Vents VUT 350 EH User manual

VUT 350 EH
VUT 500 EH
VUT 530 EH
VUT 600 EH
VUT 800 EH
VUT 1000 EH
VUT 1500 EH
VUT 2000 EH
HEAT RECOVERY AIR HANDLING UNIT
USER`S MANUAL

2
Introduction
Use
Delivery set
Structural designation key
Technical data
Safety requirements
Structure and operating logic
Mounting and set-up
Condensate drain
Connection to power mains
Unit control
Maintenance
Fault handling
Storage and transportation rules
Manufacturer’s warranty
Acceptance certicate
Electrical connection certicate
Acceptance certicate
Seller’s information
Mounting certicate
Warranty card
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CONTENT

3
VUT EH
VUT EH
TECHNICAL DATA
INTRODUCTION
The present user manual consisting of technical details, operating instructions and technical specication covers the installation of
the VUT...EH air handling unit with heat recovery, VENTS series, hereinafter referred as the unit.
USE
The unit with a heat exchanger and an electric heater is a heat recovery device and is one of the energy saving components used in
buildings and premises. The unit is a component unit and is not designed for independent operation.
The unit enables continuous air exchange by means of mechanical ventilation in private residences, oces, hotels, cafes, conference
rooms, etc. as well as recovery of the waste heat energy contained in the extract air to warm up the clean supply air.
Transported air must not contain any ammable or explosive mixtures, evaporation of chemicals, coarse dust, soot and oil particles,
sticky substances, brous materials, pathogens or any other harmful substances.
THE UNIT IS NOT INTENDED TO BE USED BY CHILDREN, PHYSICALLY OR MENTALLY DISABLED PERSONS, PERSONS WITH
SENSORY DISORDER, PERSONS WITH NO APPROPRIATE QUALIFICATION.
ANY OPERATIONS WITH THE UNIT MUST BE PERFORMED ONLY BY PROPERLY QUALIFIED PERSONNEL AFTER THE
APPROPRIATE SAFETY BRIEFING.
THE UNIT INSTALLATION SITES MUST PREVENT ACCESS BY UNATTENDED CHILDREN.
Unit - 1 item;
Wall-mounted control panel - 1 item;
User’s manual - 1 item;
Packing box - 1 item.
DESIGNATION KEY
Spigot orientation:
H - horizontal
Heater type
E - electric
Air capacity [m3/h]
350, 500, 530, 600, 800,1000,1500, 2000
Unit type
VUT - heat recovery ventilation
VUT ХХХ EH
The unit is designed for indoor application with the ambient temperature ranging from +1 °C up to +40 °C and relative humidity up
to 80%.
The unit is classied as a class I electric appliance.
Hazardous parts access and water ingress protection standard:
Unit motors - IP 44;
Unit assembly connected to air ducts - IP 22.
For the main overall and connecting dimensions, outer view and technical data, refer to Fig. 1, 2 and in Tables 1, 2 and 3.
The unit design is regularly improved, so some models may slightly dier from those ones described in this manual.
DELIVERY SET

4
Fig. 1. VUT 350…600 EH overall and connecting dimensions
F
ØD
KI
H
G
C
E
B
A
Табл. 1Та
б
л. 1
Type Dimensions [mm]
AB C DE FGHI K
VUT 350 EH 996 403 954 124 1057 554 497 100 119 111
VUT 500 EH 996 403 954 149 1057 554 497 100 119 111
VUT 530 EH 996 403 954 159 1057 554 497 100 119 111
VUT 600 EH 996 403 954 199 1057 554 497 100 119 111
Table 1

5
VUT EH
VUT EH
Fig. 1. VUT 800…2000 EH overall and connecting dimensions
A
C
E
F
G
B
Ø D
H
I
K
M
L
Type Dimensions [mm]
ABCDE FGHI KLM
VUT 800 EH 1117 460 1071 249 1176 832 698 613 80 126 154 386
VUT 1000 EH 1117 460 1071 249 1176 832 698 613 80 126 154 386
VUT 1500 EH 1394 581 1345 314 1447 947 814 842 200 394 201 320
VUT 2000 EH 1394 581 1345 314 1447 947 814 842 200 394 201 320
Table 2

