Vents VUT 300 E2V EC User manual

USER’S MANUAL
VUT 300 E2V EC
VUT 300-2 E2V EC
Heat recovery air handling unit

2VUT 300 E2V EC
Safety requirements .................................................................................
Introduction ................................................................................................
Purpose .........................................................................................................
Delivery set ..................................................................................................
Designation key .........................................................................................
Technical data .............................................................................................
Unit design and operating principle ..................................................
Mounting and set-up ...............................................................................
Condensate drainage .............................................................................
Connection to power mains ..................................................................
Unit control .................................................................................................
Technical maintenance ...........................................................................
Troubleshooting ........................................................................................
Storage and transportation regulations ...........................................
Manufacturer’s warranty ........................................................................
Acceptance certicate .............................................................................
Seller information .....................................................................................
Connection certicate .............................................................................
Warranty card .............................................................................................
CONTENTS
3
5
5
5
6
6
9
10
12
12
14
21
24
24
25
24
2б
27
27

3
VUT 300 E2V EC
SAFETY REQUIREMENTS
• Read the user’s manual carefully prior to the operation and installation of the heat recovery air
handling unit (hereinafter referred to as «the unit»).
• Full the user’s manual requirements as well as the provisions of all the applicable local and national
construction, electrical and technical norms and standards.
• The warnings contained in the user’s manual must be considered most seriously since they contain
vital personal safety information.
• Failure to follow the safety requirements noted in this user’s manual may result in an injury or unit
damage.
• After a careful reading of the manual, keep it for the entire service life of the unit.
• While transferring the unit control the user’s manual must be turned over to the receiving operator.
Symbol legend:
UNIT MOUNTING SAFETY PRECAUTIONS
WARNING!
DO NOT!
Disconnect the unit from power
mains prior to any installation
or repair operations.
The unit must be
grounded!
The unit must not be operated
outside the temperature range
stated in the user's manual
and in aggressive or explosive
environments.
Do not use damaged
equipment or cables when
connecting the unit to
power mains.
While installing the unit follow
the safety regulations specic
to the use of electric tools.
Unpack the unit with care.
Do not change the power cable
length at your own discretion.
Do not bend the power cable.
Avoid damaging the power
cable.
Do not position any
heating devices or other
equipment in close
proximity to the unit
power cable.

4VUT 300 E2V EC
Do not touch the unit
controls with wet hands.
Do not carry out the unit
maintenance with wet
hands.
Do not wash the
unit with water.
Protect the unit electric
parts from water ingress.
Use the unit only
as intended by the
manufacturer. Do not
connect a clothes dryer or
other similar equipment
to the unit or the
ventilation system.
Do not put any water
containers on the unit, i.e.
ower vases.
Do not sit on the unit
and avoid placing foreign
objects on it. OFF
ON
Disconnect the unit from
power mains prior to
maintenance.
Do not let children operate
the unit.
Do not damage the
power cable while
operating the unit.
Do not put any foreign
objects on the power
cable.
Keep combustible gases
and inammable products
away of the unit.
Do not open the
operating unit.
When the unit generates
unusual sounds, odour or
emits smoke disconnect
it from power supply and
contact the Seller.
In case of continuous
operation of the unit
periodically check the
security of mounting.
Do not block the air duct
when the unit is on.
Do not let air ow from
the unit be directed to
the open ame devices or
candles.
UNIT OPERATION SAFETY PRECAUTIONS

5
VUT 300 E2V EC
PURPOSE
DELIVERY SET
Air handling unit - 1 item
User’s manual - 1 item
Wall-mounted control panel - 1 item
Remote control - 1 item
Duct temperature sensor - 1 item
Packing box - 1 item
Fastening kit - 1 item
The unit is designed to ensure continuous mechanical air exchange in houses, oces, hotels, cafés,
conference halls, and other utility and public spaces as well as to recover the heat energy contained in
the air extracted from the premises to warm up the ltered stream of supply air.
The unit is not intended for organizing ventilation in swimming pools, saunas, greenhouses, summer
gardens, and other spaces with high humidity.
Due to the ability to save heating energy by means of energy recovery, the unit is an important
element of energy-ecient premises.
The unit is a component part and is not designed for stand-alone operation.
It is rated for continuous operation.
Transported air must not contain any ammable or explosive mixtures, evaporation of chemicals,
sticky substances, brous materials, coarse dust, soot and oil particles or environments favourable for
the formation of hazardous substances (toxic substances, dust, pathogenic germs).
Relative humidity of transported air must not exceed 80 % at an ambient temperature of +20 °C.
THE UNIT MAY NOT BE OPERATED BY CHILDREN OR PERSONS WITH REDUCED
PHYSICAL, MENTAL OR SENSORY CAPACITIES, OR LACKING THE APPROPRIATE
TRAINING.
THE UNIT MUST BE INSTALLED AND CONNECTED ONLY BY PROPERLY QUALIFIED
PERSONNEL AFTER THE APPROPRIATE BRIEFING.
THE CHOICE OF UNIT INSTALLATION LOCATION MUST PREVENT UNAUTHORIZED
ACCESS BY UNATTENDED CHILDREN.
INTRODUCTION
This user’s manual includes technical description, operation, installation and mounting guidelines,
technical data for the VENTS VUT 300 E2VEC heat recovery air handling unit, hereinafter referred as
«the unit».

