Danfoss Akva Lux TDP Operating instructions
- Type
- Operating instructions
Instructions
Akva Lux TDP
District heating flat station for direct heating
and domestic hot water systems
DH-SMT/PL
VI.KR.N1.02 © Danfoss 09/2006 1
Akva Lux TDP
Table of contents Akva Lux TDP .................................................. 1
Table of contents ............................................ 1
Safety notes .................................................... 2
Delivery ........................................................... 2
Transport and storage ...................................2
Mounting ........................................................ 3
Pipes connections ............................................4
Electrical connection ........................................4
Filling, start-up ................................................. 4
Control ............................................................ 4
Maintenance ................................................... 7
Troubleshooting DHW ................................... 8
Troubleshooting HE ....................................... 9
Akva Lux TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.N1.02 © Danfoss 09/20062
Safety notes
Following instructions refer to the standard
design of the Akva Lux TDP flat station.
Special versions of flat stations are available
on request.
To avoid injury of persons and damages to the
device, it is absolutely necessary to carefully read
and observe these instructions.
Necessary assembly, start-up and maintenance
work must only be performed by qualified and
authorized personnel.
Please comply with the instructions of the system
manufacturer or system operator.
Unused connections and shut-off valves must be
sealed with a plug. The plugs can be removed by
an authorized service technician only.
Warning of high pressure and temperature
The maximum temperature of the flow medium in
a flat station is 90 °C.
The maximum operating pressure of the flat station
is 16 bar.*
* With built-in zone valve 10 bar
Be aware of the installation’s permissible system
pressure and temperature.
The risk of persons being injured and equipment
damaged increases considerably if the
recommended permissible operating parameters
are exceeded.
The flat station installation can be equipped with
safety valve, however, always in accordance with
local regulations.
Warning of hot surface
The flat station has got hot surfaces, which can
cause skin burns. Please be extremely cautious in
close proximity to the flat station.
Warning of transport damage
Before installation of flat station, please make sure
that the flat station has not been damaged during
transport.
Sound level
≤ 55 dB
Corrosion protection
All pipes and components are made of stainless
steel and brass.
The maximum chloride compounds of the flow
medium should not be higher than 300 mg/l.
The risk of equipment corrosion increases
considerably if the recommended permissible
chloride compounds are exceeded.
Delivery The Akva Lux TDP flat station is delivered without
cover as a standard.
Optional flat station equipment:
- safety valve and non-return valve (DCW),
- fitting piece and connections pipe for DCW
meter,
- thermostat 10/50 °C for by-pass control (DH),
- connection pipe for circulation with adjustable
setting of DHW circulation,
- electronic programmable room thermostat,
- zone valve with actuator,
- ball valves, all connections G ½“ or G ¾”,
- heat meter (DH supply),
- air screw (DH supply),
- white-lacquered steel sheet cover.
Standard delivery:
The flat station is prepared for by-pass or DHW
circulation control. Equipment for by-pass or DHW
circulation control is optional and must be ordered
separately.
In case of DHW circulation control remember to
mount circulation pump and non-return valve
(this is not part of the delivery and must be fitted
remotely on site).
Transport and storage If the flat station is stored before installation in a
warehouse or any other room, make sure that the
place is dry and heated.
During transport of the flat station to an installation
place it is recommended to lift it with special straps
attached to the bottom (by flat station support
construction).
Instructions
DH-SMT/PL
VI.KR.N1.02 © Danfoss 09/2006 3
Akva Lux TDP - district heating flat station for direct HE and DHW
Mounting
The flat station must be installed and connected
by authorized service personnel.
Installation must be in compliance with the local
standards and regulations.
Allow for adequate space around the flat station
for mounting and maintenance purposes.
Prior to the Akva Lux TDP installation all flat station
pipes and connections should be cleaned and
rinsed.
Due to vibrations during transport all connections
must be checked and tightened before the flat
station is installed.
The picture shows Akva Lux TDP flat station with
by-pass control. Switching to DHW circulation
control is possible from a constructional point of
view, requiring only an additional connection pipe
incl. fittings.
Control change from by-pass to circulation
- Loosen nut (1) on the left-hand side of brass
connection piece between PT°C controller and
plate heat exchanger, remove blind plate and
mount connection pipe for circulation (optional
feature).
- Remove conical screw (2) (4 mm) on the
right-hand side of the brass connection piece
between PT°C controller and plate heat
exchanger.
