Mitsubishi Electric Lossnay VL-CZPVU-R/L-E User manual

les.mitsubishielectric.co.uk
Homeowner quick start guide
& commissioning record
Follow these easy steps to make the most
of what your Lossnay has to offer

Introduction to your new
Lossnay ventilation system
(Mechanical Ventilation with Heat Recovery)
2
This booklet has been created to enable you to understand the ventilation
system controls to provide a good quality indoor environment for your home.
If you require more in depth information, please refer to the instruction booklets
using the links on page 15.
The Lossnay unit contains low powered fans that extracts air from bathrooms, kitchens, toilets
and utility rooms. It simultaneously supplies a balanced air flow to living spaces such as living
rooms and bedrooms.
The unit includes a heat exchanger that will warm the incoming fresh air with the energy of the
air being extracted. The air paths do not mix with each other and only temperature is exchanged.
Filters keep particles, like dust and pollen from entering inside.
Fresh air supply
into the room
(SA - Supply Air)
Stale air removed
from the room
(RA - Return Air)
Fresh air
from outside
(OA - Outside Air)
Stale indoor
air exhausted
to outside
(EA - Exhaust Air)
Heat exchanger
Main controller
Bypass damper
Lossnay VL-CZPVU-R/L-E

3
Bypass
The Lossnay unit contains a bypass damper that can change the air path of the extracted air so that it
bypasses the heat exchanger. In doing so, the supplied fresh air will be the same temperature as the air
outside. This can be advantageous during the summer period where you may wish to bring in the colder
air from outside to help cool down in the evening.
Putting the unit in auto mode will allow the unit to sense when it is advantageous to do this under the
commissioned settings. The commissioner will set the desired indoor temperature during the summer,
the minimum outdoor temperature to avoid extreme conditions, and a temperature difference between
the two. Details of the commissioned settings should be found in the commissioning log at the back of
this document.
Note: this function requires the right indoor/outdoor conditions. It is not the same as active
cooling/air conditioning and a cooling effect cannot be guaranteed.
Boost switches
Often, a continuous normal/trickle air flow will maintain the fresh air within your home, and a boost
mode will be set up for an event such as showering or cooking when extraction is the most important.
Your unit may be set up to boost automatically, or require you to press a switch nearby. A delay for the
boost can be set by the commissioner to stop nuisance tripping, as well as an overrun feature to maintain
the boost levels beyond the switch being turned off. Details can be found in the commissioning log at
the back of this document. Avoid leaving the unit in boost to minimise energy usage.
Air valves/terminals
The air is supplied and extracted from terminals or air valves that may look
like this image. They will have been set up and commissioned by a professional
engineer to the air flows required in accordance to the building design and
building regulations. Do not attempt to turn or adjust the air valves
yourself as you will upset the balance of the system.
How to operate the system effectively
The system is set up to require minimal user intervention.
The system is designed to continuously run 24/7.
Modern building techniques used create homes that are very air tight, meaning air cannot naturally
move through the dwelling. This is excellent for energy efficiency and reducing carbon emissions.
The Lossnay is a mechanical ventilation system that guarantees your house can breathe appropriately.
Turning off the system can have negative effects on both the dwelling and occupant’s health.
A boost air flow rate may be required during a pollutant generating event such as showering or cooking .
The unit can be installed a multitude of ways to receive a boost command. The most common of these
will be through a light switch type fitting in the extract rooms. It can also be automatic from turning on
the bathroom light or cooker hood, or using humidity sensors.
The installed method should be marked out in the commissioning log book.

No. Name Function
1
2
3
4
5
6
7
ON/OFF button
SELECT button
RETURN button
MENU button
Backlit LCD
ON/OFF lamp
Function buttons
(F1, F2, F3, F4)
-
-
-
The main menu screen is displayed.
Press any button to turn on the backlight.
You will then be able to operate buttons.
The backlight will turn off automatically after a period of time.
This lamp lights up in green while the product is operated.
It blinks in green when the product has an error.
Use to select each settings on each screen.
The functions of the buttons change depending on the screen.
To change the settings of your ventilation system please use the main controller
located on the front panel.
The following is a quick guide to viewing the main settings.
Should you require more information please refer to the instruction booklet.
Main Remote Controller
4
Purge
F1 F2 F3 F4
3
4
2
5
7
6
1

