System air SAVE VTR 150/K User manual

Document translated from English | 211568 · A003, 29
SAVE VTR 150/K
GB User Manual................................................2
SV Användarhandbok .....................................26
DE Bedienungsanleitung .................................50
FI Käyttöohje................................................74

211471 | A003, 29
GB
User Manual GB
© Copyright Systemair UAB
All rights reserved
E&OE
Systemair UAB reserves the rights to alter their products without notice.
This also applies to products already ordered, as long as it does not affect the previously agreed specifications.

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Contents
1 Disposal and recycling ......................................5
2 Warnings.......................................................5
3 Type label......................................................6
4 Introduction ...................................................6
5 Cooker hood ..................................................6
6 Configuration .................................................7
6.1 General................................................7
6.2 Startup wizard .......................................7
6.3 Common symbols...................................7
6.4 Menu overview .....................................8
6.5 Home screen.........................................8
6.5.1 User modes ..............................8
6.5.2 Temperature settings ................ 11
6.5.3 Airflow settings ....................... 12
6.5.4 Indoor Air Quality ..................... 12
6.5.5 Status line .............................. 12
6.6 Description of User function icons ............ 13
6.7 Week Schedule..................................14
6.7.1 Schedule airflow
settings.................................. 14
6.7.2 Edit schedule .......................... 14
7 Cooker hood maintenance............................... 15
7.1 Cleaning cooker hood............................ 15
8 Maintenance of the unit.................................. 15
8.1 Warnings............................................ 15
8.2 Remove/mount the outer front ............... 16
8.3 Remove/mount the inner front................ 16
8.4 Changing filters.................................... 16
8.4.1 Resetting the filter time ............. 17
8.5 Checking and cleaning the heat
exchanger .......................................... 17
8.6 Cleaning the fans ................................. 17
8.7 Replacing rotor drive belt ....................... 17
8.8 Overheat protection reset button............. 19
9 Duct system maintenance ............................... 19
9.1 Cleaning extract louvres and supply air
diffusers............................................. 19
9.2 Checking the outdoor air intake ............... 19
9.3 Checking the roof cowl (if fitted).............. 19
9.4 Checking and cleaning the duct
system ..............................................19
10 Troubleshooting............................................ 19
11 Alarms........................................................21
11.1 Alarm list............................................ 21

GB Disposal and recycling | 5
1 Disposal and recycling
This product is compliant to the WEEE directive. When disposing the unit, follow your local rules
and regulations.
This product packing materials are recyclable and can be reused. Do not dispose in household
waste.
2 Warnings
Danger
• Make sure that the mains supply to the unit is disconnected before performing any maintenance or
electrical work!
• All electrical connections and maintenance work must be carried out by an authorized installer and in
accordance with local rules and regulations.
Warning
• This product must only be operated by a person who has suitable knowledge or training within this field
or carried out with the supervision of a suitably qualified person.
• Beware of sharp edges during mounting and maintenance. Use protective gloves.
Warning
• All though the mains supply to the unit has been disconnected there is still risk for injury due to rotating
parts that have not come to a complete standstill.
Important
• The installation of the unit and complete ventilation system must be performed by an authorized installer
and in accordance with local rules and regulations.
• The system should operate continuously, and only be stopped for maintenance/service.
• Do not connect tumble dryers to the ventilation system.
• Duct connections/duct ends must be covered during storage and installation.
• Make sure that filters are mounted before starting the unit.
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6| Type label GB
3 Type label
Before calling your service representative, make a note of the specification and production number from the type label,
which can be found on the side of the units, next to the external connections.
Fig. 1 Type label
Position Description
1Product code (product specification)
2Product item number
3Production order number
4Serial number
5Production date (YY.MM.DD)
6QR code for manufacturing order (MO) number and software version
7QR code for the spare parts list and documentation
4 Introduction
The SAVE VTR 150/K is a heat recovery ventilation unit with a built in rotating highly efficient heat exchanger and cook-
er hood. The SAVE VTR 150/K is suitable for smaller flats or houses. It supplies filtered outdoor air to residential areas
and extract air from bathroom, kitchen and wet rooms.
