Mitsubishi Electric VL-250CZPVU-R-E User manual

Eng-1
English
Contents
1. Safety Precautions ……………………… 2
2. Features ………………………………… 4
3. Preparations Before Use ……………… 5
4. Names and Functions of Parts ………… 6
5. How to Use ……………………………… 7
6. Maintenance …………………………… 17
7. Troubleshooting ……………………… 19
8. Specications ………………………… 21
9. After-Sales Service …………………… 21
LOSSNAY HEAT RECOVERY VENTILATOR (RESIDENTIAL USE)
MODEL
VL-250CZPVU-R-E
VL-250CZPVU-L-E
VL-350CZPVU-R-E
VL-350CZPVU-L-E
Instruction Manual For user
* The gure shows VL-350CZPVU-R-E
Do not attempt to install the product by yourself. (Safety and proper functions of the product may not be
assured.)
■This product is for residential use.
■To ensure correct and safe use, read the instruction manual thoroughly.
Before using the product, check Safety Precautions to use it correctly and safely.
■After reading, store the manual in a handy location for easy access.

Eng-2
1. Safety Precautions
WARNING
Prohibited
Donotturnonoro󰀨thecontrollerwhencorrosivegashasleaked.
Sparks from electric contacts may cause the gas to explode.
Donotusetheproductinhotplaces,inthedirectsunlightandinsmokyplaces.
Failure to heed this warning may result in re.
No disassembly
Donotmodifyordisassembletheproductusingtools.
Failure to heed this warning may result in re, electric shock or injury.
No water exposure
Refrainfromimmersinginwaterorsplashingtheproductwithwater.
Failure to heed this warning may result in re or electric shock.
Cannot be installed
in a bathroom
Makesurethattheproductandthecontrollerisnotinstalledatabathroomorotherhumid
location.
Failure to heed this warning may result in electric shock or injury.
The product must
be grounded
Makesurethattheproductisgrounded.
Device failure and electric leakage may cause electric shock.
Aboutinstallingaground,contactyourdealeroranelectricalcontractor.
Follow
instructions
Use220to240VACpower.
Failure to heed this warning may result in re, electric shock or damage to the circuit boards.
Makesurethattheoutdoorairintakeventislocatedatapositionwherecombustiongasor
othersimilargasesisnotsuckedin.
Inability to bring in fresh air may result in lack of oxygen in the room.
Makesuretoturno󰀨theisolatorbeforecleaningandmaintenance.
Failure to heed this warning may result in electric shock or injury.
Ifanabnormalityoccurs(forexample,whenyousmellburning),stopoperation,andturno󰀨
thecircuitbreakeronthepowerboard.
If operation of the product is continued in this state, this may result in malfunction, electric shock or re.
If an abnormality or malfunction occurs, immediately stop use of the product.
Continued use of the product in this state may result in smoking, ignition re, electric shock, or injury.
Contactanelectricalcontractortoworkelectricalwiring.
Incorrectly electrical work may result in electric shock.
Makesurethatanoutdoorhood,thatmakesitlesslikelyforrainwater,snoworsmallanimals
(forexample,bats)fromentering,isinstalledattheendsofsupplyairandexhaustducts.
Failure to heed this warning may cause rain penetration, resulting in electric shock/re or water
damage to household property.
Iftheproductwillnotbeoperatedforalongperiodoftime,makesuretoturno󰀨thecircuit
breakeronthepowerboard.
Failure to heed this warning may result in electric shock due to deteriorated insulation or re due to
electric leakage.
The following symbols denote the type and degree of
danger resulting from incorrect handling.
WARNING
Incorrect handling of the
product may result in
serious injury or death.
CAUTION
Incorrect handling of
the product may result
in injury or damage to
property or household
e󰀨ects.
Symbols used in the text and on the main unit have the
following meanings.
Prohibited Cannot be installed in
a bathroom
No disassembly The product must be
grounded
No water exposure Follow instructions

