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UAB KOMFOVENT we reserve the right to make changes without prior notice
DOMEKT_C8_guide_21-07
EN
Special frost protection mode changes the balance of airflows, which may lead to pressure diffe-
rences indoors, therefore, this mode is not recommended in airtight buildings (A+ or higher energy
efficiency class) or in houses with a fireplace.
External pre-heater
–
pre-heater, installed inside an outdoor air duct, upstream the air-handling unit, is switched on as
soon as the heat exchanger freezing conditions occur. Efficiency of a heater depends on the outside air temperature, indoor
humidity and actual flow of ventilated air. Integrated pre-heater operates only on demand to protect the heat exchanger
against freezing. Under very low indoor humidity conditions, it is unlikely that the heat exchanger would freeze even at very
low outdoor temperatures. To ensure proper operation of the pre-heater, a control panel or a separate humidity sensor must
be installed in the ventilated premises (see “Installation Manual”).
When using the pre-heater, other duct mounted heating or cooling devices cannot be connected.
• Indoor humidity
– this setting is necessary for estimating power of a pre-heater.
Possible settings:
Auto
– indoor humidity is set automatically using an integrated in the control panel humidity sensor and/or external
humidity sensor connected to B8 terminal of the controller (see “Installation Manual”).
10...90 %
– setting a fixed indoor humidity value is possible when a control panel is installed in inappropriate location (or
is not used) and no outside humidity sensors are connected.
Control sequence
1
/ 2
Stage 1
Electric heater
Stage 2
External coil
Stage 3
None
External coil type
Cold water
Icing protection
On
Icing protection
Standard
Special
External heater
2
/ 2
Control sequence
Indoor humidity
Auto
Allow dehumidifying with cooling
Off
Indoor humidity
Auto
10 %RH
90 %RH
Wrong value of indoor humidity may cause antifreeze protection to malfunction and a counter-flow
heat exchanger to freeze.
• Allow dehumidification with cooling
–this setting must be enabled to use a DX unit or duct-mounted water cooler to
dehumidify the supply air. An option to enter a value for desired humidity will appear in the settings of standard ventila-
tion modes (see Chapter 2.5.2).
Connectivity
– you can configure
your PC network settings for remote use
via web browser: IP address and subnet
mask. You may also change other net-
work parameters, if necessary: Gateway
and BACnet ID. DHCP option automati-
cally assigns a free IP address in the lo-
cal network (do not use this option if
you connect your computer directly to
the unit).
„Status“ line shows connection be-
tween AHU and internet:
• Disconnected
– AHU is not connect-
ed to LAN or internet network.
• No internet access
– AHU is connected to LAN network and communicates with router, but internet is not accessible.
• Connected
– AHU has internet access.
Connectivity
IP address
192. 168. 0. 60
Subnet mask
255. 255. 0. 0
Gateway
192. 168. 0. 1
Status
Connected
DHCP
1
/ 2
Modbus RTU
Panel
Fire dampers
Modbus
Connectivity
2
/ 2
Modbus RTU
Modbus
BACnet ID
60
BACnet Port
47808
Modbus ID
254
RS-485
19200 8E1
