UAB AMALVA we reserve the right to make changes without prior notice
48
EN
V2-C5-15-03-v1
The purpose of additional zone heater/cooler could be changed from independent to additional control. In such
case this control mode can be used when the air handling unit is equipped with several heaters/coolers of the
same type, or when the standard configuration of the control system does not provide the required demand.
Additional zone control is ordered in advance.
6.13. 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 elec-
trical 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 elimi-
nated 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.
6.13 Table. Alarms indicated on the control panel, their possible causes and elimination methods
Message
Possible cause
Elimination
Service time
If unit continuous operation (without
breaks) was 12 months, then periodic in-
spection 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 exchan-
ger, the heater and fans.
Low supply air flow
Too high resistance of the ventilation sys-
tem.
Check pressure pipes, air dampers, air filters
and make sure that the ventilation system is not
blocked.
Low extract air flow
Too high resistance of the ventilation sys-
tem.
Check pressure pipes, air dampers, air filters
and make sure that the ventilation system is not
blocked.
VAV calibration fail
Pressure sensors are not connected or
broken.
Check connections of the sensor or replace the
sensor.
Change outdoor air filter
The fresh air filter is blocked.
Shut down the unit and replace the filter.
Change extract air filter
The extract air filter is blocked.
Shut down the unit and replace the filter.
Electric heater off
The heater is disconnected due to too low
air volume.
As soon as the heater cools down, protec-
tion resets automatically. It is recommended to
increase the ventilation intensity level.
Service mode
Temporary mode, which can be activated
by the service personnel.
The service mode is switched off by simply delet-
ing the alert message.
Supply air temperature sen-
sor failure
The supply air temperature sensor is not
connected or broken.
Check connections of the sensor or replace the
sensor.
Extract air temperature sen-
sor failure
The discharged air temperature sensor is
not connected or broken.
Check connections of the sensor or replace the
sensor.
Outdoor air temperature
sensor failure
The external air temperature sensor is not
connected or broken.
Check connections of the sensor or replace the
sensor.
Exhaust air temperature
sensor failure
The exhaust air temperature sensor is not
connected or blocked.
Check connections of the sensor or replace the
sensor.
Water temperature sensor
failure
The water temperature sensor is not con-
nected or broken.
Check connections of the sensor or replace the
sensor.
Return water
temperature low
Return water temperature of the heater
dropped below the permissible limit.
Check the status and operation of the circulation
pump, heating system and mixing valve actuator.
Internal fire alarm
Fire danger in the ventilation system.
Check the ventilation system. Find the source of
the heat.
