OSTBERG HERU 100 S EC Troubleshooting guide

HERU S, HERU T HERU S, HERU T
OPERATION & MAINTENANCE | EN
DRIFT & UNDERHÅLL | SE
DRIFT OG VEDLIKEHOLD | NO
Other languages in digital format can be downloaded at www.ostberg.com

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OPERATION & MAINTENANCE | EN .................................5
DRIFT & UNDERHÅLL | SE ..............................................41
DRIFT OG VEDLIKEHOLD | NO .......................................79

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The manufacturer cannot be held liable for injury and damage to people or property that are caused by incor-
rect installation, start up and/or incorrect use of the unit and/or failure to follow the processes and instructions
that are set out in the manual. For safety reasons it is essential to follow the instructions in the manual. The
warranty will be immediately invalidated in the event of injury that is caused by failure to follow the instruc-
tions. Installation and commissioning must be performed by a professional in order for the warranty to apply.
Shortcuts:
• Log in Service menu: Enter code 1199.
• Download the latest firmware version: Firmware. FIRMWARE MODBUS
• Download complete Modbus register: Modbus.
• Download the app: HERU IQ App. APPLE GOOGLE
• Download wiring diagrams via the links below.
• Links to product information www.ostberg.com
HERU S
HERU 100 S EC HERU 160 S EC HERU 200 S EC HERU 300 S EC
HERU T
HERU 100 T EC HERU 160 T EC HERU 200 T EC HERU 300 T EC

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EN | Table of contents
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Table of Content
1 Product overview and use.......................................................................6
1.1 Product description ............................................................................................................6
1.2 Control functions................................................................................................................7
1.2.1 Regulating the temperature................................................................................................7
1.2.2 Fan capacity .......................................................................................................................7
2 Safety........................................................................................................8
2.1 Warnings .............................................................................................................................8
2.2 General safety.....................................................................................................................8
2.3 Declaration of conformity................................................................................................10
3 Warranty.................................................................................................11
3.1 Extent of the warranty.....................................................................................................11
3.2 General limitations in the warranty................................................................................11
3.3 Limitations in the warranty.............................................................................................11
3.4 Service conditions during the warranty period .............................................................11
3.5 Corrective measures in the event of detected faults.....................................................11
4 Operation ...............................................................................................12
4.1 Entering the basic settings for IQC display.....................................................................12
4.2 Pairing units......................................................................................................................13
4.3 The display mode — Home screen simple and advanced..............................................14
4.3.1 Home screen simple .........................................................................................................14
4.3.2 Home screen advanced.....................................................................................................15
4.3.3 Select preset home screen ................................................................................................15
4.4 Use the main menu ..........................................................................................................15
4.5 Temperature regulation ...................................................................................................15
4.6 Boost..................................................................................................................................16
4.6.1 Boosting the unit..............................................................................................................16
4.6.2 Change operating time for boost......................................................................................16
4.7 Overpressure.....................................................................................................................16
4.7.1 Activate overpressure........................................................................................................16
4.7.2 Change operating time and compensation for overpressure function................................16
4.8 Activate away mode ........................................................................................................17
4.9 Activate screen lock..........................................................................................................17
4.10 Programming ..................................................................................................................17
4.11 Activate night cooling....................................................................................................18
4.12 Turn the unit off and on.................................................................................................18
4.13 Use the alarm menu. ......................................................................................................18
4.14 Change settings..............................................................................................................19
4.15 Update software in the ventilation unit.......................................................................19
4.16 Installing HERU IQ App ..................................................................................................20
5 Maintenance...........................................................................................21
5.1 Maintenance schedule .....................................................................................................21
5.2 Maintenance .....................................................................................................................22
5.2.1 Maintenance every six months..........................................................................................22
5.2.2 Annual maintenance ........................................................................................................22
5.3 Accessories and spare parts .................................................................................................24
6 Technical data.........................................................................................25
7 Menu structure in the wireless IQC display .........................................26
8 Troubleshooting.....................................................................................36
8.1 Alarm.................................................................................................................................36
8.2 Other malfunctions ..........................................................................................................37
8.3 Troubleshooting chart......................................................................................................38