6
Table 3
Type VUT 350
EH VUT 500 EH VUT 530 EH VUT 600 EH VUT 800 EH VUT 1000 EH VUT 1500 EH VUT 2000 EH
Supply voltage, 50 Hz [V] 1~230 3~400
Max. fan power [W] 2 items х
130
2 items
х 150
2 items
х 150
2 items х
195
2 items
х 245
2 items х
410
2 items х
490
2 items
х 650
Max. fan current [A] 2 items х
0,60
2 items
х 0,66
2 items
х 0,66
2 items х
0,86
2 items
х 1,08
2 items х
1,8
2 items х
2,15
2 items
х 2,84
Electric heater power [kW] 3,0 3,0 4,0 4,0 9,0 9,0 18,0 18,0
Electric heater current [A] 13 13 17,4 17,4 13 13 26 26
Total unit power [kW] 3,26 3,3 4,3 4,39 9,49 9,8 18,98 19,30
Total unit current [A] 14,2 14,32 18,72 19,1 15,16 16,6 30,3 31,7
Max. air capacity, m3/h 350 500 530 600 800 1200 1750 2200
Rotation speed [min-1] 1150 1100 1100 1350 1650 1850 1100 1150
Noise level, 3 m [dB(A)] 24-45 28-47 28-47 32-48 48 60 49 65
Transported air temperature [°C] -25 up to
+55
-25 up
to +50
-25 up
to +50
-25 up
to +55
-25 up
to +45
-25 up to
+40
-25 up to
+45
-25 up
to +40
Casing material aluzinc
Insulation 25 mm mineral wool
Filter: extract G4
supply F7 G4 (F7)*
Connected air duct diameter [mm] Ø 125 Ø 150 Ø 160 Ø 200 Ø 250 Ø 315
Weight [kg] 45 49 49 54 85 96
Heat recovery eciency [%] up to 78 up to 88 up to 85 up to 78 up to 77
Heat exchanger type cross ow
Heat exchanger material aluminium
*option
SAFETY REQUIREMENTS
DO NOT!
• DO NOT OPERATE THE UNIT BEYOND THE SPECIFIED TEMPERATURE RANGE OR IN AN
AGGRESSIVE AND EXPLOSIVE MEDIUM!
• DO NOT CONNECT CLOTHES DRYERS OR SIMILAR EQUIPMENT TO THE VENTILATION SYSTEM!
• DO NOT OPERATE THE UNIT IN THE AIR AND DUST MIXTURE MEDIUM!
DISCONNECT THE UNIT FROM POWER SUPPLY PRIOR TO MOUNTING, MAINTENANCE,
CONNECTION AND REPAIR WORKS!
While operating and mounting the unit consider the requirements of the present operation manual as well as general requirements
of all applicable local and national building and electrical codes and standards.
The unit must be grounded!
Before connecting the unit to power mains make sure that the unit is free of any visible damages or any other foreign objects inside
the casing that can damage the impeller blades.
Mounting and connection of the unit to power mains only by duly qualied electricians with valid electric work permit!
The unit is not rated for operation in an environment that contains toxic or aggressive substances as acids, alkalis, organic solvents,
soot, paint as well as sputtered particles of explosive or aggressive substances. The unit is not rated for use in areas where atmospheric
conditions are determined by sea climate or hot springs.

7
VUT EH
VUT EH
DESIGN AND OPERATING LOGIC
Fig. 3. Operating logic
Intake air
Exhaust air
Extract air
Supply air
The unit has the following operating logic, Fig.3:
Warm stale extract air from the room ows through the air ducts to the unit, where it is ltered, then air ows through the heat
exchanger and is exhausted outside by the extract fan through the air ducts. Clean cold air from outside is moved by the supply fan to
the unit, where from it is directed to the supply lter. Then ltered air ows through the heat exchanger and moves to the room through
the air ducts.
Heat energy of warm extract air is transferred to clean intake fresh air from outside and warms it up. Heat recovery minimizes thermal
energy losses, energy demand and operating costs for supply air heating accordingly.
The unit is a framework construction that includes six rigidly xed 25 mm (for the VUT 350...600 EH units) and 50 mm (for the VUT
800...2000 EH units) thick sandwich panels. The three-layer sandwich panels are made of two galvanized steel sheets, internally lled with
thermal- and sound-insulated layer of mineral wool.
The air supply and exhaust units are equipped with quick-release access panels with special gaskets for easy repair and maintenance.
The terminal box (see Fig. 4: item 13 for VUT 350..600 EH) or the control unit (see Fig. 4: item 10 for VUT 800..2000 EH) contains the terminal
block. The power and ground cables are routed to the terminal block through sealed lead-ins.

