INSTALLATION, OPERATION, MAINTENANCE AND SPARE PARTS
HEAT RECOVERY UNIT
HouseMASTER RDAS
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CONTENTS
NOTE! INSTALLATION, ADJUSTMENT AND COMMISSIONING AS DESCRIBED IN THESE INSTRUCTIONS MUST BE
CARRIED OUT BY AN INSTALLER OR SERVICE PERSONNEL.
WARNING! THE APPLIANCE MAY BE USED BY CHILDREN OVER THE AGE OF 8, PERSONS (INCLUDING CHILDREN) WITH
PHYSICAL, SENSORY OR MENTAL DISABILITIES OR LACK OF KNOWLEDGE OR EXPERIENCE, PROVIDED THEY HAVE
RECEIVED INSTRUCTION OR INFORMATION ON SAFE USE OF THE APPLIANCE AND UNDERSTAND THE POTENTIAL RISKS.
CHILDREN MAY NOT PLAY WITH THE APPLIANCE. CHILDREN MAY NOT CLEAN OR PERFORM MAINTENANCE ON THE
APPLIANCE WITHOUT SUPERVISION.
OPERATION AND MAINTENANCE (FOR USER)
Functions, electrical data, energy class ................................................................................ 3
ISYteq Touch 3.5 control panel
General information ................................................................................................................ 4
Cleaning of the display ......................................................................................................... 4
General buttons and symbols ............................................................................................ 4
Home screen ............................................................................................................................5
Operation ....................................................................................................................................6
Maintenance and cleaning of heat exchanger and fans ................................................8
Filter alarm, filter replacement ..................................................................................................9
Overheating protection, temperature alarm, rotor alarm, other alarms ................. 10
INSTALLATION (FOR INSTALLER AND SERVICE PERSONNEL)
Dimensions and weight ............................................................................................................... 11
Wiring and connection diagram.............................................................................................. 12
Duct connection, duct insulation .............................................................................................13
Installation options and duct definitions .............................................................................. 14
Installation, connection ISYteq Touch 3.5 control panel ................................................17
ADJUSTMENT, COMMISSIONING (FOR INSTALLER AND SERVICE PERSONNEL)
Settings, date/time, language ..................................................................................................18
Settings, login ..................................................................................................................................19
Adjustment ...................................................................................................................................... 20
Control panel operation, commissioning .............................................................................21
Parameter list ..................................................................................................................................24
MISCELLANEOUS
Spare parts ..................................................................................................................................... 29
EC Declaration of Conformity ................................................................................................... 30
Disposal of products and packaging materials ................................................................31
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ENERGY CLASS
Compliant with energy class A+ in cold climate conditions (Scandinavia).
If configured for on-demand control, the unit is compliant with energy
class B in average climate conditions (Central Europe). Ecodesign
Directive 1254/2014.
OPERATION AND MAINTENANCE (FOR USER) - FUNCTIONS, ELECTRICAL DATA, ENERGY CLASS
ELECTRICAL DATA
Voltage: 230 V, single phase 50 Hz
Code Fan motors
Output, W
Preheater
Electrical, W
Postheater
Electrical, W
Rated output1)
W
RDAS 2 x 170 1000 1000 2360
1) Rated output applies when both preheating and postheating devices are installed.
FANS
The fans are powered by energy-efficient EC motors. They are easy to
remove for service and maintenance. The speed of the fans can be
adjusted independently of each other.
HEAT RECOVERY AND SUPPLEMENTARY HEATING
In climates where the temperature seldom drops below –10 °C, there
is usually no need for supplementary heating. This is because the
rotary heat exchanger recovers enough thermal energy from the
extract air (≤ 85% h
temp
).
When the outdoor temperature is below -10 °C and the desired supply
air temperature cannot be achieved, a postheater is required, which is
controlled to maintain the set supply air temperature.
In very cold areas, the unit can also be supplemented with a heat-
er that preheats the outdoor air. This heater starts preheating the air
when the outdoor temperature falls below -12 °C.
The electric heater has an integrated overheating protection function.
NOTE! THE ELECTRIC POSTHEATER IS ONLY ACTIVATED IF THE
ROTOR IS IN OPERATION.
FILTER
The unit is fitted with class ISO Coarse 85% (M5) filters for the supply
air and class ISO Coarse 80% (G4) filters for the extract air. For filter
replacement, see page 7.