Eng-3
CAUTION
Prohibited
Donotusetheproductatlocationswheretoxicgasorgascontainingcorrosivecomponents
suchasacids,alkaline,organicsolvents,orpaintsisgenerated.
Failure to heed this warning may result in malfunction.
Duringcleaningandmaintenance,donotclimbonanunstablestand.
Injury may result if you tumble down.
Do not use aerosol sprays (such as insect sprays, hair sprays or cleaners) on such as the
unit.
Failure to heed this warning may result in deterioration and damage to the parts.
Follow
instructions
Makesurethattheproductisinstalledhorizontally.
Water leakage may result in damage to property or household e󰀨ects, and injury may result if the
product should fall.
Makesurethatdrainpipingisinstalledatthedischargeoutlet.
Wearglovesduringcleaningandmaintenance.
Failure to heed this warning may result in injury.
Whenremovingtheoutdoorairltercaseandexhaustltercase,dewcondensationwater
thathasbuiltupindoorsometimesdrips.So,removetheltercasesgentlybysupporting
themwithbothhandssothattheyarenottilted.
Securelyinstallthepartsaftercleaningandmaintenance.
Injury may result if the parts should fall.
Thisapplianceisnotintendedforusebypersons(includingchildren)withreducedphysical
sensoryormentalcapabilities,orlackofexperienceandknowledge,unlesstheyhavebeen
givensupervisionorinstructionconcerninguseoftheappliancebyapersonresponsiblefor
theirsafety.Childrenshouldbesupervisedtoensurethattheydonotplaywiththeappliance.
(Thisappliancecanbeusedbychildrenagedfrom8yearsandaboveandpersonswith
reducedphysical,sensoryormentalcapabilitiesorlackofexperienceandknowledgeifthey
havebeengivensupervisionorinstructionconcerninguseoftheapplianceinasafewayand
understandthehazardsinvolved.Childrenshallnotplaywiththeappliance.Cleaningand
usermaintenanceshallnotbemadebychildrenwithoutsupervision.)
Requests on Use
- When this product ventilates, it takes in cold air from the outdoor in winter. For this reason, when the outdoor air
temperature drops, moisture in the air around the product condensates, and water drops sometimes adhere to
the product or drop. This, however, is not a malfunction. Wipe o󰀨 any water droplets.
- When outdoor air temperatures are low and operation of the product is stopped, operation of the ventilator
or pressure of the outdoor wind might cause outdoor air to ow in from the product, which may result in dew
condensation forming on the product and other parts. This is not a malfunction. Wipe o󰀨 any water droplets.
- When a lot of humidity is generated from building materials at newly built houses, dew condensation may occur
on the product and other parts. This is not a malfunction. Wipe o󰀨 any water droplets.
- When a strongly fragrant scent, etc. is used in toilets, bath rooms and wash basins, or when cigarette or other
smoke is discharged, odor is sometimes sense from the air vent.
- When ventilating a bathroom and living room etc. , operate the product for 24 hours.
- Do not stop operation except in the following instances. (Resume operation after the product has been
temporarily stopped.)
- When there is heavy snow, strong winds or heavy rain such as snowstorms or typhoons
- When there is thick fog
- During cleaning and maintenance
- When a lot of humidity is generated from building materials at newly built houses, dew condensation may form
on the product and other parts. So, switch the operation mode to temporarily stop operation, and open the
windows.
1. Safety Precautions (continued)

Eng-4
2. Features
What is the LOSSNAY HEAT RECOVERY VENTILATOR…?
■
E󰀨ective ventilation routes can be achieved in the entire house by the supply air vent and the exhaust vent
being installed at locations away from each other depending on the duct connection method.
■
Built-in lters reduce the inux of dust, pollen, etc, in outdoor air before the air is supplied to rooms.
Heatexchangeoperation
Dirty air from the room is discharged (=exhaust), and clean air from the outdoor is taken into the room (=air supply).
During this time, air is discharged and taken in through the Heat exchanger. As a result, air is ventilated while
reusing (heat collection) the warmth or coolness of the room which is discarded during ventilation.
■
When air conditioning is used in summer and winter, heat exchange ventilation reduces the load placed on air
conditioning to ensure energy savings.
Bypass operation
When exhaust and air supply are performed, air is supplied to the room without any change in the outdoor air
temperature due to exhaust being performed without passing through the Heat exchanger.
■
In spring and fall, and summer nights, for example, the cool air of the outdoor is taken in.
* The gure shows VL-350CZPVU-L-E
Air supply
Dirty air from the room
Damper
Exhaust
Clean air from outdoor
RA
(return air)
Heat exchanger
EA
(exhaust air) SA
(supply air)
OA
(outdoor air)
Note
-Ventilationisconductedattheventilationairvolume(BaseNotch)requiredfortheresidence.
-BysettingtoBoost/Purge,theventilationairvolumeisincreasedtemporarytoquicklyventilatetheair.
-Inthelongabsence,usetheHolidaymodetosaveenergybyreducingthefanoutput.

