System air Danvent DV User manual

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Danvent DV, Danvent TIME
Air Handling Units
User Manual
GB

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Introduction
Detailed table of contents on the following pages
1. Manufacturer
2. Declaration of confor ity
3. Description of the air handling units
4. Intended use, noise and vibration
5. Protection and safety easures
6. Electrical connection
7. Plu bing
8. Acco panying docu ents
9. Start-up
10. Co issioning
11. DVU - Wiring diagra for internal controller
12. Menu for internal controller in the DVU

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Contents
1. MANUFACTURER ...................................................................................................................................................................... 8
1.1 Manufacturer, supplier data .......................................................................................................................... 8
1.2 Na e of achines ......................................................................................................................................... 8
2. DECLARATION OF CONFORMITY ......................................................................................................................................... 9
3. DESCRIPTION OF THE AIR HANDLING UNITS – 8 MODELS ...................................................................................... 10
3.1 Co on for all air handling unit odels ...................................................................................................... 10
3.2 Specific data about each odel of the air handling unit – 8 odels .............................................................. 10
3.2.1 DV unit without switchboard/control system ................................................................................................. 10
3.2.2 T ME unit – indoor model................................................................................................................................ 10
3.2.3 T ME unit – outdoor model ............................................................................................................................. 11
3.2.4 DV unit with switchboard/control system – delivered in several sections ..................................................... 11
3.2.5 DV unit with switchboard/control syste – delivered as one section on base fra e .............................. 12
3.2.6 DV unit with switchboard and control components, without controller – delivered in several sections ....... 12
3.2.7 DV unit with switchboard and control components, without controller – delivered as one section on base
frame ........................................................................................................................................................................ 13
3.2.8 DVU – section (cooling unit) ............................................................................................................................ 14
4. INTENDED USE, NOISE AND VIBRATION ........................................................................................................................ 20
4.1. Intended use and range of applications ....................................................................................................... 20
4.2 Unintended use and isuse – inappropriate applications for the achine ................................................... 20
4.3 Air handling unit in operation ...................................................................................................................... 20
4.4 Maintenance, repair, dis antling and disposal ............................................................................................ 20
4.4.1 Protective measures ........................................................................................................................................ 20
4.4.2 Sharp edges ..................................................................................................................................................... 20
4.4.3 Filters ............................................................................................................................................................... 20
4.5 Disposal easures ....................................................................................................................................... 20
4.5.1 DVU – cooling system ...................................................................................................................................... 21
4.5.2 Sharp edges ..................................................................................................................................................... 21
4.6 Use/operation of the achine ..................................................................................................................... 21

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4.7 Prohibited use of the achine ..................................................................................................................... 21
4.8 Noise and vibration ...................................................................................................................................... 21
. PROTECTION AND SAFETY MEASURES .......................................................................................................................... 22
5.1 Protection easures and additional protection easures ............................................................................ 22
5.2 Necessary protection easures prior to start-up. ......................................................................................... 22
5.2.1. Design of protection measures ...................................................................................................................... 22
5.2.2. Configuration of frequency converters with inspection doors closed ........................................................... 22
5.3 Safe adjust ent and aintenance ............................................................................................................... 22
5.4 Safety precautions during adjust ent and aintenance .............................................................................. 22
5.5 Personal protective equip ent for aintenance staff – health and safety ................................................... 22
6. ELECTRICAL INSTALLATION .............................................................................................................................................. 23
6.1 Description................................................................................................................................................... 23
6.2 Wiring diagra s ........................................................................................................................................... 23
6.2.1 Wiring diagrams for Time units ....................................................................................................................... 23
6.2.2 Wiring diagrams for DV units with switchboard/control system .................................................................... 23
6.2.3 Wiring diagram for DV units with switchboard and control components but without the intelligent
controller .................................................................................................................................................................. 23
6.3 Installation of ains power supply ............................................................................................................... 24
6.3.1 Necessary mains power supply for T ME units ............................................................................................... 24
6.3.2 Necessary mains power supply for DV units with switchboard/control system ............................................. 24
6.4 Electrical connection of co ponents and functions ...................................................................................... 24
6.4.1 Repeater .......................................................................................................................................................... 24
6.4.2 Extended operation ......................................................................................................................................... 24
6.4.3 Valve and valve motor for heating coil ........................................................................................................... 25
6.4.4 Valve and valve motor for cooling coil ............................................................................................................ 25
6.4.5 DX cooling ........................................................................................................................................................ 25
6.4.6 Circulation pump, heating ............................................................................................................................... 25
6.4.7 Fire protection function .................................................................................................................................. 25
6.4.8 Communication with BMS systems ................................................................................................................. 26
6.4.9 E tool programme ........................................................................................................................................... 26
6.4.10 Electrical heater battery ................................................................................................................................ 26
6.4.11 Frequency converter ..................................................................................................................................... 26
6.4.12 Pressure transmitters .................................................................................................................................... 27
6.4.13 Switchboard .................................................................................................................................................. 27