- Loosen and move capillary tube with union nut
from pos. 3 (back of T-piece) to pos. 2.
- Screw the conical screw from pos. 2 (4 mm) on
to the muff at pos. 3.
- Connect DHW circulation system with
connection pipe for circulation.
- Remember pump assembly and non-return
valve mounting in the DHW circulation system
(not part of the delivery).
The pump must pump water in direction towards
the flat station.
Heat meter assembly, fitting piece
The flat station is equipped with a fitting piece for
insertion of heat meter.
Assembly of heat meter
- Loosen nuts from fitting piece, remove fitting
piece and replace with heat meter.
- Mount the heat meter according to the medium
flow direction. After mounting of heat meter
remember to check all threaded connections.
DCW meter
As an option the flat station can be equipped with a
fitting piece and connection pipe for DCW meter.
Assembly of DCW meter
Please refer to above assembly instructions for heat
meter.
1
2
3
1 2
3
Akva Lux TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.N1.02 © Danfoss 09/20064
Pipes connections
Internal installation and district heating* pipes
connections must be made by means of flanged,
threaded or welded connections.
Connections:
1 District heating (DH) supply
2 District heating (DH) return
3 Domestic cold water (DCW)
4 Domestic hot water (DHW)
5 Heating (HE) supply
6 Heating (HE) return
7 DHW circulation - optional
8 Domestic cold water (DCW)**
** if DCW meter is mounted:
3 DCW - outlet
8 DCW - inlet
Connection sizes:
DH + DCW + DHW + HE: G ½” or G ¾”
(ext. thread)
Optional DHW circ.: G ½” (ext. thread)
Dimensions (mm):
Without cover: H 470-590 x W 360 x D 270
With cover: H 490-590 x W 410 x D 320
* District heating (DH) - In the following
DH is specified as the heat source for the
substations. However, also other heat sources
such as an oil or gas boiler or solar heating
etc. could be used as the primary supply for
the fitted substations, enabling the Danfoss
Redan substations to be used in numerous
schemes with different energy sources,
depending on the local operating conditions.
In order to simplify we have decided to use
DH as designation for the primary supply.
Electrical connection The flat station needs no electrical installation to
the main supply or earth grounding.
Filling, start-up Prior to the Akva Lux TDP installation all its pipes
and connections should be cleaned and rinsed.
Before starting-up, check if:
- pipes are connected according to the circuit
diagram,
- release valves are shut-off,
- threaded and flanged connections are
tightened.
The heat exchanger must be filled with water
so that the pressure slowly reaches the working
pressure.
After that the shut-off valves should be opened
and the operation of the heat exchanger must be
observed (e.g. temperatures, pressure, thermal
expansion, leakages). If the heat exchanger
operates unproblematically, it can be taken into
a continuous use.
All Danfoss heat exchangers and flat stations have
been pressure tested prior to delivery.
Instructions
DH-SMT/PL
VI.KR.N1.02 © Danfoss 09/2006 5
Akva Lux TDP - district heating flat station for direct HE and DHW
Control
1. Differential pressure controller
The differential pressure controller reduces the
fluctuating pressure in the district heating network
to a small and invariable operating pressure in
the flat station. The required room temperature
is controlled on your radiator thermostats (fixed
setting throughout the year). It is recommended that
all radiators are opened a little in each room.
The flat station can be equipped with dp controller
type TD200 or AVPL, depending on customer
demand.
TD200
The differential pressure controller is preset from
factory and should not be adjusted afterwards.
AVPL
The AVPL must be mounted in the return. The dp
controller can be set at any differential pressure
between 5 kPa and 25 kPa (0,05 bar and 0,25 bar).
The dp controller is preset on 10 kPa (0,1 bar) and
can be adjusted afterwards.
2. HE temperature control
The HE temperature in the house is controlled by
radiator thermostats. As an option the Akva Lux
TDP flat station can be equipped with an electronic
programmable room thermostat and a zone valve
with actuator. In this case temperature is controlled
by the room thermostat and radiator thermostats.
Please note that the room thermostat keeps the
temperature in the whole apartment according
to setting room parameters. Consult additional
maintenance instructions for room thermostat for
further information. It is recommended to avoid
fully opened thermostats on some radiators and
fully shut-off on others. Higher temperature at the
top and lower temperature at the bottom part
of radiators means that the system operation is
correct. To keep correct temperature and friendly
microclimate for human beings in the apartment,
it is recommended to ensure regular airing in
rooms.