Eng-5
3. Preparations Before Use
■Receiveanexplanationaboutoperationproceduresandthecorrectmethodofusetoensuresafe
operation.
Make sure that commissioning and operation checks described in the Installation Manual have been carried out.
■Checkthepositionsandoperationmethods.
1) Inspection space:
It is required for maintenance on the product.
The product requires maintenance (regular lter cleaning, internal motor replacement, etc.).
If the product position is out of the specied dimensions as a result of checking the inspection layout drawing
described in the Installation Manual section 3.2 Working space, contact a distributor or an electrician.
2) Grills:
They are required on the supply air and exhaust sides of the product.
To reduce the frequency of cleaning the lters on the product, we recommend using a lter for taking up dust in
the room in the exhaust grill.
3) Controller:
It is required for starting and stopping operation of the product and for switching the fan speed.
Please see section 5. How to use.
Note
- The product is not an air-conditioner.
-Werecommendlocalventilationfordischargecigarettesmoke,etc.
-Werecommendinstallingbedsawayfromthesupplyairvent.(Duringsleep,youmaybebotheredbythe
operatingsoundoftheproductorfeelcoldair.)

Eng-6
4. Names and Functions of Parts
- On L-type (for example, VL-350CZPVU-L-E),
lters, controller and name plate are on the
reected positions.
* The gure shows VL-350CZPVU-R-E
18
2
9
310
511
6
7
No. Name Function
1Exhaust air lter It prevents heat exchanger from clogging.
2Exhaust air lter case It holds the exhaust air lter
3Optional air lter case For optional lter*
4Filter cover -
5Drain pipe attachment It is connected to drain pipe.
6Control box It holds circuit board
7Name plate It shows product name and serial No.
8Outdoor air lter It removes insects, pollen, dirt, dust, and other particles from the outdoor air
that is taken into the room.
9Outdoor air lter case It holds the outdoor air lter.
10 Heat exchanger It exchanges heat between the supply air and the return air.
11 Controller Product operation, See section 5.
* Optional lter
Filter name MODEL Applicable model Location to use
Replacement lter
P-250F-E VL-250CZPVU-R-E/VL-250CZPVU-L-E
RA, OA
L Type
R Type
RA: Return Air
OA: Outdoor Air
SA: Supply Air
P-350F-E VL-350CZPVU-R-E/VL-350CZPVU-L-E
Standard lter
P-250SF-E VL-250CZPVU-R-E/VL-250CZPVU-L-E
RA, OA, SA
P-350SF-E VL-350CZPVU-R-E/VL-350CZPVU-L-E
Medium e󰀩ciency lter
P-250MF-E VL-250CZPVU-R-E/VL-250CZPVU-L-E
RA, OA, SA
P-350MF-E VL-350CZPVU-R-E/VL-350CZPVU-L-E
PM2.5 lter
P-250PF-E VL-250CZPVU-R-E/VL-250CZPVU-L-E
RA, OA, SA
P-350PF-E VL-350CZPVU-R-E/VL-350CZPVU-L-E
NOx lter
P-250NF-E VL-250CZPVU-R-E/VL-250CZPVU-L-E
SA
P-350NF-E VL-350CZPVU-R-E/VL-350CZPVU-L-E
* When a NOx lter and an optional dust catch lter (P-250/350SF-E, P-250/350MF-E, P-250/350PF-E) are used together, make
sure to install a NOx lter on the SA side and a dust catch lter on the OA side.
* Install any of the lters other than NOx lter on the OA and RA side to protect the product.
OA
SA
RA
RA
SA
OA
4

Eng-7
5.HowtoUse
■Namesandfunctionsofcontrollercomponents
Controller interface
1 ON/OFF button
Off operation is disabled at the factory default
setting.
2 SELECT button
3 RETURN button
4 MENU button
The «Main menu» screen is displayed.
Main
Main display:
Cursor
Main menu
User options
Commissioning
Maintenance
Function buttons
5
6
1234
7
5 Backlit LCD
The screen displays operation settings.
Press any button to turn on the backlight.
You will be able to operate buttons.
After turning on the backlight for a certain period of time, the backlight turns o󰀨.
6 ON/OFF lamp
This lamp lights up in green while the product is operated.
It blinks in green, while the product has an error.
7 Function buttons (F1, F2, F3, F4)
Use to select each settings on each screen.
The functions of the buttons change depending on the screen.
See the function button guide at the bottom of the screen.
The function button guide
If any function is not in the function button, the function button guide is not displayed.
Main
Main display:
Cursor
Main menu
User options
Commissioning
Maintenance
F1 F2 F3 F4

