Danfoss Heating Surfaces Installation guide
- Type
- Installation guide
Danfoss Heating Surfaces are designed to provide efficient and reliable heating solutions for a variety of applications. These surfaces can be used for pre-heating or after-heating air in ventilation systems, ensuring optimal comfort levels and preventing freezing in cold climates. With their advanced features, Danfoss Heating Surfaces offer precise temperature control, energy efficiency, and ease of installation. Whether you need to maintain a comfortable indoor temperature or prevent frost formation, Danfoss Heating Surfaces provide a versatile and effective solution.
Danfoss Heating Surfaces are designed to provide efficient and reliable heating solutions for a variety of applications. These surfaces can be used for pre-heating or after-heating air in ventilation systems, ensuring optimal comfort levels and preventing freezing in cold climates. With their advanced features, Danfoss Heating Surfaces offer precise temperature control, energy efficiency, and ease of installation. Whether you need to maintain a comfortable indoor temperature or prevent frost formation, Danfoss Heating Surfaces provide a versatile and effective solution.
DANFOSS HEATING
Danfoss Air
Installation guide for Danfoss Heating Surfaces
MAKING MODERN LIVING POSSIBLE
Index
1.0 Mounting electrical heating surfaces
1.1 About electrical pre-heating surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.2 About electrical after heating surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Positioning of an electrical heating surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Positioning of sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Electrical connection and connecting communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.6 System overview – one heating surface connected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.7 System overview – two heating surfaces connected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.8 Troubleshooting table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.0 Mounting waterborne after heating surfaces
2.1 About waterborne after heating surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Positioning of a water heating surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Positioning of sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Hydraulic connection of water heating surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5 Electrical connection of water heating surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.6 Call for heating to the central heating system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.7 Troubleshooting table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.0 Mounting geothermal surfaces
3.1 Before you start. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2 Dimensioning ground collectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.3 Laying ground collectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.4 Filling with brine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
3.5 Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3.6 Installation in duct system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
3.7 Positioning of sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
3.8 Troubleshooting table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.0 Technical data
4.1 Technical data – water heating surface W-AH 250 & geothermal surface Geo 250 . . . . . . . .19
4.2 Technical data – electrical heating surfaces EL-PH & EL-AH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Installation The Danfoss Air system – Heating surfaces
2
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1.1
About electrical
pre-heating surfaces
The electrical pre-heating surface is built into the
duct system on the outdoor air side.
The aim of the pre-heating surface is to ensure
that the temperature in the system remains above
freezing, which allows it to always guarantee the
required balance between the air intake and
extraction volumes.
Note: A system without a pre-heating surface
will gradually reduce the air intake volumes
during long term operation at outside tempera-
tures below -3°C in order to prevent freezing. In
an average house this is an excellent solution,
but in extremely airtight buildings (low energy
constructions), the imbalance could cause a
non-desirable negative pressure inside the house.
Installing a pre-heating surface is therefore
recommended here.
Note! The electrical heating surface must be
installed by a certified electrician.
The electrical After heating surface is built into
the duct system, on the air intake side. The
purpose of the After heating surface is to slightly
raise the supply air temperature, to prevent
discomfort in room where supply air is distributed.
Note: The electrical heating surface must be
installed by a certified electrician.
Installation 1.0 Mounting electrical heating surfaces
1.2
About electrical
after heating surfaces
Overview table, electrical pre-heating surface
50 cm 50 cm
230V, 50 Hz
A
B
C
D
EF
G
H
I
J
K
A Extract air G Supply cable to the surface
B Supply air H Supply cable to automatic function
C Outdoor air I Communication cable HRV unit -> external controller.
D Exhaust air J Post-heating (to be insulated with mm glass/mineral
wool).
E Sensor placed before surface K External controller (must not be insulated)
F Sensor placed after surface
Overview table, electrical after heating surfaces
Isoleres med 50mm
sten- eller glasuld
50 cm
50 cm
230V, 50 Hz
A
B
C
D
E
F
G
H
I
J
K
A Extract air G Supply cable to the surface
B Supply air H Supply cable to automatic function
C Outdoor air I Communication cable HRV unit -> external controller.
D Exhaust air J Post-heating (to be insulated with mm glass/mineral
wool).
E Sensor placed before surface K External controller (must not be insulated)
F Sensor placed after surface
3
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• The heating surface must be placed at a
minimum distance of twice the diameter of the
heating surface, to the nearest obstacle (be it
bends, external filters or the unit itself).