3. DHW temperature control
The DHW temperature is controlled by a combined
hydraulic and thermostatic valve – the PT°C
controller. The DHW temperature control is made
by turning the controller head to a higher (warmer)
or lower numerical value (colder). The temperature
should be set to 45-48 °C at normal use (8-10 l/
min). The temperature should never exceed
55 °C to avoid lime scale precipitation in the heat
exchanger.
PT°C controller
Approximate PT°C controller settings:
1 = 25 °C 4 = 55 °C
2 = 35 °C 5 = 65 °C
3 = 45 °C 6 = 75 °C
Setting changes:
Set the temperature by turning the controller
head.
Akva Lux TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.N1.02 © Danfoss 09/20066
Thermostatic by-pass (optional)
As an option the flat station can be equipped
with a by-pass thermostat, Danfoss FJVR, which
ensures that hot water is available immediately
when tapping starts. It is recommended to set
the thermostat in pos. 3. If the water temperature
rises too slowly it can be necessary to set the
thermostat at higher value, however, not higher
than in position 4.
DHW circulation (optional)
As an option the flat station can be equipped with
connection pipe for circulation with adjustable
setting of DHW circulation. If the Akva Lux TDP
flat station is connected to the DHW circulation
system in the building, the thermostat will control
the DHW circulation temperature. This ensures that
hot water is available at the tap point without any
waiting time and water waste. It is recommended
to set the thermostat in pos. 2-2,5. If the circulation
pump is switched off, the thermostat should be
closed. In case the Akva Lux TDP flat station has
been delivered with by-pass control and this must
be changed to DHW circulation control, this can be
done by performing control change from by-pass
to circulation, as described on page 3.
Approximate thermostat scale setting:
I = 10 °C
1 = 20 °C
2 = 30 °C
3 = 40 °C
4 = 45 °C
I = 50 °C (max. temp.)
4. Safety valve (optional)
The safety valve’s task is to protect the flat station
from pressures exceeding the permissible pressure.
The blow-off pipe of the safety valve must not be
closed. The blow-off pipe outlet should be placed
so that it provides safety relief and it is possible to
observe water dropping from the safety valve. It
is advisable to check the operation of the safety
valve by turning the valve head into the indicated
direction, every six months.
5. Filters
Filters should frequently be cleaned from sediments
by authorized personnel, according to producer’s
instructions and depending on the flat station’s
operating conditions.
Instructions
DH-SMT/PL
VI.KR.N1.02 © Danfoss 09/2006 7
Akva Lux TDP - district heating flat station for direct HE and DHW
Maintenance
It is necessary to check and maintain the flat
station on a regular basis in order to keep it in
good operating condition.
The frequency of the maintenance and service
inspections should be according to system
manufacturer specifications and local legislation.
However, maintenance inspections should take
place at least twice each year (before and after the
heating season).
In addition to the check of the flat station as to its
functionality, it is also recommended to check if the
following system parameters are compliant with
the requirements of the system manufacturer and
local regulations:
- no leakages,
- correct temperatures in the distribution
network,
- stable district heating supply and return
temperatures,
- correct cooling of the district heating supply,
- DHW temperature (requested temperature
should be in accordance with the local
regulations),
- pressure drops in filtering and water
conditioning plants (filters, sludgers etc.),
- pressure drops in the heat exchanger (primary
and secondary side of the heat exchanger).
The flat station operator should consider the above
parameters and prepare written maintenance
reports.
Service inspections by authorized personnel
are usually more precise (complex) than user
maintenance inspections and the intervals between
them are longer.
Akva Lux TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.N1.02 © Danfoss 09/20068
Troubleshooting
DHW
Problem Possible cause Solution
In general: Does the PT°C
controller work incorrectly?
If the quantity of tap water is normal
(temperature unimportant), it
indicates that the PT°C controller
works correctly.
Locate defect in another part
of the installation.
In general: Are the operating
conditions satisfactory?
The flat station requires a primary
flow temperature of minimum
60 °C and a differential pressure
during operation according to the
information stated in the product
sheet for Akva Lux TDP.
Contact district heating
supplier.
PT°C controller leaking.
One of the two O-rings is defective
(does not influence the PT°C control
function). If a non-return valve is
installed in the DCW inlet (e.g. in
the house service connection or in
DCW meter) a safety valve should be
mounted between the non-return
valve and the DHW heat exchanger.
