Danfoss Akva Multi TDP-F Operating instructions

Brand: Danfoss

Model: Akva Multi TDP-F

Type: Operating instructions

Instructions

Akva Multi TDP-F

District heating ﬂat station for direct heating

and domestic hot water systems

DH-SMT/PL

VI.KR.R1.02 © Danfoss 09/2006 1

Akva Multi TDP-F

Table of contents Akva Multi TDP-F ........................................... 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 ................................................... 6

Troubleshooting HE .......................................7

Akva Multi TDP-F - district heating ﬂat station for direct HE and DHWInstructions

DH-SMT/PL

VI.KR.R1.02 © Danfoss 09/20062

Safety notes

Following instructions refer to the standard

design of the Akva Multi TDP-F 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.

We recommend installation of 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.

Noise 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 exceed 300 mg/l.

The risk of equipment corrosion increases

considerably if the recommended permissible

chloride compounds are exceeded.

Delivery

The Akva Multi TDP-F ﬂat station is delivered

without cover as a standard.

Optional ﬂat station equipment:

- connection pipe for circulation,

- circulation pump,

- safety valve / non-return valve,

- return temperature limiter,

- ball valves w. and w/o pocket for pressure/

thermometer gauge 3/4” ext. thread

- ball valves w and w/o pocket for pressure/

thermometer gauge 3/4 int. thread

- thermometer Ø35

- zone valve with actuator

- connection rail with 7 connections 3/4” (int.

thread), insulated or non-insulated,

- room thermostat with day and /or week

program,

- heat meter (DH supply),

- cold water meter

- white-lacquered steel sheet cover

Standard delivery:

The Akva Multi TDP-F is delivered without DHW

circulation connection pipe.

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.R1.02 © Danfoss 09/2006 3

Akva Multi TDP-F - district heating ﬂat station for direct HE and DHW

Mounting

The picture shows Akva Multi TDP-F ﬂat station

with the optional features: Connection pipe for

DHW circulation and zone valve.

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-F 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

The ﬂat station is equipped with a ﬁtting piece for

insertion of DCW meter.

Assembly of DCW meter

Please refer to above assembly instructions for heat

meter.

Zone valve with actuator

The ﬂat station is equipped with a ﬁtting piece for

insertion of zone-valve with actuator.

Assembly of zone valve with actuator

Please refer to above assembly instructions for heat

meter.

Return temperature limiter

The ﬂat station is equipped with a ﬁtting piece for

insertion of return temperature limiter.

Assembly of return temperature limiter

Please refer to above assembly instructions for heat

meter.

Akva Multi TDP-F - district heating ﬂat station for direct HE and DHWInstructions

DH-SMT/PL

VI.KR.R1.02 © Danfoss 09/20064

Pipes connections

Internal installation and district heating* pipes

connections must be made by means of threaded

or welded connections.

Connections:

1 District heating (DH) supply

2 District heating (DH) return

3 Domestic cold water (DCW) inlet

4 Domestic cold water (DCW) outlet

5 Domestic hot water (DHW)

6 Heating (HE) supply

7 Heating (HE) return

8 DHW circulation – optional

Connection size:

DH + DCW + DHW: G ¾” (int. thread)

HE + optional DHW circ.: G ¾” (int. thread)

Dimensions (mm):

Without cover:

H 640 x W 565 x D 110 (incl. ball valves)

H 520 x W 565 x D 110 (excl. ball valves)

With cover:

H 740 x W 600 x D 150

* 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-F 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 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.R1.02 © Danfoss 09/2006 5

Akva Multi TDP-F - district heating ﬂat station for direct HE and DHW

Control 1. Multifunctional self-acting controller

The controller consists 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 is a hydraulic proportional controller, which

controls the DH 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-F 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-F - district heating ﬂat station for direct HE and DHWInstructions

DH-SMT/PL

VI.KR.R1.02 © 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. 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.

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

Akva Multi TDP-F - district heating ﬂat station for direct HE and DHW

Troubleshooting

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

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 Multi TDP-F - district heating ﬂat station for direct HE and DHWInstructions

DH-SMT/PL

Danfoss Akva Multi TDP-F Operating instructions

Danfoss Akva Multi TDP-F Operating instructions

Danfoss Akva Multi TDP-F Operating instructions

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