There are two model options, right (R) and left (L) model. Both models come with 500 W or 1000 W installed re-heater
battery. The different models are recognized by the placing of the internal components. This manual describes basic in-
formation how to operate and perform maintenance on a left (L) unit and the system it is connected to.
Note:
This document describes a left (L) model. The inside of a right (R) model is mirrored.
5 Cooker hood
Danger
• Do NOT flambé beneath the cooker hood when in use.
• Sufficient air flow must be secured to the room when the cooker hood is in use
Press button A to turn on the lights.
Press button B once to open the ventilation damper when cooking. The LED indicator (C) is steadily lit.
Press button B again to force the ventilation. The LED indicator is blinking.
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GB Configuration | 7
A B C
Fig. 1 Cooker hood front panel
Press button B a third time to close the ventilation damper. The ventilation
fan goes back to nominal speed and the LED indicator goes off.
The damper will automatically close after 60 minutes unless it is manually
closed.
No extract air will go through the cooker hood in "off" mode. Extract air from
the kitchen needs a separate air valve.
Hint: Let the damper be open a while before and after cooking to prevent
smoke from spreading in the room.
6 Configuration
6.1 General
SAVE VTR 150/K has a modern touchscreen LCD control panel, simply known as HMI — Human Machine Interface. The
touchscreen display provides information about current state of the unit and allows you to control all system functions.
Settings are done by touching the icons or options. The touch screen is sensitive and it is not necessary to press too
hard.
6.2 Startup wizard
During the first power up of the unit, you will be asked to set:
• menu language
• time and date
• import configuration file (if the Internet Access Module (IAM) with configuration file is available)
• airflow control type (Manual/RPM) and airflow level values
• heater type (None/Electrical/Water/Change-over)
The Startup Wizard cannot be skipped.
6.3 Common symbols
The following selection symbols are common and are present in most menu pages:
Back button to return to a previous
menu, located at the upper left corner
On and Off slider to activate or
deactivate a function. White bubble —
function is inactive, green bubble —
function is active.
Up arrow to increase a value CANCEL Button to cancel changes
Down arrow to decrease a value SET/OK Buttons to confirm changes
Some menus have more than one page. Touch page indicator in the top right corner to go to the next page. The first
number indicates current page number and the second number indicates a total number of pages available.
Many options show up in a form of the pop-up window. Select the option from the displayed list in the pop-up window
and press OK to confirm selection.
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8| Configuration GB
6.4 Menu overview
A.Return to home screen
B. Basic read-only information about the unit
C. Currently active alarms and alarm history
D. Configure and check week schedule
E. Check and change remaining time till filter change
F. General system preferences
G.Configuration of all system parameters
H.Help and troubleshooting menu
6.5 Home screen
Touching home icon (pos. A) in drop-down menu
list (pos. 1) will always returns you to home screen after
commissioning.
1. Drop-down menu list
2. Active user mode
3. Airflow settings
4. Temperature settings
5. List of active alarms
6. Icon list of active user functions
6.5.1 User modes
The first icon at the top of home screen shows currently active user mode. To change the user mode, touch the active
user mode icon (pos. 2) and select a new user mode from the list. The unit has 2 permanent and 5 temporary user
modes available for selection. Only one mode can be active at a time.
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GB Configuration | 9
Settings of all modes can be modified in Service menu.
6.5.1.1 Permanent modes
Permanent modes are always active unless interrupted by temporary modes, activated user functions or alarms:
Icon Text Description
AUTO
Automatic airflow control. AUTO mode is available for selection when Demand
Control,Week Schedule and/or external fan control functions are configured,
otherwise AUTO mode icon won’t be visible in active user modes menu. AUTO
mode activates Demand Control,Week Schedule and/or external fan control
functions. Demand is available to choose as airflow setting in Week Schedule.
MANUAL
Manual selection of airflow levels. The unit can be set run at one out of four
available airflow speeds: Off/Low/Normal/High.
Note:
The fan can be set to OFF by activating Manual Fan Stop function in
Service menu.
6.5.1.2 Temporary modes
Temporary modes are active only for a set period of time unless interrupted by active user modes, activated user func-
tions or alarms:
Icon Text Description
HOLIDAY
Sets speed of both supply and extract air fans to Low levels when user is away
from home for a long period of time.
ECO mode is active.
Set duration in days.
