Komfovent VERSO Pro P, Installation And Maintenance Service Manual

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UAB KOMFOVENT we reserve the right to make changes without prior notice
V-C5.1_21-01
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6.7.6. Pressure auto balance
When this function is ordered for AHU, extract air damper (air extracted from the premises) is
mounted additionally and pressure sensor is installed inside of the C5 controller board. Function main-
tains constant pressure difference between supply and extract airflows inside of AHU, by regulating
damper position. Function ensures that extracted air is not returned to the supply flow through heat
exchanger and increases purge sector (if installed on AHU with rotary heat exchanger) efficiency.
In cases, when AHU cannot reach set extract air flow (for example because of incor-
rectly designed or poorly installed duct system), it is possible, that airflow will be
reduced during operation of pressure auto balance function and too low airflow
alarm will be indicated. It is recommended to reduce airflow set point if such situ-
ation will appear.
This function is active constantly and may only be disabled or changed by a service representative.
6.8. Troubleshooting
If the unit fails to operate:
• Make sure that the unit is connected to the power supply network.
• Check whether the main switch (if designed) is turned on.
• Check all fuses of the automatics. If necessary, replace blown-out fuses with new ones having the
same electrical parameters (the sizes of the fuses are indicated on the schematic electrical diagram).
• Check whether there is any failure message on the control panel. If there is indication, it needs to be
eliminated first. In order to eliminate the failure, follow the table.
• If nothing is indicated on the control panel, check whether cable connecting control panel with the
unit is not damaged.
6.8 Table. Alarms indicated on the control panel, their possible causes and elimination methods
Code Message Possible cause Elimination
14B Service time
If unit continuous operation (without
breaks) was 12 months, then periodic
inspection message appears.
After disconnecting the unit from power supply,
it is necessary to carry out periodic inspection of
the unit, i.e. to check the condition of the heat
exchanger, the heater and fans.
1B, 19A Low supply air flow
Too high resistance of the ventilation
system.
Check pressure pipes, air dampers, air filters
and make sure that the ventilation system is not
blocked.
2B, 20A Low extract air flow
Too high resistance of the ventilation
system.
Check pressure pipes, air dampers, air filters
and make sure that the ventilation system is not
blocked.
3B VAV calibration fail
Pressure sensors are not connected
or broken.
Check connections of the sensor or replace the
sensor.
4B Change outdoor air filter The fresh air filter is blocked. Shut down the unit and replace the filter.
5B Change extract air filter The extract air filter is blocked. Shut down the unit and replace the filter.
6B-11B Electric heater off
The heater is disconnected due to too
low air volume.
As soon as the heater cools down, protection
resets automatically. It is recommended to
increase the ventilation intensity level.
113B,114B
CF exchanger not
calibrated
CF exchanger calibration not per-
formed or failed
Make sure that all doors are closed, there is no
obstructions in the ducts and AHU can reached
airflow setpoint of COMFORT 1 mode. Repeat
calibration manually (see 6.5.1.3).
127B Service mode
Temporary mode, which can be acti-
vated by the service personnel.
The service mode is switched off by simply delet-
ing the alert message.
1A, 2A
Supply air temperature
sensor failure
The supply air temperature sensor is
not connected or broken.
Check connections of the sensor or replace the
sensor.
3A, 4A
Extract air temperature
sensor failure
The discharged air temperature sen-
sor is not connected or broken.
Check connections of the sensor or replace the
sensor.