• The connection box on the actual heating
surface should face upwards or horizontally. It
must NOT face downwards.
• The heating surface MUST be insulated with
non-flammable insulating material.
• Note: The cover of the electrical surface’s
external controller must NOT be insulated, but
must remain visible so that the manual
over-heating protection can be deactivated if
this is triggered unexpectedly.
• The heating surface must be placed a minimum of
30 mm from any wooden building components.
• Make sure that the surface faces in the correct
direction in relation to the direction of airflow
in the system. The arrow on the heating surface
must match the direction of airflow in the
system.
min 2 x Ø min 2 x Ø
• The two factory mounted PT-1000 sensors must
be placed in the duct system 50 cm in front of
and 50 cm behind the surface.
• Important! Make sure that the sensors show
where they must be placed, either in front of
or behind the surface. If the sensors face the
wrong way, the required operations cannot be
achieved.
• Drill Ø8 mm holes in the duct and install the
rubber sleeves supplied, then lead the sensors
into the duct. Fix the sensors to the pipe using
duct tape and insulate together with the rest of
the duct system and heating surface.
Seen in direction of airflow
45 mm
Rubber sleeve.
Insulation.
1.5
Electrical connection
and connecting
communications
The electrical connection can be divided into
three steps:
1. The mains lead from the supplied external
controller (marked “supply voltage 230 V, 50 Hz”)
is connected to the mains power, using a
suitable junction box. We recommend that the
heating surfaces be supplied from a separate
group.
2. The power cable from the external controller
(marked “to heating surface”) is connected to
the electrical heating surface, cf. electrical
diagram.
3. The supply cable for the heating surface, is fed
through the pre-punched holes in the heating
surface junction box. A cable gland must be
used to provide strain relief.
4. The communication cable is mounted
between the external controller and the
ventilation system’s serial input (also see the
following pages).
Note! The control box must not be insulated
Installation 1.0 Mounting electrical heating surfaces
Electrical
heating
surfaces
Solid state relæ
3 4 5 6
Gråt modbus stik, set
fra tilslutningsside
20 21
N L PE
+
-
2
1
24 26
N
L1
PE
Klemme 1: Orange
Klemme 2: Blå (+modstand)
Klemme 3: Hvid/blå (+modstand)
Klemme 4: Tom
OBS:
120 Ohms modstand
mellem klemme 2 & 3
1. PT 1000 sensor, behind surface (control
sensor).
2. PT 1000 sensor in front of the surface.
3. Communication cable between the
HRV unit and mounting case (10 m,
twisted pair, 2 pairs + display)
4. The power cable, 230 V, 50 Hz, should be
connected to a separate 10 A group (3 m,
3G1.5).
5. Heating surface connection (3 m 3G1.5).
6. Over-heating thermostat with
automatic re-closure (70°C).
7. The over-heating thermostat with
manual closure (120°C).
8. Element.
1.3
Positioning of an
electrical heating surface
1.4
Positioning of sensors
4
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Installation 1.0 Mounting electrical heating surfaces
Unit CCM Z-wave Air Dial
Mounting sequence – carried out on the serial socket in the ventilation unit
1.
2.
3.
Serial cables and twisted
together in pairs (same colour).
Crimp-on ferrules can be used
after twisting the two pairs
(recommended)
The twisted pairs are inserted
into the unit connector, see
point 4 for close up of collector
4.
a
b
c
d
e
f
5.
Colour code:
a. White/orange
b Orange
c. Black
d. White/blue
e. Blue
f. Remove jumper fitted over
terminals 5 and 6
Insert the connector into the
unit. After a maximum of four
minutes, the system’s Air Dial will
recognise the connected heating
surface and automatically
register it with the system.
Serial cable from CCM to the unit.
Serial cable from the heating
surface control to the unit.
External controller.
1.6
System overview
– one heating surface
connected
5
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Installation 1.0 Mounting electrical heating surfaces
Unit CCM Z-wave Air Dial
Mounting sequence
1.
2.
3.
a
b
c
d
e
f
Heating surface external
controller 1 is mounted as shown
on page 5.
Note: the termination resistance
on heating surface 1 must be
removed!
Colour code:
Cl. 1: Orange/Orange
Cl. 2: Blue/Blue
Cl. 3: White blue/white blue
Cl. 4: Empty
Colour code:
a. White/orange
b Orange
c. Black
d. White/blue
e. Blue
f. Remove jumper fitted over
terminals 5 and 6.
