Dantherm HAC 1 User manual

ACCESSORY CONTROLLER (HAC)
SERVICE MANUAL
en Rev. 1.5 • 2019-W27-1

2
Introduction: Overview
Introduction
Overview
The following abbreviations and illustrations are used in the following sections.
Term Explanation
HAC Home-ventilation Accessory Controller module
USB Universal serial bus - connect to computers
GTC Geothermal brine based ground heat collector
Ele Electrical
PH Pre-heater
NO contact set that normally open, when not active
NC contact set normally closed, when not active
The following illustrations are used:
Illustration Description
Electrical heater
Water based heater
Geothermal pre-heater/cooler
External temperature sensor
Abbreviations
Illustrations used

3
Introduction: Overview
en
Part number of this service manual is 086442. The manual covers installing and setting any
factory supplied accessory to the Accessory Controller (HAC).
The target group for this service manual are the technicians who install and setup the HAC.
Copying of this service manual, or part of it, is forbidden without prior written permission.
The supplier reserves the right to make changes and improvements to the product and the
service manual at any time without prior notice or obligation.
This service manual covers the following main topics:
Manual
Target group
Copyright
Reservations
Table of contents
Introduction .....................................................................2
Overview .............................................................................2
Product description ..............................................................4
Overall description ....................................................................4
Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Connection and setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connecting external accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Duct mounted accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical preheater. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Afterheater ..........................................................................11
Geothermal collector kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Damper actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Alternating inputs ...................................................................17
CO sensor analog input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Appendix ...................................................................... 22
Overall schematic ....................................................................22

4
Product description: Overall description
Product description
Overall description
The Accessory controller is used as an extension module to the residential ventilation prod-
ucts. It is able to control a wide variety of external accessories. This section describes the
overall product, and its functionality.
This manual covers two main versions.
Model Description Fitted with Plug
HAC 1 Accessory controller with:
• 3 m cable
• daisy chain option for more MODBUS items
• Preheat option available ECH350V
6 pin screw terminals plug
HAC 2 Accessory controller with:
• 3 m cable
• NO daisy chain option
• NO preheat option 6P6C connector (RJ 12)
Please use below list, to nd correct match of components/software:
HAC Ventilation unit
Unit
sw
HAC
sw
After-heat
sensor type
Pre-heat
available
HAC 1
Horizontal with external controller
all 300 TG-K300
Yes
all 301 TG-K360
Vertical with controller placed low
on front plate
all 300 TG-K300
all 301 TG-K360
HAC 2
Vertical with controller placed high
on front plate
all 300 TG-K300
Yes.
Not controlled by
HAC 2.
all 301 TG-K360
Under ceiling unit
all 300 TG-K300
all 301 TG-K360
Introduction
HAC versions
Compatibility chart

5
Product description: Overall description
en
The software of the module, can be updated. Contact your installer if you need to update
your software.
The below shows in block schematics the in/outputs and there functions:
Fig. 1
Software update
Overall functionality
HAC main PCB
Fire-
smokedetector
Fail alarm
GTC (Geothermal
pre heat/cool)
24 V DC -
damper 2
Spring return
Operation
Standby
Filter alarm
After heat
Water/electric
CO-demand
sensor(0–10 V
Fan speed
control input)
24 V DC Damper 1
Electrical
preheater
HAC 1 version only
Hygrostat
MODBUS
24 V DC
(if running
damper)

6
Product description: Technical data
Technical data
The HAC has the following technical data
Specication Data
Power Supply DC 12V±5%
Display Dierent colour of LED:
Green = OK
Orange = Active
Red= Fault
Temperature range, operation -20 to +50 °C
Temperature range, storage -40 to +70 °C
Humidity RH max 95%, non condensing
Encapsulation IP66 (6 Pin connector not include)
Dimensions 170x140x95mm
Weight 1050g
Connections marked T1GTC, T2AH and T2AC (air temperature) inputs are compatible with
Regin TG-K300 / TG-K360 sensor. Select appropriate sensor according to the“Compatibility
chart”on page 4 and contact your installer, if you need to update the software.
Connections marked TFAH (frost protection) input is compatible to the Regin TG-A130 sensor.
This below table shows the specication of temperature sensors:
Type 10 K 12,5 K 15 K Usage
TG-K300 +30 C° 0 C° -30 C° Air temperature
TG-K360 +60°C +30 C° 0 C° Air temperature
TG-K330 +30 C° +15 C° 0 C° Air temperature
TG-A130 +30 C° +15 C° 0 C° Frost protection
Warning: Sensor TG-K330 delivered with internal thermostat controlled heaters, cannot re-
place any other of the above listed sensors.
Specication
Temp Sensor
specication

