Danfoss Termix VVX-I-R FI - 7 Series User manual

© Danfoss | 2021.06 LGB40450
Termix VVX-I-R FI - 7 Series DS fully insulated
Operating Guide

2 | © Danfoss | 2021.06 LGB40450
Termix VVX-I-R FI - 7 Series DS fully insulated
Table of contents
Introduction..................................................................... 3
Warranty and product liability ...................................... 3
Glossary of technical terms............................................ 4
Key to symbols................................................................. 4
Materials .......................................................................... 4
Unit label.......................................................................... 5
Functional specification ................................................. 6
Personal protective equipment...........................................................6
Warning of dangerous situations that can arise with reasonably
foreseeable misuse...................................................................................6
Safety notes ..................................................................... 7
Handling, transport and storage................................... 8
Handling.......................................................................................................8
Transport and storage.............................................................................8
Assembly, installation and commissioning.................. 8
Unpacking and preparation..................................................................8
Lifting instructions ...................................................................................9
Dismantling the insulation front.......................................................10
Mounting and installation ...................................................................11
Commissioning........................................................................................11
Design .........................................................................................................12
Schematic description - Termix VVX-I-R FI RAD ..........................13
Schematic description - Termix VVX-I-R FI UFH...........................14
Electrical connections and wiring ....................................................15
Wiring diagram - radiator heating....................................................16
Wiring diagram - underfloor heating..............................................16
Fitting of energy meter.........................................................................17
Filling of the primary heating system .............................................18
Filling of the secondary heating system ........................................19
Start-up...................................................................................................... 20
Underfloor heating ............................................................................... 20
Operating Guide - Components................................... 21
Heating controls............................................................ 21
Thermoactuators ....................................................................................21
RAVK controller (35-75 °C)....................................................................21
Differential pressure controller......................................................... 22
Circulator pump UPM3 ........................................................................ 22
Grundfos UPM3 AUTO instructions................................................. 23
IMIT Thermostat ......................................................................................24
Safety valve ...............................................................................................24
Waste adaptor..........................................................................................24
DHW Temperature control ........................................... 25
Pressure absorber .................................................................................. 25
DHW Re-circulation............................................................................... 25
Maintenance .................................................................. 27
Troubleshooting............................................................ 28
Troubleshooting..................................................................................... 29
Deactivation and dismantling ..................................... 30
Disposal.......................................................................... 30
Declaration of conformity ............................................ 31
Pre hand over check list................................................ 32

© Danfoss | 2021.06| 3LGB40450
Termix VVX-I-R FI - 7 Series DS fully insulated
Introduction
This heat interface unit is intended for connecting to a heat network
for the production of both domestic hot water and space heating.
Read through the instructions before starting installation work.
Pay particular attention to the safety precautions.
The manufacturer assumes no responsibility for failure to follow the
instructions. This applies to both personal injury and product damage.
The following operating conditions must be carried out in accordance
with the directions below:
Assembly, installation and commissioning
General assembly, installation and commissioning must be
carried out by a qualified and authorised HVAC technician.
All electrical connections must be carried out by an authorised
electrician.
Daily operations
After correct installation and commissioning, under
normal circumstances further adjustment of the unit
will not be necessary.
Maintenance and cleaning
Regular maintenance of the heat interface unit is shown
in the section “maintenance”. This section also describes
the cleaning procedures.
Dismantling
Dismantling the heat interface unit must be carried
out by an authorised and qualified HVAC technician.
For further information regarding disposal,
please refer to the section “disposal”.
Warranty and product liability
Danfoss A/S’ area of responsibility does not include balancing,
scope of works or mounting and correct connection of the unit.
If changes are carried out to the heat interface unit’s configuration
or structure, the manufacturer can assume no responsibility.
The warranty does not cover incorrect use of the product.

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Termix VVX-I-R FI - 7 Series DS fully insulated
Key to symbols
Glossary of technical terms
DHW Domestic hot water
DCW Domestic cold water
HWC Hot water circulation
DHF Heat network supply
DHR Heat network return
HFL Heating supply
HRL Heating return
Materials
Corrosion protection
All pipes and components are manufactured in stainless steel and brass.
The chloride content in the flow medium should not exceed 150 mg/l.
The risk of corrosion increases significantly if the recommended chloride
content is exceeded.
REACH
All products from Gemina Termix A/S meet the requirements in REACH.
One of the requirements in REACH is to inform customers of any content
of materials on the REACH candidate list. We hereby inform customers
of a material on the candidate list. The product contains brass parts,
which contain lead (CAS no: 7439-92-1) in a concentration over 0.1% w/w.
Heat network
Radiator heating
Underfloor heating
Hot water tank
Domestic hot water
Domestic cold water
Hot water recirculation

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Termix VVX-I-R FI - 7 Series DS fully insulated
Unit label
The unit label is affixed to the back plate
(Image of a unit label is shown as an example).
Should the unit label become unreadable, damaged or fall off completely,
then it must be replaced.
New unit label can be ordered.