Eng-8
Lossnay 12:00 Sun
Outdoor
0°C
Return
20°C
Supply
15°C
Fan Mode
AutoPurge
1
6
798
345 5
c
2
0 ab
Display
Fan speed setting appears here.
3 Fan speed
Appears when performing to protect the Heat
exchanger.
(adjusting air volumes or operating Preheater)
Current time and appear weekday here.
Appears when the Silent mode is enabled.
Lossnay is always displayed.
9
0
1 Controller name
The outdoor air temperature, return air (= extract)
temperature, and supply air temperature are
displayed. (The outdoor air temperature and the
return air temperature are measured by the product
built-in sensor.
- Since this product is not a measuring instrument,
there is a possibility that an difference may
occur with the local thermometer. The supply air
temperature shows the calculated values.) It is not
displayed in the factory default settings.
If you want to change the settings, please see
6.4.2.4 Display details of Installation Manual.
c Outdoor, Return, Supply temperature
Appears when the Boost/Purge preset, or the Manual
bypass mode function is enabled.
7
Appears when the filter maintenance time comes.
6
Appears when the Holiday mode is enabled.
8
Ventilation mode setting appears here.
4 Ventilation mode
* All icons are displayed for explanation.
2 Clock
5.HowtoUse(continued)
Functions of the corresponding buttons appear here.
5 Functionbuttonguide This is displayed while linking with the air conditioner.
a
This is displayed when the Fan speed is fixed by the
external input.
b

Eng-9
Power ON/OFF
Fan speed
Ventilation mode
Press the button.
The ON/OFF lamp will light up in green, and the operation
will start.
Press the button again.
The ON/OFF lamp will go out, and the operation will stop.
ON
OFF
F1 F2 F3 F4
Lossnay 12:00 Sun
Fan Mode
AutoNormal
Lossnay 12:00 Sun
Auto
Fan Mode
F1 F2 F3 F4
Normal
You can hide [Normal], [Medium], [Boost], [Purge] displayed
above the Fan speed icon by the controller.
To change the setting, please check 6.4.2.7 Control mode of
Installation Manual.
Press the F3 button to go through the Ventilation mode in
the following order.
■Basicoperations
Icon Function
It automatically switches between heat exchange mode and bypass mode by temperature
detection.
To switch the temperature, please see the Installation Manual 6.4.4 Auto bypass.
Heat exchange mode
Bypass mode.
Auto Auto
HeatEX
Bypass
5.HowtoUse(continued)
- OFF operation is disabled in the factory default settings. Therefore, if you turn on the power for the rst time, you cannot
turn it o󰀨 with this button.
- If you want to enable the OFF operation, see the Installation Manual section 6.4.2.7.
Normal Medium Boost Purge
You can hide [Auto], [HeatEX], [Bypass] displayed above
the Ventilation mode by the controller. See the Installation
Manual section 6.4.2.
Under factory default settings, bypass operation cannot
be selected from «Main display». Use the Manual Bypass
mode if you want to bypass operation at any timing. See the
Installation Manual section 6.4.2.7.
Note
Base notch: The [Base notch] is the fan speed of standard for constant ventilation.
The base notch is set to fan speed 1 at the factory default settings.
During [Boost] and [Purge], is shown. After a certain period of time, the fan speed will return to the [Base notch].
To change the [Base notch] setting, please see Installation Manual section 6.5.1.
Press the F2 button to change the fan speed in the following
order.
Auto Auto HeatEX Bypass

