Danfoss DHP-AX Manuale utente

USER MANUAL

DHP-AX

Navigate through the control computer’s menu using:

To increase or reduce the set values use: or

To adjust the room temperature: start by pressing

The degree information that now appears in the display is the last

desired room temperature.

To increase the temperature: press

To lower the temperature: press

The temperature you now require is registered immediately.

(After approximately ten seconds the desired room temperature

appears in the display again, together with other information.)

The heat pump now starts to work to reach the new temperature.

Want to know more? Read the User manual!

VUBMI102

DHP-AX – 2 VUBMI102

DHP-AX – 3

VUBMI102

Innehållsförteckning

Important information1 ...................................... 5

Safety precautions1.1 ...........................................5

Protection1.2 ...................................................6

About your heat pump2 ..................................... 7

Principles of function2.1 ........................................7

Components2.2 ................................................8

Heating and defrost functions2.3 ................................9

Auxiliary heat2.4 ...............................................10

Regulation information3 ....................................10

Control panel4 ..............................................18

Display4.1 .....................................................20

Menu information5 .........................................22

INFORMATION menu5.1 ........................................22

Trimming the heating system6 ..............................30

Instructions7 ...............................................31

Setting operating mode7.1 ....................................31

Setting ROOM values7.2 .......................................31

Adjusting CURVE values7.3 .....................................32

Adjusting a specific part of the heat curve7.4 ...................32

Setting MIN and MAX values7.5 ................................32

Setting HEAT STOP7.6 ..........................................33

Reading off temperatures7.7 ...................................33

Manual defrost7.8 .............................................34

Regular checks8 ............................................35

Checking operation8.1 .........................................35

Checking the water level in the heating system8.2 ..............35

Checking the safety valve8.3 ...................................36

In the event of leakage8.4 ......................................36

Cleaning the strainer for the heating system8.5 .................36

Accessories9 ................................................38

Room temperature sensor9.1 ..................................38

Troubleshooting10 ...........................................39

Alarm10.1 ......................................................39

Terms and abbreviations11 ...................................41

Default settings in the control computer12 ...................42

References13 ................................................43

Check list13.1 ...................................................43

Installation carried out13.2 ......................................44

DHP-AX – 4 VUBMI102

These instructions are valid for the following model of Danfoss heat pump:

DHP-AX

If these instructions are not followed during installation, operation and mainte-

nance, Danfoss AS’s liability according to the applicable warranty is not binding.

Danfoss AS retains the right to make changes to components and specifications

without prior notice.

DHP-AX – 5

VUBMI102

Important information1

DIf the installation is not used during the winter, the heating system must

be drained of water, otherwise there is a risk of frost damage to the instal-

lation. (Contact an authorized installer, see the ”13 References” section)

zThe installation can be considered maintenance free but certain checks are nec-

essary (see “8 Regular checks”).

zBefore changing the control computer’s settings, first find out what these chang-

es mean.

zContact your installer for any service work.

DThis apparatus is not intended for persons (including children) with

reduced physical, sensory or psychological capacity, or who do not have

knowledge or experience, unless supervised or they have received instruc-

tions on how the apparatus functions from a safety qualified person.

DChildren are not permitted to play with the apparatus.

Safety precautions1.1

Installation and maintenance1.1.1

AOnly authorized installers may install, operate and carry out maintenance

and repair work on the heat pump. (See the ”13 References” section)

BOnly authorized electricians may modify the electrical installation. (See the

”13 References” section)

AFATAL DANGER! Only authorized refrigeration technicians may work on

the refrigerant circuit. (See the ”13 References” section.)

System modifications1.1.2

Only authorized installers may carry out modifications on the following compo-

nents:

zThe heat pump unit

DHP-AX – 6 VUBMI102

zThe lines for refrigerant, water and power

zThe safety valve

You must not carry out construction installations that may affect the operational

safety of the heat pump.

Safety valve1.1.3

The following safety precautions apply to the hot water circuit’s safety valve with

corresponding overflow pipe:

DNever block the connection to the safety valve’s overflow pipe.

DWater expands when it is heated, this means that a small amount of water

is released from the system via the overflow pipe. The water that exits the

overflow pipe can be hot! Therefore, allow it to flow to a floor drain where

there is no risk of burning yourself.

Protection1.2

Corrosion Protection1.2.1

Due to the risk of corrosion, avoid using different types of sprays in the vicinity of

the heat pump. This particularly applies to:

zSolvents

zChlorinated cleaning agents

zPaints

zAdhesives

DHP-AX – 7

VUBMI102

About your heat pump2

Principles of function2.1

A heat pump utilises the free energy from the sun and that is found in a natural

heat source, such as rock, ground, ground water or air. The heat pump can be com-

pared to a reversed refrigerator; in a refrigerator heat

is transferred from the inside of the refrigerator to the

outside, whereas in a heat pump, the stored solar energy

that is stored in a heat source is transferred to the inside

of the house. The heat pump uses the solar energy in the

heat source and gives back two to three times more heat

energy than it uses in electrical energy. The heat pump is,

therefore, a very environmentally friendly and economical

way of heating a house.

Figure 1: The relationship between consumed electrical energy and free solar energy.

In order for the heat pump to be able to retrieve heating energy from the outdoor

air and transfer it to the heating system of the house, two separate liquid circuits

are required. The figure below shows the different circuits and how they work

together in the transfer of heating energy.

Figure 2: Function principles of a heat pump.

