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VEX340: Control system

EXact control system - List of functions

Function / component Description

 Standard

 Accessory

Filter monitor Pressure sensors for monitoring the pressure drop across the lters – alarm for a

fall more than the value set and "Early Warnings"



Bypass In the case of modulating bypass of extract air, the heat recovery is reduced to

maintain the desired supply air temperature



Temperature sensors 1) In the extract air spigot to measure/control room temperature

2) In the exhaust air spigot to measure exhaust air temperature

3) In the outdoor air spigot for outdoor air temperature compensation and

night-time cooling

4) In the supply air spigot to measure/control supply air temperature

5) Duct temperature sensor

6) Room temperature sensor





Overheating protection If there is a danger of the motors or frequency converters overheating the unit will

shut off – manual reset.



Fire alarm Fire thermostats (40/50/70°C), smoke detector and other re detection switches

can be connected. In the case of a tripped re alarm, the unit’s functions are adjustable



Closing damper, outdoor air

(requirement for water

heating coil)

The damper is tted in the outdoor air duct – it shuts when the unit stops –

available with a spring-return motor



(



)

Closing damper, exhaust air The damper is tted in the exhaust air duct – it shuts when the unit stops – available

with spring-return motor



Regulating temperature Regulation of the supply air temperature

Regulation of the room temperature



Compensation functions Outdoor air temperature compensation

Airow reduction

Outdoor airow compensation

Summertime compensation

compensation

Humidity compensation



Night-time cooling The unit can be set to start at night to cool the building



Frost protection Automatic energy-saving feature for preventing icing in the counter ow heat

exchanger



Control panel Panel for operation at user, technician and specialist level



Weekly clock For setting the times required for changes between indoor air quality levels



Bus communication Modbus RTU

Modbus TCP/IP

LONWORKS





Web server Integrated web server allowing control and monitoring over the internet.



Cooling recovery On-demand cold recovery



Constant pressure regulation Possible for both extract and supply air



Motion sensor (PIR) For automatic control of indoor air quality level



Airow measurement Airow shown in control panel



Indoor air quality levels Timer-controlled (comfort, standby, economy, off)

Manual



Alarm log Displays the last 100 alarms



Timers Supply air motor, extract air motor motor



Alarm relay Relay for external alarm



The table below describes the control system functions. More detailed descriptions of selected functions are shown on the following pages.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 23 24

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