EXact2 control system, VEX300T

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

VEX300T

Function/component Description +Standard
-Accessory
 
Filter monitor - timer Time-based filter monitoring. The number of operating days before filter replacement can be set. +
Filter monitor - pressure (MPTF) Pressure sensors for monitoring the pressure drop across the filters – alarm for a drop to below the set value 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 temperature compensation
Airflow reduction
Outdoor compensation of airflow
Summer 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 operation at user, technician and specialist level +
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
-
Cold recovery On-demand cold recovery +
Frost protection - Tice Temperature based automatic function for frost protection of counter flow heat exchanger +
Frost protection - pressure (DEP)  Pressure based automatic energy-saving function for frost protection of counter flow heat exchanger
(requires accessory: AFC)

VEX310-320-330T
VEX340-350T



-
+
Constant pressure regulation Possible for both extract and supply air -
Motion sensor (PIR)  For automatic control of indoor air quality level -
Airflow measurement (AFC) Airflow shown on control panel/webserver.
AFC is necessary with the air control methods:
2. Constant airflow
3. Constant pressure regulated extract air with set supply air
4. Constant pressure regulated supply air with set extract air
5. Constant pressure regulated extract air with slave-controlled supply air
6. Constant pressure regulated supply air with slave-controlled extract air

VEX310-320-330T
VEX340-350T








-
+
Indoor climate levels Timer-controlled (comfort, standby, economy, off)
Manual
+
Alarm log Displays the last 100 alarms +
Alarm relay  Relay for external alarm (potential-free) +
Function list internal cooling/heating coil

EXact2

IHCW for HW - Internal water heating coil

Function/component Description
Temperature sensors 1) In the supply air to measure/control supply air temperature
2) On the return pipe from the water heating coil inside the air handling unit to keep the heating coil warm and protect it from icing
3) To prevent icing of the external pipes for the heating coil (accessory)
4) Temperature sensor on feed pipe inside the air handling unit to the water heating coil
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 of theX circulation pump for the water heating coil
2) Heat retention function (keeps heating coil free of ice)
3) Built-in control for exercise cycle of the circulation pump during periods when heating is not required

 

IHCE for HE - Internal electric heating coil

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

HE1: The overheating protections are situated in the airflow, TSA60 trips at 60 °C (automatic reset) and TSA80 trips at 80°C (manual reset)
HE2: The overheating protections are situated in the airflow, TSA70 trips at 70 °C (automatic reset) and TSA90 trips at 90°C (manual reset)

 

MXHP for DX (internal cooling-heating coil - coolant)

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

Control of external cooling/heat pump unit via:

  • Start/stop-signal
  • Signal for cooling or heating
  • On-demand regulation 0-10V (10-0 V)


MCOCW for CW - as changeover cooling/heating coil

Function/component Description
Temperature sensors 1) In the supply air to measure/control supply air temperature
2) On the return pipe from the cooling/heating coil inside the air handling unit to keep the cooling/heating coil warm and protect it from icing when it is acting as a heating coil
3) To prevent icing of the external pipes for the cooling/heating coil (accessory)
4) Temperature sensor on feed pipe inside the air handling unit to the cooling/heating coil
Modulating motor valve Valve for variably regulating the flow of water to the cooling/heating coil, depending on the requirement
Circulation pump control

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

 

MXCU - Control module for external cooling unit

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

Control system for external cooling unit via:

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

Simplified diagram

VEX300T

The simplified drawings show components that can be included in a VEX300T air handling unit.

Diagram simplified EXact2


 

Standard and accessory components

The VEX300T series 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 the standard components and accessories in the VEX300T range. Accessories must be ordered separately.

Abbreviation Designation + = Standard   
- = Accessory
BP1 Damper, bypass +
BT40-70 Safety-limit thermostat, stepless setting
-
CW  Cooling coil water  **
CP Circulation pump* -
DX Cooling/heating coil  (coolant) **
HE Electric heating coil **
HW Water heating coil **
HMI Control panel +
IHCE PCB for control of the HE coil, mounted on EXact2 PCB
+
IHCW nternal control of HW coil (integrated in EXact2 PCB)
+
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 +
MCOCW Module for control of internal CW as cooling coil or changeover cooling/heating coil
+
MC1 Motor control 1 (extract air) +
MC2 Motor control 2 (supply air) +
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    AFC Airflow control, extract air +
MPT1, P2    AFC Airflow control, supply air +
MPT2, P1    MPTF Filter monitor, extract air +
MPT2, P2    MPTF Filter monitor, outdoor air +
MPT3, P1    DEP Ice detection +
MVM Motor valve, water heating coil (HCW) -
MXHP Module for control of internal DX as cooling coil or changeover cooling/heating coil
+
SUM ALARM Alarm relay +
TE1.1 Temperature sensor, extract air – spigot 1.1 +
TE1.2 Temperature sensor, exhaust air– spigot 1.2 +
TE2.1 Temperature sensor, outdoor air – spigot 2.1 +
TE2.2 Temperature sensor, supply air - spigot 2,2 after heat exchanger +
TE Supply Temperature sensor, supply air - spigot 2,2 after cooling/heating coil 
+
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 60/70/80/90 Overheating thermostat, 60, 70, 80 and 90 °C + (HE)
* Not supplied by EXHAUSTO.

** Select between HW, CW, DX or HE

Cable dimensioning

VEX300T

The electrician installing the unit is responsible for ensuring that all sizes used are compatible with current legislation and regulations.

The VEX heat recovery unit has a built-in isolation switch.

Maximum short circuit current (Icu), in accordance with EN60947.2 is 10 kA
Maximum protection is shown in the table in "Electrical guide for VEX300T".

Maximum phase current is the dimensioned current for choice of cable. 

Fitting of RCCBs

RCCBs must be of a type that meets the following requirements:

VEX300T
PFI type A breaker that breaks the circuit when a residual current with DC content (pulsating DC) in accordance with EN 61008 is registered.

Disconnection time must be max. 0.3 s. 

The current leakage can be up to 100 mA.

 

Cable plan - accessories

VEX300T

Cable plan Accessories VEX300T


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 Control module for water cooling coil
MCOCW  Control module for XXX
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

Add all about the product series EXact2 control system, VEX300T

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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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