ISYTEQ MINI CONTROL UNIT
A ISYteq Mini control unit is integrated into the unit and controls the
operation of the fans, the rotary heat exchanger and any electric heat-
ers. The unit is controlled via an external ISYteq Touch 3.5 control pan-
el (accessory), which should be installed in a suitable place.
DEFROSTING
During cold periods, when frost may form in the rotor, the integrated
control unit automatically activates a defrosting function. The unit de-
frosts for 15 minutes every 6 hours if the outdoor temperature is below
-10 °C. The supply air fan stops and the rotor moves forward in sec-
tions.
COOLING RECOVERY
In the summer, if the extract air is cooler than the outdoor air, the rota-
ry heat exchanger starts to recover cooling from the cooler extract air.
This primarily applies if there is some type of cooling appliance in the
house.
ALARMS
If the ISYteq Touch 3.5 control panel (accessory) is used, the alarm will
be presented in plain text.
MOISTURE CONTROL (OPTIONAL)
This function automatically limits the rotary heat exchanger’s moisture
recovery at high indoor humidity levels.
This function can also be ordered retrospectively to supplement the unit.
CO2 CONTROL (OPTIONAL)
This function regulates towards a preset setpoint. The fan speed is au-
tomatically adjusted to achieve the desired CO
2
level.
NOTE! CO
2
control requires a ISYteq Touch 3.5 control panel. This func-
tion can also be ordered retrospectively to supplement the unit.
ETHERNET CONNECTION (OPTIONAL)
This function can be used to connect the unit to an existing network. The
RDAS has an integrated web server, which makes it possible to read
and change certain parameters via a web browser. The connection can
also be used for connection to a superior system via Modbus TCP/IP..
To optimize the performance of communication, please follow the
recommendations below.
- Minimize the number of general broadcasts.
- Only send dedicated traffic to the controller.
- Do not attempt to access the web server when using Modbus TCP-IP.
- Maximum of one Modbus message per second is recommended.
Avoid data bursts.
- Only write to Modbus registers when values have been changed.
THE UNIT’S MAIN COMPONENTS
1. Outdoor air sensor
2. Extract air sensor
3. Supply air sensor
4. Preheater
5. Extract air fan
6. Heat exchanger
7. Supply air filter
8. Control unit
9. Casing
10. Heat exchanger motor
11. Extract air filter
12. Postheater
13. Supply air fan
1
7
12
10
13
11
3
9
2
6
8
5
4
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ISYTEQ TOUCH 3.5 CONTROL PANEL
GENERAL
The control panel has a touch screen display. Use your finger or the
back of a pen to navigate in the menus.
When the power is switched on, all the menus will be imported into
the system. This will take about 20-30 seconds. After this, the home
screen will be displayed.
CLEANING OF THE DISPLAY
Disconnect the unit from the power supply by disconnecting the power
cord. Carefully wipe the display with a soft, dry, non-abrasive cloth.
If any marks remain, moisten the cloth slightly with a detergent spe-
cially designed for LCD or mobile screens and wipe the screen gently
from top to bottom.
Never use other detergents, as they may contain ammonia or other
additives that could damage the display.
IMPORTANT:
• Never spray or pour liquids directly onto the display.
• Never clean the control panel when the system is switched on.
GENERAL BUTTONS AND SYMBOLS
The following buttons and symbols are universal and available on
many menu pages.
Home button, to return to the home screen.
Back button, to cancel and return to the previous page.
Confirm button, to confirm and proceed.
Changing a value.
Option 1: Press the arrow keys to increase or decrease
the value.
Option 2: Press the displayed number to enter the cho-
sen value (see below).
Use the number keys to enter a value.
Confirm with or cancel with .
Read-only values (without a surrounding
window), cannot be changed.
Editable values (surrounded by a win-
dow), can be changed.
Some submenus have more than one
page. Click the upper or lower part
of the scroll list to navigate between
pages.
NOTE! The cursor cannot be moved
vertically.
14
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ISYTEQ TOUCH 3.5 CONTROL PANEL - HOME SCREEN
ALARMS
No alarm
Alarm B
Alarm A
Heat recovery active
Postheater active
Preheater active
Defrosting in progress
Manual mode
Heating stove mode
CO2 control
Forced via cooker hood
Away mode
Home mode
Forced mode
STATUS LINE
OPERATING STATUS
OPERATING MODES
CLOCK
CURRENT SETPOINT,
SUPPLY AIR TEMPERATURE
The user can select between the following operating modes:
“AWAY” used when there is reduced need for ventilation, e.g.
when occupants are on holiday
“HOME” used for normal ventilation flow
“FORCED” used when there is a greater need for ventilation
(automatically reverts to normal after 120 minutes)
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ALARMS
See page 7.