7
Product description: Connection and setup
en
Connection and setup
The HAC version with green screw terminal plugs factory tted, can be used for a wide variety
of home ventilation systems.
The HAC will be powered over MODBUS from the ventilation unit.
Follow this step by step to connect HAC to unit:
Step Action
1 Disconnect power to the ventilation unit
2 Please locate the 6 pin green socket on the ventilation unit.
Location is on top or right hand side of the units enclosure.
3 Is this socket occupied by other MODBUS controls, please disconnect.
4 Plug the HAC controller into the ventilation MODBUS socket, and reconnect
any other MODBUS control if it was present in step 3
5:Reconnect power to the ventilation unit, and conrm green“status ok”LED
on the PCB, inside the HAC, as the HAC is powered through the MODBUS.
If an external damper or motorized valve needs to be connected, an external power supply
needs to be connected as well. See separate sections for more information about additional
supplies
The HAC version with a 6P6C plug, is to be connected directly to the empty socket onto the
unit. The HAC will be powered over MODBUS from the ventilation unit.
Follow this step by step to connect HAC to unit:
Step Action
1 Disconnect power to the ventilation unit
2 Locate the RJ socket on the ventilation unit.
3 Plug the HAC controller into the ventilation MODBUS socket
4 Reconnect power to the ventilation unit, and conrm green“status ok”LED
on the PCB, inside the HAC, as the HAC is powered through the MODBUS.
If an external damper or motorized valve needs to be connected, an external power supply
needs to be connected as well. See separate sections for more information about additional
supplies
IMPORTANT: this version CANNOT control external electrical pre-heaters.
Please use internal electrical pre-heater instead.
Selected versions of the HAC module have additional MODBUS connection, as well as an ad-
ditional internal data connection.
For security reasons, none of these are to be connected to other external equipment, and no
register protocol tables are available.
Many of the control functions have options, that only can be controlled by the remote con-
trol, designed to the ventilation unit. Have at least a remote control available, when connect-
ing and setting the accessories to the HAC
The general strategy of the LED for each connector is:
Green = OK
Orange = Active
Red= Fault
The red Fail LED in the Status eld is looking after correct termination of some of the equip-
ment. I.e. it will be red if both “electrical preheating switch”is turned on and “GTC sensor” is
connected at the same time, because this is not allowed.
Screw terminal plug
version
6P6C Connector
(RJ 12)
IMPORTANT
Data protocol
Remote control
HAC failure alarm

8
Connecting external accessories: Connection and setup
Connecting external accessories
Duct mounted accessories
Important : when implementing coolers or heaters in ducts, please follow the correct order.
In order for the software in the HAC as well as the ventilation unit to work correctly, its man-
datory to follow the below shown placement order, if more heaters/coolers are mounted in
the same system.
T1
T4
T3
T2
TGA
TGK
TGK
Fig. 2
Please see each separate sections for instructions on how to install each part
Introduction
Placement

