Danfoss DHP-AT Installation guide

Danfoss
Brand
Danfoss
Model
DHP-AT
Category
Heat pumps
Type
Installation guide

Danfoss DHP-AT is an air to water heat pump that can be used for heating and cooling your home. It is a highly efficient and environmentally friendly way to heat and cool your home, as it uses renewable energy from the air. The heat pump is also very quiet, so it will not disturb you or your family.

Here are some of the features of the Danfoss DHP-AT:

  • Heating and cooling: The heat pump can be used to heat your home in the winter and cool it in the summer.
  • High efficiency: The heat pump is very efficient, so it will save you money on your energy bills.
  • Environmentally friendly: The heat pump uses renewable energy from the air, so it is an environmentally friendly way to heat and cool your home.

Danfoss DHP-AT is an air to water heat pump that can be used for heating and cooling your home. It is a highly efficient and environmentally friendly way to heat and cool your home, as it uses renewable energy from the air. The heat pump is also very quiet, so it will not disturb you or your family.

Here are some of the features of the Danfoss DHP-AT:

  • Heating and cooling: The heat pump can be used to heat your home in the winter and cool it in the summer.
  • High efficiency: The heat pump is very efficient, so it will save you money on your energy bills.
  • Environmentally friendly: The heat pump uses renewable energy from the air, so it is an environmentally friendly way to heat and cool your home.
Installation and service
instructions
DHP-AT
VMGFI202
If these instructions are not followed during installation and
service, Danfoss A/S liability according to the applicable war-
ranty is not binding. Danfoss A/S retains the right to make
changes to components and specifications without prior notice.
© 2011 Copyright Danfoss A/S.
The English language is used for the original instructions. Other
languages are a translation of the original instructions.
(Directive 2006/42/EC)
Contents
1 About documents and decals ..................................................... 3
1.1 Introduction .................................................................................... 3
1.2 Symbols in documents ................................................................ 3
1.3 Symbols on decals ........................................................................ 3
1.4 Terminology .................................................................................... 4
2 Important information ................................................................... 5
2.1 General safety precautions ........................................................ 5
2.2 Refrigerant ....................................................................................... 5
2.3 Electrical connection .................................................................... 6
2.4 Water quality ................................................................................... 6
2.5 Commissioning .............................................................................. 7
3 Transport, delivery check and positioning ............................. 8
3.1 Transporting heat pump ............................................................ 8
3.2 Delivery check ................................................................................ 8
3.3 Positioning the heat pump ........................................................ 8
4 The heat pump ............................................................................... 10
4.1 Dimensions and connections ................................................. 10
4.2 Components ................................................................................. 11
4.3 Principle function description ................................................ 12
4.4 Check and safety functions ..................................................... 15
4.5 Heating curves ............................................................................. 15
5 System solution .............................................................................. 17
5.1 System solution ........................................................................... 17
6 Piping installation ......................................................................... 18
6.1 Pipe connection .......................................................................... 18
6.2 Connecting cold and hot water lines .................................. 18
6.3 Connecting supply and return lines ..................................... 19
6.4 Noise and vibrations .................................................................. 19
7 Electrical installation .................................................................... 21
7.1 Connecting the operator panel ............................................. 21
7.2 Connecting circulation pump ................................................ 22
7.3 Connecting hot water tank electrical heater .................... 23
7.4 Connecting external electrical heater ................................. 24
7.5 Connecting hot water sensor ................................................. 24
7.6 Connecting buffer tank sensor .............................................. 24
7.7 Connecting reversing valve hot water ................................ 25
7.8 Connecting the power supply ............................................... 26