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Termix VVX-I-R FI - 7 Series DS fully insulated
Functional specification
The heat interface unit is intended for connecting to a heat network
for the production of both domestic hot water and space heating.
The unit must be connected to the household installation in a frost-free
location.
Technical specifications
Specifications:
Max. working pressure: See the unit label on the heat interface unit
Max. temperature: See the unit label on the heat interface unit
Power connection: 230 V
Sound level: ≤ 55 dB
Ambient temp: 0 - 40°C
(in continuous use)
Dimensions for connections:
DHF + DHR + HFL + HRL + DCW + DHW: G ¾” (internal thread)
Weight:
Net weight: Approx. 28 kg
Dimensions:
Dimensions: H 690 mm x W 530 mm x D 235 mm
The recommended operational parameters must not be exceeded.
Gloves
It is recommended that suitable work
gloves are used in connection with
handling and lifting of the heat interface
unit.
Personal protective equipment
Warning of dangerous situations that can arise with reasonably foreseeable misuse
The risk of personal injury or product damage increases considerably
if the recommended operational parameters are exceeded.
The unit must always be equipped with safety valves in accordance
with local regulations.

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Termix VVX-I-R FI - 7 Series DS fully insulated
Safety notes
Authorised personnel
Assembly, installation, commissioning and maintenance must
only be carried out by a qualified and authorised HVAC or electrical
technician.
Read the instructions before start-up
The instructions must be read through before installation
and commissioning of the unit. Pay particular attention
to the section on safety precautions.
The manufacturer assumes no responsibility for failure to follow
the instructions. This applies to both personal injury and product
damage.
Installation requirements
The unit must be connected to the household installation
in a frost-free location.
Hanging and fastening
It must be ensured that both the wall and the fastenings
of the unit can bear the unit’s gross weight.
Heat source
The unit is designed for connection to heat network.
An alternative energy source can be used as long as the operating
conditions are equivalent to heat network at all times.
Handling
All lifting and handling of the heat interface unit must be carried
out in an ergonomically responsible manner.
Lifting the unit
When lifting the heat interface unit, only lift by the pipes that
are fixed to the back plate. Otherwise, to the extent possible,
the heat interface unit must be lifted by the back plate.
Please refer to the section “Lifting instructions”.
Re-tightening
As the unit has been subjected to vibrations during transport and
lifting/handling it is important that all union connections are re-
tightened.
After filling the system with water and once it is in operation,
all union connections must be re-tightened again.
Modifications
Modifications to the electrical connections on the heat interface
unit may only be carried out by an authorised electrician.
If changes are carried out to the heat interface unit’s configuration
or structure, the manufacturer can assume no responsibility.
Resistance to water on electrical equipment
Electrical components are not protected against water ingress.
Safety valve
A safety valve(s) must always be fitted in accordance with local
regulations.
Connection
The possibility to shut off all energy sources to the heat interface unit
at all times must be established, including the electrical connection.
It must be ensured that wires and cables do not come into contact
with the hot pipes. It must also be ensured that wires and cables are
not placed against sharp edges.
Warning of high pressure and temperatures
Particular attention must be given to the installation’s permitted
system pressure and operating temperature.
The maximum permitted flow temperature and pressure are stated
on the unit label.
The risk of personal injury or product damage increases considerably
if the recommended operational parameters are exceeded.
Warning of hot surfaces
Particular attention must be given to hot surfaces, as these can cause
burns to the skin.
Warning of sharp edges
It is recommended that suitable work gloves are used in connection
with handling and lifting of the heat interface unit.

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Termix VVX-I-R FI - 7 Series DS fully insulated
Handling, transport and storage
Handling
All lifting and handling of the heat interface unit must be carried
out in an ergonomically responsible manner.
Transport and storage
The unit must be properly packed during both transit and storage.
Transport temperature: -10 to +65°C
Storage temperature: +10 to +65°C
When storing the unit prior to installation, it must be stored in a dry,
heated place.
If more units are supplied at the same time, they must never be stacked
higher than they were at the factory.
Assembly, installation and commissioning
Unpacking and preparation
Remove the packaging from the unit.
Cling film and cardboard must be disposed of in accordance with locally
applicable legislation.
Authorised personnel
Assembly, installation and commissioning must only be carried
out by an authorised HVAC technician.
Lifting the unit
When lifting the unit out of the cardboard box, only lift by the pipes
that are attached to the back plate.
Otherwise, to the extent possible, the heat interface unit must
be lifted by the back plate.
In connection with assembly, the unit must be lifted according
to the section “lifting instructions”.
Warning of transport damage
Before installing the unit, check to ensure the product has not been
damaged during transit.