4.
Insert the connector into the
unit. After a maximum of four
minutes, the system’s Air Dial will
recognise the connected heating
surface and automatically
register it with the system.
Serial cable from CCM to the unit.
Serial cable from heating surface
external controller 1 to the unit.
Serial cable from heating surface
external controller 2 to control 1.
Heating controller 1,
without termination resistance.
Heating surface external controller 2,
with termination resistance.
1.7
System overview
– two heating surfaces
connected
6
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Installation 1.0 Mounting electrical heating surfaces
Symptom Possible faults Solution
The surface does not register
automatically after connection
of power to the control.
It can take up to four minutes
after a surface is connected
before it is included in the
network.
Wait four minutes and check
whether any new units have been
added to the system on the Air
Dial remote control.
A communication cable has
not been connected correctly.
Check that the communication
cables are mounted correctly and
that the colour codes between
the individual cables are as
shown in this guide.
The termination resistance is
not correctly positioned for
the last unit in the chain.
Make sure that a termination
resistance is ONLY mounted on
the last unit in the system.
The surface cuts out because
of the over-heating protection.
Flow across the surface is too
low.
Check for air passages in the
system. This type of fault is often
due to insulation material residue
in the duct system. Once the fault
has been found and corrected, the
heating surface’s over-heating
protection is re-set manually. This
is done using the red button on
the top of the heating surface.
Power to the actual ventilation
system is then switched off briefly,
after which operations can be
re-started.
Duct sensors mounted
incorrectly/wrong way round.
Check the label on the
temperature sensors; sensor
labels show where the sensor
should be placed in the system in
relation to the heating surface.
A component in the duct
system is mounted too close
to the heating surface (bend,
filter, reduction, etc.).
The component that is disrupting
the airflow across the surface
must be moved so that the
heating surface is covered evenly.
Fuses blown in main power
supply
The phase is overloaded. Supply the heating surface from a
separate 10A fused group.
Unpleasant draughts/smells Dust coating on the heating
surface
It can be expected, that an
electrical heating surface will give
off a “slightly burnt smell” when
first used (or after a long period
where it has not been in use). This
is a short-term issue and will
disappear in a short time. The
smell is due to small particles of
dust on the surface of the heating
surface getting hot.
The surface does not give off
any heat
The surface’s over-heating
protection has been triggered.
Check for any foreign objects in
the duct system. Once you have
found and corrected the fault, the
heating surface’s over-heating
protection must be re-set
manually, which is done using the
red button on the top of the
heating surface. Power to the
actual ventilation system will then
be disconnected briefly, after
which operation can be re-started.
The fuses in the surface’s
supply group have blown.
Change the fuses.
1.8
Troubleshooting table
7
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2.1
About waterborne
after heating surfaces
The waterborne after heating surfaces are
installed in the duct system on the air intake side.
The purpose of the after heating surface is to
give intake air a lower rise in temperature to
ensure against disruption in comfort or draughts
in the rooms where air is taken in.
The water heating surface is connected to the
building’s central heating system, with both flow
and return. The heating surface has inbuilt
protection against frost burst.
Note: Flow and return to the surface must be
insulated.
Installation 2.0 Mounting waterborne after heating surfaces
• The heating surface must be placed at a
minimum distance of 500 mm from any
components in the duct system (bends, any
external filters and the actual unit).
• The heating surface is fitted on the supply air
side, after the ventilation unit.
• The heating surface is insulated on delivery
and does not require any further insulation.
• Take care that the surface is facing the correct
direction in relation to the direction of airflow
in the system. The arrow on the heating
surface must match the direction of air flow
in the system.
• The heating surface is designed to be
mounted horizontally, but can also be
mounted vertically if the heating surface is
adequately supported, and if the direction of
air flow is “upwards”.
Overview table, waterborne after heating surface
+
A
B
C
D
E
F
A Extract air D Exhaust air
B Supply air E Sensor T1
C Outdoor air F Sensor T2
2.2
Positioning of a water
heating surface
• The two factory mounted PT-1000 sensors
must be placed in the duct system 50 cm in
front of and 50 cm behind the surface.
• Important! Make sure that the sensors show
where they must be placed, either in front of
or behind the surface. If the sensors face the
wrong way, the required operations cannot be
achieved.
