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  1. EXHAUSTO
  2. Products
  3. Rotary units
  4. VEX200EC (EXact2)
  5. Control system VEX200

EXact2 control system VEX200

General

EXact2 control system

Behind the simple operating panel, the advanced EXact2 control system ensures optimum operating economy. The control system is easily matched to the daily rhythms of the user location, e.g. school, office or home.

EXact2 control system features

- Simple operation
- Three user modes, two with access codes (technician and specialist)
- Several indoor climate levels and a built-in weekly timer allows on-demand ventilation
- See more selected functions in the function overview.

Operation of the control system

The EXact2 control system can be operated from the control panel (see section "HMI control panel" below), BMS or a web server via a network or WAP (Wireless Access Point).

Wireless Access Point (WAP)

WAP is a small WIFI router mounted inside the control system in the unit. It allows the web server to be accessed wirelessly via PC, smartphone or tablet, so the unit can be configured quickly and easily via mobile platforms.

HMI control panel

EXact2

HMI2-350-TOUCH control panel

The control panel is a touch panel that provides access to the standard daily operating interface.

Technicians and specialists can access the more advanced menus and parameters via a 4-digit password.

User interface

HMI-for-EXact2-automatik

The user menu is for daily operations. It shows visual symbols to indicate the unit's status and provide information.

The interface allows the user to temporarily change the temperature and ventilation level.

The very useful help texts displayed in the yellow area minimise the need for manuals and instructions. Help texts are available  in both technician and specialist modes.

Alarms are shown by a bell in the display. You can click on from here to get information about the specific alarm.

 
The help texts can be found under the menu items in the technician and specialist menus.

Display icons

Display information is much easier to understand because of the simple graphical elements.

menu-ikon-til-HMI2-350Touch

Menu
Press to view menu
   
Temperature/ventilation level
Temperature and ventilation levels can easily and quickly be changed temporarily. Set points are shown together with visual symbols in the display.
   
alarm og advarsel Alarm/warning
The EXact2 control system will generate a warning symbol if it detects operational disturbances. The display will show an alarm bell if more serious disturbances have been detected.
   
EXact ekstern stop External stop
If the ventilation system has been stopped by an external start/stop signal, this symbol will appear in the display.
   
EXact manuel Manual operation
The EXact control system can be operated in manual mode. When operating in manual mode, the hand symbol will appear in the display.
 
Ugeplan tom Weekly plan
When operating with the weekly plan activated, the clock symbol will appear in the display.
part of weekplan lewels
 
EXact overstyring Override
When temperature and ventilation level set points are changed, the override symbol will appear in the display while the settings are overridden by the next change in the weekly plan.
 
BMS BMS
BMS-controlled operation.
 
AUX AUX
Externally-controlled operation.
 
EXact sommer vinter Summer/winter
The Exact2 control system automatically changes from summer time to winter time. The symbol indicates either summer time or winter time.
 
Fire-exact2-ikon
 Fire
Fire thermostat(s)/smoke detector activated
 
service Service
Service display connected.
 
Disconnect Disconnect
No communication on the external BUS or communication between the VEX and HMI is disconnected.
External communication

Web server

The EXact2 control system is supplied as standard without Web server. Purchase of the Web server gives access to the following additional features:

  1. The unit can be monitored and configured using a local PC.
  2. The unit can be connected to a local area network (LAN) and controlled by a PC connected to the LAN.
  3. The unit can be connected to the internet and controlled by external PCs.

The only requirement is that the connected PC has a browser The Web server is password protected.

The Web server user interface is designed in the same logical fashion as the control panel. Uniformity makes the system easy to use. The overview display is configured and ready to monitor the ventilation system. The Web server can send an email in the event of an alarm, log data, etc.

Connection to BMS unit

As standard, the Web server can communicate with Modbus RTU RS485, BACnet MSTP or BACnet IP. Thus, a BMS unit that uses one of these communication platforms can be easily connected to the unit.

webserver illustration

 

Converting to other protocols

Via the Web server, the units can be connected to other BMS units with other protocols via a converter (gateway). If the converter has been purchased, the following options are available:

1.    MLON - Module for converting to LON
2.    MTCP - Module for converting to Modbus TCP/IP

LON illustration

 

Try the EXact2 control system online

Try out the EXact2 control system online and control a VEX340 unit installed at EXHAUSTO in Langeskov.

This unit is free-standing and without duct system connections.

The control system is accessible at http://exact.exhausto.dk:8340/

For technician mode use the following:

User name: VEX340
Access code: 1111

NB Only one user can be logged in at a time.