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EN | Product overview and use
1 Product overview and use
1.1 Product description
The energy recovery units HERU S and HERU T are designed for supply air and exhaust air ventilation with
cooling and heat recovery.
The unit
• is equipped with an inbuilt electric after heater.
• is supplied with ePM1 filters.
• has a wireless display for operation and monitoring of the unit.
• has Modbus communication via RS485.
HERU S and HERU T can be used in the home, in the office, in apartments etc., where there is a need for:
• high temperature efficiency
• high temperature efficiency
• energy saving
• low sound levels
• safe operation
• high reliability

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1.2 Control functions
1.2.1 Regulating the temperature
The air temperature can be regulated for either constant supply, room or exhaust air temperature.
• To regulate room temperature, a sensor must be positioned in the room (accessory).
• The unit’s inbuilt exhaust air sensor is used for exhaust air temperature.
• If the selected mode does not maintain the desired temperature, regulation moves to the next mode.
There are 5 modes for regulating temperature:
1 Cooling recovery and/or after cooling:
In climate conditions where the rotating heat exchanger is not adequate to achieve the
desired supply air temperature, the unit also controls a cooling battery (e.g. via geothermal
heating) when the cooling recovery from the rotor is not sufficient to maintain the desired
temperature. This mode can also be used if this is not possible using cooling recovery.
2 Cooling recovery:
The rotating heat exchanger starts when cooling recovery is possible in order to maintain
a lower supply air temperature.
3 Outdoor temperature = desired temperature:
When the outdoor temperature is the same as the desired supply air temperature,
the rotating heat exchanger stops.
4 Heat recovery:
The rotating heat exchanger starts to recover the warm indoor temperature.
5 Heat recovery and/or after heat:
In climate conditions where the rotating heat exchanger is not adequate to achieve the
desired supply air temperature, the unit can also control either the inbuilt electric after heater
or a heating battery.
1.2.2 Fan capacity
Minimum airflow is set to suit the minimum requirement for ventilation. The basic setting is set to essential
airflow for the ventilation. Maximum airflow is the airflow that is set to obtain higher airflow, if needed.
The airflow (the fan speed) can be controlled by a program planner, which can be programmed with specific
times when the fan will switch from one speed to another.
Using the program planners, different fan speeds can be programmed, such as lowest, highest or standard fan
speed. The fan speed can also be regulated by a carbon dioxide (CO2) and humidity (RH) sensor so that the
unit increases the airflow as much as required in order to maintain the value once the value is exceeded.
”Night cooling” is a function that means you can use the cold outdoor temperature at night to cool the in-
door temperature. The fan speed is boosted when the difference between outdoor and exhaust air tempera-
ture lies within the programmed limits.
2
1
34
5

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EN | Safety
2 Safety
2.1 Warnings
WARNING
A warning states a risk of personal injury.
CAUTION
Caution states a risk of damage to equipment.
2.2 General safety
WARNING
In accordance with IEC 60335-2-7.12, this apparatus is not intended to be used by people
(including children) who have physical, sensory or psychological impairment, or lack of expe-
rience and knowledge, unless they have received guidance and instruction on how to use the
apparatus by a person who is responsible for their safety. Children must be supervised to
ensure that they do not play with the apparatus.
WARNING
Watch out for sharp edges and corners on the HERU unit.
WARNING
Protective gloves must be worn due to the risk of cuts or injury.
WARNING
The unit’s ducts must be connected, and doors and/or cover closed and locked before the unit
is started in order to avoid the risk of personal injury from rotating parts.
WARNING
The power supply to the HERU unit must be disconnected for all service and maintenance.
WARNING
The electric after heater may remain hot even after the power has been disconnected for
service and maintenance.
WARNING
All changes or additions of electrical components must be performed by a qualified electrician.
WARNING
Breathing protection and protective clothing must be used due to the risk of breathing in and
spreading dust when handling used air filters.
CAUTION
Always turn off the unit with the wireless IQC Display before cutting the power.
CAUTION
The safety switch must not be used for normal starting and stopping of the unit.
Use the wireless IQC Display that is provided.
CAUTION
The safety switch must be set to mode 0 after the unit has been turned off before service can
be started.
CAUTION
Do not connect an exhaust air type tumble dryer or drying cabinet to the system due
to the high air humidity.