Eng-10
Clock
1
F1 F2 F3 F4
User options
Boost/Purge preset
Silent mode
Manual bypass mode
Holiday mode
Clock
Main menu:
Cursor
Select [User options] from the «Main menu» screen, and
press the button.
Select [Clock] and press the button.
2Increase or decrease the value, and press the button.
A confirmation screen will appear.
Note
Clock setting is required before making the following settings.
• Boost/Purge preset
• Silent mode
• Manual bypass mode
• Holiday mode
F1 F2 F3 F4
Clock
Select:
Cursor
2020 / 01 / 01 00: 00
yyyy / mm/ dd hh: mm
Button operation
Navigatingthroughthescreens
• To go back to the «Main menu» screen ......
• To return to the previous screen .................
■Controlleroperation-Functionsettings
5.HowtoUse(continued)
Menu composition
Function name Function Setting method and operation description Detailed setting method
1
Boost/Purge
preset
Turns o󰀨 the Boost/
Purge timer.
«Main display»
Select the ventilation air volume or .
Instruction Manual: Section 5
Boost/Purge preset.
Operation description: Returns to the base notch after a
certain time of operation.
2
Silent mode Prevents the noise at
night.
«Main menu», «User options»
Set weekdays and On/O󰀨 times.
Instruction Manual: Section 5
Silent mode.
Installation Manual: Section
6.4.5.
Operation description: Does not receive any external input
during the specied period.
3
Manual bypass
mode
Changes the bypass
ventilation timer.
«Main display»
In the ventilation mode, select the bypass mode.
Instruction Manual: Section 5
Manual bypass mode.
Installation Manual: Section
6.4.2.7.
Operation description: Returns to the heat exchange mode
after a certain time.
4
Holiday mode Saves energy in the
long absence.
«Main menu», «User options»
Select the Holiday mode.
Instruction Manual: Section 5
Holiday mode.
Operation description: Operates with small air volumes
5
Filter Maintenance
indicator
Shows a lter cleaning
sign every half year
(factory default
settings).
«Main menu», «Maintenance»
Reset the notication timing after cleaning the lters.
Instruction Manual: Section 5
Filter information.
Installation Manual: Section
6.4.11.
Main functions
F1 F2 F3 F4F1 F2 F3 F4 F1 F2 F3 F4
Cursor
User options
Boost/Purge preset
Silent mode
Manual bypass mode
Holiday mode
Clock
Main menu:
Cursor
Lossnay 12:00 Sun
Fan Mode
Auto
Main
Main display:
Main menu
User options
Commissioning
Maintenance
«Main display» «User options»«Main menu»

Eng-11
Boost/Purge preset
1
F1 F2 F3 F4
User options
Boost/Purge preset
Silent mode
Manual bypass mode
Holiday mode
Clock
Main menu:
Cursor
Select Boost/Purge preset from «User options» screen, and
press the button.
2[Timer]: Select [Yes] or [No].
[No]: You can set no time limit.
[Yes]: You can use [Stop in] operation.
[Stop in]: Time can be selected from 10, 20, 30, ... 170, 180
min.
The factory default setting: 30 min
F1 F2 F3 F4
Boost/Purge preset
Timer No/Yes
Stop in 30 min
Cursor Time
Select:
Button operation
5.HowtoUse(continued)
F1 F2 F3 F4
Lossnay 12:00 Sun
Fan Mode
AutoBoost
The Boost/Purge preset is the function that automatically sets
the time to return to the [Base notch].
When (Boost) or (Purge) is selected on the «main
display» screen, the fan speed will return to the [Base Notch]
automatically after a certain period of time.
During the Boost/Purge preset, appear icon in «Main
display» screen.
The Base notch is set to fan speed 1 at the factory
default setting.

Eng-12
Silent mode
1
F1 F2 F3 F4
User options
Boost/Purge preset
Silent mode
Manual bypass mode
Holiday mode
Clock
Main menu:
Cursor
Select [Silent mode] from «User options» screen, and press
the button.
2[Mode set]: Select [Yes] or [No].
The factory default setting: No
[Yes]: You can set day.
[On/Off]: You can set the time during day.
F1 F2 F3 F4
Silent mode
Mode set No/Yes
Mon Tue Wed Thu Fri Sat Sun
On/Off 22:00 / 6:00
Cursor Time
Select:
Button operation
5.HowtoUse(continued)
F1 F2 F3 F4
Lossnay 12:00 Sun
Fan Mode
AutoNormal
The Silent mode is an effective mode for noise prevention at
night.
During the Silent mode, icon will appear on the «Main
display» screen.
Note
Under the Silent mode, the signal from the external input and
operates are not received.

Eng-13
Manual bypass mode
1
F1 F2 F3 F4
User options
Boost/Purge preset
Silent mode
Manual bypass mode
Holiday mode
Clock
Main menu:
Cursor
Setting method of the Manual bypass mode.
Select [Manual bypass mode] from the «User options»
screen.
2You can set the operation time of the Manual bypass mode.
[Stop in]: Time can be selected from 1, 2, ... 11, 12 hour.
[Fan]: You can select Fan speed of the Manual bypass
mode.
The factory default settings: 4 hour and Fan speed is [Base
notch].
F1 F2 F3 F4
Manual bypass mode
Stop in 4 hour
Fan
Cursor Cursor
Select:
Button operation
5.HowtoUse(continued)
F1 F2 F3 F4
Lossnay 12:00 Sun
Fan
Baypass Normal
At the factory default settings, the Bypass mode cannot be
selected on the «Main display». Use the Manual bypass
mode at any timing to operate the Bypass mode.
During the Manual bypass mode, icon is displayed on
the «Main display».
The Manual bypass mode ends after the specified time.
Note
If outdoor temperature is below 8°C, the ventilation mode will not
change to the Bypass.