5
This display screen highlights all the functions available on your controller.
Please see below an explanation of each icon.
Main Screen Icons
No. Name Function
1
2
3
4
5
6
7
8
9
10
11
12
13
Controller Name
Clock
Fan speed
Ventilation mode
Function button guide
Filter Sign
Outdoor, Return,
Supply temperature
Lossnay is always displayed.
Current time and day appear here.
Current fan speed setting appears here.
Current ventilation mode setting appears here.
Functions of the corresponding buttons appear here.
Appears when the filter requires maintenance.
Appears when the “Boost/Purge preset”, or
“Manual bypass mode” timer is active.
Appears when the “holiday mode” is enabled.
Appears when performing anti-frost to protect the Heat Exchanger,
by adjusting air volumes or operating a pre-heater.
Appears when the “Silent mode” is active.
This is displayed while linking with an air conditioner.
This is displayed when the Fan speed is fixed by an external input.
The outside air temperature, return air (extract) temperature,
and supply air temperature are displayed.
Purge
7
5
8 10 1112
54
2
13
1
6
9
3

6
Normal Medium Boost Purge
Auto
F1 F2 F3 F4
Some speeds will be hidden if uncommissioned.
In some instances, only 1 speed will be available.
Bypass mode may only be available through the user
options>Manual Bypass mode menu.
It is advised to leave the unit in Auto mode.
Auto
F1 F2 F3 F4
Heat EX BypassAuto Auto
Icon Function
It automatically switches between heat exchange mode
and bypass mode by temperature detection.
Heat exchange mode.
Bypass mode.
Press the button to change the fan speed
in the following order:
Fan Speed Operation
F2
Press the button to go through the
ventilation modes in the following order:
Ventilation Mode
F3
Heat EX
Bypass
Auto Auto

7
Step 1
Step 2
Clock setting is required before making the
following settings.
- Boost/Purge present
- Silent mode
- Manual bypass mode
- Holiday mode
Select «User options» from the «Main menu» screen.
and press the button.
Select “Clock” and press the button.
Clock Setting
Increase or decrease the value, and
press the button.
A confirmation screen will appear.
Navigating through the screens.
- To go back to the «Main menu» screen press
- To return to the previous screen press
F1 F2 F3 F4
Clock
Select:
Cursor
2021 / 01 / 01
yyyy / mm/ dd
00: 00
hh: mm
F1 F2 F3 F4
User options
Boost/Purge preset
Silent mode
Manual bypass mode
Holiday mode
Clock
Main menu:
Cursor

8
Silent Mode
Step 1
Silent mode is an effective mode for noise prevention
at night. During Silent mode, icon will appear on the
«Main Display» screen.
Under Silent mode, the signal from the external input
and are not received.
Select “Silent mode” from «User options» screen,
and press the button.
Step 2
Mode set: Select “No” or “Yes”.
Factory default setting is “No”.
Mode set: “Yes”, You can set day.
Mode set: “On/Off”, You can set the time during day.
Auto
F1 F2 F3 F4
F1 F2 F3 F4
User options
Boost/Purge preset
Silent mode
Manual bypass mode
Holiday mode
Clock
Main menu:
Cursor
F1 F2 F3 F4
Silent mode
Mode set No/Yes
Mon Tue Wed Thu Fri Sat Sun
On/Off 22:00 / 6:00
Cursor
Select:
Time

9
Holiday Mode
Holiday mode is used when you are
away from home. When in holiday
mode, the unit will operate at 50%
of the lowest commissioned speed.
Select Holiday mode from
«User options» screen,
and press the button.
Mode set: Select “Yes” / “No”.
You can set amount of days that you
will not be in the house, 1-90 day(s).
After pressing
Holiday mode starts.
F1 F2 F3 F4
User options
Boost/Purge preset
Silent mode
Manual bypass mode
Holiday mode
Clock
Main menu:
Cursor
Auto
F1 F2 F3 F4
F1 F2 F3 F4
Holiday mode
Mode set No/Yes
No. days away 7 day(s)
Cursor
Select:
Day(s)
F1 F2 F3 F4
Holiday mode
Mode set No/Yes
No. days away 7 day(s)
Cursor
Select:
Day(s)
Step 1
Step 2

10
Filter Information
Step 1
When this sign appears, clean or replace
the filters.
Select Maintenance from «Main menu» screen,
and press the button.
Step 2
Press the button to reset cleaning sign.
Refer to ‘Care of Filers’ section for information
to clean the filters.
F1 F2 F3 F4
Main menuMain
User options
Commissioning
Maintenance
Main display:
Cursor
Auto
F1 F2 F3 F4
F1 F2 F3 F4
Maintenance
Filter
Please clean the parts above.
Then press reset button.
Main menu:
Reset
F4