• Drill Ø8 mm holes in the duct and install the
rubber sleeves supplied, then lead the sensors
into the duct. Fix the sensors to the pipe using
ventilation tape and insulate together with the
rest of the duct system and heating surface.
Set with direction of airflow
45 mm
Rubber sleeve.
Insulation.
2.3
Positioning of sensors
8
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Installation 2.0 Mounting waterborne after heating surfaces
2.4
Hydraulic connection
of water after heating
surfaces
• The water heating surface is connected as shown
in the below connection diagram (3/8” nipple).
• On delivery, the water heating surface’s control
valve is fully open and therefore ready for
filling, even when switched off.
• We recommend that you install a dirt trap in
the system, and that the shut-off valves be
mounted close to the surface to make any
subsequent servicing requirements easier.
• An air-bleed screw must be mounted at the
highest point in the system.
• Fill the system with water and bleed out the
air; the surface is then ready for use.
• Flow and return to the surface should be
insulated safely with regard to the frost
bursting risk.
Connection diagram, waterborne after heating surfaces
HVAC delivery supplied by others Danfoss delivery
M
A
A
B
C
D
E
F
GH
I
J
230 V
50 Hz
A Shut-off valves (recommended) F Any calls for heating are set up with a
potential-free relay
B PT 1000 sensors are mounted in the duct as
in the drawing
G Heating surface.
C Air-bleeding screw (recommended) H Control value with motor actuator
D Circulation pump (central heating system) I Dirt trap
E Expansion tank (normally already installed
in the central heating system)
J Central heating system
– maximum flow temperature 85°C
– minimum differential pressure 0.2 bar
– maximum differential pressure 4.0 bar
– maximum pressure level PN 6
9
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Installation 2.0 Mounting waterborne after heating surfaces
2.5
Electrical connection of
water heating surfaces
Once the water heating surface has been filled
with water and bled of air, it must be connected
electrically.
This is done by connecting the supplied power
plug to the heating surface and connecting the
supplied communication cable between the
water heating surface and the ventilation system.
System overview, water heating surface
Unit CCM Z-wave Air Dial
230 V, 50 Hz
Mounting sequence – carried out on the serial socket in the ventilation unit
1.
2.
3.
Serial cables and twisted
together in pairs (same colour).
Crimp-on ferrules can be used
after twisting the two pairs
(recommended)
The twisted pairs are inserted
into the unit connector, see
point 4 for close up of collector
4.
a
b
c
d
e
f
5.
6.
Colour code:
a. White/orange
b Orange
c. Black
d. White/blue
e. Blue
f. Remove jumper fitted over
terminals 5 and 6
Insert the connector into the
unit. After a maximum of four
minutes, the system’s Air Dial will
recognise the connected heating
surface and automatically
register it with the system.
Select which surface must be
used, either “Comfort” (constant
intaketemperature, usually
recommended) or
“Total heating” (rarely).
Serial cable from CCM to the unit.
Serial cable from heatingsurface
to ventilation system (supplied
with heating surface).
Water heating surface.
10
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If the central heating system is fitted with
weather compensation, it may be advisable to
set up a potential-free “call for heating”.
The call for heating is set up from the heating
surface’s control to the central heating system
through a supplementary relay (the control’s
relay output is not potential-free, and must
therefore be taken over an external relay).
The heating surface control is located behind the
steel plate on the front of the heating surface.
+
-
2
1
27 28
NO
230 V
A
B
C
D
E
A Modbus.
B “Call for heating” clamp 27/28 230 V,
4 A (not potential-free).
C Solid state relay.
D External supplementary relay (e.g. Hager
110 ES) – not included in the Danfoss
delivery.
E Clamps for external calls for heating in the
central system.
2.7
Troubleshooting table
Installation 2.0 Mounting waterborne after heating surfaces
2.6
Call for heating to the
central heating system
Symptom Possible faults Solution
The surface does not
register automatically
after power is con-
nected to the control.
It can take up to four minutes
after a surface is connected
before it is included in the
network.
Wait four minutes and check that a new
unit has been added to the system on
the Air Dial remote control.
A communication cable has
not been connected correctly.
Check that the communication cables
are correctly mounted and that the
colour codes between the individual
cables are as shown.
Termination resistance is not
correctly positioned for the
last unit in the chain (if there is
more than one unit con-
nected).
Make sure that a termination resistance
is ONLY mounted on the final unit in the
system.