Eng-14
Holiday mode
1
F1 F2 F3 F4
User options
Boost/Purge preset
Silent mode
Manual bypass mode
Holiday mode
Clock
Main menu:
Cursor
Select [Holiday mode] from «User options» screen, and
press the button.
2[Mode set]: Select [Yes] / [No].
The factory default setting: No
[Yes]: You can set day when you are not in house.
[No. days away]: Day can be selected from 1, 2, … 89, 90
day(s)
F1 F2 F3 F4
Holiday mode
Mode set No/Yes
No. days away 7 day(s)
Cursor Day(s)
Select:
Button operation
5.HowtoUse(continued)
F1 F2 F3 F4
Lossnay 12:00 Sun
Fan Mode
AutoNormal
The Holiday mode is used when you are away from home for
a long time.
icon will appear on the «Main display».
The product starts the operation at the fan speed of the base
notch.
and will operate at 50% of the airflow.
Holiday mode
ON
× 50%
× 50%
× 100%
× 100%
F1 F2 F3 F4
Holiday mode
Mode set No/Yes
No. days away 7 day(s)
Cursor Day(s)
Select:
After pressing the button the Holiday mode starts.

Eng-15
Filter information
F1 F2 F3 F4
Lossnay 12:00 Sun
Fan Mode
AutoNormal
When this sign appears, clean or replace the filters.
See section 6about the cleaning the filters.
F1 F2 F3 F4
Main
Main display:
Cursor
Main menu
User options
Commissioning
Maintenance
Select [Maintenance] from «Main menu» screen, and press
the button.
F1 F2 F3 F4
Main menu:
Maintenance
Reset
Filter
Please clean the parts above.
Then press reset button.
Press the F4 button to reset cleaning sign.
See section 6to clean the filters.
When using optional filters, clean or replace them following
the their instructions.
Press the F4 button to select [OK].
A confirmation screen will appear.
F1 F2 F3 F4
Maintenance
Maintenance
OK
Cancel
Reset cleaning sign?
Filter
Cleaning sign reset
Main menu:
F1 F2 F3 F4
Maintenance
Maintenance
OK
Cancel
Reset cleaning sign?
Filter
Cleaning sign reset
Main menu:
2
3
4
1
Button operation
5.HowtoUse(continued)
Note
The sign is displayed after the specified fan operation time.

Eng-16
Whenanerroroccurs,thefollowingscreenwillappear.
Checktheerrorstatus,stoptheproduct,andconsultyourdealer.
F1 F2 F3 F4
F1 F2 F3 F4
Error information
Error code 5101
Error unit LC(Lossnay)
M-NET address 0
Model name VL-350CZPVU-E
Serial No. 01234567
ResetPage
Error information
Contact information
Dealer
Tel [phone]
ResetPage
Reset error:Reset button
Reset error: Reset button
1/2
2/2
Error code, error unit, unit model name, and serial number
will appear.
The model name and serial number will appear only if the
information have been registered.
Press the F1 or F2 button to go to the next screen.
Contact information (dealer's phone number) will appear if
the information have been registered.
Press the F4 button to reset the error information.
blinks
Error information
5.HowtoUse(continued)
blinks