A confirmation screen will appear.
By default, this button is disabled as it is a
continuous ventilation system.
If available, 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.
11
Step 3
Select “OK” with the button.
F1 F2 F3 F4
Maintenance
Filter
Reset cleaning sign?
OKCancel
F1 F2 F3 F4
Maintenance
Cleaning sign reset.
Main menu:
F4
On/Off Control
ON OFF

12
Error Information
When an error occurs, the following screen will
appear. Check the error status, stop the product,
and consult a ventilation installation engineer.
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 or button
to go to the next screen.
Contact information (dealer's phone number) will
appear if the information has been registered.
Press the button to reset the error information.
F1 F2 F3 F4
1/2Error information
Error code
Error unit
M-NET address
Model name
Serial No.
5101
LC(Lossnay)
0
VL-350CZPVU-E
01234567
Reset error: Reset button:
Page Reset
F1 F2 F3 F4
Error information
Contact information
Dealer
Tel [phone]
Reset error: Reset button:
Page Reset
2/2
Blinks
F1
F4
F2

WARNING
Be sure to turn off the circuit breaker on the power board 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.
13
Care of Filters
Remove dust and dirt on air filters 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» screen
when the filter needs to be cleaned.
Default setting is 6 months.
Auto
F1 F2 F3 F4
Turn off the isolater on the power
board before removing filters.
Step 1
Remove the filter covers
(outside air filter and exhaust air filter).
Step 1
Filter cover
(Outside air filter)
Filter cover
(Exhaust air filter)
Filter orientation may change
depending on unit orientation.
Special filters such as PM2.5 and
NOx filters cannot be cleaned.
Details of fitted filters and replacement intervals can
be found in the commissioning log at the back of
this document.

14
Gently draw out the filter cases
(outside air filter and exhaust air filter).
Step 3
When the filter is heavily soiled, press and wash the filter with cold
or warm water (40°C or less), and then air-dry the filter.
Do not wash the filter as shown opposite, otherwise it can be distorted.
Do not wash the filter with hot water.
Do not wash the filter by rubbing or scrubbing.
Do not squeeze or twist the filter.
Remove the air filters from the outside air
filter case and the exhaust air filter case.
Step 4
Remove the dust with
a vacuum cleaner.
Step 5
Filter case
(Outside air filter)
Filter case
(Exhaust air filter)
Care of Filters
CAUTION
When removing the outside air filter case and exhaust filter case, dew condensation
water that has built up inside sometimes drips. So, remove the filter cases gently
by supporting them with both hands so that they are not tilted.
Filter orientation may change
depending on unit orientation.
Ensure that filter types do not change
location as this can change and
unbalance the air flow.

15
Further Information
Further information is available on the Mitsubishi Electric Document Library.
Please use the web addresses or scan the QR codes below.
les.mitsubishielectric.co.uk/homeowners/register-lossnay-guarantee
1. Register the homeowner guarantee
library.mitsubishielectric.co.uk/pdf/book/VL-250-350CZPVU-E_
Instruction_Manual__876H46401#page-1
2. Instruction Manual

16
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 a ventilation
installation engineer or an electrical engineer.
Symptom ActionCause
No Operation
Operating noise
has increased
Air flow has reduced
Burbling noise
from product
Power is not supplied
to the product.
The ON/OFF button on the
controller is not “ON”.
The filter is not installed securely.
The filter is clogged.
The outdoor hood is blocked.
The filter is clogged.
Dew condensation water in the
drain pipes is sucked into the
wind taken in by the product
but is not being discharged.
Noise sometimes gets louder
because of the influence of
outside wind. This is not a
malfunction.
Dew condensation water
sometimes builds up in some
operating environments.
The volume of the noise
sometimes differs, for example,
because of the length of the
piping to each room.
The unit is operating in the
supply air intermittent mode
to prevent the heat exchanger
becoming frozen.
Check the circuit breaker on
the power board.
Press the ON/OFF button on the
controller to turn on.
Re-install the filter.
Clean the filter.
Remove obstacles.
Clean the filter.
Reduce the fan speed of the ventilation
unit. The noise will disappear as it
becomes easier to discharge the dew
condensation water in the drain pipes.
If you are worried about sound
fluctuation, contact your ventilation
or an electrical engineer.
It is not a malfunction.
It is not a malfunction.
It is not a malfunction. See
“Automatic supply air stop
function/Automatic supply air
intermittent operation function.”
Noise fluctuates
Dew condensation
water in the
filter case
The volume of the
operating noise
is different in
different rooms
During winter
season, Sometimes
supply air stops.

