System air SAVE VTR 300/B User manual

Document in original language | 211476 · A001
SAVE VTR 300/B
User Manual GB

211476 | A001
© 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 ......................................1
2 Warnings.......................................................1
3 Type label......................................................2
3.1 QR code...............................................2
4 Product description..........................................2
4.1 Left and Right models .............................2
5 SAVECair control .............................................3
5.1 General................................................3
5.2 Startup wizard .......................................3
5.3 Common symbols...................................3
5.4 Menu overview .....................................4
5.5 Home screen.........................................5
5.5.1 User modes ..............................5
5.5.2 Temperature settings ..................7
5.5.3 Airflow settings .........................7
5.5.4 Indoor Air Quality .......................8
5.5.5 Status line ................................8
5.6 Description of User function icons ..............8
5.7 Week Schedule....................................9
5.7.1 Schedule airflow settings .............9
5.7.2 Edit schedule ............................9
6 Maintenance of the unit.................................. 10
6.1 Warnings............................................ 10
6.2 Open the front hatch............................. 10
6.3 Changing filters.................................... 10
6.4 Resetting the filter time ......................... 11
6.5 Checking and cleaning the heat
exchanger .......................................... 11
6.6 Cleaning the fans ................................. 12
6.7 Replacing rotor drive belt ....................... 13
6.7.1 Heat exchanger
mounted ................................ 14
6.7.2 Heat exchanger
removed ................................ 14
6.8 Overheat protection reset button ............. 15
7 Duct system maintenance ........ ............. .......... 15
7.1 Cleaning extract louvres and supply air
diffusers............................................. 15
7.2 Checking the outdoor air intake ............... 15
7.3 Checking the roof cowl (if fitted).............. 15
7.4 Checking and cleaning the duct
system ..............................................15
8 Troubleshooting............................................ 16
9 Alarms........................................................17
9.1 Alarm list............................................ 17