6VUT 300 E2V EC
DESIGNATION KEY
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 %.
In order to prevent condensation on the internal walls of the units, it is necessary that the surface
temperature of the casing is 2-3 °C higher than the dew point temperature of the transported air.
The unit is rated as a Class I electrical appliance.
Hazardous parts access and water ingress protection rating:
IP44 for the unit motors
IP22 for the assembled unit connected to the air ducts.
The main outside and connecting dimensions as well as the appearance and technical parameters of
the unit are given on Figure 1 and in Table 1.
The unit design is constantly being improved, so some models may be slightly dierent from those
ones described in this manual.
VUT 300-X E 2 V EC
Motor type
electronically commutated
Spigot orientation
V - vertical
Air capacity [m3/h]
Spigot diameter [mm]
Unit type
VUT - ventilation with heat recovery
Electric heater
Number of heaters
_ – 150
2 – 160
TECHNICAL DATA

7
VUT 300 E2V EC
Fig. 1. Overall and connecting dimensions
600
697
14
59
260
A1
A
700
H
410 110180
123109
D
10 m cable
Reference dimensions
Model Ø D A A1 H
VUT 300 E2V EC 150 428 373 156
VUT 300-2 E2V EC 160 458 403 186

8VUT 300 E2V EC
Model VUT 300 E2V EC VUT 300-2 E2V EC
Unit voltage [V/50(60) Hz] 1 ~ 230
Maximum fan power [W] 212
Fan current [A] 1.4
Electric heater power [kW] 2 item x 2
Electric heater current [A] 2 item x 8.7
Total unit power [W] 4.21
Maximum unit current [A] 18.8
Maximum air capacity [m3/h] 300
Sound pressure level at 3 m distance [dB(A)] 37
Transported air temperature [°C] from -25 up to +40
Casing material aluzinc
Insulation 20 mm mineral wool
Filter: extract/supply pocket G4/G4 (F7*)
replaceable lter ordering number:
SFK 300 E2V EC G4/SFK 300 E2V EC F7
Connected air ducts diameter [mm] Ø 150 Ø 160
Weight [kg] 38
Heat recovery eciency [%] from 83 up to 95
Heat exchanger type counter-ow
Heat exchanger material polystyrene
*option
Table 1. Unit technical data
Ambient temperature [°C] from 0 up to 40
Relative humidity [%] from 5 to 90 (no condensation)
Cable cross section [mm2] from 0.18 up to 0.35
Material ABS-plastic
Dimensions (WxHxD) [mm] 86 x 86 x 14
Cable length [m] up to 10
Ingress protection IP30
Table 2. Control panel technical data

9
VUT 300 E2V EC
DESIGN AND OPERATING PRINCIPLE
The unit operation is as follows:
Warm extract air from the room ows into the unit and is cleaned in the extract lter. Then the air is
moved through the heat exchanger and is exhausted outside with the extract fan. Cold fresh air from
outside ows into the unit, where it is cleaned in the supply lter. If the supply air temperature is
below the value set from the control panel, supply air pre-heating is provided by the built-in electric
heater. Then the air ows through the heat exchanger and is moved to the room with the supply
fan. The heat exchanger transfers the heat energy of the warm extract air to the cold fresh air from
outdoors. The air ows are fully separated while owing through the heat exchanger. Heat recovery
minimizes heat losses, which reduces the cost of space heating in the cold season.
The air handling unit is equipped with a 2 kW electric heater with overheating protection which provides
supply air pre-heating.
The unit design and operation principle are shown in the Fig. 2.
The basic unit modication includes:
Extract fan
Supply fan
Counter-ow heat exchanger
G4 extract air lter
G4 supply air lter
Drain pan
Drain pipes
Electric heater for air preheating
Electric heater for air post-heating
Supply air temperature duct sensor.
Extract fan Supply fan
Drain pipes Drain pan
Counter-ow heat exchanger
Intake lter
Electric heater
for air preheating
Extract lter
Electric heater
for air post-heating
EXHAUST AIR
INTAKE AIR
EXTRACT AIR SUPPLY AIR
min 1m
Supply air temperature duct sensor
Fig. 2. Unit design and operating logic