Functional overview of air handling units

VEX200

Function / component Description +Standard

-Accessory 
Filter monitor Pressure sensors for monitoring pressure drops over filters - alarm at pressure drops higher than set value and "Early Warnings"  +
Regulation of rotor rotation The rotor's RPMs are regulated according to the desired supply air temperature, so that it is maintained in spring, summer and fall, when there is no need for full heat recovery. + 
Temperature sensors









 1) In the extract air spigot for measuring/control of room temperature +
2) In the exhaust air spigot for measuring exhaust temperature +
3) In the outdoor air spigot for outdoor temperature compensation and night time cooling +
4) In the supply air spigot for measurement/control of the supply air temperature +
5) Duct temperature sensor -
6) Room temperature sensor -
Overheating fuse When there is danger of overheating motors and motor controls the system will be shut down and reset manually +
Fire alarm Fire thermostats (40/50/70 °C), smoke detectors and other fire alarm switches can be connected.

The function of the air handling unit is adjustable when a fire alarm is activated		 -
Closing damper- outdoor air

(required with a water heating coil)		 Damper mounted in outdoor air duct - closes at system shut-down - can be supplied with a spring-return motor -

(+)
Closing damper - exhaust air Damper mounted in exhaust air duct - closes at system shut-down - can be supplied with a spring-return motor -
Temperature adjustment

 Adjustment of supply air temperature +
Adjustment of room temperature +

 

 

Function / component Description +Standard

-accessory
Compensating functions









 Outdoor temperature compensation +
  Airflow reduction +
Outdoor compensation of airflow +
Summer compensation +
CO2-compensation -
Moisture compensation -
Night cooling The installation can be set to start at night to cool the building +
Control panel Panel for operating at user, engineer and specialist levels +
Weekly schedule For setting the desired times for changes between indoor climate levels +
Webserver Webserver with the possibility for control and monitoring, Modbus RTU RS485, BACnet MSTP, BACnet IP

 -
Bus communication

(requires webserver)		 Modbus TCP/IP -
LONWORKS -
Cooling recovery Cooling recovery when needed +
Constant pressure adjustment Possible from both the extract air side and supply air side -
Motion sensor (PIR) For automatic adjustment of indoor climate levels -
Airflow measurement Airflow level is shown on control panel +
Indoor climate levels

 Timer controlled (comfort, standby, economy, off) +
Manual +
Trim damper for

purging		 Manual trim damper

(TB240/250/260/270/280)		 -
Alarm log Shows the latest 100 alarms +
Hour counters Supply air motor and extract air motor +
Alarm relay Relay for external alarm (potential free) +
Heating coils function overview

EXact2

HCW - External water heating coil

Function/component Description
Temperature sensors 1) In the supply air duct to measure/control supply air temperature
2) On the return pipe from the water heating coil to keep the heating coil warm and protect it from icing
3) To protect icing of the external pipe for the heating coil (accessory)
4) Temperature sensor on water heating coil supply pipe
Modulating motor valve Valve for variably regulating the flow of water to the heating coil, depending on the heat requirement
Circulation pump control

 1) Control the circulation pump for the water heating coil
2) Heat retention function (keeps heating coil free of ice)
3) Built-in control to run the circulation pump during periods when heating is not required

 

HCE - External heating coil

Function/component Description
Temperature sensors  In the supply air duct to measure/control supply air temperature
Overheating protection

 1) TSA60 is located on the circuit board, trips at 60°C and has manual reset on the HMI
2) TSA70 is situated in the airflow, trips at 70°C and has manual reset
3) TSA120 is located in the airflow, trips at 120°C and has manual reset in the heating coil and on the HMI


MXHP - Control module for external cool/heat pump units

Function/component
 Description
Temperature sensors
 In the supply air duct to measure supply air temperature
Control

Control of external cool/heat pump units via

  • start/stop indicator
  • cool/warm indictor
  • on-demand regulation 0-10 V (10-0 V)
Cooling function overview

EXact2

CCW - External cooling coil

Function/component Description
Temperature sensors
 1) In the supply air duct to measure supply air temperature
2) In the supply water pipe for the cooling coil
Modulating motor valve Valve for variably regulating the flow of water to the cooling coil, depending on the cooling requirement
Circulation pump control
 1) Control the circulation pump for the cooling coil
2) Built-in motion control of the circulation pump for periods that do not require cooling 

MXCU - Control module for external cooling units

Function/component Description
Temperature sensors
 In the supply air duct to measure supply air temperature
Control

Control of external cooling unit  via

  • start/stop indicator
  • on-demand regulation 0-10 V (10-0 V)


MXHP - Control module for external cool/heat pump units

Function/component
 Description
Temperature sensors
 In the supply air duct to measure supply air temperature
Control

Control of external cool/heat pump units via

  • start/stop indicator
  • cool/warm indictor
  • on-demand regulation 0-10 V (10-0 V)
Simplified diagram

VEX200

VEX200 with EXact control system

- with after heating coil (HCW/HCE). Cooling coil (CCW) and without heating coil

The simplified drawings show components that can be included in a VEX200 air handling unit.