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6.4.14 Temperature sensors .................................................................................................................................... 27
6.4.15 Damper motors ............................................................................................................................................. 27
6.4.16 Filter guards................................................................................................................................................... 27
6.4.17 Room temperature sensors ........................................................................................................................... 27
6.4.18 Frost protection ............................................................................................................................................. 28
6.4.19 Systemair Control Panel ................................................................................................................................ 28
6.4.20 Cooling recovery ............................................................................................................................................ 28
6.4.21 Free cooling ................................................................................................................................................... 28
6.4.22 Alarm signal ................................................................................................................................................... 28
6.4.23 Heat recovery ................................................................................................................................................ 28
6.4.24 Frost protection – plate heat exchanger ....................................................................................................... 28
7. PLUMBING ................................................................................................................................................................................ 29
7.1 Description................................................................................................................................................... 29
7.2 Pipe connections .......................................................................................................................................... 29
7.3 Possibility of extracting co ponents fro the unit ...................................................................................... 29
7.4 Pipe connections to batteries ....................................................................................................................... 29
7.4.1 Heating coils .................................................................................................................................................... 29
7.4.2 Cooling coils..................................................................................................................................................... 29
7.4.3 Rigid bearings for valves, circulation pumps and pipe system ........................................................................ 29
7.5 Draining condensate water .......................................................................................................................... 30
7.6 Draining condensate water fro plate heat exchanger ................................................................................ 30
7.7 Draining condensate water fro cooling battery ......................................................................................... 31
8. ACCOMPANYING DOCUMENTS .......................................................................................................................................... 31
8.1 Print-outs on paper ...................................................................................................................................... 31
8.1.1 DV unit without switchboard .......................................................................................................................... 31
8.1.2 T ME and DV units with switchboard/control system ..................................................................................... 31
8.1.3 DV units with switchboard and control components – without controller ..................................................... 32
8.2 Electronic edia .......................................................................................................................................... 32
9. START-UP ................................................................................................................................................................................. 33
9.1 Checklist, relevant values ............................................................................................................................. 33
9.1.1 Checklist prior to start-up ............................................................................................................................... 33
9.1.2 Switch on power .............................................................................................................................................. 33
9.1.3 Enter relevant values in the controller ............................................................................................................ 33

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10. COMMISSIONING ................................................................................................................................................................. 33
11. DVU - WIRING DIAGRAM FOR INTERNAL CONTROLLER IN THE DVU SECTION ............................................. 34
12. MENU FOR INTERNAL CONTROLLER IN THE DVU SECTION ................................................................................. 3

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1. Manufacturer
1.1 Manufacturer, supplier data
This User Manual covers all air handling units delivered by Systemair A/S.
Manufacturer and supplier data:
Systemair A/S
Ved Milepælen 7
DK-8361 Hasselager
Responsible: Ulf Bang
1.2 Name of machines
This manual is about Systemair air handling units called Danvent DV Units and Danvent T ME Units.

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2. Declaration of Conformity
Declaration of Conformity
The manufacturer:
Systemair A/S
Ved Milepælen 7
DK - 8361 Hasselager
hereby declares that air handling units of the flowing types:
DANVENT DV delivered without control systems
DANVENT DV delivered with control systems
TIME
are manufactured and delivered in accordance with following directives:
Machinery directive 2006/42/EC
EMC - directive 2004/108/EC
Low voltage directive 2006/95/EC
Pressure equipment directive 97/23/EC
The declaration is only valid if the installation of the air handling unit is carried out according to the
instructions delivered with the unit. The installer will be responsible for the CE declaration and
documentation, if any construction or functional changes are applied to the air handling unit.
Hasselager 5 May 2010