17
Symptom ActionCause
Inside the product
or the filters
are wet.
The air volume
increases/ decreases
without any
command.
Inside the product or the filters
can become wet due to fog
outside or condensation.
The air volume can increase/
decrease automatically if the
product receives external output.
It is not a malfunction.
It is not a malfunction.
Check the setting.
Symptom ActionCause
The air volume is
changed without
any command.
The air volume
is not changed
even when the
product fan speed
is changed.
To protect the Heat exchanger
from frost in winter, the air
volume can increase/decrease.
The air volume can increase
decrease automatically if the
product receives external output.
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.
It is not a malfunction.
Controller

18
Customer Information
Name:
Telephone:
Email:
Address:
Building Information
Continuous ventilation / extract low rate (Part F 2010, table 5.1b) (l/s)
Boost extract minimum high rate (Part F 2010, table 5.1a) (l/s)
Building Regulations Notification No.
Installer Information
Name:
Company:
Telephone:
Email:
ME Installer No.
Address:
Commissioning Checklist
This commissioning checklist is to be completed in full by the installer who commissioned
the Lossnay and associated equipment as a means of demonstrating compliance with the
appropriate regulations and then handed to the customer to keep for future reference.
For further information to install, please refer to Mitsubishi Electric training literature and
installation manual.
Failure to install and commission this equipment to the manufactures instructions may
invalidate the warranty but does not effect statutory rights.

19
Speed Information
Normal:
Medium:
Boost:
Purge:
Filter Maintenance Information (Please tick the appropriate box)
Outside air: Standard G3 (default)
Supply air:
Supply % Extract %
Supply % Extract %
Supply % Extract %
Automatic Bypass Information
Desired indoor temperature (ºC):
Minimal external temperature (ºC):
Temperature difference (ºC):
Supply % Extract %
Boost Control(s) Information (Please tick the appropriate box)
Dedicated switches Other, please state:
Interlocked light switches
Automatic sensors
Delay timer (min): Overrun timer (min):
Return air:
Outside air filter intervals:
Supply air filter interval:
Return air filter intervals:
Standard G3 (default)
PM2.5
PM2.5 NOx
Clean every months / Replace every months
Clean every months / Replace every months
Replace every months
Note: Default intervals for standard filters is to clean every 6 months and replacement after 12 months. Default intervals
for PM2.5 and NOx filters is replacement every 6 months, unless the PM2.5 filter is fitted in the supply air alongside a
standard filter for the outside air in which case the default interval is to replace every 12 months.

Designed by Square Bear Limited 01604 899099
015
015
UNITED KINGDOM Mitsubishi Electric Europe Living Environmental Systems Division,
Travellers Lane, Hatfield, Hertfordshire, AL10 8XB, England. Telephone: [phone] Fax: [phone]
IRELAND Mitsubishi Electric Europe, Westgate Business Park, Ballymount, Dublin 24, Ireland.
Telephone: [phone] Fax: [phone] International code: (003531)
Country of origin: United Kingdom - Japan - Thailand - Malaysia. ©Mitsubishi Electric Europe 2021. Mitsubishi and Mitsubishi Electric are trademarks of Mitsubishi Electric Europe
B.V. The company reserves the right to make any variation in technical specification to the equipment described, or to withdraw or replace products without prior notification or public
announcement. Mitsubishi Electric is constantly developing and improving its products. All descriptions, illustrations, drawings and specifications in this publication present only
general particulars and shall not form part of any contract. All goods are supplied subject to the Company’s General Conditions of Sale, a copy of which is available on request.
Third-party product and brand names may be trademarks or registered trademarks of their respective owners.
Note: The fuse rating is for guidance only. Please refer to the relevant databook for detailed specification. It is the responsibility of a qualified electrician/electrical engineer to select
the correct cable size and fuse rating based on current regulation and site specific conditions. Mitsubishi Electric’s air conditioning equipment and heat pump systems contain a
fluorinated greenhouse gas, R410A (GWP:2088), R32 (GWP:675), R407C (GWP:1774), R134a (GWP:1430), R513A (GWP:631), R454B (GWP:466), R1234ze (GWP:7) or R1234yf
(GWP:4). *These GWP values are based on Regulation (EU) No 517/2014 from IPCC 4th edition. In case of Regulation (EU) No.626/2011 from IPCC 3rd edition, these are as follows.
R410A (GWP:1975), R32 (GWP:550), R407C (GWP:1650) or R134a (GWP:1300).
@meuk_les
@green_gateway
Mitsubishi Electric Living
Environmental Systems UK
Telephone: [phone]
email: air[email protected]
les.mitsubishielectric.co.uk
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Cooling and Heating UK
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Environmental Systems UK thehub.mitsubishielectric.co.ukmitsubishielectricuk_les