VEX200EC Diagram Simplified



With EXact2, HCW can either be connected directly to the main PCB or via the MHCW module as shown here. If the distance between the unit and the HCW is less than 10 m, the connection can be made directly on the main PCB.

 

Standard and accessory components

The VEX340H is supplied with a number of components fitted to the unit or for fitting in the duct system and the premises. In the following table, the standard and accessory components for the VEX200 are specified. Accessories must be ordered separately.

Abbreviation Description + = Standard   - = accessory
BP1 Damper, bypass +
BP2 Damper, bypass +
BT40-70 Safety-limit thermostat, stepless setting
 -
HMI Control panel +
LS Closing damper, exhaust air -
LS Closing damper, outdoor air

(required and a part of the delivery with water heating coils)		 -

(+)
LSR Closing damper, exhaust/outdoor air (spring-return) -
M1 Fan motor 1 +
M2 Fan motor 2 +
MC1 Motor control 1  +
MC2 Motor control 2  +
MCCW Cooling Coil Water control system -
MHCE Electrical heating coil control system -
MHCW Heating Coil Water control system -
IHCW Internal controller for HCW - see above  +
MIO-CO2-DUCT CO2-sensor, duct -
MIO-CO2-ROOM CO2-sensor, room -
MIO-PIR PIR-sensor -
MIO-RH-ROOM Moisture sensor (RH) -
MIO-TS-DUCT Temperature sensor, extract air duct (external) -
MIO-TS-ROOM Temperature sensor, room -
MPT-DUCT Pressure sensor for constant pressure adjustment -
MPT1, P1 Airflow control, extract air +
MPT1, P2 Filter monitor extract air +
MPT2, P1 Airflow control, supply air +
MPT2, P2 Filter monitor outside air +
MVM Motor valve, water heating coil (HCW) -
MXHP  Control module for external cool/heat pump units  - 
MXCU  Control module for external cooling units
 -
DRHX Rotor control  + 
BUZZ ALARM Alarm relay +
TE1,1 Temperature sensor, extract air - spigot 1,1 +
TE1,2 Temperature sensor, exhaust - spigot 1,2 +
TE2,1 Temperature sensor, outside air- spigot 2,1 +
TE2,2 Temperature sensor, supply air- spigot 2,2 +
TE-RPT Temperature sensor, return pipe from water heating coil (HCW) +
TE-SPT Temperature sensor supply +
TS-RPT-X Temperature sensor, return, external pipes (HCW) -
TSA 60/70/120 Overheating thermostat, 60, 70 and 120 respectively °C -
Cable dimensioning

VEX200

The electrician installing the unit is responsible for ensuring that all sizes used are compatible with current legislation and regulations. The VEX200 series heat recovery units have a built-in isolation switch and automatic fuses which safeguard the air handling units internally against overload and short-circuit.

The HCE after heating coil has a built-in isolation switch and the control system has short-circuit protection. In the HCE, internal cables and heating elements have short-circuit protection via a fuse in the distribution board (not supplied by EXHAUSTO).

Maximum short circuit current (lcu), in accordance with EN60947.2 is 10 kA.

Maximum fuse rating is 63 A and G/gl.

Accessory types MHCW, MCCW, MXCU and CP do not require separate supply cables and can be connected directly to the control system box of the VEX200. Terminals (U1, N) may only be used with the above mentioned accessories, and can have a 2 A maximum load. A maximum of 1 MHCW (after-heating) and 1 MCCW/MXCU (cool) may be connected. The EXact2 control ensures that after heat and cooling can not operate at the same time. HCE-type accessories must have a separate power supply.

Maximum phase current is the dimensioned current for choice of cable. Cable should be dimensioned according to maximum neutral current if this is greater than the maximum phase current.

Equalising connections

Equalising connections must be established between the VEX and HCE types of accessories (or after heat).

Fitting of fault current breakers

If fault current breakers are fitted to the installation, these must be of a type which comply with the following requirements:

a) VEX240 / VEX250 / VEX260:
PFI-breaker type A in compliance with EN61008, which disconnects when fault currents are detected with DC content (pulsating DC)
b)  VEX270:
PFI type B breaker in compliance with EN 61008, which breaks the circuit when a fault current with DC content (pulsating DC) or smooth fault currents is registered.
c) maximum break time must be 0.3 sec.

The current leakage can be up to 100 mA.