9
Connecting external accessories: Electrical preheater
en
Electrical preheater
IMPORTANT: only versions with 6 pins screw terminal plugs can control pre-heaters.
Electrical preheater is typically used to preheat the outside air in cold geographic areas in
order to keep the ventilation unit in operation all year for the pleasure of the occupants and
the home
Connect cables according schematic, to connect the 0-10V DC controlled pre-heater.
T1
T4
T3
T2
Pre-heat/cool
Afterheater
AlarmInput
CO2
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12J13
Power In
24VDC 24VDC 24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+ D- T
Fire
Therm
+-+-
Input Damper 1
Open Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby Switch
Hygro- stat
Fail Alarm Filter Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V 0 V 0 V
0 V
0 V 0 V 0 V
0 V 0 V
0 - 10V
0 - 10V
J1 J2 J3 J4 J5
230V
Pin 9 = 0 V
Pin 10 = 0-10V
>500 mm
Fig. 3
In order for the HAC to know that this is an electrical heater, and no temperature sensor is
present, press and hold the micro switch in the corner of the pcb, named“Elec.PH” for 5 sec-
onds until the LED is lit
Pre-heat/cool
Afterheater
AlarmInput
CO2
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12J13
Power In
24VDC 24VDC 24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+ D- T
Fire
Therm
+-+-
Input Damper 1
Open Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby Switch
Hygro- stat
Fail Alarm Filter Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V 0 V 0 V
0 V
0 V 0 V 0 V
0 V 0 V
0 - 10V
0 - 10V
J1 J2 J3 J4 J5
5 Sec.
Fig. 4
IMPORTANT
Introduction
Connection
Select electrical

10
Connecting external accessories: Electrical preheater
When the pre-heater is switched on, a heat symbol will show in the T1 air path
Fig. 5
The preheater will switch on/o automatically, when needed.
The preheater setpoint can be adjusted between 0° and -10°C, or be disabled.
Step Action
1 Press the RIGHT button for 10 sec., until the installer menu is activated (the icon
for the ventilation unit is ashing)
2 Press the RIGHT button till the preheater icon in the outdoor air duct (T1) ashes
slowly.
3 Press the CENTER button and the preheater icon ashes quickly together with
the previously preheater setpoint (T1/SET PH).
4 Press UP/DOWN to change the preheater setpoint and conrm by pressing
CENTER. If the setpoint is “OF” the preheating will always be switched o.
5 Press RIGHT for 10 sec. until the installer menu is closed. (the icon for the ventila-
tion unit stops ashing)
If GTC (geothermal collector) is connected, it will be permanently set to heat if the outside
temperature (T1) < 0ºC
Check functionality
Settings

11
Connecting external accessories: Afterheater
en
Afterheater
The HAC can control both an electrical and a water based afterheater. The heater will increase
the supply temperature for comfort, and will add additional heating to the house. Select ap-
propriate sensor according “Compatibility chart”on page 4
Connect cables according schematic, to connect a 0-10V DC controlled after heater.
T1
T4
T3
T2
Pre-heat/cool
Afterheater
AlarmInput
CO2
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12J13
Power In
24VDC 24VDC 24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+ D- T
Fire
Therm
+-+-
Input Damper 1
Open Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby Switch
Hygro- stat
Fail Alarm Filter Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V 0 V 0 V
0 V
0 V 0 V 0 V
0 V 0 V
0 - 10V
0 - 10V
J1 J2 J3 J4 J5
230V
0-10V DC
power control
TGK
Temp sensor
>500 mm
>500 mm
Pin 9 = 0 V
Pin 10 = 0-10V
Fig. 6
Introduction
Connection
ELECTRICAL
afterheater

12
Connecting external accessories: Afterheater
Connect cables according schematic, to connect a water based after heater kit.
T1
T4
T3
T2
Pre-heat/cool
Afterheater
AlarmInput
CO2
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12J13
Power In
24VDC 24VDC 24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+ D- T
Fire
Therm
+-+-
Input Damper 1
Open Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby Switch
Hygro- stat
Fail Alarm Filter Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V 0 V 0 V
0 V
0 V 0 V 0 V
0 V 0 V
0 - 10V
0 - 10V
J1 J2 J3 J4 J5
230V
>500 mm
Common
0-10V
AC
Orange
Red
Black
White
24 V AC 24 V AC
Blue
TGK
TGA-130
Fig. 7
When the after heater is switched on, a heat symbol will be shown in the T2 air path
Fig. 8
The afterheater will switch on/o automatically, when needed. Preconditions for the after
heater to operate is that bypass must not be active. This means that after heating cannot be
activated when outdoor temperature (T1) is >= 15°C or extract temperature (T3) is >= 24°C
(These setpoints are adjustable with remote control or PC tool)
The temperature setpoint can be adjusted in accordance with one or more of the following 3
principles:
Check functionality
Temperature
controls

