Komfovent C5.1 Manuel D'installation Et D'utilisation page 32

EN
The function of step rotation is provided, when capacities of coolers are
the same.
The number of direct evaporation cooling units must be provided in ad-
vance.
2.7.4. Reversal of direct evaporation coolers
There is a reverse option of direct evaporation coolers, i.e. when the cooler is switched to the heating mode. In
such case, there must be only max 3 cooling control steps. There are control terminals DX3 for connection of
the cooler reversing signal "Heating" (Pic. 1.3 b.).
The option of reversal of direct evaporation cooling units must be pro-
vided in advance.
2.8. 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 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.
2.8 Table. Alarms indicated on the control panel, their possible causes and elimination methods
Message
If unit continuous operation (without breaks) was
Service time 12 months, then periodic inspection message ap-
pears.
Low supply air flow Too high resistance of the ventilation system.
Low extract air flow Too high resistance of the ventilation system.
VAV calibration fail Pressure sensors are not connected or broken.
Change outdoor air filter The fresh air filter is blocked.
Change extract air filter The extract air filter is blocked.
The heater is disconnected due to too low air vol-
Electric heater off
ume.
Temporary mode, which can be activated by the
Service mode
service personnel.
Supply air temperature The supply air temperature sensor is not con-
sensor failure nected or broken.
Extract air temperature The discharged air temperature sensor is not con-
sensor failure nected or broken.
Outdoor air temperature The external air temperature sensor is not con-
sensor failure nected or broken.
Exhaust air temperature The exhaust air temperature sensor is not con-
sensor failure nected or blocked.
Water temperature sensor The water temperature sensor is not connected
failure or broken.
Return water temperature Return water temperature of the heater dropped
low below the permissible limit.
Internal fire alarm Fire danger in the ventilation system.
32
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Possible cause
UAB AMALVA we reserve the right to make changes without prior notice
Elimination
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.
Check pressure pipes, air dampers, air filters and
make sure that the ventilation system is not blocked.
Check pressure pipes, air dampers, air filters and
make sure that the ventilation system is not blocked.
Check connections of the sensor or replace the
sensor.
Shut down the unit and replace the filter.
Shut down the unit and replace the filter.
As soon as the heater cools down, protection re-
sets automatically. It is recommended to increase
the ventilation intensity level.
The service mode is switched off by simply delet-
ing the alert message.
Check connections of the sensor or replace the
sensor.
Check connections of the sensor or replace the
sensor.
Check connections of the sensor or replace the
sensor.
Check connections of the sensor or replace the
sensor.
Check connections of the sensor or replace the
sensor.
Check the status and operation of the circulation
pump, heating system and mixing valve actuator.
Check the ventilation system. Find the source of
the heat.
C5.1-16-03-v1