Danfoss DHP-AL User manual

USER’S MANUAL
DHP-AL
Navigate through the control computer’s menu by:
To increase or reduce the set values use:
To adjust the room temperature: starting 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 tempera-
ture appears in the display again, together with other infor-
mation.) The heat pump now starts to work to reach the new
temperature.
Want to know more? Read this User’s Manual!
VUBMF102

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VUBMF102
Table of contents
1 Important information........................................................4
1.1 Safety precautions .......................................................................4
1.2 Protection ...............................................................................4
2 About your heat pump........................................................5
2.1 Principles of function ....................................................................5
2.2 Components.............................................................................6
2.3 Auxiliary heat ............................................................................7
2.4 Water heater.............................................................................8
2.5 Regulation information ..................................................................9
2.6 Installation principle ....................................................................14
3 Control computer ...........................................................15
3.1 Display .................................................................................16
3.2 Menus..................................................................................18
4 Trimming the heating system ................................................24
5 Instructions ................................................................25
5.1 Setting operating mode.................................................................25
5.2 Setting ROOM values ...................................................................25
5.3 Adjusting CURVE values.................................................................25
5.4 Adjusting a specific part of the heat curve ...............................................26
5.5 Setting MAX and MIN values ............................................................26
5.6 Setting HEATSTOP ......................................................................26
5.7 Reading off temperatures ...............................................................27
5.8 Calculating energy consumption ........................................................27
5.9 Manual defrost .........................................................................28
6 Regular checks ..............................................................29
6.1 Checking operation .....................................................................29
6.2 Checking the brine level ................................................................29
6.3 Checking the water level in the heating system..........................................30
6.4 Checking the safety valve ...............................................................30
6.5 In the event of leakage..................................................................31
6.6 Cleaning the strainer for the heating system.............................................31
6.7 Cleaning the strainer for the brine circuit ................................................32
7 Accessories .................................................................33
7.1 Room temperature sensor...............................................................33
8 Troubleshooting ............................................................34
8.1 Alarm...................................................................................34
9 Terms and abbreviations.....................................................35
10 Default settings in the control computer ......................................37
11 References ..................................................................38
11.1 Installation performed by: ..............................................................39

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1 Important information
• If 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 installation. (Contact an authorized
installer, see the “References” section)
• The installation can be considered maintenance free but certain checks are necessary (see
“Regular checks”).
• Before changing the control computer’s settings, first find out what these changes mean.
• Contact your installer for any service work.
1.1 Safety precautions
Installation and maintenance
• Only authorized installers may install, operate and carry out maintenance and repair work
on the heat pump. (See the“References” section)
• Only authorized electricians may modify the electrical installation. (See the “References”
section)
󰥎 DANGER TO LIFE! Only authorized refrigeration technicians may work on the refriger-
ant circuit. (See the “References” section).
System modifications
Only authorized installers may carry out modifications on the following components:
• The heat pump unit
• The pipes for the refrigerant, brine, water and power
• The safety valve
You must not carry out construction installations that may affect the operational safety of the
heat pump.
Safety valve
The following safety precautions apply to the hot water circuit’s safety valve with correspond-
ing overflow pipe:
• Never block the connection to the safety valve’s overflow pipe.
• Water 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.
1.2 Protection
Corrosion Protection
Due to the risk of corrosion, avoid using different types of sprays in the vicinity of the heat
pump. This particularly applies to:
• Solvents
• Chlorinated cleaning agents
• Paints
• Adhesives