The surface does not
give off any heat
Air in the system. Bleed the system.
There is no hot water from the
central heating system.
Check the central heating system, and
possibly set up a “call for heating” (see
2.6).
The dirt trap has stopped. Empty and clean the dirt trap; if
necessary flush the system.
Actuator fault. Disconnect the actuator and replace
with a new one, Danfoss AMV 130, no
082H8037.
The first time this is connected
it could take up to 20 minutes
before the valve and the
actuator are ready for
operation.
Wait for 20-30 minutes, until both the
valve and the actuator are ready for
operation.
The control is not calling for
heat.
The heating surface is not active if the
system is in away mode or if the bypass
is activated.
Pump fault. Replace the circulation pump.
11
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Installation 2.0 Mounting waterborne after heating surfaces
Air Dial issues a “frost
protection alarm”
Supply air has a temperature
lower than +5°C coming out of
the unit, before reaching the
heating surface.
Check that both valves are operational
and that air is actually flowing over
both circuits. Low temperatures are
usually due to an unintentional
blockage in the system’s duct system.
Does the building’s central heating
work? If the room temperature falls too
low, there is no energy for the system to
recover and this could also trigger a
frost protection. Heat the system again,
turn off the alarm on the remote control
and switch off power to the ventilation
system briefly; the system will then be
ready for operation again.
Supply air is not warm
enough.
Flow temperature is too low. Heatpump installations normally
operate at low supply temperatures.
You should always consider whether
this is acceptable before trying to raise
the supply temperature (as this often
results in worse/more expensive
operation of the central heating
system)
The ABQM valve’s flow
regulation is set too low.
The valve is supplied with a factory
setting of 50% (max. flow = 75 l/h) If this
is not enough, e.g. due to large volumes
of air combined with a low supply
temperature, the actuator can be
removed (the union nut is ONLY ever
tightened by hand). You now have free
access to the control valve, which can
be set to a higher value by pulling up
the grey plastic collar and then turning
it. The current value can be read from
the red indicator line on the valve
(100% = 150 l/h max. flow).
The flow is too low on the
water side.
Pressure loss to the surface is too great,
or the circulation pump is running too
low -> turn up the circulation pump and
check that all possible shut-off valves or
other throttle organs are fully open.
The control is not calling for
heat.
The heating surface is not active if the
system is in away mode, or if the bypass
is activated.
12
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Installation 3.0 Mounting geothermal surfaces
3.1
Before you start
• Before starting the digging work you will need to obtain any necessary permits from the local
building authorities! We recommend you contact a groundworks contractor and get a full
quote for the laying of ground heating pipes and leading the pipes into the building.
• The installation must be pressure tested by an authorised installer before commissioning.
• Find all relevant maps and information on the digging area and check the planned location
carefully so that no damage is done to other underground installations (water, electricity, gas,
sewage, etc.).
You can use the table below to help you decide
how many metres of pipe you need to lay for the
installation in question. You need to know the
volume of air and the soil type in order to
estimate the pipe length required.
The sandier and drier the soil is, the less heat can
be drawn from the ground, which is why more
pipes need to be laid in this type of soil than in
more normal (damper) soil.
If you are in any doubt about the type of soil you
have, you should allow for sandy soil as the extra
cost of laying a couple of additional metres will
not make any significant difference to the total
installation costs.
The volume of air for which you should allow for
is either the nominal air volume required, or a
slightly higher volume of air to allow for a better
cooling performance in the summer.
Required pipe lengths
[m3/h]
B
[m]
A
200
175
150
125
100
75
50
25
0
0 50
100 150 200 250 300 350 400
A: Dry sandy soil (15 W/m
2
)
B: Normal soil (20-30 W/m
2
)
3.2
Dimensioning
ground collectors
13
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• Ground collectors to be used are Ø40 mm PEL.
• Pipes are laid at a minimum depth of 1.5
metres.
• Pipes are laid out with a centre-to-centre
distance of 1 metre.
• The highest point of the ground collectors
circuit must be next to the building to that the
system can be bled efficiently.
• Recommended brine: mixed with ethylene
glycol or alternatively IPA (spirit) for frost
protection to a minimum of -20°C.
The illustration on the right shows the laying of
pipes in trenches:
Centre-to-centre distance ......min. 1000 mm
Depth .............................................min. 1500 mm
The pipes can also be laid in individual tracks
(not shown).
You can see below how the ground collectors
can be led into the building.
