EXHAUSTO's advanced EXact2 control system controls VEX140-150-60-170

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

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 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/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.

	External stop If the ventilation system has been stopped by an external start/stop signal, this symbol will appear in the display.

	De-icing If the built-in de-icing function is in operation, this symbol will appear in the display.

	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.

	Weekly plan When operating with the weekly plan activated, the clock symbol will appear in the display.

	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-controlled operation.

	AUX Externally-controlled operation.

	Summer/winter The Exact2 control system automatically changes from summer time to winter time. The symbol indicates either summer time or winter time.

	Fire Fire thermostat(s)/smoke detector activated

	Service Service display connected.

	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:

The unit can be monitored and configured using a local PC.
The unit can be connected to a local area network (LAN) and controlled by a PC connected to the LAN.
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.

Unit function overview

VEX100CF

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	+
Regulating 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)	+
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	+
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)	+

Functions overview heating

EXact2

HCW - 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 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 - Internal electric heating coil

Function/component	Description
Temperature sensors	In the supply air 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 automatic reset
	3) TSA90 is located in the airflow, trips at 90 °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
Temperature sensors	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
Circulation pump control	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

VEX100CF

With HCW and EXact2 control system

The simplified drawings show components that can be included in a VEX140CF air handling unit.

VEX100CF Simplified diagram

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.

With HCE and EXact2 control system

Standard and accessory components

The VEX100CF 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 VEX100CF range. Accessories must be ordered separately.

Abbreviation	Designation	+ = Standard - = Accessory
BP1	Damper, bypass	+
BT40-70	Safety-limit thermostat, stepless setting	-
CCW	Water cooling coil	-
CP	Circulation pump*	-
HCE	Electric heating coil**	+
HCW	Water heating coil**	+
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	Water cooling coil, control system	-
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	Control module for external cool/heat pump units	-
MXCU	Control module for external cooling units	-
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	+
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 70/80/90	Overheating thermostat, 70, 80 and 90 °C	-

* Not supplied by EXHAUSTO.
** It is only possible to choose HCW or HCE - not both at the same time.

Cable dimensioning

VEX100CF

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 and automatic fuses for internal overload and short-circuit protection.

Maximum short circuit current (lcu), in accordance with EN60947.2 is 10 kA.
Maximum fuse rating is 63A gG/gL except for VEX170CF with HCE, where the maximum fuse rating is 100A gG/gL.

Accessory types CCW and XCU do not require separate supply cables and can be directly connected to the VEX100 range 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 CCW/XCU (cooling) can be connected. The EXact2 control system prevents both after heating and cooling operating at the same time.

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.

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

VEX140CF / VEX150CF / VEX160CF
PFI type A breaker in accordance with EN 61008, which breaks the circuit when leakage-current is registered with DC content (pulsating DC).

VEX170CF
PFI type B breaker according to EN 61008, that breaks the circuit when a vagrant current with DC content (pulsating DC) or smooth vagrant current is registered.

Cutout time must be max. 0.3 s.
The current leakage can be up to 100 mA.

Control fuses integrated in VEX100CF range with water heating coil (HCW)

	VEX140CF	VEX150CF	VEX160CF	VEX170CF
Voltage (V)	1 x 230 V+N+PE	3x400V+N+PE
Fuse for control system (1x230V) 2 pole	C-10A	C-10A	C-10A	C-10A
Fuse for MC1 (1x230V) 2 pole	C-10A	C-10A	C-20A
Fuse for MC2 (1x230V) 2 pole	C-10A	C-10A	C-20A
Common fuse for MC1 and MC2 (3x400V) 3 pole				C20A
Total number of fuses	3	3	3	2

Control fuses integrated in VEX100 range with electric heating coil (HCE)

	VEX140		VEX150
	7.2 kW	14.4 kW	12 kW	18 kW
Fuse for control system (1x230V) 2 pole	C-10A	C-10A	C-10A	C-10A
Fuse for MC1 (1x230V) 2 pole	C-10A	C-10A	C-10A	C-10A
Fuse for MC2 (1x230V) 2 pole	C-10A	C-10A	C-10A	C-10A
Fuse (1) for HCE (3x400V) 3 pole	C-16A	C-32A	C-32A	C-32A
Fuse (2) for HCE (3x400V) 3 pole				C-16A
Total number of fuses	4	4	4	5

	VEX160CF			VEX170CF
	14,4 kW	21,6 kW	28.8 kW	31,2 kW	46,8 kW
Fuse for control system (1x230V) 2 pole	C-10A	C-10A	C-10A	C-10A	C-10A
Fuse for MC1 (1x230V) 2 pole	C-20A	C-20A	C-20A
Fuse for MC2 (1x230V) 2 pole	C-20A	C-20A	C-20A
Common fuse for MC1 and MC2 (3x400V) 3 pole				C-20A	C-20A
Fuse (1) for HCE (3x400V) 3 pole	C-32A	C-32A	C-32A	C-32A	C-32A
Fuse (2) for HCE (3x400V) 3 pole		C16-A	C-32A	C-32A	C-32A
Fuse (3) for HCE (3x400V) 3 pole					C-32A
Total number of fuses	4	5	5	4	5

Cable plan - accessories

VEX100/VEX100CF

VEX100/VEX100CF with HCE heating coil

VEX100/VEX100CF with HCW heating coil

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	Water cooling coil, 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

VEX100CF

With internal heating coil - Water (HCW)/Cooling coil (CCW)

VEX100CF HCW cable plan

Model	Voltage (V)	Power consumption (A) (max. phase current)	Dimensioned power consumption (A) (max. phase current)
VEX140CF	1 x 230V+N+PE 50Hz	12,5
VEX150CF	3 x 400V+N+PE 50Hz	8,7	15
VEX160CF	3 x 400V+N+PE 50Hz	15,5	23,5
VEX170CF	3 x 400V+N+PE 50Hz	17,5

With internal heating coil – Electric (HCE)

RD13439DK_VEX100_HCE_cable_plan

VEX size	Output HCE (kW)	Voltage (V)	Power consumption (A) (max. phase current)
VEX140CF	7,2	3 x 400V+N+PE	15,5
VEX140CF	14,4	3 x 400V+N+PE	26
VEX150CF	12	3 x 400V+N+PE	26
VEX150CF	18	3 x 400V+N+PE	34,7
VEX160CF	14,4	3 x 400V+N+PE	36,5
	21,6	3 x 400V+N+PE	46,7
	28,8	3 x 400V+N+PE	57
VEX170CF	31,2	3 x 400V+N+PE	62,5
VEX170CF	46,8	3 x 400V+N+PE	85

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

VEX100CF

VEX100CF-X Simplified diagram

Freedom to choose!

VEX100CF 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 VEX100CF solution connected to a third-party control system:

Air handling unit with counter flow heat exchanger
Compact unit
Integral double bypass with 24 V motor (BP1)
Free-moving B-impeller - EXstream
Filter class Coarse 85% (M5) or ePM1 55% (F7)
Integral double bypass with 24 V motor
EC motors class IE5
EC motor control 0-10 V (MC)
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 bypass damper run to terminal board.

Accessories

External water cooling coil (CCW)
Closing damper (LS)
External cooling/heating coil (DX)

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