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3. Description of the air handling units – 8 models
3.1 Common for all air handling unit models
All Danvent DV and T ME air handling units are manufactured in compliance with the EC Declaration of
Conformity and they are CE marked as machines. f the buyer carries out changes or adds components in or
on the machine, the buyer must issue a new EC Declaration of Conformity and a new CE marking of the
machine. The buyer must issue a new EC Declaration of Conformity and a new CE marking of the machine,
when a unit is delivered without control system and the control system is installed in the unit on the site.
To promote correct use of the machines, the below-mentioned instructions are an integral part of the
machine:
•Transport and nstallation Manual – printed on paper and delivered with the unit
•User Manual - printed on paper and delivered with the unit
•Transport and nstallation Manual, User Manual, Operator’s Guide, Commissioning protocol ,
Maintenance, Dismantling and Disposal Manual, Data sheets about components in the control
system – all on a CD delivered with the unit
3.2 Specific data about each model of the air handling unit – 8 models
3.2.1 DV unit without switchboard/control system
DV unit without switchboard/control system is a unit without an intelligent controller and without
components for the control of functions. This model is, however, usually delivered with some electric
components - for example fan motors, motor for turning the rotary heat exchanger as well as the internal
control system for revolutions per minute of the rotor. The common rule for this model is that no
components are connected to an intelligent controller. The machine is CE marked, and installation of
control system and other changes of the machine have the consequence that the buyer must issue a new
EC Declaration of Conformity and a new CE marking of the machine.
3.2.2 TIME unit – indoor model
The indoor model of T ME has an integrated control system and the switchboard mounted on the unit. The
switchboard is always mounted on the unit section with the supply air fan. The intelligent controller -
Systemair E28 – is mounted in the switchboard, and all electrical connections between switchboard and
components in the unit are installed. The control system is configured according to the customer’s order –
confirmed by the order confirmation - to promote easy start-up on the site. The unit is tested at the factory
and all functions are confirmed by a final functional test and test report. After the final test the unit is
divided into at least 2 and for larger units up to 6 sections to facilitate the transport. After reassembly of
the unit on the site, the clearly marked cables must be reconnected in the marked switchboard terminals.
Furthermore all external components must be connected on the site.
3.2.2.1 External co ponents
External components are Systemair Control Panel, valves, valve motors, pressure transmitters, supply air
temperature sensor, sensor for water temperature in the heating coil (if water heating coil was requested)
and circulation pump (Systemair does not deliver the pump). Supply air temperature sensor and sensor for
water temperature in the heating coil are cabled to the terminals in the switchboard. Terminals are present
in the switchboard for pressure transmitters, if it is a solution for constant pressure in the ducts, and

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terminals are present in the switchboard for valve motors and circulation pump, but cables are not installed
and not connected to terminals in the switchboard. The Systemair Control Panel with 10 metres of cable is
not connected to the controller in the switchboard. All external components delivered are packed in a
cardboard box delivered together with the unit.
3.2.3 TIME unit – outdoor model
The outdoor model of T ME has an integrated control system and the switchboard mounted inside the unit.
The switchboard is always mounted in the unit section with the heat exchanger and the switchboard is
always placed at the warm side of the heat exchanger. The intelligent controller - Systemair E28 – is
mounted in the switchboard, and all electrical connections between switchboard and components in the
unit are installed. The control system is configured according to the customer order – confirmed by the
order confirmation to promote easy start-up on the site. The unit is tested at the factory and all functions
are confirmed by a final functional test and test report. The unit is delivered as one assembled section on
base frame. All external components must be connected on the site.
3.2.3.1 External co ponents
External components are Systemair Control Panel, valves, valve motors, pressure transmitters, supply air
temperature sensor, sensor for water temperature in the heating coil (if water heating coil was requested)
and circulation pump (Systemair does not deliver the pump). Supply air temperature sensor and sensor for
water temperature in the heating coil are cabled to the terminals in the switchboard. Terminals are present
in the switchboard for pressure transmitters, if it is a solution for constant pressure in the ducts, and
terminals are present in the switchboard for valve motors and circulation pump, but cables are not installed
and not connected to terminals in the switchboard. The Systemair Control Panel with 10 meters of cable is
not connected to the controller in the switchboard. All external components delivered are packed in a
cardboard box delivered together with the unit.
3.2.4 DV unit with switchboard/control system – delivered in several sections
This model of the DV unit has an integrated control system and depending on the size of the unit, the
switchboard is installed on the unit or on the front of the unit. The intelligent controller - Systemair E28 – is
mounted in the switchboard, and all electrical connections between switchboard and components in the
unit are installed. The control system is configured according to the customer’s order – confirmed by the
order confirmation - to promote easy start-up on the site. The unit is tested at the factory and all functions
are confirmed by a final functional test and test report. After the final test the unit is divided in sections to
facilitate the transport. After reassembly of the unit on the site, the clearly marked cables with sockets
must be reconnected in the marked switchboard terminals. Cable strips are preinstalled in glue plinths for
installation of the cables between the components in the unit-sections and the switchboard. Cables
installed on the unit-sections in the pre-installed strips in glue plinths are protected by metal covers. The
covers have been removed before installation of the cables and must be replaced after installation of the
cables.
Mains power supply must be installed directly in the marked circuit breakers for fan motor frequency
converters and DVU (section with cooling compressor). All external components must be connected on the
site.
3.2.4.1 External co ponents
External components are Systemair Control Panel, valves, valve motors, pressure transmitters, supply air
temperature sensor, sensor for water temperature in the heating coil (if water heating coil was requested)
and circulation pump (Systemair does not deliver the pump). Supply air temperature sensor and sensor for