8
The basic unit conguration includes:
a wall-mounted control panel with a cable connection to the control system;
supply and exhaust fans with forward-curved impeller blades, maintenance-free electric motors with external rotors and built-
in thermal protection;
cross-ow plate heat exchanger;
electric heater with overheating protection: two thermal switches, one of which is a safety switch (+60 °C) with automatic reset
on temperature dropping back to normal and the other is an emergency switch (+90 °C) with manual reset on pressing the
«RESET» button;
supply air lter (lter class (F7));
extract air lter (lter class G4).
Fig. 4. Unit design
4 3 12 5
9
131 107
811
2
6
17 3 2
11 6
58
10
4
12
1. Supply fan
2. Extract lter
3. Heat exchanger
4. Supply lter
5. Extract lter
6. Drain pipe
7. Electric heater
8. Bypass
9. Wall-mounted control panel
10. Control unit
11. Drain pan
12. Quick-detachable panels
13. Terminal box
9
VUT 350…600 EH
VUT 800…2000 EH

9
VUT EH
VUT EH
MOUNTING AND SET-UP
The unit is suspended to the mounting surface through the threaded rod xed inside the threaded dowel. The unit is also suitable also
for mounting to a horizontal mounting surface, Fig. 5.
While mounting the unit provide the minimum required access to the unit for maintenance and repair. The required minimum
distances from the unit to the wall is shown in Fig. 6.
Fig. 5. Unit mounting
washer
nut
vibration-absorbing
rubber
nut and lock-nut
Example
Mounting to horizontal
surface
Suspended mounting
Fig. 6. Minimum unit mounting distances
A = 600 mm (VUT 350-1000 EH)
А = 850 mm (VUT 1500-2000 EH)
A
500

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The unit must be connected to sewage collection system, g. 7. Connect the pipe, U-trap (not included in delivery package) and
sewage collection system with metal, plastic or rubber connecting pipes, g. 7. The pipe slope downwards must be at least 3°. Fill up
the system with water before connecting the unit to the power mains! The U-trap must be lled with water at all times during the unit
operation. Make sure that the water ows freely into the sewage collection system or otherwise condensed water may build up in the
unit during heat recovery.
The condensate drainage system is designed for normal operation in premises with air temperatures above 0 °C. If the expected air
temperatures are below 0 °C the condensate drainage system must be equipped with heat insulation and pre-heating facilities.
CONDENSATE DRAINAGE
Fig. 7. Condensate drainage
min 3
°
drain pipe
U-trap
sewage system
tube
tube
min 3°
Precautions:
The unit is designed for mounting on a rigid and stable structure in compliance to the technical data and unit weight.
The unit is mounted with anchor bolts. Make sure that a mounting construction has sucient load capacity for the unit weight.
Otherwise reinforce an installation place by beams, etc. Then insert threaded rods inside the threaded dowels in the ceiling. If the
construction rigidity is not sucient enough it can resonate with the unit and generate abnormal noise and vibration.
While mounting the unit provide enough service space and an access door for maintenance of the lters, heat exchanger and fans.
One access door is required for each unit. For details, refer to the outline drawing, g. 1.
Install anchor bolts M8 into the xation for the ceiling suspension mount and x it with nuts and washers.
Make sure the unit casing has no foreign objects inside, like paper and foil.
If the threaded bolts used for the unit mounting are too short the unit can generate abnormal noise and resonate with the ceiling.
If the unit connection place to the spiral seam duct is supposed to be the source of the abnormal noise, replace the spiral air duct with
a exible air duct. The precautions referred above are normally sucient to solve the resonance problem.
The exible connectors may be also installed to troubleshoot the resonating problem.
To attain the best performance of the unit while mounting provide a straight 1 m duct section on both sides of the unit.
Access to the unit must be prevented by installing a protecting grille or any other device with the mesh width up to 12.5 mm.
DO NOT CONNECT SEVERAL DRAIN PIPES FROM SEVERAL AIR HANDLING UNITS TO ONE U-TRAP!
DIRECT CONDENSATE OUTSIDE WITHOUT CONNECTION TO DRAIN SYSTEM IS NOT ALLOWED!