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Termix VVX-I-R FI - 7 Series DS fully insulated
Temporarily remove the U-shaped front
Unhook and secure the front
Lift the heat interface unit in the following
two places:
1. On the left hand side around the primary
strainer.
2. On the right hand side around the T-piece
below the energy meter.
Now, hang the heat interface unit onto bolts
in the wall.
Lifting instructions

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Termix VVX-I-R FI - 7 Series DS fully insulated
Dismantling the insulation front
Temporary securing of centre plate
Disassembly of the side frame

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Termix VVX-I-R FI - 7 Series DS fully insulated
Mounting and installation
Hanging and fastening
It must be ensured that both the wall and the fastenings of the unit
can bear the unit’s gross weight.
Please refer to the section “Technical specifications”.
Re-tightening
As the unit has been subjected to vibrations during transit it is
important that all screw fittings are re-tightened.
The existing installation should be flushed out prior to installation.
Follow the symbols indicated on the heat interface unit for correct
connection of the pipes. Please refer to the section “Key to symbols”.
Adequate space
Please allow adequate space around the heat interface unit for mounting
and maintenance purposes.
Orientation
The unit must be mounted so that components, keyholes and labels are
placed correctly. If you wish to mount the unit differently please contact
your supplier.
Tightening
Due to vibrations during transit, lifting and handling all heat interface unit
connections
must be checked and tightened before installation.
Strainer
If a strainer is supplied with the heat interface unit it must be fitted
according to schematic diagram. Please note that the strainer may
be supplied loose.
Installation must comply with local standards and regulations.
Re-tightening
After filling the system with water and once it is in operation,
all union fittings must be re-tightened.
Commissioning
Before start-up check that:
• Pipes are connected in accordance with the symbols indicated on the
heat interface unit.
• Then slowly open the isolation valve(s) so that the heat interface unit
fills with water.
• Ensure that all union fittings and swivel nuts have been re-tightened.
• The heating circuit must be vented before commissioning.
• Monitor the heat interface unit’s operation in regard to temperature,
pressure, thermal expansion and leaks.
• Provided the heat interface unit functions in accordance with the
dimensioning regulations, it can be put into use.

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Termix VVX-I-R FI - 7 Series DS fully insulated
Design
A Heat exchanger, HE 10 Circulator pump 48 Air vent, manual
B Heat exchanger, DHW 14 Sensor pocket, energy meter 54 Energy meter
M Electrical wiring box 20 Filling/drain valve 62B Pressure Absorber with non-return valve
2B Double check valve, WRAS 31 Differential pressure controller 63 Sieve
4 Safety valve 38 Expansion tank 69 On/off valve
7 Thermostatic controller, HE 41B Fitting piece, energy meter 74 IHPT controller, DHW
9 Strainer 41C Fitting piece, Shut-off-valve
Your heat interface unit may look different from the heat interface unit shown
Heating flow and return pipes will be fitted as top feed or bottom feed, according to specification

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Termix VVX-I-R FI - 7 Series DS fully insulated
Schematic description - Termix VVX-I-R FI RAD
A Heat exchanger, HE 9 Strainer 41B Fitting piece, energy meter
B Heat exchanger, DHW 10 Circulator pump 41C Fitting piece, Shut-off-valve
L Border of delivery 14 Sensor pocket, energy meter 48 Air vent, manual
M Electrical wiring box 20 Filling/drain valve 62B Pressure Absorber with non-return valve
1 Isolation valve 26 Pressure gauge 63 Sieve
2B Double check valve, WRAS 31 Differential pressure controller 69 On/Off valve
4 Safety valve 38 Expansion tank 74 IHPT controller
7 Thermostatic valve 39 Connection closed
Your heat interface unit may look different from the heat interface unit shown
Heating
Supply
Heating
Return
Domestic
Hot water
Domestic
Cold water
Heat network
Supply
Heat network
Return
Mounting rail

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Termix VVX-I-R FI - 7 Series DS fully insulated
Schematic description - Termix VVX-I-R FI UFH
A Heat exchanger, HE 10 Circulator pump 41C Fitting piece, Shut-off-valve
B Heat exchanger, DHW 14 Sensor pocket, energy meter 48 Air vent, manual
L Border of delivery 20 Filling/drain valve 60 Thermostat (only for under floor heating)
M Electrical wiring box 24 Delivered loose with unit 62B Pressure Absorber with non-return valve
1 Isolation valve 26 Pressure gauge 63 Sieve
2B Double check valve, WRAS 31 Differential pressure controller 69 On/Off valve
4 Safety valve 38 Expansion tank 74 IHPT controller
7 Thermostatic valve 39 Connection closed
9 Strainer 41B Fitting piece, energy meter
Your heat interface unit may look different from the heat interface unit shown
Heating
Supply
Heating
Return
Domestic
Hot water
Domestic
Cold water
Heat network
Supply
Heat network
Return
Mounting rail