10 VUT 300 E2V EC
MOUNTING AND SET-UP
The units are designed for wall mounting.
While installing the unit ensure convenient access for subsequent maintenance and repair.
The mounting surface must be smooth.
Mounting of the unit to an uneven surface can lead to the unit casing distortion and operation
disturbance.
To ensure proper operation of the supply air pre-heating function install a supply air temperature duct
sensor (item 11 on Fig. 2) at the minimum distance of 1 m from the pipe marked «To Indoors».
To install the supply air temperature duct sensor:
drill a Ø 9 mm hole in the air duct;
install the sensor into the hole;
secure the sensor ange with three self-tapping screws.
The sensor and the air duct joint should be additionally sealed.
Fig. 3. Unit mounting
The air handling unit is secured to the wall with anchor bolts (see Fig. 3).
16*
Anchor bolt

11
VUT 300 E2V EC
The wall-mounted control panel is installed as
follows:
Carefully release the latches with a at
screwdriver by inserting it into the access
holes in the lower part of the wall control
panel (Fig. 4).
Remove the service covers.
Disconnect the cable from the terminal block.
Route the cable in the wall to the speed
switch installation site.
Secure the rear panel cover to the wall (Fig. 5).
Connect the cable to the terminal block.
The connection diagram is given on Fig. 5.
Latch the front part of the wall panel in place.
Fig. 4. Rear wall separation
Fig. 5. Securing the rear panel cover to a wall
4
3
1
2
+24V
data2/B
GND
data1/A XT1
222325 24
+24V data2/B GND data1/A
XT4
262729 28
XT8

12 VUT 300 E2V EC
CONDENSATE DRAINAGE
Fig. 6. Condensate drainage
min 3°
min 3°
min 3°
min 100 mm
min 50 mm
DRAIN HOSES U-TRAPS
SEWAGE SYSTEM
min 3°
DRAIN PIPES
The condensate drip pan installed in the heat recovery section is provided with drain pipes.
Connect the drain pipe, the U-trap (not included into the delivery set) and a sewage system with metal,
plastic or rubber drain hoses (Fig. 6). The pipes are required to have a minimum slope of 3°. Fill the system
with water prior to connecting it to power supply! The U-trap must always be lled with water. Provide
free drainage for the condensed water, otherwise it is accumulated inside the unit which may cause the
equipment damage and condensate outow to the room.
The condensate drainage system is designed for normal operation in premises with ambient
temperatures above 0 °C! If the expected ambient air temperatures are below 0 °C the condensate
drainage system must be equipped with heat insulation and pre-heating facilities.
CONNECTION TO POWER MAINS
THE POWER MAINS CONNECTION SHALL ONLY BE PERFORMED BY QUALIFIED PERSONNEL
AFTER CAREFUL READING OF THE USER’S MANUAL.
THE AIR HANDLING UNIT MUST ONLY BE CONNECTED TO AN A/C POWER SOURCE WITH
VOLTAGE OUTPUT AS SPECIFIED IN THE TECHNICAL DATA SHEET. CHECK THE ENTIRE
CABLE LENGTH FOR KINKING. DO NOT SWITCH ON THE UNIT IF THE CABLE IS DAMAGED.