11
VUT EH
VUT EH
POWER MAINS CONNECTION
VUT 350..600 EH units must be connected to single-phase 230 / 50 Hz AC mains. VUT 800..2000 EH units must be connected to three-
phase 400 V / 50 Hz AC mains depending on the unit type (see Table 3 and Fig. 8). The connection must be made using durable, insulated
and heat-resistant conductors (cables and wires) of appropriate section (see Table 4).
The above conductor cross sections are for reference only. The conductor section selection shall account for the wire type, maximum
permissible wire heating, insulation, length and installation method.
Use only copper core wires. The unit must be properly grounded.
The unit shall be connected to power mains on the terminal block mounted inside the terminal block (VUT 350..600 EH) or inside
the control unit (VUT 800..2000 EH) in accordance with the external connections diagram and terminal designations. All the control and
power wires must be connected according to the terminal markings and the electric polarity!
The unit must be connected to the power mains via an automatic circuit breaker with a magnetic breaker integrated into the house
cabling . The trip current shall be at least equal to the rated current consumption of the unit (see Table 3 and 4).
Fig. 8. Unit wiring diagrams
L
N
X1
1
2
3
N
L
QF
PE
~230 V
50 Hz
Unit
Ɋȿ
5
4
N
N
L2
L1
QF
PE
~400 V
50 Hz L2
L1
X1
2
1
3
L3
L3
Unit
Ɋȿ
Single-phase mains
(VUT 350… 600 EH)
Three-phase mains
(VUT 800… 2000 EH)
Table 4
Type Automatic circuit
breaker rated current
Copper-core
cable
VUT 350..600 EH 20 A, single-phase 3 х 2,5 mm2
VUT 800..1000 EH 20 A, three-phase 5 х 2,5 mm2
VUT 1500..2000 EH 40 A, three-phase 5 х 4 mm2
CONNECTION TO POWER MAINS SHALL ONLY BE PERFORMED BY QUALIFIED PERSONNEL AFTER CAREFUL
READING OF THE USER’S MANUAL.
THE UNIT IS INTENDED FOR AC MAINS SUPPLYINGTHEVOLTAGE COMPLIANT WITHTHETECHNICAL DATATABLE.
CHECK THE CABLE FOR CHOKING. DO NOT TURN ON THE UNIT IF THE CABLE IS DAMAGED. NEVER UNPLUG THE
UNIT FROM THE SOCKET WITH WET HAND OR BY HOLDING THE ELECTRIC CABLE.
THE RATED ELECTRICAL PARAMETERS OF THE UNIT ARE GIVEN ON THE MANUFACTURER’S LABEL. ANY
TAMPERING WITH THE INTERNAL CONNECTIONS IS PROHIBITED AND WILL VOID THE WARRANTY.

12
External devices.
The control panel has a built-in temperature sensor. Therefore, while installing the panel in the operating area ensure at least 1 m
clearance from heating equipment, doors and windows.
The panel is attached to the wall using the self-tapping screws supplied.
The data cable connecting the control panel and the unit shall be routed separately from the power cables. The recommended
minimum distance between the cables is 150 mm.
The control panel is supplied pre-assembled and connected to the unit by the manufacturer. If the repeat installation is necessary,
follow the following steps:
Dismantle the control panel (see Fig. 9):
a) Open the control panel box by pressing on the ends;
b) Use a screwdriver to disconnect the cable from the terminal block;
c) Disconnect the data cable.
Fig. 9. Control panel disconnection
a) b)
Attach the cable as necessary.
Assemble the control panel:
a) Route the cable through the access hole in the bottom lid;
b) Fix the control panel bottom lid where desired and ensure a secure t of the lid to the wall by tightening the self-tapping screw. The
screw head must be clear of the control panel circuit board otherwise causing a risk of equipment damage!
c) Strip the cable of the protective insulation (~20 mm);
d) Strip the wires (~6 mm);
e) Attach the wires to the terminal block according to the markings on the label and the wire colouring:
yellow +
green В
brown А
white ┴
f) Snap the control panel casing in place.
Run the cable through the sealed lead in the control unit casing and connect it to the terminal block contacts (Fig. 10).