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Termix VVX-I-R FI - 7 Series DS fully insulated
Electrical connections and wiring
Before connecting the unit to an electrical supply, please note the
following:
Safety notes
Please read the relevant parts of the safety notes.
230 V
The heat interface unit must be connected to 230 V AC and earth.
Potential bonding
Potential bonding should be carried out according
to DS/HD 60364-4-41:2007 and IEC 60364-5-54:2011.
The bonding point is located on the bottom of the mounting plate in the
right corner and marked with an earth symbol.
Disconnection
The electrically connected heat interface unit must be disconnected for
repairs.
Authorised personnel
All electrical installation work may only be carried out by an
authorised electrician.
The electrical connection must be carried out in accordance
with applicable legislation and local standards.
It must be ensured that wires and cables do not come into contact
with the hot pipes. It must also be ensured that wires and cables
are not placed against sharp edges.

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Termix VVX-I-R FI - 7 Series DS fully insulated
Wiring diagram - underfloor heating
Wiring diagram - radiator heating

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Termix VVX-I-R FI - 7 Series DS fully insulated
Fitting piece
The heat interface unit is equipped with a fitting piece for the energy
meter.
Mounting the energy meters:
• Close isolation valves
Close the isolation valves on DH Supply and DH Return, if there is water
in the system.
• Loosen nuts
Loosen the nuts on the fitting piece.
• Remove fitting piece
Remove the fitting piece and replace it with the energy meter. Don´t
forget the gaskets.
• Tighten connections
After mounting of the energy meter, remember to check and tighten all
threaded connections.
Sensor pocket
The sensors of the energy meter is mounted in the sensor pockets.
41
see diagram
14
see diagram
Fitting of energy meter

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Termix VVX-I-R FI - 7 Series DS fully insulated
Filling of the primary heating system
A flushing bypass or similar should be mounted.
Only introduce heating network water in the HIU once it has been flushed.
1. First fill
When carrying out the first fill, the heat exchanger must be slowly filled
with water until it reaches working pressure.
2. Pressure gauge
The HE pressure gauge indicates the pressure of the HE system. This
instruction must be followed strictly to avoid dangerous situations.
3. Supply hose
An isolation valve with plug is installed in the HE return line. To fill the
system, the isolation valve must first be closed, the plug removed and
a supply hose connected. On re-opening the isolation valve, system fill
can commence.
4. Pre-pressure
The expansion vessel is supplied prepressurised to 0.5 bar.
The pre-pressure required for the individual heat interface
unit will depend on system head (the distance between
t h e l o w e s t a n d h i g h e s t p o i n t i n t h e s y s t e m ) , f o r e x a m p l e :
5. Filling stop
When filling the system with water, the pressure gauge should be
observed closely. Filling must stop when the pressure gauge shows a
pressure approximately 1-2 bar higher than the pre-pressure setting. The
isolation valve is then closed, the hose removed and the plug replaced.
Height (m) Presssure (bar)
0-5 0,5
5-10 1,0
10-15 1,5
15-20 2,0
Re-tighten connections
After water has been added to the system and the system has been
put into operation, re-tighten ALL constructions.
26
see diagram

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Termix VVX-I-R FI - 7 Series DS fully insulated
Filling of the secondary heating system
Step 1:
Remove the front and centre plate.
Step 2:
Remove the cap and connect the flexible hose.
Step 3:
Open both valves.
Step 4:
After filling up the secondary heating system, close both valves,
disconnect the flexible hose and refit the insulation.
4
2

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Termix VVX-I-R FI - 7 Series DS fully insulated
Underfloor heating
Pump stop function
If the heat interface unit is used in connection with underfloor heating,
the circulation pump must be connected to the pump stop function in the
underfloor heating controller. The pump must be stopped if all underfloor
heating circuits are closed.
Warranty
If this is not possible, then flow must be continued through the by-pass.
Failing this, the pump will be at risk of seizure and any remaining warranty
is forfeited.
1. Pump speed
Set the pump to its highest speed before start-up.
2. Start pump
Start the pump and heat through the system.
Remark:
The circulator pump should run for 10 minutes during the first installation.
3. Open isolation valves - primary
The isolation valves should then be opened and the unit observed as it
enters service. Visual checking should confirm temperatures, pressures,
acceptable thermal expansion and absence of leakage. If the heat
exchanger operates in accordance with design, it can be put into regular
use.
4. Vent system
Switch off the pump and vent the installation after the radiators have
warmed up.
5. Check the strainer
Check strainer on heating and DHW underfloor heating.
Strainers should be cleaned regularly by authorized personnel.
The frequency of cleaning will depend on operating conditions.
Start-up
Pump
The pump must be switched off during system filling.
09
see diagram