13
Connecting external accessories: Afterheater
en
Option Setting
Afterheating
for comfort
supply air
If afterheating is only required to prevent supply of cold air or draught
inconvenience, the T2 supply air temperature can be used as setpoint
and regulation temperature. (Factory setting +18°C)
Afterheating
for heating of
the house
If afterheating is used as primary heat source for the whole house, T3
extract air temperature can be used as setpoint and regulation tempera-
ture. (Factory setting = OF, meaning that heating is not regulated after
this setpoint)
Afterheating
for heating of
the house or
rooms
If afterheating is used as primary heat source for the whole house and/
or specic rooms, T5 temperature measured in the remote control can
be used as regulating temperature in the room where it is placed. (More
re-mote controls can be connected) (Factory setting = OF, meaning that
heating is not regulated after this setpoint)
If all three afterheater setpoints are“OF”the afterheater is OFF.
This illustration shows the location of the three temperature setpoints described above
T5
T3
T2
Fig. 9
Follow this below procedure to change any one of the setpoint
Step Action
1 Activate the menu line by pressing CENTER
2 Press RIGHT to navigate to afterheater icon. The afterheater icon ashes slowly (30/
min). Simultaneously T2, T3 and T5 continue to show the real temperatures in the
unit.
3 Press CENTER to navigate to the AFTERHEATER menu. The display shows the latest
settings of all three setpoints (T2, T3, T5) on their respective places. OFF means that
the afterheater is not controlled in accordance with this setpoint.
4 Press CENTER. The afterheater setpoint for T2 ashes quickly (120/min), and the
afterheater icon ashes.
5 Press UP/DOWN to set the afterheater setpoint T2, and conrm by pressing
CENTER.
6 T3 afterheater setpoint now ashes quickly (120/min) and the afterheater icon
ashes.Press UP/DOWN to set the afterheater setpoint T3, and conrm by pressing
CENTER.
7 T5 afterheater setpoint now ashes quickly (120/min) and the afterheater icon
ashes.Press UP/DOWN to set the afterheater setpoint T5, and conrm by pressing
CENTER.
8 The afterheater setpoints are now set and the afterheater icon on the display
ashes slowly (30/min) and all temperatures on the display are again real measure-
ments in the unit.
9 Press CENTER for 3 seconds to leave the menu.
If all three afterheater setpoints are“OF”the afterheater is OFF.
Setpoint location
Change setpoint

14
Connecting external accessories: Geothermal collector kit
Geothermal collector kit
GTC (geothermal collector), is based on geothermal heat or any other source that can provide
constant water temperature between 0 °C. to +8°C.
If GTC is connected, it will be permanently set to pre-heat on a xed value, determined by the
unit software. Select appropriate sensor according “compatibility chart”
Likewise it is set to cool whenever the conditions for bypass-cooling are fullled.
Please follow below schematics, to connect a geothermal collector kit
T1
T4
T3
T2
Pre-heat/cool
Afterheater
AlarmInput
CO2
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12
J13
Power In
24VDC 24VDC 24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+ D- T
Fire
Therm
+-+-
Input Damper 1
Open Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby Switch
Hygro- stat
Fail Alarm Filter Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V 0 V 0 V
0 V
0 V 0 V 0 V
0 V 0 V
0 - 10V
0 - 10V
J1 J2 J3 J4 J5
230V
>200 mm
Common
0-10V
AC
Orange
Red
Black
White
24 V AC 24 V AC
Blue
TGK
Fig. 10
Pre-heat.
When GTC is connected, it will be permanently set to activate preheat on a xed temperature
that’s controlled by the unit software.
Pre-cooling.
When GTC is installed, it is enabled/disabled by the same setpoints and control strategy as
the built-in BYPASS-COOLING function, and bypass are always switched on at the same time.
Please see appropriate remote control manual for BYPASS-COOLING settings.
If the BYPASS-COOLING is automatically disabled due to high outside temperature, GTC will
still be enabled.
Introduction
Connect Geothermal
kit
Operation of
geothermal
collector