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water temperature in the heating coil are cabled to the terminals in the switchboard. Terminals are present
in the switchboard for pressure transmitters, if it is a solution for constant pressure in the ducts, and
terminals are present in the switchboard for valve motors and circulation pump, but cables are not installed
and not connected to terminals in the switchboard. The Systemair Control Panel with 10 meters of cable is
not connected to the controller in the switchboard. All external components delivered are packed in a
cardboard box delivered together with the unit.
3.2. DV unit with switchboard/control system – delivered as one section on base frame
This model of the DV unit has an integrated control system and the switchboard mounted inside the unit.
The switchboard is always mounted in the unit section with the heat exchanger and the switchboard is
always placed at the warm side of the heat exchanger. The intelligent controller - Systemair E28 – is
mounted in the switchboard, and all electrical connections between switchboard and components in the
unit are installed. The control system is configured according to the customer’s order – confirmed by the
order confirmation - to promote easy start-up on the site. The unit is tested at the factory and all functions
are confirmed by a final functional test and test report. The unit is delivered as one assembled section on
base frame. All external components must be connected on the site.
3.2.5.1 External co ponents
External components are Systemair Control Panel, valves, valve motors, pressure transmitters, supply air
temperature sensor, sensor for water temperature in the heating coil (if water heating coil was requested)
and circulation pump (Systemair does not deliver the pump). Supply air temperature sensor and sensor for
water temperature in the heating coil are cabled to the terminals in the switchboard. Terminals are present
in the switchboard for pressure transmitters, if it is a solution for constant pressure in the ducts, and
terminals are present in the switchboard for valve motors and circulation pump, but cables are not installed
and not connected to terminals in the switchboard. The Systemair Control Panel with 10 meters of cable is
not connected to the controller in the switchboard. All external components delivered are packed in a
cardboard box delivered together with the unit.
3.2.6 DV unit with switchboard and control components, without controller – delivered in
several sections
This model of the DV unit has control components and depending on the size of the unit, the switchboard is
installed on the unit or on the front of the unit. t is also possible to install the switchboard beside the unit
with the distance allowed by the length of the cable that cannot exceed 10 meters.
The installed control components could be;
•Frequency converter
•Damper motors
•Temperature sensors
•Pressure transmitters
•Valves and valve motors
•Fire thermostats
•Smoke detectors
•CO2 sensors
•Lamps
•Supply disconnecting devices

