ASKOMA ASKOHEAT User manual

ASKOHEAT-F+ Flange heater Ø 180mm
MV-012-6791.2 01.11.2021 www.askoma.com Page 1
Fitting instructions, user manual and service
Flange heater Ø 180mm
for drinking and heang water
AHFR-BI-plus-1.75 up to 5.8 kW
• AHFR-BI-plus-1.75
• AHFR-BI-plus-3.5
• AHFR-BI-plus-4.4
• AHFR-BI-plus-5.8
Index
General safety and assembly informaon Page 2
Operang instrucons Page 3
Assembly instrucons Page 4
User manual Page 6
Operang condions Page 7
Electrical diagram Page 8 / 9
Service Page 10
Malfuncon Page 10
Please keep in a safe place

ASKOHEAT-F+ Flange heater Ø 180mm
MV-012-6791.2 01.11.2021 www.askoma.com Page 2
Assembly information
The device must be installed horizontally, an installaon from above or below is not permiet for
safety reasons.
Make sure that the heang tubes are enrely covered by the liquid before placing into operaon.
The circulaon of the liquid shall not be inhibited.
Operang data, applicaon, dimensions and model of the ange heater are on the idencaon plate
and circuit diagram on the device, respecvely inside the housing cover, or can be found in the ng
instrucons / user manuals.

• Do not place the device into operaon unl aer having read the user manual.
• These devices may be used by children aged 8 or more and by persons with reduced physical, senso-
ry or mental capacity or those lacking in experience and/or knowledge if they are supervised or if
they have been instructed in safe operaon of the device and understood the resultant dangers.
Children may not play with the device. The device may not be cleaned or serviced by children unless
they are supervised.
General safety information
Installation, setting and removal must be
carried out only by qualified electri cians.

ASKOHEAT-F+ Flange heater Ø 180mm
MV-012-6791.2 01.11.2021 www.askoma.com Page 3
Operating instructions
Important information
If a heat exchanger is ed in the same tank, the controller must limit the temperature caused by the
heat exchanger to 85°C. This prevents the safety temperature limiter of the ange heater tripping.
Safety temp erature limiter
The safety temperature limiter may trip at temperatures lower than approx. –15°C (e. g. transportaon
or storage). If this happens, press the reset buon, see page 6 “user manual”.
The device may o nly be used to h eat water.
Corrosion protection
Please note: This heang element is applicable in stainless steel boiler as well as in black steel / black
steel enamelled boilers. Select the sengs via DIP switch according to the boiler type.
For an installaon of the heang element into black steel or black steel enamelled boilers, the red slide
switch (DIP switch) has to be le in posion “Schwarzstahlspeicher” (factory seng).
When installing the heang element into a stainless steel or chrome steel boiler, the slide switch
(DIP switch) has to be switched to posion “Edelstahlspeicher”.
Electri cal connection
The device is intended for xed connecon only and may be connected only to xed cables. Select a
cable cross-secon suitable for the power rang of the device. All poles of the device must be able to
be disconnected from the mains by means of an at least 3mm isolang distance. The PE wire must be
100mm longer than the other conductors.
In the event of the following the guarantee is vo id:
- Not complying with this paperwork „Fing instrucons, user manual, and service“
- Not complying with the storage heater manufacturer's ng instrucons
- Technical modicaons, repairs or tampering with the device (including exchanging the thermostat)
- Applicaons for which the device was not designed
- Incorrect operaon and maintenance
- Not complying with direcve VDI 2035
- Manipulaons on the operang soware
- Undocumented parameterizaons via the documented interfaces

ASKOHEAT-F+ Flange heater Ø 180mm
MV-012-6791.2 01.11.2021 www.askoma.com Page 4
Assembly instructions
1.
6.
3. 4.
5.
2.
Screw the flange heater including the seal onto the storage tank,
note the installation position , see „TO P“ sticker
Tighten screws by hand
Carefully unscrew the housi ng cover
Clean the sealing surface of the flange
Tighten the screws with a torque wrench
Fill the tan k and check for leaks

ASKOHEAT-F+ Flange heater Ø 180mm
MV-012-6791.2 01.11.2021 www.askoma.com Page 5
Connect flange heater electrically
- Plug Z1—Connect the power supply to the heang element as follows:
Connecon 1: L1
Connecon 2: L2
Connecon 3: L3
Connecon N: N
Connecon PE: PE
- Plug Z2—Temperature sensor (oponal)
Connecon 1: Temperature sensor 1
Connecon 2: Temperature sensor 2
Connecon 3: Temperature sensor 3
Connecon 4: Temperature sensor 4
Connecon 5: GND
Connecon 6: Relay K4
- Plug Z3—Heat pump request / 0-10V analogue signal (oponal)
Connecon 1: GND
Connecon 2: Heat pump request
Connecon 3: Analogue input 0-10V
Connecon 4: RS485: A
Connecon 5: RS485: B
Connecon 6: RS485: GND
- Plug Z4— LAN connecon via data cable and RJ45 socket
Assembly instructions