Replace PT°C controller (use
new sealing).
DHW tap load too low.
The diaphragm of the PT°C
controller is defective.
Replace diaphragm
or PT°C controller.
DHW tap load too low;
Tap temperature too low;
Tap temperature fluctuates.
PT°C controller wrongly adjusted.
Strainer in DH flow clogged.
Defective non-return valve in
thermostatic battery (check if DHW
tap temperature is lower than DHW
from flat station, or close ball valve
on DCW inlet for flat station).
Defective non-return valve in DHW
circulation (DHW circulation return
pipe is getting cold during tapping
of hot water).
Lime scale precipitation in DHW
plate heat exchanger (∆t primary too
low during DHW tapping).
Dirt in PT°C controller.
See PT°C controller
instructions.
Clean strainer.
Clean or replace non-return
valve.
Clean or replace non-return
valve.
Replace plate heat
exchanger.
Cleaning, see PT°C controller
instructions
DHW temperature too high
PT°C controller wrongly adjusted
Thermostatic element in PT°C
controller defective
See PT°C controller
instructions
Replace PT°C controller
System with DHW circulation:
DHW temperature falls
shortly after tapping has
started.
Bypass thermostat is defective or
wrongly adjusted.
Replace or adjust bypass
thermostat correctly.
DH return water temperature
too high while on standby.
The plate heat exchanger is
cold….
Bypass thermostat is defective or
wrongly adjusted.
Replace or adjust bypass
thermostat correctly.
DH return water temperature
too high while on standby.
The plate heat exchanger is
hot….
Dirt (sand, iron splinter or similar) in
PT°C controller. Controller does not
close after tapping. Noise from flow
can often be heard.
Disassemble the controller
for cleaning. See PT°C
controller instructions.
DH return temperature
too high during hot water
tapping (poor cooling).
The DHW temperature is set too
high and/or lime scale precipitation
in the DHW plate heat exchanger.
Set PT°C controller in correct
position (see PT°C controller
instructions) and/or replace
plate heat exchanger.
Instructions
DH-SMT/PL
VI.KR.N1.02 © Danfoss 09/2006 9
Akva Lux TDP - district heating flat station for direct HE and DHW
Troubleshooting
HE
If operating disturbances occur, the following basic
features should be checked before carrying out
actual trouble shooting:
- the substation is connected to electricity
(applies only to flat stations with room
thermostat),
- the strainer on the district heating supply pipe
is clean,
- the flow temperature of the district heating
is at the normal level (summer, at least 60 °C
- winter, at least 70 °C),
- the differential pressure is higher than or equal
to the normal (local) differential pressure in the
district heating network – if in doubt, ask the
district heating plant,
- there is pressure on the system.
Problem Possible cause Solution
No heat
Strainer clogged on DH or HE side
(radiator circuit).
Filter in the district heating meter
clogged.
Defective or wrongly adjusted
differential pressure control.
Defective room thermostat/actuator
- or possibly dirt in the zone valve
housing.
Air pockets in the system.
Clean gate/strainer.
Clean the filter (after
consulting the district
heating plant).
Check the functioning of the
differential pressure control
– clean the valve seat if
required.
Check the functioning of the
room thermostat/actuator
- clean the zone valve seat if
required
Air the installation
thoroughly.
Uneven heat
distribution
Air pockets in the system.
Air the installation
thoroughly
Supply temperature
too low
Strainer clogged. Clean gate/strainer.
Poor cooling
Too small heating surface/too small
radiators in relation to the total
heating requirement of the building.
Poor utilization of existing heating
surface.
The system is single-pipe.
Increase total heating
surface.
Make sure the heat is
distributed evenly across
the full heating surface. It
is recommended to avoid
fully opened thermostats
on some radiators and fully
shut-off thermostats on
others. Higher temperature
at the top and lower
temperature at the bottom
part of radiators means that
the system operation is
correct.
It is extremely important to
keep the flow temperature to
the radiators as low as ever
possible, while maintaining a
reasonable level of comfort.
Danfoss Redan A/S
Sindalsvej 33-35
DK-8240 Risskov, Denmark
Phone: +45 87 43 89 43
Fax: +45 87 43 89 44
redan@danfoss.com
www.redan.danfoss.dk
Akva Lux TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.N1.02 © Danfoss 09/200610
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Danfoss Akva Lux TDP Operating instructions
- Type
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