CROWDED
Sets speed of both supply and extract air fans to maximum High levels and
temperature setpoint offset to –3 K when apartment is more crowded than usual.
Default temperature setpoint offset is –3 K.
Set duration in hours.
AWAY
Sets speed of both supply and extract air fans to Low levels when user is away
from home for a short period of time.
ECO mode is active.
Set duration in hours.
REFRESH
Sets speed of both supply and extract air fans to maximum High levels to
replace indoor air with a fresh air in a short period of time.
Set duration in minutes.
FIREPLACE
Sets speed of supply air fan to High level and extract air fan to Low level to
increase air pressure within the apartment for better smoke extraction through
the chimney.
Set duration in minutes.
Settings of all modes can be modified in Service menu.
Temporary modes and user functions are active only for a set period of time after which they are terminated and the
unit changes back to a former AUTO or MANUAL mode, depending on which one was active before temporary mode or
user function was activated.
Temporary modes can also be activated via digital input signal triggered by push button, presence detector, etc.
6.5.1.3 Digital input functions
Digital input functions always active while digital input is activated.
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10 | Configuration GB
Icon Text Description
Central
Vacuum
Cleaner
Function sets speed of supply air fan to High level and extract air fan to Low
level to increase air pressure within the apartment for better dust collection
through central vacuum cleaner.
Function can be activated via digital input — Central Vacuum Cleaner
Function.
Cooker Hood
Sets speed of both supply and extract air fans to Maximum level to increase
airflow in the cooker hood.
Function can be activated via digital input — Cooker Hood Function.
Configurable
Digital Input
1
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
High–priority function.
Configurable
Digital Input
2
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
Mid–priority function.
Configurable
Digital Input
3
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
Low–priority function.
Pressure
Guard
Configurable digital input for pressure switch connection. Airflow levels for both
fans are freely configurable.
6.5.1.3.1Configurable digital inputs
A custom airflow settings for supply and extract fans can be set and assigned to a digital input. Each fan can have a dif-
ferent airflow setting.
Configurable digital input can be activated via signal triggered by push button, presence detector or any other external
device with digital output, such as Building Management Systems (BMS)
Configurable digital inputs are grouped in levels of priority, Configurable Digital Input 1 being the highest,
meaning it can’t be overwritten by other user functions.
6.5.1.4 Digital input and Mode hierarchy
User modes and functions have a different hierarchy. User functions activated via HMI or mobile APP, such as AWAY,
CROWDED,FIREPLACE,HOLIDAY and REFRESH, are interrupted by manual selection of AUTO and MANUAL fan modes.
AFIREPLACE function has the highest priority between user functions. Other functions activated via HMI/APP can in-
terrupt each other.
If FIREPLACE function is hard-wired on the connection board and configured as digital input (DI) then it has a higher
priority than AUTO and MANUAL mode. Digital input for a FIREPLACE function has also a higher priority than other
hard-wired digital inputs (DI) for: AWAY,CENTRAL VACUUM CLEANER,COOKER HOOD,CROWDED,HOLIDAY or REFRESH.
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GB Configuration | 11
Fig. 2 Hierarchy of user modes and digital inputs
Modes are listed from the highest to lowest priority; A — user modes that can be activated from the control panel; B —
user modes and functions activated via digital input
6.5.2 Temperature settings
Temperature can be set at SET TEMPERATURE menu accessible from the home screen by touching
TEMPERATURE icon with thermometer. Default temperature value is 18°C (range 12–30°C).
Use up and down arrows or a slider to change the value.
Then touch the OK button to confirm changes.
Temperature set point is for room air temperature, supply air temperature or for extract air temperature depending on
which control mode is active. Default setting is Supply air temperature control.
Control mode of the temperature can be changed in Service menu.
6.5.2.1 ECO mode
ECO mode is a power saving function that can be activated in SET TEMPERATURE menu.
ECO mode function is available only when an internal heater is installed and configured.
While ECO mode is active, a temperature setpoint at which heater is activated is lowered to avoid activation of the heat-
er during cold nighttime.
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12 | Configuration GB
If the temperature is very low and the heater is activated during the nighttime (even with lowered temperature set-
point), then during the upcoming daytime indoor temperature will be increased using the heat exchanger so that accu-
mulated heat could be used during the next cold nighttime, the lowered setpoint for the heater remains.