8 Operator panel ............................................................................... 27
8.1 Important parameters ............................................................... 27
9 Commissioning .............................................................................. 28
9.1 Checking piping installation and heating system .......... 28
9.2 Checking electrical installation .............................................. 28
9.3 Filling hot water tank and heating system and
expelling excessive air ............................................................... 28
9.4 Starting the unit .......................................................................... 28
9.5 Test Operation
............................................................................. 29
9.6 After start-up and tests ............................................................. 29
9.7 Customer information ............................................................... 30
10 Troubleshooting ............................................................................ 31
10.1 Operational problems ............................................................... 31
11 Technical data ................................................................................. 33
12 Connection diagram .................................................................... 34
13 Wiring diagram .............................................................................. 35
VMGFI202 – 1
1 About documents and decals
1.1 Introduction
The following information is available for this product:
•
Installation and service instructions containing information to install and commission a heat pump installation,
information about the heat pump’s function, information about accessories, technical data, troubleshoot-
ing and maintenance instructions (this document).
•
User instructions on how to operate the unit (the user manual).
1.2 Symbols in documents
The instructions contain different warning symbols, which, together with text, indicate to the user that there are
risks involved with actions to be taken.
The symbols are displayed to the left of the text and three different symbols are used to indicate the degree of
danger:
DANGER! Indicates an immediate danger that leads to fatal or serious injury if necessary measures are not
taken.
Warning! Risk of personal injury! Indicates a possible danger that can lead to fatal or serious injury if
necessary measures are not taken.
Caution! Risk of installation damage. Indicates a possible hazard that can lead to item damage if necessary
measures are not taken.
A fourth symbol is used to give practical information or tips on how to perform a procedure.
Note! Information regarding making the handling of the installation easier or a possible operational
technical disadvantage.
1.3 Symbols on decals
The following symbols can occur on decals on the different parts of the heat pump. Which symbols are used
depends on the heat pump model.
Warning symbols
!
Warning, danger!
Warning, hazardous electrical voltage!
Installation and service instructions VMGFI202 – 3
1.4 Terminology
Term Meaning
Heating system/Heat transfer fluid
circuit
The circuit that generates heat to the property or to the domestic hot water tank heater.
Supply line The heating system’s supply line with flow direction from the heat pump to radiators/
under floor heating or domestic hot water tank heater.
Return line The heating system’s return line with flow direction from radiators/under floor heating
or domestic hot water tank heater to the heat pump.
Circulation pump Circulation pump for heating system.
Refrigerant circuit The energy carrying circuit between the outdoor air and heating system.
Refrigerant The gas/liquid that circulates in the refrigerant circuit.
Domestic hot water Domestic hot water is the water that you use around the house or office for everyday
applications, like showers, cleaning, laundry, or dishes.
Buffer tank Buffer tank is installed for equalisation of the temperature for the heating system and to
guarantee sufficient energy when defrosting.
4 – Installation and service instructions VMGFI202
2 Important information
2.1 General safety precautions
Warning! Risk of personal injury! Children are not permitted to play with the product.
Caution! The heat pump must be installed by authorised installation engineers and the installation must
follow the applicable local rules and regulations as well as these installation instructions.
Caution! This product 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 instructions on how the apparatus functions from a safety qualified person.
Caution! When cooling it is important to limit the lowest flow line temperature to prevent condensation.
2.2 Refrigerant
2.2.1 Fire risk
The refrigerant is not combustible or explosive in normal conditions.
2.2.2 Toxicity
In normal use and normal conditions the refrigerant has low toxicity. However, although the toxicity of the refrig-
erant is low, it can cause injury (or be highly dangerous) in abnormal circumstances or where deliberately abused.
Warning! Risk of personal injury! Spaces in which heavy vapour can collect below the level of the air must
be well ventilated.
Refrigerant vapour is heavier than air and, in enclosed spaces below the level of a door for example, and in the