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2 About your heat pump
2.1 Principles of function
A heat pump utilises the free energy found in a natural heat source, such as rock, ground,
or air. The heat pump can be compared to a reversed refrigerator. In a refrigerator, heat is
transferred from the inside of the refrigerator to the outside. In a heat pump the heat that
is stored in a heat source is transferred to the inside of the house. The heat pump uses the
energy in the heat source and gives back two to three times more heat energy than what it
uses in electrical energy. The heat pump is, therefore, a very environmentally friendly and
economical way of heating a house.
In order for the heat pump to be able to retrieve heating energy from the heat source and
transfer it to the heating system of the house, three separate fluid circuits are required.
The circuit that retrieves the heating energy from the heat source is called the brine circuit
and it maintains a low outgoing temperature to be heated by the heat source.
The next circuit is called the refrigerant circuit and is a closed circuit which takes the retrieves
heating energy and transfers it to the last circuit, the heat transfer fluid circuit.
The heat transfer fluid circuit holds the fluid that circulates in the heating system of the
house and in the heat pump’s water heater.
The figure below shows how the different circuits work together in the transfer of heating energy.
Figure 1: Function principles of a heat pump.
1 A fluid (brine) filled hose is lowered into a lake, buried in the ground or lowered into bed-
rock. The brine obtains energy from the heat source by the fluid temperature in the hose
being heated a few degrees by the surrounding heat source. The fluid filled hose is also
known as a collector.
Expansion valve/
pressure drop
Enclosed
refrigerant
Compressor/
pressure increasing
Brine
Condenser
Evaporator
Heat transfer fluid circuit – is the circuit that contains the water that
transports the heat/energy to the heating system and the water heater.
Refrigerant circuit – is the circuit that contains a chlorine and freon free
refrigerant which, inside the heat pump, transfers the energy retrieved
from the brine circuit through evaporation, compression and condensa-
tion, and supplies it to the heat transfer fluid circuit.
Brine circuit – is the circuit that contains an antifreeze water based mix
that obtains and transports energy from the heat source to the heat pump.
This circuit is also known as the collector.
Heat source
Heating system and
water heater

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2 The brine is guided into the heat pump’s evaporator. The enclosed refrigerant in the
refrigerant circuit is forced to boil as the pressure in the expansion valve drops and
later evaporates to a gas in the evaporator. The energy produced during this process is
released by the heated brine.
3 The refrigerant that now contains a large quantity of energy in the form of heat is trans-
ferred to the compressor, which both increases its temperature and pressure.
4 The refrigerant then continues to the condenser. When condensing, the refrigerant
supplies its heat energy to the heat transfer fluid circuit. The refrigerant’s temperature
decreases and returns to a liquid state.
5 The heat transfer fluid circuit transports the heat energy out to the water heater, radiator
or the under floor heating system, which heat up.
6 The refrigerant is then transported through the expansion valve where the pressure
drops and the refrigerant starts to boil and then the process starts again.
2.2 Components
DHP-AL is a heat pump installation for both heating and producing domestic hot water for
the home. The heat pump uses outdoor air as a heat source and retrieves energy from the air
using an air heat exchanger in a separate outdoor unit.
The compressor in the heat pump is first compressor on the market that is specially devel-
oped for heat pumps. It also has an integrated electrical heating element which provides
auxiliary heat that can be used when the heating requirement exceeds the capacity of the
heat pump. The heat pump supplies as much of the heat demand as possible before auxiliary
heating is engaged and assists.
The heat pump is equipped with control equipment, which is controlled via a control panel.
The control equipment controls the heat pump unit’s included components (compressor,
circulation pumps, auxiliary heater and outdoor unit) and determines when to start and stop
the pump as well as producing heat and cooling for the house.
Heat enters the house via a water borne heating system, a low temperature system. One is
used to cool the house. The heat pump’s function for cooling connects automatically when
the outdoor temperature exceeds the set parameter.
The heat pump unit consists of five basic units:
1 Heat pump unit
• Scroll compressor
• Stainless steel heat exchanger (evaporator and condenser)
• Circulation pumps for brine and heating systems
• Valves and safety equipment and corresponding electrical components.
2 Auxiliary heat
• 15 kW electric heating element (4.5 kW at 230 V heat pump installation)
• Electric heating element control in a maximum of five steps (three steps for 230 V heat
pump installation)
• Installed on the heating system’s supply pipe
• Covers the demand of extra energy if the heat pump’s capacity is exceeded
• Automatically connected in the heat pump unit if operating mode AUTO is selected.
3 Control equipment (not shown in the figure)
• Control computer with graphic display
• Temperature sensors (outdoor, supply pipe, return pipe, brine and hot water)
• Room sensor (option)