ECO mode will have impact for the following user
functions/modes if selected: ECO mode is always activated by the following modes:
•AUTO mode
•MANUAL mode
•AWAY mode
•HOLIDAY mode
•CENTRAL VACUUM CLEANER function
•COOKER HOOD function
•FIREPLACE mode
•AWAY mode
•HOLIDAY mode
ECO mode is always deactivated by the following user
functions/modes:
•CROWDED mode
•REFRESH mode
•FREE COOLING function
6.5.3 Airflow settings
Airflow settings are available only in MANUAL mode. Click on fan icon on the main screen to enter SET
AIRFLOW menu.
Use up and down arrows or a slider to change the airflow value.
The airflow may be adjusted in these steps: Off/Low/Normal/High. These settings control output signals to the sup-
ply and extract fans.
Important
It is not recommended to set fan to Off in standard households. If manual fan stop is activated, the unit
should be provided with dampers in exhaust and fresh air ducts to avoid cold draught and risk of
condensation when the unit has been stopped.
The fan can be set to Off by activating Manual Fan Stop function in Service menu.
6.5.4 Indoor Air Quality
The unit automatically controls indoor humidity and/or CO2levels by adjusting airflow setting. Airflow is
increased if air quality is decreasing.
Demand Control function is responsible for IAQ (Indoor Air Quality) regulation. Relative humidity (RH) and/or CO2sen-
sors are responsible for IAQ monitoring.
Indoor air quality (IAQ) indicator is available if AUTO mode and Demand Control function is activated.
IAQ levels:
•ECONOMIC: Actual IAQ value is below low IAQ set point.
•GOOD: Actual IAQ value is between low and high IAQ limits.
•IMPROVING: Actual IAQ value is above high IAQ set point.
Different airflow settings can be set for IMPROVING and GOOD IAQ levels in Service menu.
Setpoint for relative humidity and CO2level can be set in Service menu.
6.5.5 Status line
Status line located at the bottom area of home screen displays information about:
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GB Configuration | 13
List of active alarms. See
chapter 11.1 for more
information.
List of active user functions.
See chapter 6.6 for more
information.
Touching any of these lines will move you to the next page with more detailed list and information about each alarm or
active user function.
6.6 Description of User function icons
Icon Text Description
Heating Connected heater or pre-heater is active and air heating is in process.
Heat recovery Heat recovery from apartment is active.
Cooling Connected cooler is active and air cooling is in process.
Cooling
recovery
Automatic cooling recovery is active when extract air temperature from
apartment is lower than outdoor air temperature and there is a cooling demand
(temperature setpoint is lower than outdoor air temperature).
No cooling recovery with heating demand. If the outdoor air temperature is
higher than then thee indoor air temperature and there is a heating demand,
function Free heating is activated instead.
Free cooling Function decreases indoor air temperature by using only cool outdoor air during
nighttime to save energy consumption.
Moisture
transfer
Function controls the rotation speed of the heat exchanger to prevent moisture
transfer to supply air due to high relative humidity in the extract air.
Function is only available for units with Rotating type heat exchanger.
Defrosting Function prevents formation of the ice on the heat exchanger during cold
outdoor temperatures.
Secondary air
Warm air from the living space is used to defrost the heat exchanger using a
damper inside the outdoor air duct. The unit switches from outdoor air to
secondary air while the extract air fan stops and warm secondary air increases
the temperature inside the heat exchanger.
Vacuum
cleaner
Function sets speed of supply air fan to High level and extract air fan to Low
level to increase air pressure within the apartment for better dust collection
through central vacuum cleaner.
Function can be activated via digital input — Central Vacuum Cleaner
Function.
Always active while digital input is activated.
Cooker Hood
Sets speed of both supply and extract air fans to Maximum level to increase
airflow in the cooker hood.
Function can be activated via digital input — Cooker Hood Function.
User lock
Function indicates that the system is locked with a password and cannot be
edited or settings changed in any way. System must be unlocked first to make
changes.
Configurable
Digital Input
1
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
High–priority function.
Configurable
Digital Input
2
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
Mid–priority function.
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14 | Configuration GB
Configurable
Digital Input
3
Configurable digital input for custom user function. Airflow levels for both fans
are freely configurable.