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CAUTION
The unit must not be turned off for longer periods unless the duct connections for outdoor air
and extract air are re-plugged due to the risk of condensation and freezing.
CAUTION
In the event of any interruption in power, the settings will be saved. Date and Time are saved
for 24 hours. In longer interruptions, Date and Time must be reset.

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EN | Safety
EU DECLARATION OF CONFORMITY
We hereby confirm that our products comply with the requirements in the following
EU-directives and harmonised standards and regulations.
Manufacturer: H. ÖSTBERG AB
Industrigatan 2
SE-774 35 Avesta, Sweden
Tel No [phone]
Fax No [phone]
http://www.ostberg.com
[email protected]
VAT No SE556301220101
Products: Heru S Next Generation, Heru T Next Generation
This EU declaration is applicable only if the installation is made in accordance with the enclosed installation instructions
and that the product has not been modified.
Low Voltage Directive (LVD) 2014/35/EU
Harmonised standards:
xEN 60335-1
xEN 60335-2-40
xEN 60335-2-30
Radio Equipment Directive (RED) 2014/53/EU
Harmonised standards:
xEN 300 220
Directive for Electromagnetic Compatibility (EMC) 2014/30/EU
Harmonised standards:
xEN 303 446-1 (EN 55014-1, EN 55014-2, EN 61000-3-2, EN 61000-3-3)
xEN 301 489-3
Machinery Directive (MD) 2006/42/EC
Harmonised standards:
xEN ISO 12100
xEN ISO 13857
xEN 60204-1
Ecodesign Directive 2009/125/EC
Harmonised regulation:
x1253/2014 Ecodesign requirements for ventilation units
x1254/2014 Energy labeling of residential ventilation units
RoHS Directive 2011/65/EU
Harmonised standards:
xEN 50581
Avesta 2019-10-15 Mikael Östberg
Technical development Manager
2.3 Declaration of conformity

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3 Warranty
The warranty’s validity according to the purchase agreement is calculated from the day of purchase.
3.1 Extent of the warranty
The warranty covers faults that occur during the warranty period that have been notified to the dealer or
which have been verified by H.Östberg AB (underwriter) or the warranty provider’s representative. Faults are
defects in manufacture and materials as well secondary failures that occur due to these.
The above faults must be remedied so that the product is operational.
3.2 General limitations in the warranty
The warranty provider’s liability is limited according to these warranty conditions and the warranty does not
cover injury or damage to people or property. Verbal promises that are made in addition to the warranty
agreement are not binding on the warranty provider.
3.3 Limitations in the warranty
The warranty applies on condition that the product is used in the normal manner or under equivalent cir-
cumstances and that the user instructions are followed.
The warranty does not cover faults that are caused by:
• Transport of the product.
• Unintended use or overloading of the product.
• Failure on the part of the user to follow the instructions regarding installation, use,
maintenance and care.
• Incorrect installation or incorrect positioning of the product.
• Conditions that are not the responsibility of the warranty provider, e.g. excessive variations
in voltage, lightning strike, fire and other accidents.
• Repairs, maintenance and changes that are performed by unauthorised parties.
The warranty does not cover:
• Faults that do not affect operation, for example scratches to the surfaces.
• Parts that are exposed to greater risk of fault than normal due to handling or normal wear
and tear, for example lamps, glass, ceramics, paper or plastic parts, filters and fuses.
• Settings, information on use, care, service or cleaning that are typically described in the user
instructions, or damage that is caused by the user failing to observe warnings or installation
instructions, or inspection of such.
The warranty provider is only responsible for the operation if approved accessories are used. The warranty
does not cover product faults that are caused by other manufacturers’ accessories or equipment.
The unit’s current settings must be recorded in the installation and assembly instructions at installation in
order to avoid costs in the event of fault. The warranty provider is not responsible for costs such as adjustment
costs when changing fans and mainboards in the unit.
3.4 Service conditions during the warranty period
The conditions apply according to the agreement with the local dealer.
3.5 Corrective measures in the event of detected faults
If a fault is detected, the customer must notify this to the dealer.
Shipping damage must be notified to the shipping agent upon delivery. State which product applies (part
and serial number as per the name plate) and describe the fault and how this has occurred as accurately as
possible.
In order for warranty repair to be performed, the customer must demonstrate that the warranty is valid by
presenting a purchase receipt. Once the warranty period has expired, claims that were not made in writing
before expiry of the warranty period will not be valid. In other regards, this shall occur in accordance with the
sales conditions.

