Operation and Maintenance Manual, OnyX Sky Heat Recovery Units, 2022/01
Frapol Sp. z o.o. reserves the right to introduce changes without any prior notice.
Page
63
•
Type of cooler
–
activate or deactivate the cooler operation. DX or water cooler is supported.
•
Cooler disable time
–
the time, during which the cooler cannot start after opening the bypass.
•
Cooler disable temperature
–
the DX pump-motor unit control can be configured depending on the external
temperature. This function makes the operation of the pump-motor unit independent of heat recovery settings
with the possibility to set the disabling time of the pump-motor unit after recording the temperature drop at
the air intake.
•
Extraction bypass support
–
activate or deactivate the operation of bypass damper 2 during the process of air
control and recovery.
•
Configuration of potential-free contacts
–
settings related to the assignment of functions to potential-free
contacts.
Available sensors:
-
Reserves 1, 2, 3
–
selection of the function assigned to the “Reserve 1, 2, 3” contact
-
Cooling demand threshold
–
settings of the cooling demand threshold below which the relay is not activated.
-
Heating demand threshold
–
settings of the heating demand threshold, below which the relay is not activated.
-
Air intake threshold for Reserve 2
–
below this temperature at the air intake, the Reserve 2 outlet will be
activated.
•
Reheater activation threshold
–
temperature value downstream of the heat exchanger, below which the
reheater is activated.
•
Reheater deactivation hysteresis
–
temperature difference for the reheater deactivation, when the temperature
downstream of the heat exchanger rises above the
reheater activation threshold
.
•
Reheater control signal rise rate
–
the rise rate of the control signal of the reheater per second when heating.
•
Primary air heater operation
–
activation or deactivation of the primary air heater operation (electric or water
heater).
•
Mixing box
–
Activation or deactivation of the mixing box, which enables the mixing of two air flows: cool fresh
air and hot recirculation air. After mixing, the stream with the resulting temperature is heated by the heaters.
Thanks to this, the necessary amount of the fresh air after filtration and the air heated to the set temperature
enters the room. Activation of the operation will result in an additional parameter
Mixing box settings,
at which the following functions are available:
-
Minimum control signal of the mixing box
–
setting the minimum control signal for the mixing box, below
which the control algorithm will not operate.
-
Maximum control signal of the mixing box
–
setting the maximum control signal for the mixing box, above
which the control algorithm will not operate.
•
SM1
damper operation
–
activation or deactivation of the SM1 damper operation (located between the duct
that connects the air supply and air exhaust).
•
The actuators of the dampers used should be controlled on an ON-OFF basis, which corresponds to the position
of the damper in the Open-Close position.
NOTE
It is recommended to use a damper with an actuator on the inlet side which will cut off air flow when the
controller is switched off.
The method of connecting damper actuators to the controller terminals is shown in the wiring diagram.
Hardware configuration of HRU inputs
Setting the configuration related to the HRU inputs.
•
Air
quality
sensor
–
activation or deactivation of the air quality sensor. The supported sensors include: the
CO
2
analogue
sensor
which
allows for controlling the CO
2
concentration in rooms, the
Analogue humidity sensor
which allows for controlling the level of humidity in rooms, and
the Digital binary sensor
.
NOTE
The transfer of the moisture from the exhaust air to the usually dry supply air is possible only with an HRU
equipped with a rotary heat exchanger or periodic heat exchanger.
The connection of the CO
2
and humidity sensors must be carried out according to the wiring diagram.
•
Heaters
thermostats
–
settings related to the thermostats of the primary air heaters and reheaters. Determine
the rest status for the thermostat contact corresponding to the heater in use, and set the
Primary air heater
thermostat
and
reheater thermostat
parameters to
Normally Open
or
Normally
Closed
.
•
Settings for R1/R2 inputs
–
settings related to the operation of the R1/R2 digital inputs.
The settings related to the operation of digital inputs to change the air flow demand for fans in the constant control
mode are made in the
Hood
mode
settings
parameter group.
•
Hood
mode
support
–
activation and deactivation of the control corresponding to changing the demand for air
flow, based on the readings of signals from the R1 and R2 digital inputs.