Low–priority function.
Pressure
Guard
Configurable digital input for pressure guard connection. Airflow levels for both
fans are freely configurable.
6.7 Week Schedule
The unit can be configured to operate at set airflow levels up to two time periods (00:00–23:59) on user
selected days.
Week Schedule is active only during AUTO mode.
6.7.1 Schedule airflow settings
Touch settings icon to go to SCHEDULE AIRFLOW SETTINGS menu. In this menu set airflow level for
scheduled and unscheduled periods. Available levels: Off,Low,Normal,High or Demand.
Set temperature setpoint offset for both periods (-10°C – 0°C).
Demand level is available only if Demand Control or External fan function is active.
6.7.2 Edit schedule
Touch icon at the bottom left corner of the screen to add a new schedule or press EDIT button to modify
already added schedule.
To configure the schedule:
1. Set the time. Touch the START TIME or END TIME values to change time. Use arrow buttons and to increase
or decrease value. Confirm with OK button.
Note:
Scheduled time can start but never end at midnight (00:00). The latest END TIME period is 23:59.
Scheduled time cannot go to the next day.
12 or 24 hour time format can be changed in System Preferences menu.
If necessary, activate second scheduled period and set up time.
2. Once time is set, click on the day(s) when schedule should be active. It is possible to set a separate schedule for each
day.
Already scheduled days are not available for selection for new schedules.
3. Confirm schedule with OK button.
Fig. 3 Week schedule example
Scheduled days are highlighted (pos. 1). First time period (pos. 2) and the second time period (pos. 3) are shown on the
right side of each schedule.
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GB Cooker hood maintenance | 15
7 Cooker hood maintenance
7.1 Cleaning cooker hood
Warning
There is fire hazard if the cooker hood is not cleaned within given intervals.
Fig. 2 Remove cooker hood filter
• The filter is to be cleaned every second month during
normal use. Clean more often during intense use.
• Clean the inside of the cooker hood at least twice a
year.
Remove the filter as shown in the image:
The metal grease filter can be cleaned in a dishwasher or
by hand using a mild detergent or liquid soap. When re-
placing, ensure that it is dry.
The other parts of the cooker hood are wiped with a
damp cloth and mild liquid household cleaner. Never use
abrasive cleaning materials.
8 Maintenance of the unit
Maintenance of the SAVE VTR 150/K should normally be performed 3 - 4 times a year.
8.1 Warnings
Danger
• Make sure that the mains supply to the unit is disconnected before performing any maintenance or
electrical work!
• All electrical connections and maintenance work must be carried out by an authorized installer and in
accordance with local rules and regulations.
Warning
• This product must only be operated by a person who has suitable knowledge or training within this field
or carried out with the supervision of a suitably qualified person.
• Beware of sharp edges during mounting and maintenance. Use protective gloves.
Warning
• All though the mains supply to the unit has been disconnected there is still risk for injury due to rotating
parts that have not come to a complete standstill.
Important
• The installation of the unit and complete ventilation system must be performed by an authorized installer
and in accordance with local rules and regulations.
• The system should operate continuously, and only be stopped for maintenance/service.
• Do not connect tumble dryers to the ventilation system.
• Duct connections/duct ends must be covered during storage and installation.
• Make sure that filters are mounted before starting the unit.
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16 | Maintenance of the unit GB
8.2 Remove/mount the outer front
Fig. 3 Remove/mount the outer front
The outer front is mounted with four pins and is removed
by pushing the locking hock to the left and pulling the
front towards you.
Re-mount the outer front in reverse order.
8.3 Remove/mount the inner front
Fig. 4 Remove/mount the inner front
The inner front is mounted with four screws. Loosen the screws and pull the
inner front towards you.
Mount the inner front and tighten the mounting screws properly to prevent
air leakage.
Note:
When mounting the inner front, note the two guide screws at the
bottom of the inner front. These screws shall be fitted into the
two slots in the inner hatch support bracket.
8.4 Changing filters
Fig. 5 Heat exchanger filters
Danger
Make sure that the Mains supply to the unit is disconnected
before performing any maintenance or electrical work!
The filters are to be changed every 3–15 months, default value is 12 months.
When the filters have been changed the filter timer will reset automatically
after alarm is acknowledged.