SHORTCUT TO SETTING OF TEMPERATURE SETPOINT
See page7 for more information on temperatures.
MENU
See page7.
SHORTCUT TO SETTING OF
DATE AND TIME
SELECT OPERATING STATUS
See page 7.
AWAY MODE HOME MODE FORCED MODE
Press the relevant field to select operating mode.
The operating mode cannot be changed during defrosting,
or during forced operation with a cooker hood.
ISYTEQ TOUCH 3.5 CONTROL PANEL - OPERATION
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SELECTING OPERATING STATUS
The symbol on the home screen shows the operating status. Press the
centre of the fan symbol to change the status.
Normal mode (manual)
Heating stove mode, makes it easier to light a heating stove
or open fireplace. Temporarily creates overpressure in the
house.
ALARMS
The symbol on the home screen shows the alarm status.
No alarm
Alarm B
Alarm A
Press the icon to enter the alarm screen.
MENU
TEMPERATURES
Here you set the desired supply air temperature (setpoint).
Note: This value is not to be confused with the desired in-
door temperature, which is managed by the domestic heat-
ing system. The recommended setpoint is 16–19 °C. The
factory setting is 18 °C. Temperatures, output signals etc.
are read-only values.
FAN STATUS
Supply and extract air fan speeds can be read from
30 –100 % or as 0 (off).
AIR QUALITY
Air quality (only available if optional moisture control or CO
2
control is activated). Relative humidity of the supply and ex-
tract air can be read from 0-100% RH.
The setpoint and current CO
2
value (up to 2,000 ppm) can
be read.
SYSTEM OVERVIEW
Version control panel -- -- -- -- -- -- -- -- -- -- -- --IP Octet 1
Bootloader control panel --------------------IP Octet 2
Version control card ------------------------ IP Octet 3
Bootloader control card -- -- -- -- -- -- -- -- -- -- --IP Octet 4
Unit type
TIME SCHEDULES
(Not applicable to domestic ventilation).
SETTINGS
See pages 18–19.
Example 1 No alarm Example 2. Active alarms
ALARM HISTORY
ISYTEQ TOUCH 3.5 CONTROL PANEL - OPERATION
CLEARING ALARMS
To clear an individual alarm, press Acknowledge after the relevant
alarm. To clear all the alarms, press Acknowledge All button (top right).
If the alarm cannot be cleared, it will reappear on the display and the
underlying cause for this must be resolved before the alarm can be
cleared.
A built-in timer is normally set to provide a filter replacement reminder
(alarm) every six months. If a shorter replacement interval is required
(before the alarm is due) the filter alarm can be reset under the Set-
tings menu. See page 9, fig. 13.
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MAINTENANCE AND CLEANING OF HEAT EXCHANGER AND FANS
GENERAL
The fans, filters and heat exchanger are very important for the opera-
tion and economy of the unit. For this reason, it is crucial for them to
be kept clean and in good condition.
We recommend a general check-up every 6 months. For safety rea-
sons, general caution should be observed during maintenance of the
unit. Be careful to avoid trapping any cables. If necessary, use protec-
tive gloves.
CLEANING OF THE HEAT EXCHANGER
Check that the surface of the rotor is not coated with dust. Clean with
a vacuum cleaner or by blowing through with compressed air. If vac-
uum cleaning is not sufficient, hand-spray with grease dissolving fluid
and then blow clean with compressed air. Use the compressed air to
blow away from the clean side towards the dusty side. NOTE! Water,
acetone or similar solvents must not be used. We recommend that the
rotor be lifted out by two people.
Figure 5. Before cleaning the heat exchanger, fans etc., the unit should always have
the power disconnected. CLEANING OF FANS
Note that the fans must not be cleaned with water or other fluids; they
may only be vacuum cleaned or brushed.
Figure 6. Remove the screws on the door and open the door.
Figure 7. Remove the heat exchanger from the unit. Disconnect the electrical
connection to the rotor motor.
Figure 8. Vacuum clean the heat exchanger from both sides or blow clean with
compressed air.
Figure 9. Remove the fan from the unit. Disconnect the electrical connection.
Figure 10. Disconnect the rotor from the fan housing by unscrewing the screws on
the side of the fan housing.
Figure 11. Clean the rotor housing and the fan blades with a brush or a vacuum
cleaner.
ADJ
Mode
LED
Param.