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EN | Operation
4 Operation
For information on active view in the wireless IQC Display, press the i-button in the display’s status bar.
WARNING
The unit’s duct connections must be duct connected, and doors/cover closed and locked
before the unit is started in order to avoid the risk of personal injury from rotating parts.
CAUTION
The unit must be run constantly and only be stopped for maintenance.
CAUTION
The safety switch must not be used for normal starting and stopping of the unit.
Use the wireless IQC Display provided.
CAUTION
In the event of interruption in power, the settings will be stored. Date and Time are saved for
24 hours. After that, Date and Time must be reset. Make sure the unit is started up.
The airflow is regulated in the mode using the wireless display. Normal mode is the preset base mode.
Accessible modes:
Away Reduced air flow, can be used when no one is home.
Normal Adjusted at installation, must not be changed.
Boost A higher airflow than normal, medium/max can be selected. This alternative should be
used when there is need for a higher airflow, for example when cooking food, drying
laundry or taking a sauna.
Overpressure Pressure compensation in the event of supplementary heating, for example,
when using an open cooker or stove.
Night cooling Temperature regulated boost without heat recovery. Cooling with cold outdoor air
if needed.
Certain settings are protected by a code so they cannot be changed unintentionally.
NOTE! If a mode is activated manually, the programmed or previous settings are overwritten.

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4.1 Entering the basic settings for IQC Display
1. Open the main menu, select Settings.
2. Select General.
3. Select Language from the list.
4. Enter Time.
5. Select Measurement system from the list.
6. Select Time format from the list.
7. Select Time zone from the list.
4.2 Pairing units
The wireless IQC Display is paired upon delivery. If an extra display is desired, this must be paired with a slave
dis- play with Display ID 2. The first wireless display is the main display with Display ID 1.
If the pairing is reset, the main display must be paired again.
1. Open the main menu, select Service.
2. Log in. Enter code 1199.
3. Select Unit pairing.
4. Add the new wireless display.
• To continue to the main display again after pairing, enter Display ID 1.
• To continue to a slave display, enter Display ID 2.
The wireless display will now be restarted.
5. Open the main menu, select Service.
6. Log in. Enter code 1199.
7. Select Unit pairing.
8. Activate the icon. The wireless display is in search mode for 40 seconds.
9. Making the unit visible for pairing. Turn off and turn on the power, or press the reset button
on the control panel. The IQC Display is now visible for pairing for 10 seconds.
10. If the IQC Display cannot be found, the following is displayed Pairing units failed.
No unit found in a window. The wireless display returns to the menu Unit pairing.
Repeat steps 4 - 9.
11. If the unit is found, the following is displayed Unit found. Pairing key: (unique number).
Press OK to confirm.
The wireless display now starts to synchronise data from the unit.

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EN | Operation
4.3 The display mode — Home screen simple and advanced
There are two home screens, Home screen simple and Home screen advanced.
4.3.1 Home screen simple
The following symbols can be displayed in the status bar:
1 Main menu
2 Date and time
3 Information about the active view
4 Status cloud connection
5 Air quality compensation for high level of a sensor
6 Radio or cable connected communication
7 Battery level
8 Night cooling active
9 Heater/Cooler active
10 Away mode
11 Active program, program no. 5
12 Alarm active
13 Status row – shows available functions
14 Hotkeys to activate or deactivate functions for the modes Boost,
Overpressure and Away mode
1 3 5 7 9 11
2 4 6 8 10 12
Thu 01 Jan Larm (10) 13
14
Temp. Boost Overpressure Away