It is important that the last 1.5 metres of ground
pipe up to the building is insulated with a porous
insulation material.
Note: Flow and return to the surface must be
insulated!
Installation 3.0 Mounting geothermal surfaces
100-300mm
1500mm
A
A: Porous insulation
3.3
Laying ground collectors
14
VIFKB202
Installation 3.0 Mounting geothermal surfaces
+/-
A
B
C
D
E
F
G
H
1
H
2
I
J
K
L
M
N
O
P
Q
A: Extract air
B: Supply air
C: Exhaust air
D: Communication cable
E: Control
F: Power supply to the circulation pump.
G: Outdoor air
H
1
: Sensor T1
H
2
: Sensor T2
I: Pre-filter (accessory, recommended).
J: Condensate drain 3/8” RG A siphon must be mounted, e.g. Danfoss Air water trap (accessory).
K: Shut-off valve, not supplied by Danfoss.
L: Expansion tank, not supplied by Danfoss.
M: Bleeding screw, not supplied by Danfoss.
N: Safety valve 2.5-3 bar, not supplied by Danfoss.
O: Brine filling kit DN 20, contains 2 x shut-off valves, filling and return connectors and dirt trap.
Delivered complete and ready insulated (accessory).
P: Circulation pump 400-800 l/h, not supplied by Danfoss.
Q: Ground pipe 80-200 m
The system should be rinsed and pressure tested with water before it can be filled with brine. The
system is then drained of water and the selected brine is poured in.
We recommend that you assemble a filling kit for easy filling and possible draining of the system.
Complete, pre-assembled kits can be ordered from Danfoss under part no 086U6006 (DN 20).
The pump should be set to a flow between 400-600 l/h, depending on the length of pipe laid (the
longer the pipe, the higher the flow).
Note: the pump will be powered from the cable from the actual heating surface (pre-mounted).
3.4
Filling with brine
15
VIFKB202
Installation 3.0 Mounting geothermal surfaces
3.5
Electrical connection
System overview, geothermal surface
Unit CCM Z-wave Air Dial
230 V, 50 Hz
Mounting sequence – carried out on the serial socket in the ventilation unit
1.
2.
3.
Serial cables and are twisted
together in pairs (same colour).
Crimp-on ferrules can be used
after twisting the two pairs
(recommended)
The twisted pairs are inserted
into the unit connector, see
point 4 for close up of collector
4.
a
b
c
d
e
f
5.
Colour code:
a. White/orange
b Orange
c. Black
d. White/blue
e. Blue
f. Remove jumper fitted over
terminals 5 and 6
Insert the connector into the
unit. After a maximum of four
minutes, the system’s Air Dial will
recognise the connected heating
surface and automatically
register it with the system.
Serial cable from CCM to the unit.
The serial cable from the
geothermal surface to the
ventilation system (included with
heating surface).
Geothermal surface.
16
VIFKB202
3.6
Installation in duct
system
Installation 3.0 Mounting geothermal surfaces
• The surface is placed at a minimum distance of
500 mm from any of the components in the
duct system (bends, filters and the unit itself).
• The surface is placed on the outdoor air side,
before the ventilation unit.
• The surface supplied is already insulated and
does not require any further insulation.
• Make sure that the surface faces in the correct
direction in relation to the direction of airflow
in the system. The arrow on the surface must
match the direction of airflow in the system.
• To protect the surface from dirt, fit a Danfoss
filter box type FBDU before the geothermal
surface.
• The geothermal surface is designed to be
mounted horizontally and may ONLY be
mounted horizontally in relation to the
condensate drain. The geothermal surface
must be completely horizontal – check with a
spirit level.
• A siphon trap must be mounted to the
condensate drain, see illustration.
3.7
Positioning of sensors
• The two factory mounted PT-1000 sensors
must be placed in the duct system 50 cm in
front of and 50 cm behind the surface.
• Important! The two sensors are labelled as to
indicate their proper positioning in relation to
the geothermal surface, either before or after
the geothemal surface. If not placed correctly
the system will malfunction.
• Drill Ø8 mm holes in the duct and install the
rubber sleeves supplied, then lead the sensors
into the duct. Fix the sensors to the pipe using
duct tape and insulate together with the rest
of the duct system and heating surface.
Set with direction of airflow
45 mm
Rubber sleeve.
Insulation.