13
VUT 300 E2V EC
The unit is intended for connection to a 230 V / 50 (60) Hz single-phase AC mains with a 3x2.5mm2
cable connected to input terminal block XI of the unit at the factory. The wire strands of the cable are
marked as follows: phase (L), neutral (N) and ground (PE).
The external lead-in (230 V / 50 Hz) must be equipped with a circuit breaker built into the stationary
wiring to disconnect all the mains phases. The position of the QF external automatic circuit breaker must
ensure free access for quick power-o of the unit. The minimum trip current of the automatic cut-out
switch must be 20 A. The cross-section of the cable conductors is 2.5 mm2.
Fig. 7. Unit power connection diagram
1
2
3
N
QF
NPE
ÀN
L
where QF is an automatic circuit breaker
(to be purchased separately);
XI is a terminal block
L
A N
X1
QF
1 2 3
N PE
L N PE
230 V / 50 (60) Hz
The QF external switch location must ensure free access for quick shutdown of the fan. The cross section
of the power conductors is 2.5 mm2.
The unit functionality can be extended by connecting external control devices. The respective contacts
are specied on the label of terminal block X3 (Fig. 8):
- contact PK for connecting an automatic re extinguishing system;
- contact H for connecting a humidity sensor or a CO2sensor;
- contacts Y-N, Y-L and Y-C for connecting a 3-point control damper.
Upon connecting the automatic re extinguishing system contact remove the jumper between
terminals X3:1 and X3:2 of terminal block XЗ. This operation scenario relies on a normally closed dry
contact which interrupts the unit control circuit and de-energises the unit in the event of a re on the
signal sent by the central re extinguishing panel.
Humidity sensor or CO2sensor must be connected to terminals X3:3 and X3:4 of terminal block XЗ.
Upon actuation of the humidity sensor or the CO2sensor the dry contact closes and the unit is set to
maximum speed.
NEVER REMOVE THE PLUG FROM THE POWER RECEPTACLE WITH WET HANDS OR BY
HOLDING ONTO THE ELECTRIC CABLE.
DISCONNECT THE UNIT FROM POWER MAINS PRIOR TO ANY OPERATIONS!
THE RATED ELECTRICAL PARAMETERS OF THE UNIT ARE SHOWN ON THE RATING PLATE.
ANY TAMPERING WITH THE INTERNAL CONNECTIONS IS PROHIBITED AND WILL VOID THE
WARRANTY.

14 VUT 300 E2V EC
The damper actuator must be connected to terminals X3:5, X3:6 and X3:7 of terminal block X3. A
second damper can be connected to the same contacts.
Additional contacts are connected according to the connection diagram (see Fig. 8).The wires run into
the unit through the cable gland in the cover.
Fig. 8. EXTERNAL WIRING DIAGRAM
UNIT CONTROL
Fig. 9. Control panel and remote control
On/O Units
Unit operation mode buttons (see details below)
Fan speed control buttons
Control panel
Remote Controller
Unit On/O
Fan speed up
Heater On
Heater O
Fan speed down
Speed 1 Speed 3
Speed 2
Scheduled
operation On
Timer On/O
Wall-mounted control panel
The unit is controlled from the wall-mounted control panel and the remote control, Fig. 9.
1. Unit On/O
Unit activation/deactivation:
by means of the Unit On/O button from the wall-mounted control panel;
by means of the Unit On/O button from the remote control.
1
2
3
4
"2"
L
L
ÐÊ ÍY-L
Y-C
remove the jumper when connecting
a NC contact to the re extinguishing
system.
Fire alarm
panel
РК H
“1”
“2”
“3”
Y-C
C
L
N
Y-L
X3
1
2
3
4
5 7
6
Y-N
H to the humidity
sensor or CO2LМ24A-TP
Y to external
air damper

15
VUT 300 E2V EC
Fig. 10. 0 - deactivation of the unit
When the unit is o (Fig. 10) the control panel
display indicates:
Room temperature
Day of the week
Time
O mode indication ;
The and indicators glow
in the Heater Cooling mode. Synchronously the
heater cooling countdown is displayed in min: sec.
Fig. 11. Display readings while the unit is ON
When the unit is on (Fig. 11) the control panel
display indicates:
Room temperature
Day of the week
Time
Fan speed status
Timer status information
The . indicator is on when
the timer is enabled. The
indicator is on when the timer is disabled.
Heater status information. The indicator is
glowing when the heater is on.
2. Unit speed control
From wall-mounted control panel: press the button to increase the speed or the button to
reduce the unit speed (Speed 1 – Speed 2 – Speed 3)
From the remote control: press to increase speed or to reduce speed (low speed–medium
speed – high speed).
From the remote control: press to set low speed, to set medium speed and to set high
speed.
The screen of the wall-mounted control panel displays the current fan speed:
indicator on: Speed 1;
indicator on: Speed 2;
indicator on: Speed 3.
3. Electric pre-heating of the supply air.
The supply air is warmed by the electric pre-heater to a pre-set temperature which is determined by the
duct temperature sensor setpoint.
To turn on/o the supply air preheater automatically:
To enable the electric pre-heater press and hold the button on the wall-mounted control panel
and then press the button. The heater activation is conrmed by the indicator on the
screen. To disable the heater press the button again.
From the remote control unit: press the button to enable the heater and then press the
button to disable it.