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4 Water heater
• Water heater with defrosting tank
5 Outdoor unit
• Air heat exchanger
• Fan
Figure 2: Complete DHP-AL heat pump installation.
2.3 Auxiliary heat
The auxiliary heater is made up of an electric heating element on the supply pipe that has
three outputs, ADD.HEAT 1, ADD.HEAT 2 and ADD.HEAT 3, and can be controlled in five steps:
• Step 1 = ADD.HEAT 1 = 3 kW
• Step 2 = ADD.HEAT 2 = 6 kW
• Step 3 = ADD.HEAT 1 + ADD.HEAT 2 = 9 kW
• Step 4 = ADD.HEAT 2 + ADD.HEAT 3 = 12 kW
• Step 5 = ADD.HEAT 1 + ADD.HEAT 2 + ADD.HEAT 3 = 15 kW
To calculate the total energy consumption, see the “Settings- Calculating energy consump-
tion” section.
In the event of an alarm, the auxiliary heater engages automatically.
1
5
2
4
3

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2.4 Water heater
Danfoss DHP-AL is supplied with an integrated 180 litre water heater with a tank outside the
water heater that contains the anti-freeze.
Figure 3: Water heater in DHP-AL.
Using a regular time interval, the water in the water heater is heated to 60°C to prevent the
build up of bacteria (legionella function). The factory set time interval is seven days.
Hot water production is prioritised ahead of heat production, i.e. no heat is produced if there
is a hot water demand at the same time.
The temperature of the hot water cannot be adjusted. Hot water production does not cease
at a determined temperature but when the compressor’s operating pressure switch reaches
its maximum operating pressure, which corresponds to a hot water temperature of approxi-
mately 50-55°C.
In the control computer’s TEMPERATURE menu, a number of measured and calculated tem-
peratures for the hot water and supply are displayed. There you can see the current hot water
temperature and the temperature of the supply pipe during heating and hot water produc-
tion. The temperature of the supply pipe often exceeds the maximum permitted hot water
temperature, but usually during hot water production.
Position Name
1 Hot water line
2 Cold water
3 Defrosting tank
4 Water heater
5 TWS coil
1 2
3
4
5

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2.5 Regulation information
Heat production - calculating
The indoor temperature is adjusted by changing the heat pump’s heat curve, which is the
control computer’s tool for calculating what the supply temperature should be for water that
is sent out in the heating system. The supply temperature is calculated from the outdoor tem-
perature and two adjustable values: CURVE and ROOM. The lower the outdoor temperature,
the higher the supply temperature. In other words, the supply temperature 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 conditions. A correctly set
heat curve reduces maintenance and saves energy.
CURVE
The control computer shows the value for CURVE by means of a graph in the display. You can
set the heat curve by adjusting the CURVE value. The CURVE value indicated which supply
temperature the heating system is to have at an outdoor temperature of 0°C.
Figure 4: Graph showing the set value 40 for CURVE.
At outdoor temperatures colder than 0°C, supply water hotter than 40°C is sent out to the
heating system and at outdoor temperatures greater than 0°C, supply water cooler than 40°C
is sent out.
Value for CURVE is 40...
Outdoor temperature
Supply temperature
...at zero degrees
Maximum supply
temperature

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Figure 5: Increasing or reducing the CURVE changes the slope of the curve
If you increase the CURVE value, the heat curve will become steeper and when you reduce it,
it will become flatter.
The most energy efficient and cost effective setting is achieved by changing the CURVE value
to adjust the temperature in the house to an even and constant temperature. For a tempo-
rary increase or reduction, adjust the ROOM value instead.
ROOM
If you wish to increase or reduce the indoor temperature, change the ROOM value. The differ-
ence between changing the ROOM value and the CURVE value is that the system’s heat curve
does not become steeper or flatter if the ROOM value is changed, which the curve becomes
if the CURVE value changes, instead the entire heat curve is moved by 3°C for every degree
change of the ROOM value. The reason that the curve is adjusted 3° is that an approximate 3°
increase in supply temperature is needed to increase the indoor temperature 1°.
Figure 6: Changing the ROOM value changes the heat curve upwards or downwards.
Supply temperature
Outdoor temperature
Maximum supply tem-
perature
Supply temperature
Outdoor temperature
Maximum supply
temperature