Expansion valve/

pressure drop

Enclosed

refrigerant

Compressor/

pressure increasing

Water

Fan

Condenser

Air heat exchanger

Heating system – is the circuit that con-

tains the water that transports the heat/

energy to the heating system and the

water heater.

Refrigerant circuit – is the closed circuit

that contains a chlorine and freon free

refrigerant that inside the heat pump,

transfers the retrieved heat energy to the

heating system through evaporation,

compression and condensation.

Outdoor air

Heating system

DHP-AX – 8 VUBMI102

zA fan draws up the outdoor air through an air heat exchanger, which heats up

the cold refrigerant, which evaporates into a gas. The energy produced during

this process is retrieved from the passing outdoor air.

zThe refrigerant that now supplies energy in the form of heat is transferred to the

compressor, which both increases its temperature and pressure.

zThe extremely hot refrigerant continues to the condenser. Here, the refrigerant

is cooled and releases its heating energy to the heating system. The refrigerant’s

temperature drops and condenses to a liquid state.

zThe heating system transports the heating energy out to the water heater or the

heating system, which indirectly heats the house.

zThe refrigerant is then transported through the expansion valve where the pres-

sure and temperature drop and the process starts again.

Components2.2

DHP-AX is a complete heat pump installation for heating. It can be supplemented

with a water heater and auxiliary heater.

DHP-AX is equipped with a control system, which is controlled via a control panel.

Heat enters the house via a water borne heating system.

The heat pump unit consists of the following basic units:

1 Heat pump unit

zCompressor

zCondenser

zFour way valve

2 Fan

zOne speed

3 Air heat exchanger

In addition to these units, there is control

equipment (installed indoors), which controls

the heat pump unit’s component parts (com-

pressor, circulation pumps, auxiliary heaters

and exchange valve) and determines when to

start and stop the pump as well as whether to

produce heat for the house or hot water.

Figure 3: DHP-AX’s main components.

DHP-AX – 9

VUBMI102

Heating and defrost functions2.3

Heating2.3.1

DHP-AX is a heat pump that produces heating for houses and water heaters

depending on the existing demand. Hot water production is continuous but during

the summer heat production to the house is stopped when the outdoor tempera-

ture reaches the value for HEAT STOP.

During the winter, hot water and heat is produced for the house by the compres-

sor until the outdoor temperature reaches the value for OUTDOOR STOP when it

becomes too cold for the compressor to operate. If an auxiliary heater has been

installed, it is used to produce hot water and heating for as long as OUTDOOR STOP

applies.

DHP-AX defrosts the air heat exchanger automatically if required.

Defrost function2.3.2

During operation the air heat exchanger is cooled by the energy exchange at the

same time as the humidity causes it to become covered in frost. DHP-AX has an

automatic function to defrost the air heat exchanger using the produced heat ener-

gy. If necessary, a defrosting sequence starts which means the following:

zThe defrost sequence starts when the temperature of the incoming refrigerant is

lower than the set value, which is based on a curve that is related to the outdoor

temperature

zThere are restrictions for the defrost regarding time in operation and FAN on

zThe four way valve in the heat pump switches the direction of flow of the refrig-

erant and the fan stops, see figure below

zThe hot refrigerant melts the frost on the air heat exchanger

zDefrost stops on time, operating pressostat or incoming temperature.

zThe four way valve switches the direction of flow of the refrigerant back so that

heat production resumes and operation returns to normal

The process is reversed by means of the four way valve that changes the direction

of flow, which means that the air heat exchanger for heating becomes a condenser

and the heating’s condenser becomes an evaporator. This function is used for

defrosting.

As the heat pump’s defrosting sequence retrieves its energy from the house’s

heated heating system during the winter months, the water tank is primarily used

as a heating buffer. If a water heater is not installed, the water volume in the heating

system must be increased by installing a surge tank (accessory).

DHP-AX – 10 VUBMI102

Auxiliary heat2.4

Auxiliary heater is an option for DHP-AX and consists of an immersion heater, which

is located on the supply pipe ahead of the exchange valve.

The auxiliary heater, which is supplied as an accessory has an integrated power con-

trol and is controlled by a potential free output from the heat pump. In the event of

power cuts longer than three minutes, only a 6 kW output may be connected imme-

diately after power has returned, the remaining output is delayed two hours.

If the auxiliary heater is installed it engages AUTO mode automatically when the

heat demand is greater than the heat pump’s capacity.

In the event of alarms that mean that the compressor does not start, hot water will

not be produced in order to indicate to the customer that something is wrong. Heat

is produced by the auxiliary heater so that the house does not become cold.

Regulation information3

Heat production - calculating3.4.1

The indoor temperature is adjusted by changing the heat pump’s heat curve, which

is the control system’s tool for calculating what the supply temperature should be

for water that is sent out in the heating system. The heat curve calculates the sup-

ply temperature depending on the outdoor temperature. The lower the outdoor

temperature, the higher the supply temperature. In other words, the supply tem-

perature of the water fed to the heating system will increase exponentially as the

outside air temperature falls.

The heat curve will be adjusted in connection with installation. It must be adapted

later on, however, to obtain a pleasant indoor temperature in any weather condi-

tions. A correctly set heat curve reduces maintenance and saves energy.

CURVE3.4.2

The control computer shows the value for CURVE by means of a graph in the char-

acter window. You can set the heat curve by adjusting the CURVE value. The CURVE

value indicates the supply temperature of the water to be sent out to the heating

system at an outdoor temperature of 0°C.

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