UAB KOMFOVENT we reserve the right to make changes without prior notice
V-C5.1_21-01
46
EN
6.7.2. Multi-level control of direct evaporation cooler
For air cooling in the air handling unit there is provided 3 control contacts (connection is shown in
Picture 5.3 b). Depending on how much will be cooling steps and how it will be divided on steps, auto-
matically will be selected optimal control method. If the capacity of all steps is the same, then only three
control steps are possible. If cooling capacities of steps are close to ratio 1-2-4 (the capacity of each of
the following steps is double the previous), then cooler control will be realized with seven cooling steps.
Example: To the terminals DX1 is connected 1kW cooler, to DX2 – 2kW and to terminals DX3 con-
nected cooler with 4kW capacity. Control will be in steps:
1: 1kW; 2: 2kW; 3: 1kW+2kW; 4: 4kW; 5: 1kW+4kW; 6: 2kW+4kW; 7: 1kW+2kW+4kW.
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 advance.
6.7.3. Reversal of direct evaporation coolers
There is a reverse option of direct evaporation coolers, i.e. when the cooler is switched to the heat-
ing 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. 5.3 b.).
The option of reversal of direct evaporation cooling units must be provided in ad-
vance.
6.7.4. Inverter direct evaporation cooler control
There is an inverter unit control which power can be managed smoothly. For the inverter unit power
control, there is a modulated signal (TG2), as well as signals: cooler start (DX1), cooling demand DX2,
heating demand DX3 (see Pic. 5.3 b).
There are three different control methods:
1. Universal control, suitable for most cooler units.
2. Control adapted to Panasonic cooler units.
3. Control adapted to Daikin cooler units.
The inverter cooling unit controls should be provided in advance.
6.7.5. Additional zone control
By connecting the additional extension module
to the air handling unit, the supply air temperature is
maintained in a separate ventilated area (room), i.e.
the module has the option to independently control
additional heaters and coolers. In this case, the user
can have a separate temperature setting for the par-
ticular area:
There is a possibility to control up to 2 additional
areas (two additional extension modules).
Detailed information is presented in the additional zone installation manual.
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.
Reset settings
Enable
Setpoint
21.0 °C
1st additional zone control
Functions
2 / 2
Overide function
1st additional zone
control
2nd additional zone
control
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