15
Connecting external accessories: Damper actuators
en
Damper actuators
The HAC controller is prepared for operation of 24V DC damper motors. The system can con-
trol both spring return (e.g. Belimo TF24) damper motors and direction controlled (e.g. Belimo
LM 24) damper motors.
IMPORTANT: In both cases, additional DC power for the damper motors, must be delivered by
an external 24 VDC power supply.
Whenever there is power to the system all dampers are open unless:
• Standby switch is activated (J8)
• Fan speed 0 is selected due to any reason for longer/shorter time
• Fire thermostat is activated (open circuit)
Follow the below schematic to connect one or more direct controlled damper motor.
The output can handle a maximum of 100 mA current, and is over current protected with a
self-resetting fuse.
T1
T4
T3
T2
T1
T4
T3
T2
Pre-heat/cool
Afterheater
AlarmInput
CO2
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12J13
Power In
24VDC 24VDC 24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+ D- T
Fire
Therm
+-+-
Input Damper 1
Open Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby Switch
Hygro- stat
Fail Alarm Filter Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V 0 V 0 V
0 V
0 V 0 V 0 V
0 V 0 V
0 - 10V
0 - 10V
J1 J2 J3 J4 J5
230V
GND
24 V DC
1=Open 2=Close
230V AC / 24V DC PSU
min. 100 mA
Fig. 11
Introduction
Connect a DIRECT
CONTROLLED
motor (3 wires)

16
Connecting external accessories: Damper actuators
Follow the below schematic to connect one or more spring return damper motor. This type
will open if powered, and closed again when power is disconnected.
The output can handle a maximum of 300 mA current, and is over current protected with a
self-resetting fuse.
T1
T4
T3
T2
T1
T4
T3
T2
Pre-heat/cool
Afterheater
AlarmInput
CO2
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12J13
Power In
24VDC 24VDC 24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+ D- T
Fire
Therm
+-+-
Input Damper 1
Open Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby Switch
Hygro- stat
Fail Alarm Filter Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V 0 V 0 V
0 V
0 V 0 V 0 V
0 V 0 V
0 - 10V
0 - 10V
J1 J2 J3 J4 J5
230V
GND
24 V DC
230V AC / 24V DC PSU
min. 300 mA
Fig. 12
Connect a SPRING
RETURN MOTOR
(2 wires)

17
Connecting external accessories: Alternating inputs
en
Alternating inputs
In case re protection system is desired it is possible to connect re thermostat(s) to the
system on terminal J2. It can be recommended in combination with damper solutions. (see
section damper control)
The Fire thermostat is tted with a jumper wire from factory. The +24VDC from J1 (damper
24VDC input) is routed through this jumper, and direct to damper 1 output (spring return
TF24). This ensures immediate damper shut down, if re burns down the HAC controller.
Fire alarms are signalled to the ventilation unit that shuts down as well, and can only be reset
by re-booting the ventilation unit. No user interaction applies.
Connect with a NO (normally open) relay as shown. Power on the relay coil makes the relay
active, and no re input. If this circuit is broken due to re OR smoke detector removes the
power from the coil, the input will disconnect, and in any case close the dampers, and stop
the unit
The re thermostat carries a maximum of 24V DC / 300 mA.
Pre-heat/cool
Afterheater
AlarmInput
CO₂
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12J13
Power In
24VDC
24VDC
24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+
D-
T
Fire
Therm
+-+-
Input Damper 1
Open
Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby
Switch
Hygro-
stat
Fail
Alarm
Filter
Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 - 10V
0 - 10V
J1 J2 J3 J4
J5
A
1
A
2
1
2
A
1
A
2
1
3
2
Coil driver
Fig. 13
The unit can be set to standby mode using closed contact on J8. The unit will stay in standby
mode until the contact is open again.
CAUTION: It is only allowed to stop the ventilation unit for 4 hours, unless dampers are
installed to avoid drafting air which can cause condense problems and cold draft issues. The
supplier cannot be held responsible for any unwanted usage of this input.
The input will sink a maximum of 12V DC/ 1 mA
Connection:
• Connect a potential free normally open (NO) switch to connector J8, between pin 3 and
pin 4.
• When the switch is active, the ventilation unit is stopped.
• When the switch is released, the ventilation unit resumes previous operation.
No user interaction applies
Alternative connect an OC output circuit (Open Collector) that can sink minimum 1 mA
Fire thermostat
Standby switch