The factory installed filters are of filter quality M5/ePM10 50% for the supply
air and M5/ePM10 50% for the extract air filter. The filters need to be re-
placed when polluted. New sets of filters can be acquired from your installer
or wholesaler.
Filter quality M5/ePM10 50% can be installed for supply air filtering.
The filter type is labelled on the top of the filter.
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GB Maintenance of the unit | 17
8.4.1 Resetting the filter time
Once filter is changed, it is necessary to reset filter time. Go to Filter menu (see 6.4 Menu overview, page 8, pos. E)
or if filter alarm is present, click on alarm status line (see 6.5 Home screen, page 8, pos. 5) and select filter alarm. Select
CHANGE FILTER, in the pop up menu define a new filter period and press OK to confirm selection.
Filter time is now reset.
8.5 Checking and cleaning the heat exchanger
Danger
• Make sure that the Mains supply to the unit is disconnected before performing any maintenance or
electrical work!
Fig. 6 Heat exchanger
Even if the required maintenance is carried out, dust will build up in the ex-
changer block. It is therefore of vital importance for the upkeep of a high effi-
ciency that the exchanger block is removed from the unit and cleaned
periodically as illustrated below. Clean the heat exchanger at least every 3
years or when required.
1. Disconnect the rotor power supply and the rotor sensor. The cables are
found beside the rotor at the back.
2. Pull out the rotor towards you. Some force may be needed.
3. Clean the rotor.
Wash in hot soapy water. Do not use detergent containing ammonia. Rinse
using, for instance, a shower handle.
Warning
Ensure the rotor motor is not exposed to moisture
4. Remount the rotor. Don’t forget to reconnect the rotor power and sensor
cables.
8.6 Cleaning the fans
Fig. 7 Extract and supply air fans
Danger
• Make sure that the Mains supply to the unit is disconnected
before performing any maintenance or electrical work!
The motor bearings are life time lubricated and maintenance free.
Even if the required maintenance, such as changing of filters is carried out,
dust and grease may slowly build up inside the fans. This will reduce the
efficiency.
The fans may be cleaned as illustrated in below procedure.
1. Disconnect the fan power cables. The cables are found beside the fan at
the back.
2. Pull out the fans towards you. Some force may be needed.
3. Clean the fans with a cloth or a soft brush. Do not use water. White spirit
can be used to remove obstinate deposits.
Allow the fans to dry properly before remounting.
4. Remount the fans. Don’t forget to reconnect the fan power cables.
8.7 Replacing rotor drive belt
If the alarm Rotor guard is raised, see chapter 11.1, the rotor drive belt may be damaged or broken.
A spare drive belt is already placed on the heat exchanger rotor and delivered with the unit.
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18 | Maintenance of the unit GB
In case both welded belts break it is possible to use joint nipple as a temporarily quick repair solution until the welded
belt can be replaced with a new one. Depending of how the unit is installed, it may be not necessary to remove the
heat exchanger package in order to temporary repair a broken drive belt if the belt pulley can be accessed.
Fig. 8 Rotor drive belt
Temporary belt repair solution
1. Stop the unit by disconnecting the mains.
2. Open and remove the side cover.
3. Remove the broken drive belt.
4. Use tape to attach the drive belt to the rotating heat exchanger, and rotate
the exchanger by hand to get hold of the drive belt.
5. Remove the tape and put the ”empty” end on to the nipple. Press the ends
firmly towards each other and tighten the nipple.
6. Pull the drive belt on to the belt pulley and rotate the exchanger by hand. Check that the belt pulley rotates.
Note:
If the drive belt slips, the drive belt may be too long and needs to be shortened. Cut the drive belt 5 mm
and go to step 5.
7. Replace and lock the side cover and connect the unit to mains.
8. Check that the alarm has ceased on the Control Display.
Note:
If the alarm remains, check the rotor sensor.
DCB
A
E
D
11
22
C
B
11
22
A
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GB Duct system maintenance |19
8.8 Overheat protection reset button
If the supply air temperature is low, it can indicate that the over heat protec-
tion is triggered. The overheat protection can be reset by pressing the reset
button.
9 Duct system maintenance
9.1 Cleaning extract louvres and supply air diffusers
The system supplies fresh air to your home and extracts the used indoor air via the duct system and diffusers/louvres.
