VEX340 EXact2 control system

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.

HMI control panel

EXact2

The control panel has two security modes  – locked or opened. If set to locked mode, the control panel can only be used for normal, daily use. More advanced options are not available.

In opened mode, the technician or specialist has access to more advanced menus and functions. The control panel requires an access code to be operated in open mode.


User menu

HMI brugerniveau 150 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.

Specialist menu

 

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.


 

Display icons

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

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.
   
Afisning De-icing
If the built-in de-icing function is in operation, 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.
 
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

For technician mode use the following:

User name: VEX340
Access code: 1111

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

Unit function overview

VEX340

Function/component Description +Standard
-Accessory
 
Filter monitor Pressure sensors for monitoring the pressure drop across the filters – 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 in spring, summer and autumn.
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 fire detection switches can be connected. In the case of a tripped fire alarm, the unit’s functions are adjustable. -
Closing damper, outdoor air
(requirement for water heating coil)
The damper is fitted in the outdoor air duct – it shuts when the unit stops – available with a spring-return motor -
(+)
Closing damper, exhaust air The damper is fitted in the exhaust air duct – it shuts when the unit stops – available with a spring-return motor -
Regulating temperature
Regulation of the supply air temperature +
Regulation of the room temperature +

 

 

Function/component Description +Standard
-Accessory
Compensation functions




Outdoor air temperature compensation +
  Airflow reduction +
Outdoor airflow compensation +
Summertime compensation +
CO2 compensation +
Humidity compensation +
Night-time cooling The unit can be set to start at night to cool the building +
Control panel Panel for operating unit in user, technician and specialist mode +
Weekly timer For setting the times required for changes between indoor air quality levels +
Web server Web server with control and monitoring option -
Modbus RTU RS485, BACnet MSTP, BACnet IP
Bus communication
(requires Web server)
Modbus TCP/IP -
LONWORKS® -
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 -
Airflow measurement Airflow shown in control panel +
Indoor climate levels
Timer-controlled (comfort, standby, economy, off) +
Manual +
Alarm log Displays the last 100 alarms +
Timers 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

VEX340

The simplified drawings show components that can be included in a VEX340H air handling unit.

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 than 10m, the connection can be made directly on the main PCB.


 

Standard and accessory components

VEX340 is supplied with a range of components fitted in the unit or for fitting in the duct system and in the appropriate room. The table below shows standard and accessory components for VEX340. Accessories must be ordered separately.

Abbreviation Designation + = Standard   - = Accessory
BP1 Damper, bypass +
BP2 Damper, bypass +
BT40-70 Safety-limit thermostat, stepless setting
-
MC1 Motor control 1 (extract air) +
MC2 Motor control 2 (supply air) +
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) -
M1 Fan motor 1 +
M2 Fan motor 2 +
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-DUCT CO2 sensor, duct -
MIO-CO2-ROOM CO2 sensor, room -
MIO-PIR PIR sensor -
MIO-RH-ROOM Humidity sensor (RH) -
MIO-TS-DUCT Temperature sensor, extract air duct (external) -
MIO-TS-ROOM Temperature sensor, room -
MPT-DUCT Pressure sensor for constant pressure regulation -
MPT1, P1 Airflow control, extract air +
MPT1, P2 Filter monitor, extract air +
MPT2, P1 Airflow control, supply air +
MPT2, P2 Filter monitor, outdoor air +
MPT3, P1 Ice detection +
MVM Motor valve, water heating coil (HCW) -
MXHP  Control module for external cool/heat pump units 
MXCU  Control module for external cool/heat pump units 
SUM ALARM Alarm relay +
TE11 Temperature sensor, extract air – spigot 1.1 +
TE12 Temperature sensor, exhaust air– spigot 1.2 +
TE21 Temperature sensor, outdoor air – spigot 2.1 +
TE22 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 piping (HCW) -
TSA 60/70/120 Overheating thermostat, 60, 70 and 120 °C -
Cable dimensioning

VEX340

The electrician installing the unit is responsible for ensuring that all sizes used are compatible with current legislation and regulations. The VEX340 heat recovery unit has a built-in isolation switch and automatic fuses for internal overload and short-circuit protection.

The HCE electric heating coil control system has a built-in isolation switch and the control system has short-circuit protection. HCE internal cables and heating element also 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 gG/gL.

Accessory types HCW, CCW and XCU do not require separate supply cables and can be directly connected to the VEX340 control system box. Terminals (U1, N) may only be used with the above mentioned accessories, and can have a 2 A maximum load. A maximum of one HCW (after heating) and one CCW/XCU (cooling) can be connected. The EXact2 control system prevents both after heating and cooling operating 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 the type of HCE (electric after heating).

Fitting of earth leak circuit breakers
If earth leak circuit breakers are fitted, they must meet the following standards:

a) PFI type A circuit breaker in accordance with EN61008, which breaks the circuit when leakage-current is registered with DC content (pulsating DC).
b) Cutout time must be max. 0.3 s.

The current leakage can be up to 100 mA.

Control fuses built-in in the VEX340

Model VEX340
Voltage (V) 1 x 230 V + N + PE
Fuse for control system
(1 x 230 V) 2 pole
C-10A
Fuse for MC1
(1 x 230 V) 2 pole
C-10A
Fuse for MC2
(1 x 230 V) 2 pole
C-10A
Total number fuses 3
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


Cable plan - coils

VEX340

 

With external after heating coil - Water (HCW)/Cooling coil (CCW)

 

 

Model Voltage (V) Dimensioned power consumption (A)
(max. phase current)
VEX340 1 x 230 V + N + PE 12.5

With external after heating coil – Electric (HCE)

Model Voltage (V) Dimensioned power consumption (A)
(max. phase current)
VEX340 1 x 230 V + N + PE 12.5
HE40006BUE 3 x 400 V + N + PE 8.7

 

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

 

For third-party control system

VEX340

Freedom to choose!

VEX340 can be connected to other third-party control systems. This means the unit can be integrated to a control system from another supplier. Designed for quick and easy integration.

A typical VEX340H solution connected to a third-party control system:

  • Air handling unit with counter flow heat exchanger
  • Compact unit
  • Base fitted
  • Horizontal model
  • Built-in double bypass with 24 V motor
  • Free-moving B-impeller- EXstream
  • Filter class Coarse 85% (M5) or ePM1 55% (F7)
  • EC motors class IE5
  • EC motor control 0–10 V (MC)
  • Airflow measurement points on fans (hoses not supplied)
  • Cables for MC and bypass damper run to terminal board.

Accessories

  • External water heating coil (HCW)
  • External electric heating coil (HCE)
  • External cooling coil (CCW)
  • External cooling/heating coil (DX)

 

Add all about the product series VEX340 EXact2 control system

CONTACT US TODAY

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Export Requests:
EXHAUSTO Export
Odensevej 76
DK 5550 Langeskov

Tel +45 6566 1236
E-mail: export@exhausto.dk
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