Danfoss Akva Multi TDP Operating instructions
- Type
- Operating instructions
Instructions
Akva Multi TDP
District heating flat station for direct heating
and domestic hot water systems
DH-SMT/PL
VI.KR.Q1.02 © Danfoss 09/2006 1
Akva Multi TDP
Table of contents Akva Multi 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 ................................................... 7
Troubleshooting HE ....................................... 8
Akva Multi TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.Q1.02 © Danfoss 09/20062
Safety notes
Following instructions refer to the standard
design of the Akva Multi 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 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 Multi TDP flat station is delivered without
cover as a standard.
Optional flat station equipment:
- safety valve and non-return valve (DCW),
- fitting piece and connection pipe for DCW
meter,
- 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 Akva Multi TDP is delivered without DHW
circulation pipe connection.
Equipment for DHW circulation is optional
equipment and must be ordered separately.
(Remember circulation pump and non-return valve
assembly; 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.Q1.02 © Danfoss 09/2006 3
Akva Multi TDP - district heating flat station for direct HE and DHW
Mounting
The picture shows Akva Multi TDP flat station with
pipe connection for DHW circulation.
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 Multi 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.
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
Akva Multi TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.Q1.02 © 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 370 x D 210***
With cover: H 490-590 x W 410 x D 320
*** allow for depth of heat meter
* 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 Multi 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
continuous use.
All Danfoss heat exchangers and flat stations have
been pressure tested prior to delivery.
Instructions
DH-SMT/PL
VI.KR.Q1.02 © Danfoss 09/2006 5
Akva Multi TDP - district heating flat station for direct HE and DHW
Control 1. Multifunctional self-acting controller
The controller consist of:
- Differential pressure controller,
- Hydraulic proportional controller for
controlling of DHW,
- Thermostatic valve for controlling of DHW,
- DHW priority function
The differential pressure controller controls the
differential pressure across the room heating
system. 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 basic function
of the controller for DHW system is a hydraulic
proportional controller, which controls the primary
flow proportional to the DHW flow rate. The control
valve also contains a thermostatic valve parallel
connected for adapting the DHW temperature
according to set value. The setting range of the
valve is 45 - 55 °C. The thermostatic valve maintains
a stand by temperature in the heat exchanger.
In case of DHW tapping, the priority function in
the controller reduces the flow rate in the room
heating system.
To ensure proper function of the multifunctional
controller the supply temperature has to be
about 10 °C higher than the set temperature of
the DHW.
The multifunctional controller is preset from
factory and should not be adjusted afterwards.
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.
2. HE temperature control
The HE temperature in the house is controlled
by radiator thermostats. As an option the Akva
Multi 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 Multi TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.Q1.02 © Danfoss 09/20066
3. DHW temperature control
The DHW temperature is controlled by a
multifunctional self-acting controller. The DHW
temperature can be set to 45-55 °C at normal use.
The temperature should never exceed 55 °C to avoid
lime scale precipitation in the heat exchanger.
Setting changes:
- turn screw by using the Allen wrench (3 mm):,
- 360 ° rotation clockwise: -1 °C,
- 360 ° rotation counter-clockwise: +1 °C
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.Q1.02 © Danfoss 09/2006 7
Akva Multi 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 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.
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 Multi TDP - district heating flat station for direct HE and DHWInstructions
DH-SMT/PL
VI.KR.Q1.02 © Danfoss 09/20068
Troubleshooting
HE
If operating disturbances occur, the following basic
features should be checked before carrying out
actual troubleshooting:
- the substation is connected to electricity
(applies only to stations 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 65 °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 functioning of the
differential pressure
controller – 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 distri-
buted 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.
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Danfoss Akva Multi TDP Operating instructions
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- Operating instructions
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