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All electrical connections are installed between terminals in the switchboard and components in the unit.
The components are not tested at the factory and the frequency converters are not configured with the
correct data. Only components listed in the customer’s order and confirmed by the order confirmation are
delivered with the unit. After installation of components and cables in the unit, the unit is divided into
sections to facilitate the transport. After reassembly of the unit on the site, the clearly marked cables with
sockets must be reconnected in the marked switchboard terminals. Cable strips are preinstalled in glue
plinths for installation of the cables between the components in the unit-sections and the switchboard.
Cables installed on the unit-sections in the pre-installed strips in glue plinths are protected by metal covers.
The covers have been removed before installation of the cables and must be replaced after installation of
the cables.
Mains power supply must be installed directly in the marked circuit breakers for fan motor frequency
converters and DVU (section with cooling compressor). All external components must be connected on the
site.
3.2.6.1 External co ponents
External components are Systemair Control Panel, valves, valve motors, pressure transmitters, supply air
temperature sensor, sensor for water temperature in the heating coil (if water heating coil was requested)
and circulation pump (Systemair does not deliver the pump). Supply air temperature sensor and sensor for
water temperature in the heating coil are cabled to the terminals in the switchboard. Terminals are present
in the switchboard for pressure transmitters, if it is a solution for constant pressure in the ducts, and
terminals are present in the switchboard for valve motors and circulation pump, but cables are not installed
and not connected to terminals in the switchboard. The Systemair Control Panel with 10 meters of cable is
not connected to the controller in the switchboard. All external components delivered are packed in a
cardboard box delivered together with the unit.
3.2.7 DV unit with switchboard and control components, without controller – delivered as one
section on base frame
This model of the DV unit has control components and the switchboard installed on the unit or inside the
unit.
The installed control components could be;
•Frequency converter
•Damper motors
•Temperature sensors
•Pressure transmitters
•Valves and valve motors
•Fire thermostats
•Smoke detectors
•CO2 sensors
•Lamps
•Supply disconnecting devices
All electrical connections are installed between terminals in the switchboard and components in the unit.
The components are not tested at the factory and the frequency converters are not configured with the
correct data. Only components listed in the custome’s order and confirmed by the order confirmation are
delivered with the unit.

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Mains power supply must be installed directly in the marked circuit breakers for fan motor frequency
converters and DVU (section with cooling compressor). All external components must be connected on the
site.
3.2.7.1 External co ponents
External components are Systemair Control Panel, valves, valve motors, pressure transmitters, supply air
temperature sensor, sensor for water temperature in the heating coil (if water heating coil was requested)
and circulation pump (Systemair does not deliver the pump). Supply air temperature sensor and sensor for
water temperature in the heating coil are cabled to the terminals in the switchboard. Terminals are present
in the switchboard for pressure transmitters, if it is a solution for constant pressure in the ducts, and
terminals are present in the switchboard for valve motors and circulation pump, but cables are not installed
and not connected to terminals in the switchboard. The Systemair Control Panel with 10 meters of cable is
not connected to the controller in the switchboard. All external components delivered are packed in a
cardboard box delivered together with the unit.
3.2.8 DVU – section (cooling unit)
The air handling unit section – DVU – is a separate section in the air handling unit, and the section contains
a complete stand-alone cooling compressor system. The system has been started, adjusted and optimized
before the delivery. The refrigerant is evaporated directly in the cooling coil and the cooling capacity is
regulated automatically and steplessly between 10 and 100 %. The system is delivered with the HFC
refrigerant R-407C in the circuit.
nternally in the section a DVU-internal controller - LMC251 - and complete control system take care of all
safety functions as well as the frequency converter regulated compressor that creates exactly the cooling
capacity ordered by the main air handling unit controller via the very common 0-10V DC signal. When the
demand for cooling occurs in the room, the main air handling unit controller sends a start signal and a
signal exceeding 0 volt to the cooling compressor system. When the signal exceeds 1.5 volt the cooling
compressor starts. After start-up the capacity is regulated between 10 and 35 % by the hotgas valve (HGV
in the illustration below) in on/off in sequences with the cooling compressor at the lowest number of
revolutions. When more than 35 % of the cooling capacity is demanded (signal exceeds more than 3,5 volt)
the hotgas valve closes, the cooling capacity is regulated by the frequency converter (FC in the illustration
below) to the strictly necessary revolutions of the compressor. By declining demand with the compressor at
the lowest revolutions, the hotgas valve is regulated on/off in sequences, when the demand is less than 34
%. The cooling compressor stops when the demand is less than 10 %.
To avoid that the compressor stops because the high pressure switch (Hp in the illustration below) cuts off,
an automatic capacity reduction system is installed. The capacity reduction system consists of a pressure
transducer (P in the illustration below) installed in the high pressure pipe between the compressor and the
condenser and software in the DVU-internal controller that reduces the revolutions of the compressor to
avoid that the pressure after the compressor develops to the cut-off pressure of the high pressure switch –
the system does not stop; it will always remain cooling to some extent.
Air volume capacities for supply fan and for exhaust fan are not regulated by the built-in controller –
LMC251 - for the cooling system, but by the main air handling unit controller. The technician fro a
certified installer of cooling units must agree with the installer of the ventilation system and the main air
handling unit controller that the air volumes for the system are not going to exceed the maximum or to be
lower than the recommended minimum mentioned below in section 3.2.8.18 in this manual