18
Connecting external accessories: Alternating inputs
Pre-heat/cool
Afterheater
AlarmInput
CO2
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12J13
Power In
24VDC
24VDC
24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+
D-
T
Fire
Therm
+-+-
Input Damper 1
Open
Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby
Switch
Hygro-
stat
Fail
Alarm
Filter
Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 - 10V
0 - 10V
J1 J2 J3 J4 J5
A
1
A
2
1
2
A
1
A
2
1
3
2
Coil driver
Fig. 14
If an external on/o humidistat is connected to the system the ventilation unit will speed up
to fans speed 3 whenever the RH% of the external humidistat setpoint is exceeded.
Connect a humidistat with normally open (NO), potential free contacts, to connector J8 be-
tween pin 1 and pin 2.
Alternative connect an thermostat with OC output circuit (Open Collector) that can sink mini-
mum 1 mA
Pre-heat/cool
Afterheater
AlarmInput
CO2
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12J13
Power In
24VDC
24VDC
24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+
D-
T
Fire
Therm
+-+-
Input Damper 1
Open
Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby
Switch
Hygro-
stat
Fail
Alarm
Filter
Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 - 10V
0 - 10V
J1 J2 J3 J4 J5
A
1
A
2
1
2
A
1
A
2
1
3
2
Coil driver
Fig. 15
The RH% digit value shown is always the internal sensor if any.
The drop will be“FULL”if any external humidity sensor is overruling the internal.
Fig. 16
Humidistat
RH% display

19
Connecting external accessories: CO2 sensor analog input
en
CO sensor analog input
If a CO-sensor is connected and the unit is set to AUTO mode the airow is controlled by the
CO-concentration in the room where the CO-sensor is placed.
Connect the CO sensor to connector J9
Pin 1: +16V DC / 100mA power
Pin 2: Gnd
Pin 3: 0-10V DC input
Pin 4: Gnd
Pre-heat/cool
Afterheater
AlarmInput
CO₂
Aux
Aftercooler
J6
J11
J7
J8
J9
J10
J12J13
Power In
24VDC
24VDC
24VDC
12V
USB
Fail
OK
Status
Elec. PH
0V
0V
D+
D-
T
Fire
Therm
+-+-
Input Damper 1
Open
Open
Damper 2 ModBus
1
+
2
+
T1GTC
+16V
Standby
Switch
Hygro-
stat
Fail
Alarm
Filter
Alarm
+12V
SDA
SCL
TFAH
T2AH
T2AC
0 - 10V
0 - 10V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 - 10V
0 - 10V
J1 J2 J3 J4 J5
V+
GND
CO 2
GND
Fig. 17
The CO sensor input can also be used for direct fan speed control, from external BMS sys-
tems, like KNX, LON, IHC, Smarthouse, Lutron etc.
All of these systems has in general a 0-10V DC output DIN rail module, intended to be used
for dimming uorescent lamps, by controlling the internal ballast controllers.
Connect a DIN rail module 0-10V output (compatible with your type BMS) to the CO input
and control the fan speed according the below diagram.
Fig. 18
As the fan control is softly accelerating/decelerating, it is recommended to apply “Scenes”
in BMS programming on the 0-10V DC module, in which the light amount is set in %, when
changing fan speed.
If the unit is tted with another demand sensor, this could keep the fan in another speed if
the demand is higher.
CO sensor
External fan control

20
Connecting external accessories: CO2 sensor analog input
When any external CO is detected, the cloud and corresponding digit will be shown in the
display of the remote displays
Fig. 19
CO level display