Hoval RoofVent CON-9, Design Handbook

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296
Type: 2K
Cooling in the 4-pipe system
There is a separate coil for heating and for cooling. The
DigiNet system is switched between heating and cooling
automatically. Two switch relays and the additional terminals
for enable cooling and the trouble input cooling are installed
in the zone control panel.
Type: 4K
Room temperature average value
Instead of only 1 room air sensor, 4 sensors are provided to
determine the average value; the corresponding terminals
are integrated.
Type: MRT
DigiPlus controller
The DigiPlus controller is installed in the zone control panel
in addition to the DigiZone controller. It enables the following
additional functions:
■ Humidity control: Depending on the relative humidity of
the room air, DigiNet gives an output signal (DC 0…10 V)
to control humidity equipment. (Required: humidity sensor,
built-in humidity equipment)
■ Ventilation according to requirements: The speed of
the fans and therefore the air change speed is varied
according to the CO
2
concentration in the room.
(Required: Fans with variable volume flow, CO
2
sensor)
■ External control of volume flow: Fans with a variable
volume flow (option) can be controlled by an external
signal (DC 0...10 V).
■ Cascading electro coils: The DigiPlus controller switches
up to three 2-level electro coils for each control zone
depending on the analog heating valve output.
Type: DP5
Humidity sensor
The sensor measures the relative humidity in the room air as
a basis for humidity control. It is installed on the wall in the
occupied area, at a height of about 1.5 m.
Type FF
Measurement range 0…100 %
Output signal DC 0…10 V
Table L19: Technical data for the humidity sensor
CO
2
sensor
The sensor measures the CO
2
concentration in the room air
as a basis for ventilation as required. It is installed on the
wall in the occupied area, at a height of about 1.5 m.
Type CO
2
Measurement range 0…2000 ppm
Output signal DC 0…10 V
Table L20: Technical data for the CO
2
sensor
Base for the zone control panel
Zone control panels in sizes 7 to 9 are available with a sheet
steel base, height 200 mm.
Type: SO
Control systems
Options