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4.3.2 Home screen advanced
Home screen advanced shows the same status and hotkeys as Home screen simple.
Home screen advanced shows more information on hotkey status, not just on/off.
An extra page of informa- tion on operation of the HERU units is also available..
4.3.3 Select preset home screen
The preset choice is Home screen simple.
To select Home screen advanced, perform the following steps:
1. Open the main menu, select Settings.
2. Select General.
3. Scroll right down the menu and activate the icon for Home screen advanced.
Return to the main menu. Press on the main menu button in the upper left corner.
Return to the home screen. Press button Xin the upper left corner.
4.4 Use the main menu
No preparations are required.
1. Open the main menu. Press on the main menu button in the upper left corner.
Scroll through the menus using your finger.
2. Close the main menu to return to the home screen. Press button Xin the upper left corner.
4.5 Temperature regulation
No preparations are required.
1. Press on the icon for temperature.
2. Set desired temperature. Use the buttons -and +.
NOTE!
If the economy temperature is activated (Activate eco. reference value is on),
you can set both comfort temperature and economy temperature.
3. Return to the home screen. Press on the arrow in the bottom left corner
or on the main menu button in the upper left corner.
Thu 01 Jan Thu 01 Jan
iiTemp. Boost Overpressure Away Fans Sensors Rotor Filter
0˚ 0% 0 D.
Outdoor Supply Filter change
0˚ 0%
Extract Exhaust
0˚
Room

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EN | Operation
4.6 Boost
4.6.1 Boosting the unit
No preparations are required.
1. Press on the icon Boost. Operation in boost mode is shown with a green circle around
the icon. Deactivate by clicking on the icon again.
NOTE! The preset time for boost operation is 30 minutes.
4.6.2 Change operating time for boost
No preparations are required.
1. Open the main menu, select Service.
2. Log in. Enter code 1199.
3. Select Setup.
4. Scroll down to Boost and change the operating time.
5. Return to the main menu. Press on the main menu button in the upper left corner.
6. Return to the home screen. Press button Xin the upper left corner.
4.7 Overpressure
4.7.1 Activate overpressure
No preparations are required.
1. Press on the icon Overpressure. Operation in overpressure mode is stated with a green circle
around the icon. Deactivate by clicking on the icon again.
NOTE! The preset time for overpressure operation is 15 minutes.
4.7.2 Change operating time and compensation for overpressure function
No preparations are required.
1. Open the main menu, select Service.
2. Log in. Enter code 1199.
3. Select Setup.
4. Scroll down to Overpressure and change the operating time.
5. State desired Offset value.
Offset is the difference between supply and exhaust air. Increased to the supply air fan first.
If the supply air fan reaches the limit for maximum fan speed, the exhaust air fan is reduced
until the difference between the fans corresponds to the offset value.
6. Return to the main menu. Press on the main menu button in the upper left corner.
7. Return to the home screen. Press button Xin the upper left corner.

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4.8 Activate Away mode
No preparations are required.
1. Press on the icon Away. Operation in away mode is stated with a green circle around the icon.
The away mode is active until it is manually deactivated by pressing on the icon again.
NOTE!
The away mode is prioritised and overrides the program planner if both are active simultaneously.
4.9 Activate screen lock
No preparations are required.
This can be locked in order to avoid involuntary changes to the screen.
1. Open the main menu, select Lock screen. The screen locks and a padlock is displayed.
2. To unlock the screen, press on the screen and hold for three seconds.
4.10 Scheduling
There are two types of schedules: Scheduler for programming the intervals for weekdays and Holiday
scheduler for programming per date. Holiday scheduler overrides Scheduler for weekdays. If the
different schedules coincide with each other, the schedule with the lowest number overrides the other.
The Scheduler can be used in both comfort and economy mode, if the economy temperature is activated.
No preparations are required.
1. Open the main menu, select Scheduler.
2. Select type of schedule.
The upper icon automatically activates when one or more program is activated.
When you deactivate this icon, all programs are deactivated.
3. Select Program 1 by clicking on it.
4. Enter the selected value.
5. Select Fan speed. Select Min,Std,Max or Energy saving mode from the dropdown list.
6. If economy temperature is activated, select Temp.mode. Select Comfort or Economy from
the dropdown list.
7. Click on the button Save. The program has activated. In order to deactivate a program,
deactivate the icon to its right.
8. To set several different programs, repeat steps 1 – 7 as required.
9. Return to the main menu. Press on the main menu button in the upper left corner.
10. Return to the home screen. Press button Xin the upper left corner.