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3.2.8.1 Using the control panel of the DVU-internal controller for the cooling
co pressor syste
Two LEDs (light diodes) are placed on the DVU-internal controller and each of the LEDs can be on or flash
green, red or orange. During normal conditions a permanent green light indicates that everything is normal,
orange indicates alternative running mode while red indicates alarm.
LED Off
Gr
een
flashing
Green
Orange
flashing
Orange
R
e
d
flashing
Red
Upper LED
Off
-
signal fr
om
main AHU
controller
..
On
-
signal fr
om
main AHU
controller
.. .. .. ..
Lower LED .. ..
Compressor
active
..
Hotgas
active
Alarm ..
Priorities of the collars are:
1. Red (highest priority)
2. Red Flashing
3. Orange
4. Orange Flashing
5. Green
6. Gren Flashing (Lowest priority).
Extract
Rel
ay
out
Digital
-
in
3*400
VAC
RS485
COM
Rel
ay
-
out
Analog
-
in
Rel
ay
out
Analog
in
Digital in
Alar out
CapReg
On/of
Alar
Supply

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3.2.8.2 Background illu ination of the display
Background illumination of the display switches on automatically when the potentiometer is turned or
pressed. The illumination switches off one minute after the last activation of the potentiometer. By alarm
the illumination flashes until the alarm is acknowledged
3.2.8.3 Potentio eter on the internal controller for the cooling co pressor syste
The potentiometer is the only tool for the selection of menus and for changing parameters in the DVU-
internal controller. The potentiometer is at the right side of the display.
The potentiometer has 3 functions:
1. Turn clockwise : Go to the next menu item or increase parameter value
2. Turn anticlockwise : Go to the previous menu item or decrease parameter value
3. Press : Select menu, start change of parameter or acknowledge and store new value
3.2.8.4 Selection of enu
Turn the knob to change menu. When an arrow is shown to the right at the bottom of the display, the
menu has a submenu. The submenu is activated by pressing the knob once. f the knob is turned in the
submenu you will scroll between the items in the submenu.
Leave the submenu by turning the potentiometer clockwise or anticlockwise until the "menu up" is shown.
Press to leave the submenu.
3.2.8.5 Change para eters
Turn the knob until the required parameter is shown in the display. Press the knob and turn until the
required value is shown. Press the button once more to acknowledge and store the value.
Flashing parameter value in the display indicates that changes are being made and not yet acknowledged
and stored.
3.2.8.6 Menu – drawing of the enu to guide the user
Drawing of the menu appears from section 12
3.2.8.7 The start display
The start picture shown when the potentiometer has not been activated for 10 minutes
•n: nnn% shows the capacity ordered by the main air handling unit controller.
•Out: nnn% shows the capacity ordered by this internal controller - LMC251 – of the compressor.
3.2.8.8 Settings
About basic settings in the submenus in the LMC251
3.2.8.9 Auto atic resets of the high pressure switch
This is about the maximum number of automatic resets of the high pressure switch that are acceptable
within one hour. f this number is exceeded, the unit will be shut down until the high pressure switch has
been reset manually.
3.2.8.10 Polarity
The Alarm polarity can be set to”Normally Open” or ”Normally Closed”.

