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Unit Activation
Unit Activation
n
Check the correct interconnection of the control unit and
air-handling unit. Check the motors (frequency inverters) -
power part, controls, dampers, filter pressure sensors, motors,
sensors... - in accordance with the air-handling unit.
n
Check the locations of the sensors, check the mechanical
parts (dampers, motors) for free rotation and sticking.
n
Fan pressure and differential pressure sensing hoses must
be situated so that they will sense static pressure (the end of
the hose must not be oriented against the air flow. It must
be oriented perpendicularly or in the direction of the air flow).
n
Verify the settings of the pressure difference sensors
n
Adjust the end pressure drop value on the filters according
to the manufacturer's label
n
Check the values on the heat recovery unit (values also
provided on the manufacturer's label, derived from the op-
erational pressure drop of the heat exchanger).
n
If everything is in order, energize the switchboard and leave
it in the STOP state.
Unicon Air Flow Sensor Settings
n
Sensor operation (Mode) – set to 5.00
n
Adjust measuring range in Pa (in accordance with max.
pressure of the fan).
n
Set the K-factor according to the type of impeller specified
in the project data for the fan from the design software, or
refer to the manufacturing label of the fan section.
n
To ensure stepless air-flow control using the Unicon sensor
and to prevent the fan output cycling, we recommend setting
the frequency inverter start-up and run-down ramps to 180
s (Danfoss frequency inverter –parameters 3-41 and 3-42).
n
If the system is equipped with a PLC controller for control-
ling the performance of the integrated cooling compressors in
the air handling unit, or for controlling the electronic expansion
valve, it is necessary to follow the instructions provided by the
manufacturer of the integrated cooling module during opera-
tion. It is particularly important to check and resolve any fault
notifications as specified in the manufacturer's instructions.
n
The controller has already been set and the parameters
need not be adjusted, with only some exceptions.
n
Now it is possible to switch the unit to RUN mode (see
chapter 4.1 Main Switch).
n
Check the fan current consumption in each operating
mode. If higher than Imax (see motor rating plate), it must
be decreased (e.g. by decreasing the max. frequency of the
frequency inverter).
Current Date and Time Settings
According to the customer's requirements, set the desired
temperature and humidity at full operating mode (e.g. 31°C,
50%) and at reduced operating mode (e.g. 28°C, 70%). It is
also necessary to set the time schedule for full operating mode
(time of swimming pool use, e.g. 9.00-20.00 h).
Outside this time, the unit is operated in reduced operating
mode. If the air-handling unit is equipped with the Unicon
constant air flow sensor, set this required air flow in the Carel
controller menu. The swimming-pool unit should be constantly
in operation, except for service and maintenance periods.
The system is filled with a calculated quantity of coolant in
the factory.
64
Checks
Temperature Difference Monitoring
This enables the difference between the required and actual
supply air or room temperature to be monitored. The moni-
tored temperature is compared with the pre-set tolerance ±°C
while simultaneously monitoring the temperature drop below
the minimum limit. If the monitored temperature is below the
minimum limit or outside the permissible tolerance for more
than 1 hour, an informative error will be activated. The optional
temperature difference monitoring can be enabled using the
HMI controller, refer to the chapter Additional Operating
Modes and Function Setting Options. Temperature minimum
limit or tolerance can be set using the HMI controller in the
List of Data Points in the section Monitored temperature
Check Settings, System and Network Setting – Difference
Monitoring.
Failures
The VCS unit monitors, evaluates and informs about various
types of system failures. Possible failures are indicated, see
the chapter of appropriate HMI controller (SG, TM, DM or
Web) or Remote Indication. Failure messages identify failed
objects/components which need to be inspected, respec-
tively to find and remove the cause of the failure (or confirm
absence of any problem) before acknowledging the failure.
For failure reset, refer to the chapters of HMI controllers.
Failure Inputs (digital)
All important air-handling unit components (fan motors, elec-
tric heaters, etc.) are equipped with failure inputs (contacts)
which after being connected to the devoted inputs (terminals)
are evaluated by the VCS unit, respectively by the controller. If a
failure (incorrect state of the contact) occurs, the VCS control
unit will automatically put out an alarm in accordance with an
internal algorithm – indicating the faulty object and in case of
severe failures stopping the air-handling unit.
Note: In the Stop mode (at the beginning of start-up) the state
of the air-flow sensors is indicated as correct. However, it is
actually a failure state (contacts open) which, in these situa-
tions, is not evaluated by the system as a failure (this evalua-
tion is performed once a pre-set time has elapsed). Similarly,
the filter fouling sensor in the Stop mode – without air flow
rate – is put into standby mode (contacts closed) which does
not correspond with a failure state even though a failure oc-
curred and was indicated during the previous operation (this
state will change once the devise has been started up – if the
filter has not been changed).
Temperature Sensor Failures
Information about temperature sensors are specific failure
messages evaluating their state outside the standard work-
ing range of measured temperatures. The controller will
automatically report a disconnected, open or short-circuited
temperature sensor, respectively abnormal value. If the main
control sensors (e.g. supply air temperature sensor) or pro-
tection sensors (antifreeze protection) fail, the controller will
shut down the system.
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