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EN | Operation
4.11 Activate night cooling
Night cooling is a temperature regulated boost without heat recovery, where the unit is cooled with cold
outdoor air as needed.
Night cooling is activated when the exhaust air temperature is higher than Exhaust air high and
outdoor temperature is colder than In/Out diff.
Night cooling is deactivated when the exhaust air temperature is lower than Exhaust air low or
the outdoor temperature is warmer than In/Out diff.
Temp.evaluation Rest mode must be activated if the unit is in standby mode or night cooling is
requested. Temp.evaluation Rest mode checks whether the criteria for activating night cooling has
been fulfilled within the set time intervals.
No preparations are required.
1. Open the main menu, select Service.
2. Log in. Enter code 1199.
3. Press OK.
4. Select Setup.
5. Scroll down to Night cooling. Press the Activate icon.
6. Enter the selected value.
7. If the unit is in standby and night cooling has been requested, activate Temp.evaluation
Rest mode.
8. Enter the selected value.
9. Return to the main menu. Press on the main menu button in the upper left corner.
10. Return to the home screen. Press button Xin the upper left corner.
4.12 Turn the unit off and on
No preparations are required.
1. Starting the unit. Connect plug/turn on the safety switch.
Press on the display and click on OK to the question Start unit?.
2. Turning off the unit. Open the main menu, scroll down and select Turn offthe unit.
4.13 Use the Alarm menu
No preparations are required.
1. Open the main menu, select Alarm.
2. Select Active alarms to see all active alarms.
3. After managing an active alarm, the active message for the alarm is cleared.
• Click on the alarm to reset it. In the dialogue box displayed, select Reset.
• In order to reset all active alarms, click on Reset all in the upper right corner
in Active alarms.
4. Select Alarm history to see all previous alarms.
5. Return to the main menu. Press on the main menu button in the upper left corner.
6. Return to the home screen. Press button Xin the upper left corner.

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4.14 Change settings
For all available options, see 7 Menu structure in the wireless IQC Display.
No preparations are required.
1. Open the main menu, select the desired alternative to be changed.
2. Change the parameters to the desired value.
3. Return to the main menu. Click on the main menu button in the upper left corner.
4. Return to the home screen. Press button Xin the upper left corner.
4.15 Update firmware in the ventilation unit
Preparations:
Download the latest firmware version from www.ostberg.com and save the file in an appropriate place on
the computer’s hard disk.
No other preparations are required.
1. Ensure that the unit is powered. The unit does not need to be turned on.
2. Connect the display unit to the computer with a Micro USB type USB cable intended for data
transfer. The cable provided is only intended for charging, not data.
3. Open the display unit that appears as a storage unit in the file manager.
Alternatively, you first need to select which measure will be performed when the display unit
has been found.
Select the alternative that opens the unit in the file manager.
4. Copy the file from the computer’s hard disk. The file that will be used for updating has
the ending .m3f.
5. Paste the file on the display’s storage device in the explorer. The display unit starts the update
immediately. The display unit is updated first. The progress is shown in the display (0-100%).
A brief verification (0-100%) is then performed before the display unit restarts.
6. Once the display unit has restarted, disconnect the display unit from the computer.
7. If two displays are used, then repeat steps 2-6 for the second display (ID number 2).
If two displays are used and are paired to the unit, the mainboard is only updated from
the display unit that is master (ID number 1).
8. Ensure that the display has contact with the unit via the docking station or wireless connection.
The display unit then synchronizes with the unit and verifies the existing software version in
the mainboard. If the control card in the unit has a lower version than the updated display,
the display will also start updating the mainboard. The progress for “Mainboard update”
is shown in the display. The unit then starts up for normal operation.
9. Check that the downloaded version has been correctly installed on both the display unit and
mainboard by going to Settings/about.

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EN | Operation
4.16 Installing HERU IQ App
The free HERU IQ App allows the user to control the unit’s basic functions.
It is possible to change the temperature and also activate/deactivate Boost, Overpressure and Away modes.
Preparations:
Make any settings in the home network to guarantee the HERU unit’s continuous connection to
the internet / Cloud.
No other preparations are required.
1. Connect the unit to the internet-based Cloud service by fitting the internet connection with
internet connection via the LAN port on the unit’s mainboard.
2. Download the HERU IQ app to your smartphone from your app store.
3. Create an HERU IQ account and log into the app.
4. Follow the instructions in the HERU IQ app to pair the unit and smartphone.
Once pairing is finished, the unit is ready to be controlled via the HERU IQ App.