System air SAVE VSR 150 User manual

Document translated from English | 211556 · A002
SAVE VSR 150
GB User Manual................................................2
SV Användarhandbok .....................................28
DE Bedienungsanleitung .................................54
FI Käyttöohje................................................82

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GB
User Manual GB
© Copyright Systemair UAB
All rights reserved
E&OE
Systemair UAB reserves the rights to change 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 Product description..........................................6
5 Configuration .................................................6
5.1 General................................................6
5.2 Startup wizard .......................................6
5.3 Common symbols...................................7
5.4 Menu overview .....................................7
5.5 Home screen.........................................8
5.5.1 User modes ..............................8
5.5.2 Temperature settings ................ 10
5.5.3 Airflow settings ....................... 10
5.5.4 Indoor Air Quality ..................... 11
5.5.5 Status line .............................. 11
5.6 Description of User function icons ............ 11
5.7 Week Schedule..................................12
5.7.1 Schedule airflow
settings.................................. 12
5.7.2 Edit schedule .......................... 12
6 Maintenance of the unit.................................. 13
6.1 Warnings............................................ 13
6.2 Open the side cover.............................. 13
6.3 Changing filters.................................... 14
6.3.1 Filters accessed through the
side cover............................... 14
6.3.2 Filters accessed through the
filter cover plates ..................... 15
6.4 Resetting the filter time ......................... 15
6.5 Checking and cleaning the heat
exchanger .......................................... 15
6.6 Cleaning the fans ................................. 16
6.7 Replacing rotor drive belt ....................... 17
6.7.1 Temporary drive belt repair
solution when the belt pulley can be
accessed ................................ 20
6.7.2 Temporary drive belt repair
solution when the belt pulley cannot
be accessed ............................ 20
6.8 Overheat protection reset button............. 21
7 Duct system maintenance ............................... 21
7.1 Cleaning extract louvres and supply air
diffusers............................................. 21
7.2 Checking the outdoor air intake ............... 22
7.3 Checking the roof cowl (if fitted).............. 22
7.4 Checking and cleaning the duct
system ..............................................22
8 Troubleshooting............................................ 22
9 Alarms........................................................23
9.1 Alarm list............................................ 23