Disposal and recycling | 1
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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2| Type label
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)
3.1 QR code
QR code is an optical label that contains the list of spare parts and documentation. The QR code label can be found next
to the type label.
Use a mobile application or any other QR code reader to access its contents.
Fig. 2 Example of QR code label
4 Product description
The SAVE VTR 300/B is a heat recovery ventilation unit with a built in rotating heat exchanger. The SAVE VTR 300/B is
suitable for houses with up to 240 m2heated living area. It supplies filtered outdoor air to residential areas and extract
air from bathroom, kitchen and wet rooms.
SAVE VTR 300/B is equipped with a 1670 W electrical re-heater battery.
4.1 Left and Right models
There are two model options, right (R) and left (L) model. The different models are recognized by the placing of the in-
ternal components and the supply air outlet, which is situated on left side of the unit on an (L) unit and on the right hand
side on an (R) unit..
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SAVECair control | 3
Note:
This document describes a left (L) model. The inside of a right (R) model is mirrored.
5 SAVECair control
5.1 General
SAVECair is 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.
5.2 Startup wizard
During the first power up of the unit, you will be asked to set:
• menu language
• time and date
• airflow control type (Manual/RPM) and airflow level values
• heater type (None/Electrical/Water/Change-over)
If the start-up wizard is cancelled it will start again during next power up of the unit, this will continue until start-up wiz-
ard is successfully finished.
5.3 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
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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4| SAVECair control
5.4 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
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SAVECair control | 5
5.5 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
5.5.1 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.
Settings of all modes can be modified in Service menu.
5.5.1.1 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.
5.5.1.2 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:
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6| SAVECair control
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.
Delay 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.
Delay 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.
Delay 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.
Delay 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.
Delay 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.
5.5.1.3 Digital input functions
Digital input functions always active while digital input is activated.
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 supply air fan to High level and extract air fan to Low level to
increase air pressure within the apartment for better airborne grease and steam
collection in the kitchen.
Function can be activated via digital input — Cooker Hood Function.
5.5.1.4 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.
Digital input and Mode hierarchy:
1. EXTERNAL STOP
2. FIREPLACE function
3. COOKER HOOD,CENTRAL VACUUM CLEANER,CROWDED,REFRESH functions
4. AWAY,CROWDED functions
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SAVECair control | 7
5.5.2 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 SET 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.
5.5.2.1 ECO mode
ECO mode is a power saving function that can be activated in SET TEMPERATURE menu.
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.
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
5.5.3 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.
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8| SAVECair control
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.
5.5.4 Indoor Air Quality
The unit automatically controls indoor humidity and/or CO
2levels 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.
5.5.5 Status line
Status line located at the bottom area of home screen displays information about:
List of active alarms. See
chapter 9.1 for more
information.
List of active user functions.
See chapter 5.6 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.
5.6 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.
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SAVECair control | 9
Icon Text Description
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 supply air fan to High level and extract air fan to Low level to
increase air pressure within the apartment for better airborne grease and steam
collection in the kitchen.
If a cooker hood with integrated fan is used, then it is recommended to set
airflow levels of both fans to Normal.
Function can be activated via digital input — Cooker Hood Function.
Always active while digital input is activated.
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.
5.7 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.
5.7.1 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.
5.7.2 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.
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.
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10 | Maintenance of the unit
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.
Scheduled time period is displayed in blue colour on the clock (pos. 4).
6 Maintenance of the unit
Maintenance of the SAVE VTR 300/B should normally be performed 3 - 4 times a year.
6.1 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.
6.2 Open the front hatch
Danger
• Make sure that the Mains supply to the unit is disconnected before performing any maintenance or
electrical work!
Open the hatch with the two latches and swing the hatch open.
6.3 Changing 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.
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Maintenance of the unit | 11
The factory installed filters are of filter quality F7 for the supply air and G3 for the extract air filter. The filters need to be
replaced when polluted. New sets of filters can be acquired from your installer or wholesaler.
Filter quality G3 can be installed for supply air filtering.
The filter type is labelled on the top of the filter.
1. Stop the unit by disconnecting the mains.
2. Open the front hatch. See chapter 6.2.
3. Pull out the filters towards you. Some force may be needed.
4. Insert the new filters. Make sure that the correct filter types are inserted.
5. Close and lock the front hatch and connect the unit to mains.
6. Reset the filter time. See chapter 6.4.
6.4 Resetting the filter time
Once filter is changed, it is necessary to reset filter time. Go to Filter menu (see 5.4 Menu overview, page 4, pos. E)
or if filter alarm is present, click on alarm status line (see 5.5 Home screen, page 5, 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.
6.5 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!
Warning
Risk of personal injury! The heat exchanger weighs about 14 kg. There is a risk that the heat exchanger falls
out of the unit.
Make sure that small children are not beneath the unit when the heat exchanger is removed!
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12 | Maintenance of the unit
Fig. 4 Heat exchanger
Even if the required maintenance is carried out, dust will build up in the exchanger block. It is therefore of vital impor-
tance for the upkeep of a high efficiency that the exchanger block is removed from the unit and cleaned periodically as
described below. Clean the heat exchanger at least every 3 years or when required.
1. Stop the unit by disconnecting the mains.
2. Open the front hatch. See chapter 6.2.
3. Disconnect the heat exchanger power supply and the rotor sensor. Both cables are found beside the heat exchanger.
4.
Warning
Risk of personal injury! The heat exchanger weighs about 14 kg. There is a risk that the heat exchanger
falls out of the unit.
Pull out the heat exchanger towards you. Some force may be needed.
5. Clean the rotor.
Wash in hot soapy water. Do not use detergent containing ammonia. Rinse using, for instance, a shower handle or
carefully with compressed air.
Warning
Ensure the rotor motor is not exposed to moisture
6. Remount the heat exchanger. Don’t forget to reconnect the heat exchanger power and sensor cables.
7. Close and lock the front hatch and connect the unit to mains.
6.6 Cleaning the fans
Danger
• Make sure that the Mains supply to the unit is disconnected before performing any maintenance or
electrical work!
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Maintenance of the unit | 13
Fig. 5 Extract and supply air fans
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 described below.
1. Stop the unit by disconnecting the mains.
2. Open the front hatch. See chapter 6.2.
3. Disconnect the fan power cables. The cables are found beside the fans.
4. Pull the fans towards you. Some force may be needed.
5. 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.
6. Remount the fans. Don’t forget to reconnect the fan power cables.
7. Close the front hatch and connect the unit to mains.
6.7 Replacing rotor drive belt
Note:
Depending on model, left or right, it may be necessary to remove the heat exchanger in order to replace a
broken drive belt since the belt pulley cannot be accessed.
If the rotor motor is placed at the back of the unit, it is recommended to remove the heat exchanger to
change the drive belt, see chapter 6.7.2.
If the alarm Rotor guard is raised, see chapter 9.1, the rotor drive belt may be damaged or broken.
The replacement drive belt (1) is adjustable and delivered with a nipple attached in one end.
Danger
• Make sure that the Mains supply to the unit is disconnected before performing any maintenance or
electrical work!
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14 | Maintenance of the unit
Warning
Risk of personal injury! The heat exchanger weighs about 14 kg. There is a risk that the heat exchanger falls
out of the unit.
Make sure that small children are not beneath the unit when the heat exchanger is removed!
Fig. 6 Rotor drive belt
6.7.1 Heat exchanger mounted
1. Stop the unit by disconnecting the mains.
2. Open the front hatch.
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.
6. Press the drive-belt ends firmly towards each other to secure the nipple.
7. 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 6.
8. Close and lock the front hatch and connect the unit to mains.
9. Check that the alarm has ceased on the Control Display.
Note:
If the alarm remains, check the rotor sensor.
6.7.2 Heat exchanger removed
1. Stop the unit by disconnecting the mains.
2. Open the front hatch.
3. Disconnect the heat exchanger power supply and the rotor sensor. The cables are found beside the heat exchanger
at the back.
4. Pull out the heat exchanger towards you. Some force may be needed.
5. Remove the broken drive belt.
6. Apply the new drive belt around the heat exchanger.
7. Press the drive-belt ends firmly towards each other to secure the nipple.
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Duct system maintenance |15
8. 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 7.
9. Mount the heat exchanger. Don’t forget to reconnect the rotor power and sensor cables.
10.Close the front hatch and connect the unit to mains.
11.Check that the alarm has ceased on the Control Display.
Note:
If the alarm remains, check the rotor sensor.
6.8 Overheat protection reset button
If the supply air temperature is low, it can indicate that the over heat protection is triggered. The overheat protection
can be reset by pressing the reset button (1).
Fig. 7 Overheat protection reset button
7 Duct system maintenance
7.1 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.
7.2 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.
7.3 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.
7.4 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.
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16 | Troubleshooting
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.
8 Troubleshooting
If problems should occur, please check the items below before calling your service representative.
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 5.7).
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 5.7).
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.
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