event of leakage, concentrations can arise with a resultant risk of suffocation due to a lack of oxygen.
Warning! Risk of personal injury! Refrigerant exposed to a naked flame creates a poisonous irritating gas.
This gas can be detected by its odour even at concentrations below its permitted levels. Evacuate the area
until it has been sufficiently ventilated.
2.2.3 Work on the refrigerant circuit
Caution! Work on the refrigerant circuit must only be carried out by a certified engineer!
Caution! When repairing the refrigerant circuit, the refrigerant must not be released from the heat pump -
it must be dealt with in the appropriate way.
Installation and service instructions VMGFI202 – 5
Refilling must only be carried out using new refrigerant (for the amount and type of refrigerant see manufacturer’s
plate) through the service valves.
Caution! All warranties from Danfoss are void if, when filling with refrigerant other than Danfoss A/S
specified refrigerant, if there has not been written notification that the new refrigerant is an approved
replacement refrigerant together with other remedies.
2.2.4 Scrapping
Caution! When the heat pump is to be scrapped the refrigerant must be extracted for disposal. Local rules
and regulations related to the disposal of refrigerant must be followed.
2.3 Electrical connection
DANGER! Hazardous electrical voltage! The terminal blocks are live and can be highly dangerous due to
the risk of electric shock. All power supplies must be isolated before electrical installation is started. The
heat pump is connected internally at the factory, for this reason electrical installation consists mainly of
the connection of the power supply.
Warning! Electrical installation may only be carried out by an authorised electrician and must follow
applicable local and national regulations.
Warning! The electrical installation must be carried out using permanently routed cables. It must be
possible to isolate the power supply using a multi-pole circuit breaker with a minimum contact gap of 3
mm.
2.4 Water quality
Caution! A normal heating system always contains a certain amount of corrosion particulates (rust) and
sludge products from calcium oxide. This comes from acid that is naturally occurring in the fresh water
that the system is filled with. It is not good practice to have to fill the heating system regularly which is
why any leakage in the heating system should be repaired immediately. Normal filling should occur only
once or twice a year. The water in the heating system should be as clean as possible, always position the
dirt filter on the return line from the heating system to the heat pump, as close to the heat pump as
possible.
Caution! Hard water; Normally it is not a problem installing a heat pump in areas with hard water because
the normal operating temperature for the hot water does not exceed 60°C. In areas where there are
exceptional prevailing conditions with the water one can install a softening filter, which softens the water,
cleans any impurities and prevents the build up of calcification.
6 – Installation and service instructions VMGFI202
2.5 Commissioning
Caution! The installation may only be commissioned if the heating system is filled and all excessive air is
expelled. Otherwise the circulation pump may be damaged.
Installation and service instructions VMGFI202 – 7
3 Transport, delivery check and positioning
3.1 Transporting heat pump
Caution! The heat pump must always be transported and stored standing and in a dry environment. If the
heat pump is laid on the incorrect side it may become seriously damaged as the oil in the compressor can
run out in the pressure pipe and therefore prevent normal function.
Caution! Always secure the heat pump so that it cannot tip over during transportation.
3.2 Delivery check
1. Check that there is no transport damage.
2. Remove the packaging and check that the delivery contains the following components.
Table 1. Supplied contents
Quantity Name
1 Heat pump
1 Control unit with connection cord
1 Document set
1 Flexible hose for drainage of condensate water
2 1pc Buffer tank sensor, 1pc Domestic hot water tank sensor
3.3 Positioning the heat pump
3.3.1 Recommended location
When positioning the heat pump, note the following:
Caution! The heat pump must be installed outdoors and secured on a stable base, for example a cast
foundation. All four mounting points must be secured to the base.
Caution! Incorrect positioning of the heat pump risks reduction of performance.
•
Use M10 bolts for fastening the frame to the the base.
•
Select a position with good ventilation and with enough free space for installation and maintenenance.
•
Do not select a position that will block the air flow near the inlet or outlet areas.
•
No barrier allowed closer than 30 cm behind the unit.
•
Check with a spirit level that the heat pump is installed horizontally.
•
Ensure that condensated water is well drained from the unit. A flexible hose is available as accessory for drain-
age. If there is a freezing risk, use a heat cable inside the hose.
8 – Installation and service instructions VMGFI202
Figure 1. Positioning heat pump
Note! Avoid placing the heat pump near windows or walls to noise sensitive areas.
Note! Ensure that there is sufficient distance to neighbouring properties so that they are not exposed to
noise. Applicable local regulations must be followed.
Note! The heat pump should not be enclosed.
