or wobbling of the outer panel or broken or bent
damage to the piping.
* The instructions regarding the addition of refrigerant oil were
not followed correctly.
* Too much or too few refrigerant was charged into the system.
4. Operational failure
• Temperature settings for stored objects were wrong.
* The storage of vegetables at temperatures below 0°C.
• The periodical maintenance of the unit was neglected.
* The clogging of the air heat exchanger, rust generation from
each part, gas leakage, and icing of the indoor unit (showcase
and unit cooler).
• The following instructions regarding the addition of refrigerant
oil where not followed correctly.
* If the target evaporating temperature is ≤–20°C, adding
refrigerant oil may be required.
* After refrigerant oil has been added, the target evaporating
temperature cannot be changed to ≥–20°C.
* If the target evaporating temperature is lowered by 5°C
(starting from a target evaporating temperature of ≤–20°C), it
is required to recalculate the amount of refrigerant oil and
add more if necessary.
5. Others
• Improvements recommended by our dealer in advance were
not accomplished.
* The simultaneous starting and stopping of a number of units.
• Accidents were caused by natural disaster or fire.
Damage to electrical parts caused by lightning.
*
• There were other installation and operational problems beyond
common sense.
* The use of the unit without heat insulation work on the piping.
• Work was conducted without keeping the following showcase
restrictions.
<Showcase restrictions>
· The installation of the thermostatic expansion valve and
liquid supply solenoid valve (both of which are for R410A) on
a showcase basis.
Thermal insulation of feeler tube of thermostatic expansion
valve must be thermal insulated.
Install showcases on the same floor if the showcases are
·
connected to a single outdoor unit.
· Make sure that the outlet of piping used for the heat
exchanger is located downward (as shown on the following
figure).
Operation manual
7
Air cooled refrigeration condensing unit
LREQ15+20B7Y1R
4P362763-1B – 2014.01
*4P362763-1 B 0000000+*
4P362763-1B 2014.01
Copyright 2013 Daikin
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