Diffusers and louvres are mounted in ceilings/walls in bedrooms, living room, wet rooms, WC etc. Remove diffusers
and louvres and wash in hot soapy water as required (diffusers/louvres must not be exchanged). Cleaning of diffusers/
louvres can be done as necessary.
9.2 Checking the outdoor air intake
Leaves and pollution could plug up the air intake grille and reduce the capacity. Check the air intake grille, and clean as
necessary. It is recommended to do this at least twice a year.
9.3 Checking the roof cowl (if fitted)
The roof cowl (if fitted) connected to the exhaust air duct needs to be checked at least twice a year and cleaned if
necessary.
9.4 Checking and cleaning the duct system
Dust and grease deposits may build up in the duct system, even if required maintenance such as changing of filters is
being carried out. This will reduce the efficiency of the installation.
The duct runs should therefore be cleaned/changed when necessary. Steel ducts can be cleaned by pulling a brush
soaked in hot soapy water through the duct via diffuser/louvre openings or special inspection hatches in the duct sys-
tem (if fitted).
It is recommended to do this every 5 years and is normally carried out by authorized companies specialized in this area.
10 Troubleshooting
If problems should occur, please check the items below before calling your service representative.
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20 | Troubleshooting GB
Malfunction Action
Fans do not start
1. Check the HMI for alarms.
2. Check that all fuses and fast couplings are connected (main power supply and fast
couplings for supply and extract air fans).
3. Check that the week schedule is ON and running in AUTO mode. The week schedule
might be in OFF mode with the air flow set to OFF (chapter 6.7).
Reduced airflow
1. Check the HMI for alarms. Some alarms can reduce the airflow to LOW if active.
2. The unit could be in defrost mode. This reduces the fan speed and in some cases shuts
down the supply air fan completely during the defrosting cycle. The fans go back to
normal after finished defrosting. There should be a defrosting function icon visible in the
APP or HMI home screen if defrosting is active.
3. If the outdoor air temperature is below 0°C (Outdoor air temperature sensor (OAT)
measures < 0°C) outdoor airflow compensation function can be active (if enabled). Fan
speed (Supply or Supply/Extract air fans) is linearly reduced for decreasing outdoor air
temperature.
4. Check if temporary user mode that reduces airflow is not activated, for example AWAY,
HOLIDAY, etc. Also check digital inputs CENTRAL VACUUM CLEANER and COOKER HOOD.
5. Check setting of airflow in the HMI.
6. Check week schedule settings (chapter 6.7).
7. Check filters. Is change of filters required?
8. Check diffusers/louvres. Is cleaning of diffusers/louvres required?
9. Check fans and heat exchange block. Is cleaning required?
10.Check if the buildings air intake and roof unit (exhaust) have been clogged.
11.Check visible duct runs for damage and/or build up of dust/pollution.
12.Check diffuser/louvre openings.
The unit cannot be
controlled (control
functions are stuck)
1. Reset control functions by pulling out the plug for 10 seconds.
2. Check the modular contact connection between the HMI and the main printed circuit
board.
Low supply air
temperature
1. Check the display for alarms.
2. Check the active user functions in HMI screen if Defrosting function is running.
3. Check set supply air temperature in the HMI.
4. Check if ECO mode is activated in HMI (it is a power saving function and prevents the
heater from activating).
5. Check if user modes HOLIDAY,AWAY or CROWDED are activated in the HMI or via a
hardwired switch.
6. Check the analogue inputs in the service menu to verify that the temperature sensors
are functioning correctly.
7. In case of installed electrical/other re-heater battery: Check if the overheat protection
thermostat is still active. If necessary, reset by pressing the red button on the front plate
of the electrical re-heater.
8. Check if the extract filter must be changed.
9. Check if the unit has a re-heater battery connected. At very cold outdoor conditions an
electrical or water heating battery might be necessary. A re-heater battery can be
acquired as an accessory.
Noise/vibrations
1. Clean fan impellers.
2. Check that the screws holding the fans are tightened.
3. Check that the anti vibration lists are fitted to the mounting bracket and to the back of
the unit.
4. Check that the rotor belt is not slipping if the unit has rotating heat exchanger.
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