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3.2.8.11 Hotgas – setting of period
This is the number of seconds that the hotgas valve is open. The period is relatively long, but the supply
temperature is not oscillating at all and the stability of the supply temperature is sufficient. The number of
seconds is a factory setting that should not be reduced. Reduction of the number of seconds will not
improve the stability of the temperature to a degree that can be proven by measurements. f the number
of seconds is reduced, the number of times that the valve is opened and closed will be increased – maybe
considerably, and the valve could be worn out prematurely.
3.2.8.12 Li iter
DeltaMax is the maximum acceptable change in % / second of the actual cooling capacity.
3.2.8.13 Service
n this menu information about the software version in the controller as well as 2 submenus – “Manual
operation” and “Runtime”
3.2.8.14 Manual operation
When the menu – Manual operation - is activated, the technician is able to control the operation manually,
when the start signal from the main air handling unit controller is on (start signal is just potential free
connection of the two terminals – 3&4). This procedure is relevant for the test during the annual
maintenance with the control of all safety and regulation procedures or after installation of new
components.
f no new settings have been carried out on the controller for 10 minutes, the menu – Manual operation –
is deactivated, and the unit returns to the automatic mode.
3.2.8.15 Running hours and hotgas activations
n this menu the number of running hours for the compressor, and the number of activations of the hotgas
valve can be read. This information is valuable for the maintenance.
3.2.8.16 Alar
3.2.8.16.1 Alar
Show the actual alarm with alarm number.
3.2.8.16.2 Alar Log
The last 15 alarms are logged and it is not possible to delete them. No time-stamps on the stored alarms.
3.2.8.17 Modified software in Danfoss frequency converter for the co pressor
The standard settings in the Danfoss frequency converter have been changed in 2 menu items, because the
safety functions in these menus are transferred to the DVU-internal controller - LMC251;
- n the menu item 5-10 Terminal 18, digital input (start), the value must be changed from 8 to 0.
- n the menu item 5-12 Terminal 27, digital input (free running inverted), the value must be changed
from 2 to 0.

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Especially for co pressor VTZ 121 in DVU 25 and DVU 30
n addition to the above-mentioned modifications, the modifications below are necessary for the
compressor VTZ 121 in DVU 25 and DVU 30;
-Value in menu item 1-90 changed to 2
-Value in menu item 1-93 Terminal 54 changed to 2
Usually the Danfoss frequency converter keeps the change to the standard factory setting stored for ever,
but if the software has been turned back to the original factory setting for some reason, the above-
mentioned modifications must be carried. f the modifications are not carried out correctly, the compressor
will not be switched on at all.
3.2.8.18 Maintenance
General maintenance must be carried out according to national and local regulations by a skilled technician
from a certified company.
List of spare parts as well as datasheets from the manufacturers are available on the CD delivered with the
unit.
Air volu e, cooling capacity, refrigerant content
DVU
-
10
DVU
-
15
DVU
-
20
DVU
-
25
DVU
-
30
DVU
-
40
Width i
n
970
1120
1270
1420
1570
1720
Height i
n
970
1120
1270
1420
1570
1720
Length i
n
970
1120
1120
1270
1270
1270
Weight in kg
190
240
280
375
400
475
Power supply
–
3F, N, PE
3x400V,
N, PE,
10A
3x400V,
N, PE,
16A
3x400V,
N, PE,
20A
3x400V,
N, PE,
25A
3x400V,
N, PE,
25A
3x400V,
N, PE,
32A
No inal air volu e, 3/s
0.8
1.11
1.65
2.33
2.65
3.33
Mini u
air volu e, 3/s
0.3
0.4
0.5
0.6
0.9
1.0
Test pressure, bar
28.6
28.6
28.6
28.6
28.6
28.6
Refrigerant
R407C
R407C
R407C
R407C
R407C
R407C
Refrigerant content in kg
3
3
4.5
6
6
9.8
Cooling capacity at no inal
air volu e when:
Outdoor 28°C/50% r. H.
Roo 25°C/50% r. H.
Supply air 18°C/90% r. H.
11.1 kW
15.7 kW
23.3 kW
33.8 kW
36.7 kW
47.3 kW
Nominal air volume = highest air volume, where outdoor air is 28 ºC/50% r.H. and is chilled by 10 ºC.
3.2.8.19 Cooling capacity and absorbed power consu ption in kW for co pressor - EER factor
Cooling capacity and absorbed power consumption data is listed in the table below for calculation of the
energy performance of the building. Cooling capacity and absorbed power consumption are listed for 3
levels – minimum – medium – and maximum revolutions for the cooling compressor when the evaporation
temperature is 10 °C and condensation temperature is 50 °C. Maximum cooling capacity at nominal air flow