17
VIFKB202
Installation 3.0 Mounting geothermal surfaces
Symptom Possible faults Solution
The surface does not register
automatically after power is
connected to the control.
It can take up to four minutes
after a surface is connected
before it is included in the
network.
Wait four minutes and check that
a new unit has been added to the
system on the Air Dial remote
control.
A communication cable has
not been connected correctly.
Check that the communication
cables are mounted correctly and
that the colour codes between
the individual cables are as
shown in this guide.
Termination resistance is not
correctly positioned for the last
unit in the chain (if there is
more than one unit connected).
Make sure that a termination
resistance is ONLY mounted on
the final unit in the system.
The surface does not give off
any heat (winter operation) or
does not cool (summer
operation)
Air in the system. Bleed the system.
Not enough brine is flowing
through the system.
Examine and clean any dirt traps
in the system. Check that the
pump is running; if necessary turn
up the pump.
The control is not calling for
heat/cooling.
The geothermal surface is
normally active at outside
temperatures below freezing
(pre-heating) and at high outside
temperatures during the
summer, when cooling is
required. In the intervening
periods the geothermal surface
is often not needed so the pump
will not be active at these times.
Supply air is not cold enough
(summer operations).
Note! The expected intake air
temperature on a summer’s
day is around 14-17°C,
depending on the length of
piping and the soil conditions
at the groundworks.
Air in the system. Bleed the system.
The flow the pump is supply-
ing is too low.
Check that any valves in the brine
circuit are fully open, or turn up
the pump.
Poor/missing insulation of
brine pipes in the building and
fresh-air intake for the unit.
Insulate brine pipes and fresh-air
intake to avoid losing cooling
performance from the system.
3.8
Troubleshooting table
18
VIFKB202
Installation 4.0 Technical data
4.1
Technical data
• Water heating surface
W-AH 250
• Geothermal surface Geo
250
Dimensions, L x W x H 600 x 250 x 335 mm
Weight 6.6 kg
Connection, air Ø250
Connection, water 3/8” RG, nipple
Box Highly insulated, fire-resistant EPS shell (U-factor 0.8)
Max. heating surface (400 m
3
/h, temp. 70/40/20°) 2,350 W
Installation Horizontal
Max. water flow 150 l/h
Pressure loss curve for the air side, water heating surface W-AH 250 & geothermal surface Geo 250
25 50 75 100 125 150 175 200 250 275 300 325 350 3750 400 425 450 475 500
Flow
[m
3
/h]
[Pa]
5
10
15
20
25
30
35
40
45
50
55
60
65
70
Pressure loss curve for the water/brine
side, water heating surface W-AH 250 &
geothermal surface Geo 250
Flow [l/h]
100 200
300 400 500 600 700 800
70
60
50
40
30
20
10
[KPa]
Power output curve for the air side
– water heating surface
[W]
1
2
3
4
8
7
6
5
0 50 100 150 200 250 300 350 400 450
Flow [m
3
/h]
3400
3000
2600
2200
1800
1400
1000
600
200
70/40/20
50/40/20
19
VIFKB202
Installation 4.0 Technical data
Type Ø125 Ø160 Ø250
Dimensions, Ø x L Ø125 x 375 mm Ø160 x 375 mm Ø250 x 375 mm
Weight 2.4 kg 3.2 kg 4.6 kg
Connection, air Ø125 Ø160 Ø250
Max. output 900 W 1500 W 2100 W
Box Galvanised steel plate
Safety thermostat Double, built-in
– automatic re-closure at 70°C
– manual re-closure at 120°C
Pressure loss curves for electrical heating surfaces (both pre-heating and after heating surfaces)
Flow
[m
3
/h]
Ø250
Ø125
Ø160
[Pa]
8
7
6
5
4
3
2
1
0
0 50 100 150 200 250 300 350 400 450 500
4.2
Technical data
• Electrical heating
surface EL-PH & EL-AH
20
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Danfoss Heating Surfaces Installation guide
- Type
- Installation guide
Danfoss Heating Surfaces are designed to provide efficient and reliable heating solutions for a variety of applications. These surfaces can be used for pre-heating or after-heating air in ventilation systems, ensuring optimal comfort levels and preventing freezing in cold climates. With their advanced features, Danfoss Heating Surfaces offer precise temperature control, energy efficiency, and ease of installation. Whether you need to maintain a comfortable indoor temperature or prevent frost formation, Danfoss Heating Surfaces provide a versatile and effective solution.
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