Danfoss Akva Vita TDP Operating instructions
- Type
- Operating instructions
Instructions
Akva Vita TDP
District heating flat station for direct heating
and domestic hot water systems
DH-SMT/PL
VI.KR.W1.02 © Danfoss 09/2006 1
Akva Vita TDP
Table of contents Akva Vita 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 ............................................................ 5
Maintenance ................................................... 8
Troubleshooting DHW ................................... 9
Troubleshooting HE ....................................... 10
Akva Vita TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.W1.02 © Danfoss 09/20062
Safety notes
Following instructions refer to the standard
design of the Akva Vita 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 Vita 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,
- thermostatic by-pass with return temperature
limiter 10/50 °C for by-pass function (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 equipment 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.W1.02 © Danfoss 09/2006 3
Akva Vita 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 Vita 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 Vita 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 PM 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 PM 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 circulation installation system with
connection pipe for circulation.
- Remember pump assembly and non-return
valve mounting in the circulation installation
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 Vita TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.W1.02 © 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 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 Circulation: 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 Vita 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 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
operates unproblematically, it can be taken into
continuous use.
All Danfoss heat exchangers and flat stations have
been pressure tested prior to delivery.
Instructions
DH-SMT/PL
VI.KR.W1.02 © Danfoss 09/2006 5
Akva Vita 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
Vita 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 thermostats
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.
Akva Vita TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.W1.02 © Danfoss 09/20066
3. DHW temperature control
The DHW temperature is controlled by a
proportional valve – the PM controller. The DHW
temperature control is realized by turning the
lever towards the red (hot) or blue (cold) mark. The
temperature should be set to 45-48 °C at normal
use (7-8 l/min). The temperature should never
exceed 55 °C to avoid lime scale precipitation in
the heat exchanger.
If it is not possible to set the temperature according
to the above recommendations, it is recommended
to change the standard controller setting.
PM controller
The PM controller can operate in three basic
settings:
- High
- Standard – default
- Low
Approximate setting of PM controller is dependent on
district heating supply temperature and ∆p:
Supply
temperature:
Disposable differential
pressure ∆p (bar):
0.2 - 0.5 0.5 -1.0 > 1.0
60 - 70 °C low low standard
70 - 80 °C low standard standard
80 - 90 °C low high high
Setting changes:
- dismount lever by using the attached Allen
wrench,
- remove plastic cap,
- mount lever again and turn it:
- 1 rotation clockwise – high,
- 1 rotation counter – clockwise – low,
- mount cap and lever again.
Instructions
DH-SMT/PL
VI.KR.W1.02 © Danfoss 09/2006 7
Akva Vita TDP - district heating flat station for direct HE and DHW
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 Vita TDP
flat station is connected to the circulation system
in the building, the thermostat will control the
circulation water 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 Vita TDP flat station has
been delivered with by-pass control and this must
be changed to DHW circulation, 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.
Akva Vita TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.W1.02 © Danfoss 09/20068
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 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.
Instructions
DH-SMT/PL
VI.KR.W1.02 © Danfoss 09/2006 9
Akva Vita TDP - district heating flat station for direct HE and DHW
Troubleshooting
DHW
Problem Possible cause Solution
In general: Does the PM
controller work incorrectly?
If the quantity of tapping water
is normal (temperature
unimportant) it indicates that the
PM controller works correctly.
Locate defect in another part
of the installation
(see below)
In general: Are the operating
conditions satisfactory?
The flat station requires a DH
supply temperature of minimum
60 °C and a differential pressure
during operation according to the
information stated in the product
sheet for Akva Vita TDP.
Contact district heating
supplier.
PM controller leaking;
Water leaking from Allen
screws
at the central part of
PM controller.
One of the two O-rings is defective
(does not influence the PM
operation). 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 heat exchanger.
Replace PM controller
(use new sealing).
DHW tap load too low
The diaphragm of the PM controller
is defective.
Replace diaphragm
or PM controller.
DHW tap load too low;
Tap temperature too low;
Tap temperature fluctuates;
PM controller wrongly
adjusted,
Strainer on DH supply clogged,
Defective non-return valve in
thermostatic battery (DHW tap
temperature lower than DHW from
flat station),
Defective non-return valve in hot-
water circulation (circulation return
pipe is getting cold during tapping
of hot water),
Lime scale precipitation in
plate heat exchanger for DHW
(primary Δt too low during DHW
tapping),
Dirt in PM controller,
DCW flow too high (big nominal
diameter of pipe, high DCW
pressure), in total max. 16-17 litres
per minute.
Setting, see Regulation
chapter.
Clean strainer.
Clean or replace non-return
valve.
Clean or replace non-return
valve.
Replace the plate heat
exchanger.
Cleaning, see PM controller
instruction.
DCW reduction.
DH return water temperature
too high while on standby;
The plate heat exchanger is
cold…
The by-pass thermostat is defective
or wrongly adjusted.
Replace or adjust by-pass
thermostat correctly
DH return water temperature
too high while on standby;
The plate heat exchanger is
hot…
Dirt (sand, iron splinters or similar)
in PM controller. Controller does not
close. Noise from flow can often be
heard.
Move handle several times
between red and blue
markings; at the same
time do several hot-
water tappings. Clean PM
controller.
DH return temperature
too high during hot water
tapping.
Lime scale precipitation in the plate
heat exchanger for DHW
Replace plate heat exchanger
Connecting pieces of the PM
controller do not fit the flat
station
In particular when replacing PM
controller in old flat station
Loosen Allen screws; turn
half of the PM controller 180°
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 Vita TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.W1.02 © Danfoss 09/200610
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 substations with room
thermostat),
- the strainer on the district heating supply pipe
is clean,
- the supply 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).
Strainer in the district heating meter
clogged.
Defective or wrongly adjusted
differential pressure controller.
Defective room thermostat/actuator
- or possibly dirt in the zone valve
housing.
Air pockets in the system.
Clean gate/strainer.
Clean the strainer (after
consulting the district
heating plant).
Check the operation of the
differential pressure
controller – clean the valve
seat if required.
Check the operation 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 supply temperature
to the radiators as low as ever
possible, while maintaining a
reasonable level of comfort.
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Danfoss Akva Vita TDP Operating instructions
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- Operating instructions
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