D6
D7
D8
D9
OFFON
The drive belt and seals may need replacing due to wear and tear.
Check them for damage and replace if necessary. For designations,
see spare parts list on page 29.
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ADJ
Mode
LED
Param.
D6
D7
D8
D9
OFFON
Figure 15. Opening of the door.
Figure 16. Location of filters in unit.
B
A
3. Pull out the supply air and exhaust air filters (see figure 16). Dispose
of used filters according to local waste regulations.
4. Insert new filters.
2. Open the door of the unit by unscrewing the two screws on the front
(see figure 15).
5. Reinstall the filter hatch.
6. Connect the plug.
7. After replacing the filter, reset the filter timer by pressing the
* button on the control panel for a minimum of 10 seconds.
If there is no ISYteq Touch 3.5 control panel (accessory) on the unit
when the filter is replaced, the timer must be reset when the alarm is
due, i.e. when the set time is reached.
FILTER ALARM AND FILTER REPLACEMENT
Figure 14. Pull out the plug.
Figure 12. The information symbol indicates alarm B.
Figure 13. Showing and resetting of filter alarm.
FILTER ALARM AND FILTER REPLACEMENT
The supply air and exhaust air filters should normally be replaced
every six months. In dirty areas, the filters may need to be replaced
more frequently.
A built-in timer is normally set to provide a filter replacement reminder
every six months. When replacing dirty filters, use of a face mask is
recommended (lowest class, FFP2).
To replace the filter, follow the steps below.
1. Disconnect the unit from the power supply.
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OVERHEATING PROTECTION, TEMPERATURE ALARM, ROTOR ALARM, OTHER ALARMS
THERMAL OVERLOAD PROTECTION
The fan motors are equipped with thermal overload protection
devices, which are reset manually by briefly disconnecting the
power.
The electric heaters have two thermal overload protection devic-
es, one automatic and one manual. The automatic overheating
protection trips before the manual one, which means it does not
normally need to be reset.
If the manual overheating protection for the electric heater has
tripped during operation, first the power to the unit should be
switched off and then the overheating protection should be reset
by pressing the reset button.
If the manual overheating protection trips again, call qualified
service personnel.
TEMPERATURE ALARM
Generates an alarm and stops operation if the supply air temperature
drops below +5 °C. The alarm is disabled during defrosting. A 10-min-
ute delay ensures that the supply air temperature has time to rise if
operation has been stopped.
ROTOR ALARM
If the rotor motor stops and the Tacho signal disappears, five attempts
will be made to restart the rotor (Start / Stop). If this does not solve the
problem, the unit will stop and the rotor alarm will be indicated.
OTHER ALARMS
The unit has various other alarms, which are shown in plain text in the
ISYteq Touch 3.5 control panel. If the alarm recurs after being cleared,
call service personnel for assistance.
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INSTALLATION (FOR INSTALLER AND SERVICE PERSONNEL)
45 50
20+30+30 (Ø8)
13
13
950
424
506
498
580
550
123
143
143
123
363 378
385
437
Connection (female) T F U A
Diameter 200 160 200 160
Connection Supply air Extract air1) Outdoor air Exhaust air1)
1) To be increased to Ø200 as soon as space allows.
T
A
UF
DIMENSIONS AND WEIGHT
Weight: 68 kg
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WIRING AND CONNECTION DIAGRAM
CONTROL CARD
Supply
board
230 V
Door switch
L N PE
Collective fault alarm
Max 24V,
200 mA
Timer 1 Timer 2
Rotor
Extract air fan
External alarm
(potential free contact)
Supply air fan
ISYteq Basic
ISYteq Touch
USB
N
MDI MDI
L
C
NO
Post heater
N
L
N
L
Tacho
1 N
2 L
3 N
4 L
5 N
27
70 69 68 67 66 65 64
28 3732 33 34 3835 3613 14 15 16
51
50
49
48
47
46
6 L
7 N
8 L
11 N
12 L
0 V
+10 V
A
A
B
B
Ethernet card
RS485
B A
GND
Output 0-10V
+24 V
GND
N
L
0 V
+10 V
Spiskåpa
N
L
CO2 sensor
Temperature
extract air
Temperature
outdoor air
Temperature
supply air
Moisture sensor
extract air
Moisture sensor
supply air
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DUCT CONNECTION
Exhaust air from the unit may only be connected to a ventilation duct
intended for this purpose. Connection must not be made to a smoke or
gas flue. In case of extract air ventilation in premises where a smoke
or gas flue is used (for instance, an open fireplace or heating stove),
an adequate supply air flow must be ensured A kitchen flue must be
installed in accordance with applicable regulations.