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 Product description
The SAVE VSR 150/B is a heat recovery ventilation unit with two built in rotating heat exchangers. The SAVE VSR 150/B
is suitable for houses with up to 100 m2heated living area. It supplies filtered outdoor air to residential areas and ex-
tract air from bathroom, kitchen and wet rooms.
SAVE VSR 150/B is equipped with a 500 W electrical re-heater battery.
5 Configuration
5.1 General
SAVE VSR 150/B 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.
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.
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GB Configuration | 7
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
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.
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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8| Configuration GB
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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GB Configuration | 9
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.
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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10 | Configuration GB
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 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.
5.5.2.1 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.
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.
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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.
5.5.4 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.
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.
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12 | Configuration GB
Icon Text Description
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 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.
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.
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GB Maintenance of the unit | 13
Already scheduled days are not available for selection for new schedules.
3. Confirm schedule with OK button.
Fig. 2 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.
6 Maintenance of the unit
Maintenance of the SAVE VSR 150/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 maintenance work must be carried out by an authorized installer and in accordance with
local rules and regulations.
Warning
• The system should operate continuously, and only be stopped for maintenance/service
• Beware of sharp edges during maintenance. Use protective gloves.
• Make sure that filters are mounted before starting the unit
6.2 Open the side cover
Danger
• Make sure that the Mains supply to the unit is disconnected before performing any maintenance or
electrical work!
• If the unit is ceiling mounted with the side cover facing downwards, be careful when opening the side
cover.
Loosen the four Philips screws (1) to open the side cover. To remove the side cover, remove the pins in the hinges.
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14 | Maintenance of the unit GB
Fig. 3 Open the side cover
Note:
Do not forget to tighten screws back after the maintenance!
6.3 Changing filters
Danger
Make sure that the Mains supply to the unit is disconnected before performing any maintenance or
electrical work!
Note:
Depending on how the unit is mounted, the filters are accessed differently. The filters are accessed either by
opening one side cover or by removing the filter cover plates on the same side as the electrical connection
box.
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 F7/ePM1 55% for the supply air and G3/ISO Coarse 50% 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/ISO Coarse 50% can be installed for supply air filtering.
The filter type is labelled on the filter.
6.3.1 Filters accessed through the side cover
Fig. 4 Supply and extract air filters
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GB Maintenance of the unit | 15
1. Stop the unit by disconnecting the mains.
2. Open the side cover. 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. Replace and fasten the side cover and connect the unit to mains.
6. Reset the filter time. See chapter 6.4.
6.3.2 Filters accessed through the filter cover plates
1. Stop the unit by disconnecting the mains.
2. Loosen the four screws on each filter cover plate marked Extract and Supply air filter respectively.
3. Remove the filter cover plates.
4. Pull out the filters towards you. Some force may be needed.
5. Insert the new filters. Make sure that the correct filter types are inserted.
6. Remount and fasten the filter cover plates and connect the unit to mains.
7. 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 7, pos. E)
or if filter alarm is present, click on alarm status line (see 5.5 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.
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 10 kg. There is a risk that the heat exchanger falls
out of the unit.
If the unit is ceiling mounted with side cover facing downwards, the heat exchanger may fall out if not
secured.
Make sure that small children are not beneath the unit when the heat exchanger is removed!
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16 | Maintenance of the unit GB
Fig. 5 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 side cover. See chapter 6.2.
3. Remove the extract air filter.
4. Disconnect the heat exchanger cable in the extract air chamber (2).
5. Remove the two brackets (1) that holds the head exchanger package.
6. Take out the heat exchanger package.
7. Clean the rotors.
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.
8. Remount the heat exchanger package and secure it with the screws and the brackets.
9. Reconnect the heat exchanger cables to the motor and sensor.
10.Insert the extract air filter.
11.Close and fasten the side cover 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!
The fans are removed differently depending on how the unit is installed.
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GB Maintenance of the unit | 17
In this view, figure 6, the extract air fan (1) is removed by loosening two screws by hand and the supply air fan (2) by
loosening four screws using a screwdriver. If the other side cover is opened, the supply air fan is removed by loosening
two screws by hand and the extract air fan is removed by loosening four screws using a screwdriver.
Fig. 6 Extract (1) and supply (2) 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 side cover. See chapter 6.2.
3. Loosen the mounting screws (1) and pull the fans towards you.
Disconnect the fan power cables. The cables are found beside the fans.
4. 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.
5. Remount the fans. Don’t forget to reconnect the fan power cables.
6. Close and lock the side cover and connect the unit to mains.
6.7 Replacing rotor drive belt
Danger
Make sure that the Mains supply to the unit is disconnected before performing any maintenance or
electrical work!
If the alarm Rotor guard is raised, see chapter 9.1, the rotor drive belt may be damaged or broken.
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18 | Maintenance of the unit GB
Fig. 7 Rotor drive belt (1), belt pulley (2) and location of heat exchanger cables (3)
SAVE VSR 150/B units are delivered with two welded drive belts (1) — one mounted and one as extra if replacement is
required. Spare belt is enclosed in a plastic pocket with manuals.
Warning
If the unit is ceiling mounted with side cover facing downwards, the heat exchanger may fall out if not
secured. The heat exchanger weighs about 10 kg.
1. Stop the unit by disconnecting the mains.
2. Open the side cover.
3. Disconnect heat exchanger cables in the extract air chamber.
4. If heat exchanger cables are not visible, then they are behind the filter in the extract air chamber (4). Loosen two
screws (1) holding the filter bracket. Remove the bracket (2). Pull out the extract air filter (3). Then disconnect the
heat exchanger cables.
5.
Warning
If the unit is mounted with a side cover facing downwards, do not remove the screws in the slots. They
will prevent the heat exchanger from falling out accidentally.
Loosen four screws (1) and two brackets (2) holding the heat exchanger.
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GB Maintenance of the unit | 19
6. Take out the heat exchanger package.
7. Loosen 8 screws at the front and 4 screws at the back and then 2 screws holding heat exchangers in order to remove
a side gable.
8. Remove side gable (1). Remove the broken drive belt (2).
9. Place the new drive belt (1) around both heat exchangers (3) and the belt pulley (2). Make sure the new drive belt is
aligned or else it can slip off.
10.Remount the side gable and secure it with the screws.
11.Rotate the exchanger by hand. Check that the belt pulley rotates and the belt do not slip.
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20 | Maintenance of the unit GB
12.Remount the heat exchanger package and secure it with the screws.
13.Reconnect the heat exchanger cables to the motor and sensor.
14.Insert the extract air filter if it was removed. Remount filter bracket and secure it with screws.
15.Close and fasten the side cover and connect the unit to mains.
16.Check that the alarm has ceased on the Control Display.
Note:
If the alarm remains, check the rotor sensor.
6.7.1 Temporary drive belt repair solution when the belt pulley can be accessed
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.
1. Stop the unit by disconnecting the mains.
2. Open the side cover.
3. Use tape to attach the drive belt to one of the heat exchangers. Rotate the exchanger by hand to get hold of the drive
belt.
4. Pull the drive belt on to the belt pulley and use tape to attach the drive belt on to the other heat exchanger.
5. Rotate the exchanger by hand to get hold of the drive belt.
6. Remove the tape and put the ”empty” end (2) on to the joint nipple (1).
7. Press the ends completely together to secure a tight joint.
8. Pull the drive belt on to the belt pulley and rotate the exchanger by hand. Check that the belt pulley rotates.
9. Close and lock the side cover and connect the unit to mains.
10.Check that the alarm has ceased on the Control Display.
Note:
If the alarm remains, check the rotor sensor.
6.7.2 Temporary drive belt repair solution when the belt pulley cannot be accessed
If the belt pulley cannot be accessed, the heat exchanger package have to be removed in order to temporary repair a
broken drive belt.
1. Stop the unit by disconnecting the mains.
2. Open the side cover.
3. Disconnect the heat exchanger cable in the extract air chamber.
4.
Warning
If the unit is mounted with a side cover facing downwards, do not remove the screws in the slots. They
will prevent the heat exchanger from falling out accidentally.
Loosen four screws and two brackets holding the heat exchanger.
5. Take out the heat exchanger package.
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