13
VUT EH
VUT EH
Fig. 10. Control panel connection
а) b)
e)
yellow +
green В
brown А
white
f)
The temperature sensors are pre-attached by the manufacturer.
For sensor connections on the controller circuit board see Fig. 11.
Fig. 11. Connection to controller circuit board
Terminal block on
the panel
yellow +
green В
brown А
white
Data cable
Outdoor air t°
sensor connector
Supply air t°
sensor connector
1
2
3
4
Controller circuit
board terminal block
yellow 1
green 2
brown 3
white 4
CONTROLLER CIRCUIT BOARD
WALL-MOUNTED CONTROL PANEL

14
2. Remote control panel.
Fig. 12. Remote control panel
1. Control panel display.
2. The right LED indicates an emergency or malfunction (steady glow) or lter replacement necessity (blinking).
3. Temperature sensor.
4. «Up» button - menu navigation (cursor up) or increasing the current parameter value.
5. «Down» button - menu navigation (cursor down) or decreasing the current parameter value.
«Enter» button - selecting the parameter for modication or jumping one menu level down (entering the menu from the
main operation window).
7. «Escape» button - reverting to the higher menu level (interface language change dialogue in the main operation window).
8. «Power» button - unit state control (on/o).
9. The green LED indicates the unit status (steady glow - activated, blinking - TEH blowing, o - deactivated).
12
34567 8
9
UNIT CONTROL
1. General description of the automatic control system.
The unit is controlled via the remote-mounted control panel (Fig. 12). The physical «control panel-unit» data transfer channel is
performed via a four-core data cable up to 10 m in length.
The system enables supply and exhaust fan air capacity control in 3 speed increments:
1 - the minimum speed used in non-residential premises over weekends and holidays or in residential premises at night time;
2 - normal ventilation speed;
3 - intensive ventilation mode when extra air supply is required.
The temperature sensors enable optimum operation mode selection by the system in order to maintain pre-set temperature in
the air duct.
The control panel is equipped with a temperature sensor thereby enabling maintaining of the set (user-dened) indoor
temperature at the selected fan speed or in accordance with the set service function mode (see below). The necessary operation mode
selection as well as the current parameters (i.e. indoor temperature, set temperature, fan speed and heater power) are indicated on the
LCD display.
The energy-saving optimization program calculates the heater power required to sustain the temperature on the premises with
up to 1°C accuracy while adjusting the heater power to 1%.
The air damper (bypass damper) protects the heat exchanger against freezing at low supply air temperature and, if necessary,
excludes supply air from the heat exchange (heat exchanger bypass mode) in the cold ventilation mode.
The system state monitoring program controls the operating parameters of the unit and initiates emergency shutdown in
dangerous situations (i.e. heater overheating or communication loss) by sending corresponding signals to the control panel. Filter
replacement warnings are displayed at user-dened intervals (see below).
All the settings made by the user are saved in the non-volatile memory of the control panel.

15
VUT EH
VUT EH
4. Interface Language Selection.
To change the interface language press the button on the main operation window;
Select a language using the and buttons;
Press the button.
If no button is pressed within 10 seconds or the button is pressed the indicator will revert to the main operation window without
changing the interface language.
5. Programming modes using wall-mounted control panel.
Under normal operation the screen will show the main operation window with the following information (Fig. 13):
Unit deactivation sequence is as follows:
electric heating elements switch o;
The fan switches to a lower speed and continues operating for 2 minutes;
«Heating element blowing» mode is activated. The green LED is blinking.
This operating logic is required to enable heat removal from the electric heating elements and prevent sensor thermal switch activation.
The unit is turned o in 2 minutes.
3. Unit Activation/Deactivation.
Connect the unit to the power mains 1~230 V/50 Hz (for VUT 350..600 EH units) or 3~400 V/50 Hz (for VUT 800..2000 EH units). For
details, refer to connection to power mains, Page 11. The indicator displays the“VENTS”logo, the LEDs are o.
To activate the unit:
Press the button;
Select «On»;
Press the button.
This green LED will go on, the current operation mode is activated and the control panel indicator displays the main operation
window information.
To deactivate the unit:
Press the button;
Select «O»;
Press the button.
The unit switches to the heating elements blowing mode (green LED is blinking) and goes o in 2 minutes. The operation parameters
are selected and modied via the user menu, see below.
Unit status
OFF
ON
Heater blowing
(2 minutes)