Automatic cut-out built into the VEX200 

VEX... 240 250 260 270
Voltage (V) 1 x 230 V + N + PE

3 x 400 V + N + PE
Fuse for control system

(1 x 230 V) 2 pol		 C-10 A C-10 A  C-10 A  C-10 A
Fuse for MC1

(1 x 230 V) 2 pol		 C-10 A C-10 A  C-16 A  
Fuse for MC2

(1 x 230V) 2 pol		 C-10 A C-10 A  C-16 A  
Common fuse

for MC1 og MC2

(3 x 400 V) 3 pol		        C-20 A
Total number of fuses 3 3  3  2

MC = Motor controller

Cable plan - accessories

Connection box


Abbreviation Designation
ALARM Alarm relay
BT40-70 Safety-limit thermostat, stepless setting 
HMI Control panel
LS Closing damper, exhaust air
LS Closing damper, outdoor air (required and supplied with water heating coil) 
LSR Closing damper, exhaust/outdoor air (spring return)
MCCW Cooling coil, (Cooling Coil Water), control system
MHCE Electric heating coil (Heating Coil Electric), control system
MHCW Water heating coil (Heating Coil Water), control system
MIO-CO2 CO2 sensor
MIO-PIR PIR sensor
MIO-RH Humidity sensor (RH)
MIO-TS Temperature sensor
MPT-DUCT Pressure sensor for constant pressure regulation
MXHP  Control module for external cool/heat pump units 
MXCU Control module for external cooling units
Smoke detector Smoke detector

Wiring diagram - coils

VEX200

VEX200 with external after heating coil - Water (HCW) / cooling coil (CCW)

VEX200EC_HCW_Cable Plan

 

 

Size Voltage (V) Power consumption (A)

(max. phase current		 Dimensioning power consumption (A)

(max. neutral current)
VEX240 1 x 230 V + N + PE 12,5
VEX250 3 x 400 V + N + PE 11.2 15
VEX260 3 x 400 V + N + PE  18  23.5
VEX270 3 x 400 V + N + PE  17   

With external after heating coil – Electrical (HCE)

 

Size Type designation

aftr heating coil electric HCE		 Voltage to heating coil

HCE (V)		 Dimensioning power consumption (A)

(max. phase current)
VEX240 HCE240 3 x 400 V + N + PE 8.7
VEX250 HCE250 3 x 400 V + N + PE 17.3
VEX260  HCE260  3 x 400 V + N + PE  20.2 
VEX270 HCE270  3 x 400 V + N + PE  30.3 
Technical data

EXact2

AHUC MAIN BOARD
2 x LS (Closing damper, exhaust/outdoor air) Power supply 24 VDC 
ON/OFF 24 VDC
Max. power consumption 0.3 A
FIRE (fire thermostat/smoke detector) Max. 4 A breaking current
START/STOP Digital input
ALARM Change-over relay, max 8 A @ 30 VDC or 250 VAC resistive load

 

MHCW (control for after heating coil, water)
MCCW (control for cooling coil)
MXCU (control for external cooling unit)
Communication Modbus RTU RS-485
MVM (motor valve) power supply 24 VAC
MVM (motor valve) control signal 0-10 VDC (or 10-0 V)
Relay contact for the circulation pump 250 V, max. 5 A cos φ 0.97

 

MHCE (control for after heating coil, electric)
Communication Modbus RTU RS-485
Number power steps Up to 4
Modulating power step 1 step
Supply voltage 3 x 400 V + N + PE

 

VEX200 for third-party control system

VEX200 for third-party control system

Freedom to choose your solution!

VEX200 is also offered with third-party control systems. This means the unit can be integrated to a control system from another supplier. Designed for quick and easy integration on location.

A VEX200 solution without a control system is characterized by:

  • Air handling unit with rotating heat exchanger
  • Horizontal construction
  • Free-blowing B-wheel - EXstream
  • Filter class:
    panel filter Coarse 85% or bag filter ePM10 60% (M5)
    panelfilter ePM1 55% or bag filter ePM1 60% (F7)
  • M5 or F7
  • EC-motorer klass IE5
  • EC-motorstyrning 0 – 10 V (MC)
  • Rotor pinion and rotor control are always supplied
  • Cables for frequency converters or motors (if frequency converters are not supplied) have been connected to the connector box
  • Airflow measurement points on fans led to outside of cabinet (qv)
  • Filter pressure measurement points on fans led to outside of cabinet (PSD)
  • Cables for MC and rotor controller run to terminal board.

Accessories

  • Water heating coil (HW)
  • Electrical heating coil (HE)
  • Cooling coil (CW)
  • Cooling/heating coil (DX)


 

 

Add all about the product series EXact2 control system VEX200

CONTACT US TODAY

Get free advice on ventilation products and system solutions

Export Requests:
EXHAUSTO Export
Odensevej 76
DK 5550 Langeskov
Tel +45 6566 1234
E-mail: export@exhausto.dk

Calculation programs

Use EXHAUSTO's free calculation programs for calculating ventilation plant and system solutions

Go to Calculation Programs
Vex overview

VEX Summary

Get a quick overview of our entire range of compact VEX air handling units with heat recovery.

View the VEX summary here