16 VUT 300 E2V EC
4. Timer.
The timer is designed to switch the fans to maximum speed with subsequent automatic reset to a
previous speed after a set time period, from 20 to -60 minutes.
Turning the timer on/o:
From the wall-mounted control panel: press and hold , then press to turn the timer on. Press
the button once to set the timer for 20 minutes, each subsequent pressing extends the timer setting
for 10 minutes. The maximum timer setting is 60 minutes. Press and hold for 3 seconds to turn
the timer o.
From the remote control: press to turn the timer on for 20 minutes. To turn the timer o switch
o the unit by pressing or .
5. Heat exchanger freezing protection by supply air pre-heater.
If the supply air temperature in the supply air duct upstream of the heat exchanger drops below
the pre-set value (-10 °C by default) the pre-heater is automatically enabled to prevent heat
exchanger freezing.
If the pre-heater is unable to provide sucient cooling at the maximum output and the air duct
temperature upstream of the heat exchanger remains below the pre-set value for 10 minutes the
unit drops the fan speed one step down.
UPON DEACTIVATION OF THE UNIT WITH THE ELECTRIC HEATER ENABLED THE UNIT
CONTINUES TO OPERATE FOR ANOTHER 2 MINUTES TO COOL DOWN THE HEATER. THE
SYMBOL IS DISPLAYED DURING THE HEATER COOLDOWN.
Fan Speed Setting mode.
The unit operates at low, medium or high speed. During the unit setup the capacity of low, medium
and high speed can be continuously adjusted. To enter the Fan Adjustment mode turn the unit o. Then
press and hold on the control panel and hold pressed for 3 seconds.
Access to the Fan Capacity Adjustment mode is conrmed by the and indicators on the
control panel display.
To select the required speed to be adjusted use
and .
When selecting the speed the selected speed is
displayed by the indications , or .
Fig. 12. Fan speed setting
6. Unit parameter settings.
CHANGING THE UNIT SETTINGS RESULTS IN LOSS OF THE FACTORY SETTINGS! FAN AND
TEMPERATURE SENSOR SPEED ADJUSTMENT IS POSSIBLE ONLY FROM THE CONTROL
PANEL!

17
VUT 300 E2V EC
To adjust the supply fan capacity press and
hold and then press to set the fan speed up
or to set it down. Each pressing of and
increases or reduces the supply fan speed by 1%. If
is pressed the display indicators show the current
supply fan speed (Fig. 13).
To adjust the extract fan capacity press and
hold . While holding adjust the fan speed
by pressing for setting speed up and for
setting speed down. Each pressing of and
increases or reduces the extract fan speed by 1%.
If is pressed the display indicators show the
current extract fan speed.
To exit the Fan Speed Setting mode and save the changes press .
Fan speed adjustment is not possible with the remote control.
To restore factory settings enter the Fan Speed Setting mode, synchronously press and hold and
for 3 seconds.
Fan speed factory settings:
Speed 1 – 40 %
Speed 2 – 70 %
Speed 3 – 100 %
Fig. 13. Fan speed setting
Supply air duct temperature sensor adjustment mode.
To enter the supply air temperature duct sensor set-up mode disable the air handling unit and then
press the and the buttons on the control panel simultaneously.
The sensor set-up mode is conrmed by the
and the indicators.
The control panel screen displays the duct
temperature sensor and the freezing protection
sensor settings (see Fig. 14).
Press the button to set the duct sensor
temperature. The temperature value is set
incrementally in the range from +16 °C to +30 °C
range in 2 °C steps.
Press the button to set the freezing
protection sensor temperature. The temperature
setpoint is selected in the range from -20 °C up to
+10 °C.
Fig. 14. Temperature sensor setup
To view the current temperature sensor readings press and hold .