ASKOHEAT-F+ Flange heater Ø 180mm
MV-012-6791.2 01.11.2021 www.askoma.com Page 6
User manual for the user and qualied installer
Device descr iption
The ASKOHEAT-F+ is switched in 7 steps via the digital Modbus interface or the analogue 0-10V input.
In addion, the maximum level up to 24 hours can be acvated via the „Emergency On“ buon (Pos. 2)
or the digital input „Heat pump request“.
The use of the interface is described in a separate document (Modbus protocl) and can be downloaded
from our homepage.
Temperature control
The maximum temperature can be connuously adjusted with the rotary knob (pos. 1). The range ex-
tends from „Out“ to approx. 85°C. For economic reasons, it should be set to approx. 65°C.
When the temperature is reached, the device switches o and on again automacally if necessary.
Safety temp eratur limiter
If the safety temperature limiter has tripped, you can reset it with a "00 screwdriver" through the
opening marked "Reset". This cannot be done unl the temperature has cooled down by approx. 10K.
Emergency operation „Emergency On“
The maximum heang output can be switched on immediately with the „Emergency On“ buon. To do
this, press the buon for at least 2 seconds. This may be necessary in the event of a fault or if addio-
nal heat is required. To switch o, press the buon again for at least 2 seconds. For safety reasons, the
ASKOHEAT-F+ automacally switches back to normal operaon aer 24 hours.
Safety: EN60335-1 / -2-21 / -2-73
EMC: EN55014-1 / -2
CEM: EN62233
IP Code: EN60529
Applicable
standards
Pos. 1 Temperature control
Pos. 2 Emergency On
Pos. 3 Reset buon
Pos. 4 Operang lights

ASKOHEAT-F+ Flange heater Ø 180mm
MV-012-6791.2 01.11.2021 www.askoma.com Page 7
Operating conditions
LED 1: STATUS
Blue Communicaon over ethernet (MODBUS TCP, RTU, webbrowser or HTTP-JSON
(e.g. Energy Manager) within last 5 seconds
Red—Flashing Error, for further informaon open the local webpages of ASKOHEAT+
White—Flashing Idenfy for 20 seconds or Emergency Mode toggles on or o / very fast ashing
at start and stop update
LED 2: CONNEC TION
Red Connecon to local network (LAN)
Green LAN (Ethernet) connected to a switch, hub or router
Yellow-ashing Data communicaon over LAN (Ethernet)
Blue-ashing ASKOHEAT+ is running without LAN connecon, e.g. using only analog input
LED 3: MODE
Yellow Heater relais are acve, but without current ow (switch-o by thermostat)
Green Heater is acve with current ow
Blue-ashing Emergency Mode is acve
White Idenfy for 20 seconds or Emergency Mode toggles on or o / very fast ashing
at start and stop update

ASKOHEAT-F+ Flange heater Ø 180mm
MV-012-6791.2 01.11.2021 www.askoma.com Page 8
Electrical diagram
WARNING! All power supply circuits must have been switched o before accessing
the connecon terminals.
Electrical and connecon diagram 1.75 kW
• AHFR-BI-plus-1.75

ASKOHEAT-F+ Flange heater Ø 180mm
MV-012-6791.2 01.11.2021 www.askoma.com Page 9
Electrical diagram
WARNING! All power supply circuits must have been switched o before accessing
the connecon terminals.
Electrical and connecon diagram 3.5 kW - 5.8 kW
• AHFR-BI-plus-3.5
• AHFR-BI-plus-4.4
• AHFR-BI-plus-5.8

ASKOHEAT-F+ Flange heater Ø 180mm
MV-012-6791.2 01.11.2021 www.askoma.com Page 10
Service
1.
2.
Malfunction
Reset
See user manual for the
qualied installer.
The device must be
cleaned (descaled) with
a suitable professional
descaling agent, e. g.
citric acid.
If the safety temperature
limiter trips, there is a fault
or error. A qualied expert
must inspect the system in
this case.
The version currently valid can be downloaded under "Downloads" from our homepage
2x / year
When the heater is used in hard water areas it must be
regularly descaled.
It is imperave that the local circumstances are paid aen-
on to.
The build up of scale in the heang element can lead to the
acvaon of the safety temperature limiter or thermal
overloading thereby destroying the heang elements.
In such cases the guarantee is not valid!
New
Needs cleaning
For technical data see the data sheet Subject to technical alteraons