DUCT CONNECTION, DUCT INSULATION
Note! During installation, the instructions regarding unit installation and duct insulation must be adhered
to without deviation. Otherwise, there is a risk of condensation and moisture resulting in major damage.
All figures in this table are recommended values which apply in central Sweden. Please check for local variations.
DUCTS IN WARM SPACES (INDOORS)
The temperature of the air
in the duct is above +10 °C The temperature of the air
in the duct is below +10 °C
No insulation
Supply air ducts (T)
Extract air ducts (F)
Outdoor air duct (U)
Exhaust air duct (A)
Supply air duct (T)
Extract air duct (F)
Fire protection
mesh mat 30 mm
with moisture-proof surface
DUCTS IN COLD SPACES
Supply air duct (T) Outdoor air duct (U)
Extract air duct (F) Exhaust air duct (A)
DUCTS IN LOOSE WOOL
RECOMMENDED INSULATION AND VAPOUR BARRIERS FOR DIFFERENT TYPES OF DUCTING
Ducting type Approved material and
location
Duct in a warm space
Insulation
Vapour
barrier Duct in a cold space Insulation Vapour barrier
Exhaust air (flue)
In kitchen Sheet metal, accessible for
inspection Armaflex AF3, 19 mm Yes – –
Between joists and in attic Sheet metal Fire protection E15, Yes Fire protection E15, Only inside
mesh mat 30 mm mesh mat 50 mm building's vapour barrier
Exhaust air (no flue) Sheet metal Mineral wool 25 mm Yes – –
Between joists and in attic Sheet metal Mineral wool 30 mm Yes Mineral wool 30 mm Yes
From tumble dryer Sheet metal Mineral wool 30 mm No Mineral wool 100 mm No
Outdoor air
In kitchen Sheet metal, accessible for
inspection Armaflex AF3, 19 mm Yes – –
Between joists and in attic Sheet metal Mineral wool 60 mm Yes Inside building’s vapour barrier Only inside
Mineral wool 60 mm building's vapour barrier
Supply air Sheet metal No requirements Mineral wool at least 80 mm No
Extract air or equivalent.
Roof truss
Moisture barrier
Moisture barrier
Moisture barrier
Moisture barrier
The sheet must be bound
tightly to the duct.
Min thickness 10 cm.
Roof truss
Moisture barrier
Moisture barrier
Moisture barrier
Moisture barrier
The sheet must be bound
tightly to the duct.
Min thickness 10 cm.
Min thickness 10 cm.
Moisture barrier
Roof truss
Roof truss
Moisture barrier
Moisture barrier
Moisture barrier
Moisture barrier
The sheet must be bound
tightly to the duct.
Min thickness 10 cm.
Min thickness 10 cm.
Moisture barrier
Roof truss
DUCT INSULATION
In order for the installation of the unit to be effective, it is crucial that
the installation of the ventilation ducts in the unit, as well as the instal-
lation of ducts through external walls containing insulation and vapour
barriers, roofs and joists, is executed in a professional manner. Other-
wise there is a risk of condensation, resulting in moisture damage.
If older units are replaced, it is also necessary to inspect ducts and
duct insulation for damage and ensure they are of adequate quality.
Supply air ducts (T) and extract air ducts (F), i.e. ducts containing
warm air, which are located in unheated spaces, must be insulated.
The insulation should be installed externally and have a wind-proof
surface.
Outdoor air ducts (U) and exhaust air ducts (A), i.e. ducts filled with
cold air, which are located inside the building’s vapour barrier, must be
insulated and have a diffusion-proof (moisture-proof) surface. Given the
high degree of heat recovery achieved by the unit, the exhaust air also
gets very cold and must be thermally insulated. Moreover, ducts which
run alongside each other must have a common vapour barrier.
For designations of the various ducts, see “Duct definitions” on the
next page.
The wall on which the unit is to be installed must be well insulated.
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INSTALLATION OPTIONS AND DUCT DEFINITIONS
To prevent accidents and injury: The unit must
be connected to ducting and the door must be
closed before the power is switched on.
!
The unit must be connected to an earthed power
outlet.
!
2
25
50
X mm
A x 2
X
1
A
950
max 200
INTRODUCTION
If the unit is not installed immediately after delivery, it should be stored
well-protected under a roof in its original packaging. We recommend
that the unit always be lifted by two people. Protective gloves should
be worn.