18 VUT 300 E2V EC
Press to view the controller board model
code and software version code on the control
panel display.
To exit the Sensor Adjustment mode press .
Fig. 15. Software version
7. Filter replacement indication.
After 3,000 machine hours the unit control panel screen changes from the operating temperature
display to lter cleaning or change indication (Fig. 16).
Fig. 16. Filter replacement indicator.
When the lter replacement indicator is active
switch o the unit by pressing and disconnect
it from power supply. Then replace the lters. List
of possible alarms is show in the «Technical data»
section on page 19.
Then switch on the unit by pressing on the
wall-mounted control panel or on the remote
control. Then press and simultaneously to
reset the hour meter.
8. Date/time setting.
Turn the unit o.
To enter the Date/Time Setting mode press and hold , then press on the wall-mounted
control panel.
While holding down select the parameter for adjustment by pressing and . The adjusted
parameter is blinking.
The date/time setting parameters are arranged in the following order:
1. Minute
2. Hour
3. Day of the week
4. Date
5. Month
6. Year
Set the desired value of the selected parameter by pressing and on the control panel.
To exit Date/Time Setting mode press .

19
VUT 300 E2V EC
9. Scheduled Operation mode.
Press and hold , then press on the control panel to activate the Scheduled Operation mode.
The indicator lights up when the Scheduled Operation mode is activated.
Press and hold , then press on the control panel to deactivate the Scheduled Operation
mode.
From the remote control the Scheduled Operation mode is activated/deactivated by pressing .
Timer control has higher priority than scheduled operation.
10. Scheduled Operation mode setting.
Each day of the week has four entries. Time of switching the unit to the set speed and turning the
heater on or o can be set for each entry.
To enter the Scheduled Operation mode settings turn the unit o by pressing on the control
panel or on the remote control.
Press and hold on the control panel and the press .
Fig. 17. Scheduled Operation mode setting.
Day of the week
TIME
Entry
number Heater
status
Fan speed
— Heater OFF
— Heater ON
To select the scheduled operation parameters press and hold the button and then select and
set the necessary parameter with the and buttons.
Scheduled operation parameters:
• Entry number – each day of the week has four entries
• Day of the week – setting a day of the week
• Heater status – setting the heater status for the current entry: – heater on, – heater o
• Fan speed – setting the fan speed for the current entry.
• Time – setting time for the current entry.
To copy the set entries for the next day press and hold and press . No copying from Sunday
to Monday is possible.
Press on the control panel or on the remote control to exit the Scheduled Operation
Setting mode.
Scheduled operation programming example is shown in the table. 3. By default, the Scheduled
Operation mode is set for the warm seasons. When selecting this mode for the cold seasons set the
heater status .

20 VUT 300 E2V EC
Day
of the
week
Entry number
1 2 3 4
Start
time Mode Heater status
Start
time Mode Heater status
Start
time Mode Heater status
Start
time Mode Heater status
Mo. 07:00 medium
speed OFF 08:00 rst speed OFF 17:00 medium speed OFF 22:00 rst speed OFF
Tu. 07:00 medium
speed OFF 08:00 rst speed OFF 17:00 medium speed OFF 22:00 rst speed OFF
We. 07:00 medium
speed OFF 08:00 rst speed OFF 17:00 medium speed OFF 22:00 rst speed OFF
Th. 07:00 medium
speed OFF 08:00 rst speed OFF 17:00 medium speed OFF 22:00 rst speed OFF
Fr. 07:00 medium
speed OFF 08:00 rst speed OFF 17:00 medium speed OFF 22:00 rst speed OFF
Sa. 10:00 medium
speed OFF 12:00 medium speed OFF 17:00 medium speed OFF 23:00 rst speed OFF
Su. 10:00 medium
speed OFF 12:00 medium speed OFF 17:00 medium speed OFF 23:00 rst speed OFF
Table 3. Programming example
11. Alarms.
In case of an emergency the air handling unit is disabled while the control panel screen displays the
alarms (Fig. 18). The list of possible alarms is given in Table 4.
Freeze protection
sensor breakout
Duct sensor breakout
TEH overheating
Temperature sensor alarm
ALARM INDICATOR TROUBLESHOOTING
TEH overheating TEH overheating. Contact the
maintenance service.
Temperature sensor
malfunction
Shorting of one or two temperature
sensors. Contact the maintenance service.
Supply air temperature
duct sensor breakout
Contact the maintenance service to
restore the supply air duct temperature
sensor connection.
Freeze protection sensor
breakout
Contact the maintenance service to
restore the freezing protection sensor
connection.
Table 4. Air handling unit alarms
Fig. 18. Alarm indicator