28
VTS reserves the right to implement changes without prior notice
Ventus Air Handling Units
Fig.17.b. Electric connection diagram for circulating humidifier
Electrical connection should be done in accordance to the schemes shown in the fig 17.a. and 17.b.
4.11.3 Electric Heater
Electric heater supply wiring should be let through the fixed panel, at the AHU's back. If the wiring is
led through the inspection panel, on the front side, then it should be arranged so as to enable
opening the section for maintenance and service operations.
Connecting power supply to the heater with control module should be done directly in the heater
section, according to the guidelines of the module operation and maintenance manual. In any other
case connecting power supply should be carried out with a separate switchgear, not supplied with
the VTS package.
Each heating unit of the heater is connected separately to the terminal strip (fig. 18), which is located
sideways of the heating subassembly casing.
Connection of the heater should be done in a way to prevent from possibility of switching on the
heater when the fan is not switched on. What is more, if the fan stops, the heater's power supply
must be turned off as well.
Depending on the automatics system, the heater's power can be adjusted smoothly or gradually. In
order to control the heater gradually, heating units should be arranged with 3 units in a group (fig.
19). Heating units are arranged symmetrically in the heater's window.
Available heater power output depending on the connection type and number of heating units groups
are shown in the table 8.
On the terminal strip there are terminals for connecting the ground cable (PE) and neutral (N) (the
heater's casing must be connected to the neutral or ground cable) as well as terminals 07.08 and 09