INSTALLATION OPTIONS
The unit should be positioned as shown in the ventilation
drawing. If no ventilation drawing is available, installation should be
done according to one of the installation options below. The unit is in-
tended for installation indoors in a warm or cold space.
Ducts A and F should be increased to Ø200 mm
as soon as space allows after the unit.
T = Supply air
F = Extract air
U = Outdoor air
A = Exhaust air
K = Extract air device in kitchen (not above cooker)
DUCT DEFINITIONS
Figure 17. Duct definitions.
T
K
U
F
A
INSTALLATION OPTION 1
Option 1 applies to a vertical unit with air connections at the top.
Install the unit as shown in steps 1-6.
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43
550
INSTALLATION OPTIONS
6
5
Plaster
Mineral Wool
1
2
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INSTALLATION OPTIONS
INSTALLATION OPTION 2
Option 2 applies to a horizontal unit with air connections on the side.
Mineral wool,
thickness 50 mm Stable surface
Exhaust air
Extract air
Outdoor air
Supply air
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ISYTEQ MINI TOUCH CONTROL PANEL RDKZ-41-3 - INSTALLATION AND CONNECTION
1. Open the control panel using a screwdriver.
2. Lift the display out of the enclosure.
3. Push the connection cable through a suitable hole and if needed
make an outlet for the cable on side of the cover.
4. Mount the enclosure directly on the wall or using the screws in a
junction box.
5. Connect the cable to the back of the display as shown above. NOTE!
Do not touch the electronics.
Push the display back into the enclosure.
6. Check that the control cable is correctly connected to the control
card before switching on the power supply.
USB
51
50
49
48
47
46
1 N
2 L
3 N
4 L
5 N
27
70 69 6867 66 65 64
28 3732 33 34 3835 3613 14 15 16
6 L
7 N
8 L
11 N
12 L
A
B
Ethernet card
(accessory)
ISYteq Touch 3.5
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ADJUSTMENT, COMMISSIONING (FOR INSTALLER AND SERVICE PERSONNEL)
SETTINGS
To enter the “Settings” menu:
1. Press the gear cog button.
2. Press the spanner button.
3. In this menu you can set the date, time and language. There is also
the option of resetting the filter alarm in advance. Installers and ser-
vice personnel can log in and access additional parameters.
DATE / TIME
2. Set the time. Press “Confirm”.
1. Set the date and continue by pressing “Confirm”.
1. Press the appropriate language flag. Press “Confirm”.
SELECT LANGUAGE
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LOGIN, INSTALLER AND SERVICE PERSONNEL
LOGIN
Installers and service personnel must log in to access “Settings”.
The default (preset) password is 0000. This password can be
changed.
1. Enter the correct password. Press “Confirm”. Use, for instance, the
back of a pencil for greater precision.
SETTINGS FOR INSTALLER AND SERVICE PERSONNEL
For adjustment of fans, see page 19.
For other settings, see parameter list on page 24.
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ADJUSTMENT, COMMISSIONING
AIRFLOW CALCULATION
The unit is equipped with four measurement points as per figure 16
above. Measuring the pressure difference, Dp
m
in Pa over the rotor
gives the total supply air and extract air flows. The air flow q in l/s is
determined using the following formula:
q = 1.3 x Dpm
where Dp
m
= measured pressure in point T – measured pressure in
point U
or:
where Dp
m
= measured pressure in point F – measured pressure in
point A
PLANNING ADVICE
In a rotary heat exchanger it is not possible to completely eliminate
leakage between supply air and extract air. Air leakage at the seals is
minimised by keeping the pressure difference between the supply air
and extract air ducts as small as possible.
Also check the pressure balance between supply air and extract air.
Lower pressure on the supply air side can result in the transfer of
moisture and odour. This is especially important if Forced mode is
used.
The pressure at point T should be higher than at point F.
The pressure at point U should be higher than at point A.
FLOW ADJUSTMENT
The speed of the fans are adjusted independently of each other.
NOTE! Flow deviations of up to 25% may occur when this
measurement method is used on a unit with a rotary heat
exchanger. The measured flow values should only be re-
garded as indicative. Always perform control measurement
in the supply and extract air devices
.
INTRODUCTION
Adjustment of air flow and temperature may only be carried out by an
installation engineer or service personnel.
Wrongly adjusted air flows may result in increased
energy consumption and damage to the building.
F
A
UT
T = Supply air F = Extract air
U = Outdoor air A = Exhaust air
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