19
when supply air flow is equal to exhaust air flow, outdoor 28 °C/50% r.H., indoor 25 °C/50% r.H. and supply
air 18 °C/90% r.H..
Cooling capacity in kW/absorbed power consu ption in kW and EER-value – all at no inal air volu e
DVU
-
10
DVU
-
15
DVU
-
20
DVU
-
25
DVU
-
30
DVU
-
40
Mini u
–
35 Hz
5.6/1.2
-
4.5
7.7/1.9
-
4.1
11.5/2.2
-
5.2
15.7/3.3
-
4.7
18.5/3.8
-
4.9
23.2/4.5
-
5.1
Mediu
–
60 Hz
8.9/2.3
-
3.8
12.4/3.4
-
3.7
18.5/4.3
-
4.4
27.5/7.1
-
3.9
29.6/7.1
-
4.2
39.7/9.4
-
4.2
Maxi u
–
90 Hz
11.1/3.7
-
3.0
15.7/5.4
-
2.9
23.3/6.9
-
3.4
33.8/11.1
-
3.0*
36.7/11.3
-
3.2*
47.3/13.2
-
3.6
*85 Hz
The minimum capacity is selected at the frequency converter output at 35 Hz (the compressor in the DVU
20, 25/30 and 40 can reduce the capacity further to even lower revolutions at 30 Hz). At the lowest
revolutions the hotgas valve opens to reduce the capacity further – the lowest cooling capacity equals 10 %
of the capacity at 90 Hz. f the temperature and humidity conditions on the site deviate from the above-
mentioned conditions, accurate values can be calculated in the design programme SystemairCAD.
Systemair is ready to provide you with a print-out, if a copy of calculation of the specific unit in the
SystemairCAD is not available.
3.2.8.20 Power consu ption for the fans
The unit section - DVU - is one of several sections in the air handling unit, and the supply air fan for the
evaporator as well as the exhaust air fan for the condenser, heat recovery and heating coil are installed in
other sections. The energy performance for the complete unit including the consumption of the fans is
always calculated in the design programme SystemairCAD. Systemair is ready to provide you with a print-
out, if a copy of the calculation of the specific unit in the SystemairCAD is not available.
3.2.8.21 Data plate
The data plate for the cooling unit is mounted inside the unit section – DVU – behind one of the doors. An
exa ple of the data plate is shown below.
DVU-40
Refrigerant 407C - 10,0 kg
Compressor Danfoss VTZ171
Supply voltage 3*400 V + N + PE
Running load ampere 32 A
Main circuit breaker 35 A
Short circuit level min 1,0 kA
Short circuit level max 7,3 kA
Max working pressure 26 bar
Testing pressure 32 bar

20
4. Intended use, noise and vibration
4.1. Intended use and range of applications
The air handling units are intended for the transport and treatment of air between -40 °C and + 60 °C
The units are exclusively for comfort ventilation and not for air that causes severe corrosion to galvanized
steel and to copper and aluminum.
4.2 Unintended use and misuse – inappropriate applications for the machine
The air handling units are not suitable for transport of air with risk of explosion and with Ex-Classification.
Do not install the units in Ex-areas at all.
Do not install units outdoors unless the units are constructed for outdoor installation. Units not suitable for
outdoor installation are units without roof and units with switchboard installed on the on the unit (the
switchboard is installed inside the unit for outdoor installation).
4.3 Air handling unit in operation
The pressure difference between interior and exterior of the unit must not exceed 2000 Pa for the DV 10
and up to DV 150 (including DV 150), and 1500 Pa for DV 190 and DV 240.
Before start-up of the unit all ducts, guards and all protective devices must be mounted to prevent any
access to rotating fan impellers. All inspection doors must be closed and locked when the unit is in
operation.
4.4 Maintenance, repair, dismantling and disposal
Procedures for maintenance, repair, dismantling and disposal are described in the Maintenance,
Dismantling and Disposal Manual, but the most essential health and safety measures are described in this
section.
4.4.1 Protective measures
To protect persons against injuries, the units are provided with fan guards, and the fan guards are the
inspection doors. The guard measures are described further in section 5 - Protection and safety measures.
Before maintenance and repair, the unit must be switched off by the supply disconnecting device, and this
must be locked with a padlock.
4.4.2 Sharp edges
The unit contains of metal plates with several sharp edges. To avoid injury during maintenance and repair,
CE-marked cut-resistant gloves as well as helmet must be used. The measures are described further in the
Maintenance, Dismantling and Disposal Manual.
4.4.3 Filters
Use particulate respirator when filters are replaced. The measures are described further in the –
Maintenance, Dismantling and Disposal Manual.
4. Disposal measures
The disposal measures are described further in the Maintenance, Dismantling and Disposal Manual.
Essential health and safety measures are described in this section.