Eng-17
Removedustanddirtonairltersatregular
intervalsinordertopreventadeteriorationin
the functions.
Cleanitatleastonceevery6months.
will appear on the «Main display» when the filter
needs to be cleaned. Factory default setting is 6
months.
WARNING
Makesuretoturno󰀨theisolatorbeforecleaning
and maintenance.
Failure to heed this warning may result in electric shock
or injury.
CAUTION
Wearglovesduringcleaningandmaintenance.
Failure to wear gloves may result in injury.
Duringcleaningandmaintenance,donotclimbon
an unstable stand.
Injury may result if you tumble down.
1) Turn o󰀨 the isolator on the power board before
removing lters.
2) Remove the lter cover (outdoor air lter and
exhaust air lter).
F1 F2 F3 F4
Lossnay 12:00 Sun
Fan Mode
AutoNormal
OFF
Isolator
Filter cover
(outdoor air lter)
Filter cover
(exhaust air lter)
6.Maintenance * The gure shows R-type.
3) Gently draw out the outdoor air lter case and the
exhaust air lter case.
CAUTION
Whenremovingtheoutdoorairltercaseand
exhaustltercase,dewcondensationwaterthat
hasbuiltupindoorsometimesdrips.So,remove
theltercasesgentlybysupportingthemwithboth
hands so that they are not tilted.
4) Remove the air lters from the outdoor air lter case
and the exhaust air lter case.
5) Remove the dust with a vacuum cleaner.
When the lter is heavily soiled, press and wash the
lter with cold or warm water (40 °C or less), and then
air-dry the lter.
Filter case
(outdoor air lter)
Filter case
(exhaust air lter)
Filter case
(outdoor air lter)
Outdoor air lter
Vacuum cleaner
Outdoor air lter
Care of filters

Eng-18
Note
- Donotwashthelterasbelow,otherwiseitcan
be distorted.
- Do not wash the lter with hot water.
- Do not wash the lter by rubbing or scrubbing.
- Do not squeeze or twist the lter.
- Whenalterisdamagedorithasbeenwashed
withwateraboutfourtimes,replacewiththe
Replacement Filter (sold separately).
- Afterreplacingthelters,disposeoftheused
outdoorairltersandexhaustairltersforin
accordancewithdisposalmethodsdesignatedin
theregionwhereyoulive.
Outdoor air lters and exhaust air lters are made of
PET and acrylic bers.
Howtoreplacelters(soldseparately)
Remove the outdoor air lters or exhaust air lters, and
install new lters (sold separately).
Note
- Makesuretoinstallltersintheltercasebefore
installingtheltercaseontheproduct.
- Donotmixupoutdoorairltersandexhaustair
lters.
Assemblingandcheckingaftercleaning
and maintenance
CAUTION
Securelyinstallpartsaftercleaningand
maintenance.
Injury could result if parts fall.
The lters’ catch e󰀩ciency drops.
1. Install the lter on the lter case by following the
disassembly procedure in reverse.
- Make sure that the lter is not protruded from the
lter case.
6.Maintenance (continued)
Care of the controller
To remove dirt from the controller’s display, wipe
with a cloth to which detergent has bee applied: and
then wipe with a dry cloth to remove any remaining
detergent.
Do not use the following solvents.(They will change the
quality and color.)
Paint thinner, alcohol, benzene, gasoline, kerosene,
spray cleaner, cleaning alkali, etc.
2. Install the outdoor air lter case and then install the
lter cover.
3. Install the exhaust air lter case and then install the
lter cover.
4. When you have nished assembling all, turn on the
isolater and check followings,
- Check for emission of abnormal noise.
- Check for normal air ow.
- Check for air leakage from the installation section of
the outdoor air lter case or exhaust air lter case.
5. Reset the lter cleaning sign.
- For details on how to reset the lter cleaning sign,
see section 5. Filter information.
Note
-Insomeoperatingenvironments,dew
condensationwaterorsnow/mistwaterdroplets
mayadheretothelters.This,however,isnota
problem in product performance or quality.
-Donotforgettoinstalltheltersinsidethe
product.(Doingsoresultsindirtcloggingthe
surfaceoftheheatexchangeroradropinair
volume.)
-Useanoptionaldustcatchlter(Standardlter,
Mediumlter,PM2.5lter(soldseparately))tosuit
yourspecicapplicationifyouareworriedabout
smallinsectsgettinginsideorsmalldirtordust
particles.