16
6. Menu Operation.
The user menu has two levels: the «main menu» and the «service menu».
To enter the menu from the main operation window press the button.
Use the and buttons to navigate between the menu items.
To go back one level and revert to the main operation window press the button.
To enter the currently selected menu item and modify its values press the button.
The unit has two temperature control modes: air temperature on the premises, the «large circuit», and the air temperature in the
supply duct, the «small circuit».
To select a control mode press the or button from the main operation window. This will invoke «Duct» or «Room» controlled
temperature on the display.
The «Room» mode enables air temperature control on the premises using the readings from the control panel integral sensor. The
«Duct» mode enables air temperature control in the supply air duct using the readings from the supply duct sensor (Fig. 13 and 14).
Fig. 13. RC main operation window
Controlled temperature
User-dened controlled temperature
Current operation mode
Clock
Fan speed
Heater power
Room
Set
Vent.
Heat.
Controlled Temperature
User-Dened Controlled Temperature
Current Operation Mode
Clock
Fan speed
Heater Power
duct
set
Vent.
Heat.
Fig. 14. Unit in «Duct» Mode

17
VUT EH
VUT EH
«Filter Replacement Timer»
Enables the user to dene the period after which the control panel will switch to the «reminder mode» displaying the lter replacement
message. The factory setting for the lter replacement timer is 99 days.
This interval can be changed by pressing the and buttons.
The service menu lets the user enable and set up the «service» functions:
«Clock and Calendar»
This function enables setting the current date and time required for correct operation of the «Day Timer» and the «Week Timer». The
non-volatile autonomous (battery) power of the clock keeps the time even while the unit is o.
The battery has 2-3 years of useful life. To replace the battery open the control panel casing by pressing the ends.
Use the button to select a user-dened entry (year, month, date, day, hour, minute).
Change the selected entry by pressing and buttons.
«Speed stage»
Changing the fan speed ( and buttons).
The main menu enables the user to change the critical unit operation parameters such as:
«Temperature Setting»
Changing the control temperature value ( and buttons).
Speed stage
Service menu
Temperature
Temperature setting
Temperature setting
Service menu
Speed stage
Speed stage
Filter replacement timer
Day Timer
Clock and Calendar
Year
Month
Date
Day
Hour
Min.
07
01
01
MON
12
34
Filter replacement timer
Day Timer
Clock and Calendar

18
«Week Timer»
Enables the user to program the unit for any day of the week.
While in this mode the unit will automatically (according to the pre-set parameters) change the fan speed and controlled temperature at
the time and on the days as dened by the user. Furthermore, the Hindicator will show at the «Current Operation Mode» position signalling
the activated weekly timer operation.
THE DAY TIMER HAS HIGHER PRIORITY THEREFORE WHILE THE DAY TIMER IS ACTIVE THE CURRENT OPERATION MODE
POSITION OF THE MAIN OPERATION WINDOW WILL SHOW IRRESPECTIVE OF THE WEEKLY TIMER MODE.
«Day timer»
Enables the user to set the time for switching the unit on and o. While in this mode the unit will switch on and o automatically in the pre-
determined time every 24 hours. Furthermore, the indicator will show at the «Current Operation Mode» position signalling the Day timer
operation.
To change the user-dened position (activation time, deactivation time - hours and minutes) press the button .
Press the and buttons to modify the selected entry.
The factory settings for the Day timer are:
«Turning ON time» - 06:30;
«Turning OFF time» - 23:30.
Filter replacement message:
The reminder message pops up periodically for a brief time replacing the main operation window (the red LED will blink). To acknowledge
the reminder enter the «Filter Replacement Timer» menu and press the button.
The next reminder will appear after the period of time dened by the user. While in the reminder mode the unit will operate normally.
To replace the lters power o the unit rst. Replace the lters and then turn the unit on.
Manual (the user may set the parameters, the day and
weekly timers are o) P
Day Timer 
Week Timer H
The unit can be in any one of the current operation modes such as:
Filter replacement
after 78 days
Replace lter
Day Timer
Week timer
Filter replacement timer
Week timer
Season mode
Day Timer

19
VUT EH
VUT EH
«Seasonal Mode»
In the «Heat Recovery» («Winder» mode) the bypass damper is closed, thus forcing the supply air through the heat exchanger.
To prevent icing the heat exchanger is equipped with a temperature sensor which controls the bypass duct damper. In case of icing
danger the bypass damper on the supply air side is opened. The supply air is then goes through the bypass whereas the exhaust air goes
through the heat exchanger warming up its frozen surface. After the heat exchanger thaws and the exhaust temperature increases the
bypass damper downstream of the heat exchanger shuts closed and the supply air enters the heat exchanger. In the «Open-Closed»
mode the bypass damper operates as follows: open - 5 minutes, closed - 25 minutes, which disables the heat exchanger freezing.
In the «No Heat Recovery» mode («Summer» mode) the bypass damper is constantly open.
To select the user-dened position (day of the week, timer status on the day - on/o, unit operation time in the mode, controlled temperature,
and fan speed) use the button.
To change the selected entry press and buttons.
Table 5
Day State
Interval 1 Interval 2
Activation
Time
Deactivation
Time
Temperature
[°C] Fan Speed Activation Time
Deactivation
Time
Temperature
[°C] Fan Speed
Mon On 8:00 18:00 23 18:00 8:00 20
Tue On 8:00 18:00 23 18:00 8:00 20
Wed On 8:00 18:00 23 18:00 8:00 20
Thu On 8:00 18:00 23 18:00 8:00 20
Fri On 8:00 18:00 23 18:00 8:00 20
Sat On 8:00 18:00 23 18:00 8:00 20
Sun On 8:00 18:00 23 18:00 8:00 20
The factory settings for the weekly timer are stated in Table 5.
23:00-08:00
08:00-23:00
MONDAY ON
Heat recovery
Season mode
No heat recovery
Week timer
Season mode
Day Timer

20
MAINTENANCE
The unit must undergo technical maintenance 3 to 4 times a year. Maintenance includes general cleaning of the unit and the following
operations:
1. Filter maintenance.
Contaminated lters increase air resistance thus impairing supply air delivery into the premises. The lters should be cleaned as they get
dirty, but at least 3-4 times a year. Vacuum cleaning for the air lters is allowed. For new lters contact your Seller.
2. Heat exchanger maintenance.
Even regular technical maintenance of the lters may not completely prevent dirt accumulation on the heat exchanger casing. Clean the
heat exchanger on a regular basis to ensure high heat recovery eciency.To clean the heat exchanger remove it from the unit and wash with
warm neutral detergent solution. Re-install the dry heat exchanger into the unit.
3. Fan maintenance (once a year).
Even regular technical maintenance may not completely prevent dirt accumulation in the fans which reduces the fan capacity and
impairs supply air delivery into the premises.
Clean the fans with a soft sloth or a brush. Do not use water, aggressive solvents or sharp objects as they may damage the impeller.
4. Condensate drain check (once a year).
The condensate drain (line) may get clogged by dirt and dust particles contained in the exhaust air. Check the drain line operation by
lling the drain pan under the unit with water, clean the U-trap and the drain line, if necessary.
5. Fresh air supply duct check (twice a year).
The supply duct grille may get clogged with leaves and other objects reducing the unit performance and supply air delivery. Check the
supply duct grill twice a year and clean it as required.
6. Duct system check (every 5 years).
Even regular fullling of all the prescribed above maintenance operations may not completely prevent dirt accumulation in the air ducts
which reduces the unit capacity. The air duct maintenance includes their periodic cleaning or replacement.
7. Extract shutters and supply diuser cleaning (as required).
Remove the diusers and louvre shutters and wash those with hot soap water. Do not change the mounting position of the diusers
and the shutters.
7. Emergency Alarms.
On triggering of either the sensor thermal switch deenergizing the heating elements or in case of lter clogging (which triggers the
dierential pressure sensor) or communication line damage the unit enters the emergency «Electric heating elements blowing» mode with
subsequent shutdown in 2 minutes. The red LED goes on, and the control panel displays the message about the malfunction and its origin.
Fault!!!
Heater overheating
Unit OFF
Fault!!!
Filter clogging
Unit OFF
Fault!!!
No communication
Unit OFF