Eng-19
7.Troubleshooting
Takethefollowingactionsiftroubleshowninthetablebelowoccurs.
Iftroubleisnotcorrectedevenaftertakingtherequiredaction,oriftroubleotherthanthatindicatedinthe
followingtableoccurs,turnOFFtheisolator,andthencontactyourdealeroranelectricalcontractor.
Symptom Cause Action
No operation Power is not supplied to the product. Check the circuit breaker on the power board.
The button on the controller is not [ON]. Press the button on the controller to turn on.
There is a sound from the
product
The sound of fans moving and the sound of winds
owing.
It is not a malfunction.
Operating noise has
increased
The lter is not installed securely. Re-install the lter. (see section 6.)
The lter is clogged. Clean the lter. (see section 6.)
The outdoor hood is blocked. Remove obstacles.
Air ow has reduced The lter is clogged. Clean the lter. (see section 6.)
Burbling noise from the
product
Dew condensation water in the drain pipes is sucked
into the wind taken in by the product but is not being
discharged.
Reduce the fan speed of the product.
The noise will disappear as it becomes easier to
discharge the dew condensation water in the drain
pipes.
Noise uctuates Noise sometimes gets louder because of the
inuence of outdoor wind. This is not a malfunction.
If you are worried about sound uctuation, contact your
dealer or an electrical contractor.
Dew condensation water in
the lter case
Dew condensation water sometimes builds up in
some operating environments.
It is not a malfunction.
The volume of the operating
noise is di󰀨erent in di󰀨erent
rooms
The volume of the noise sometimes di󰀨ers, for
example, because of the length of the piping to each
room.
It is not a malfunction.
During winter season,
Sometimes supply air stops.
The product is operating in the supply air intermittent
mode.
It is not a malfunction.
See Automatic supply air stop function/Automatic
supply air intermittent operation function. (see next
page.)
Supply air ow is cold The outdoor air temperature is low. It is not a malfunction.
Supply air sometimes is cooled be the outdoor air.
Small insects intrude into the
indoor through the supply air
vent.
Small insects could intrude into the indoor from the
outdoor through the product.
It is not a malfunction.
The volume of intruding insects can be reduced by
using the high performance lter (optional parts).
Condensation occurs on the
outside of the product.
If the outdoor temperature is low or the indoor
humidity is high, condensation can occur outside the
product.
It is not a malfunction.
Remove the condensation with a cloth.
Inside the product or the lters
are wet.
Inside the product or the lters can become wet due
to fog outdoor or condensation.
It is not a malfunction.
Condensation occurs on the
outlet of the supply air vent.
If the outdoor or indoor humidity is high, condensation
can occur.
It is not a malfunction.
Remove the condensation with a cloth.
The air volume increases/
decreases without any
command.
The air volume can increase/decrease automatically
if the product receives external output.
It is not a malfunction.
Check the setting.
Whenthecontrollerisnotworking:
Symptom Cause Action
The OFF button does not
function to stop the product.
The Enable OFF button is set to invalid. (At factory
default settings, the Enable OFF button is set to No.)
It is not a malfunction.
If the Enable OFF button is set, turn the isolator OFF to
stop the product.
To cancel the Enable OFF button setting, see 6.4.2.7
Control mode in the Installation Manual.
Ventilation mode (bypass,
auto bypass) cannot be
selected.
Due to the skip setting.
(At factory default setting, the bypass ventilation is
set to Skipped.)
It is not a malfunction.
To cancel the skip setting, see 6.4.2.7 Control mode in
the Installation Manual.
The fan speed ( , , ,
or ) cannot be selected.
Due to the skip setting.
(At factory default setting, is Skipped.)
It is not a malfunction.
To cancel the skip setting, see 6.4.2.7 Control mode in
the Installation Manual.
The air volume is changed
without any command.
To protect the Heat exchanger from frost in winter,
the air volume can increase/decrease.
It is not a malfunction.
The air volume can increase/decrease automatically
if the product receives external output.
The air volume is not changed
even when the product fan
speed is changed.
When receiving the external input, the priority is
given to it even when the lower fan speed is selected.
(External input icon is displayed if the fan speed is
determined by the external input.)
It is not a malfunction.

Eng-20
7.Troubleshooting(continued)
Automaticsupplyairstopfunction/Automaticsupplyairintermittentoperation
function
ToprotecttheHeatexchangerfromfrost,theproductrunstheAutomaticsupplyairstopoperation/
Automaticsupplyairintermittentoperationwhentheoutdoorairtemperatureis-3 °Corlower.
TopreventfrostfromadheringtoHeatexchanger,thesupplyairfaniscontrolledaccordingtothe
temperaturesbelow.
Outdoor temperature -15 °C or lower Between -15°C and -3°C -3°C or higher
Mode Supply air stop mode Supply air intermittent operation Continuous operation
Note
-Preheater(eldsupply)isrecommendedtomaintaincertainsupplyairandexhaustair.
-Whentheoutdoorairtemperatureis-15°Corlower,thesupplyairfanruntodetecttheoutdoorair
temperature.
-Whentheoutdoorairtemperatureis-25°Corlower,thesupplyairfandoesnotrunforthedetectionofthe
outdoor air temperature.