Note! Keep the heat pump and its immediate area free of snow, ice, leaves etc.
Installation and service instructions VMGFI202 – 9
4 The heat pump
4.1 Dimensions and connections
The dimensions and connections of the heat pump is described in the pictures and tables below.
1
2
3
Figure 2. Dimensions
Pos Description 6kW 8kW
1 Height 655 mm 755 mm
2 Width 1026 mm 1026 mm
3 Deepth 495 mm 495 mm
1
2
Figure 3. Piping connections (rear side)
Pos Description 6kW 8kW
1 Supply line
pipe (red label)
DN 20
DN 25
2 Return line pipe
(blue label)
DN 20
DN 25
10 – Installation and service instructions VMGFI202
4.2 Components
The principal components of the heat pump is shown in the picture below:
1
2
4
6
9
7
11
13
14
15
23
24
25
26
27
28
37
22
20
19
18
3
Figure 4. Components, exploded view
Position Explanation Position Explanation
1 Fan mesh/front grill 17 4-way valve
2 Fan 19 Expansion valve
3 Front panel 20 Water flow switch
4 Fan motor 22 Internal electrical heater
6 Left grill 23 High and Low pressure service ports
7 Evaporator 24 Heater exchanger
9 Electrical box, compressor capacitor, backup
heater relay, PCB, fan motor capacitor
25 Compressor
11 Top cover 26 High pressure valve
13 Rear grill 27 Pressure relief valve
14 Rear panel 28 Low pressure valve
15 Right side panel 37 Evaporator heating belt
4.2.1 Accessories
The following accessories are available for the product:
Installation and service instructions VMGFI202 – 11
•
Hot water tank electrical heater
•
Circulation pump
•
Reversing valve hot water
4.3 Principle function description
The heat pump can provide the following main functions:
•
House heating
•
Cooling
•
Domestic Hot Water (DHW)
•
Defrostning
•
Legionella prevention
•
Frost protection
To support these functions, suitable system solutions, including external components, must be selected at installa-
tion. An example of a such system solution is shown in Figure 6. Example, system solution Page 17.
When the heat pump works in AUTO mode, DHW is prioritized. When the water tank temperature decreases too
much, the unit will switch to DHW mode until the temperature setting is reached again. The unit will then switch
back to house heating or cooling.
For more details about the default settings in the control system, see the User manual.
4.3.1 House heating
The house heating function can run in AUTO or MANUAL mode.
AUTO mode
In AUTO mode, the water temperature is adjusted by the control system according to the selected heat curve, the
desired room temperature, and the outside air temperature (if it is within the heat pump´s working range between
-15°C to +43°C). The compressor stops when the water temperature has reached the setpoint in the control sys-
tem.
The heat pump has an internal electrical heater (3kW) for backup in situations where the compressor has stopped
for other reasons. According to the default settings in the control system, the internal electrical heater will start
running in the following conditions:
•
The control system discovers insufficient heating due to low outside air temperature (below -15°C).
•
The heat pump stops working as a protective measure and at the same time, the water temperature has not
reached its setpoint.
•
The heat pump is defrosting.
•
Frost protection (step 2)
In conditions with very low air temperatures and, at the same time, much hot water is required to meet the needs
of the household, an external heater is recommended. The location of this external heater has an impact on the
function and layout of the whole system solution as well as the start and stop conditions of the heat pump.
MANUAL mode
In MANUAL mode, the heat pump provides a constant water temperature according to the temperature settings in
the control system.
4.3.1.1 Start and stop conditions, internal electrical heater
The internal electrical heater will start in any of the following conditions:
•
During defrosting cycle (assuming that the parameter value in Menu 13 is set to 1= turned on).
•
During frost protection (step 2)
12 – Installation and service instructions VMGFI202
•
During house heating:
•
o
When the air temperature is below 0°C.
o
The system requests heating operation.
o
The buffer tank temperature has decreased more than the value set in Menu 08 and 30 minutes after the
compressor has started
o
After another 90 minutes;
-
If the air temperature is still below 0°C.
-
If the system still requests heating operation.
-
If the buffer tank temperature has decreased less than the value set in Menu 08.
-
If the buffer tank temperature still has not reached the temperature measured at compressor startup.
o
During house heating operation, if the heat pump has stopped as a protection due to a failure and the
system does not reach the temperature setting, an automatic start of the internal electrical heater is trig-
gered.
The internal electrical heater will stop in any of the following conditions:
•
If the DHW electrical heater in the water tank starts.
•
Water flow switch failure
•
Standby (and not going into frost protection, step 2)
•
Non house heating mode (for example, cooling)
•
Air temperature sensor failure
•
Buffer tank temperature sensor failure
•
Air temperature more than 0°C
•
The buffer tank temperature is higher than the temperature setting
4.3.1.2 Start and stop conditions, heating belts
When the outside temperature is low and to prevent freezing of refrigerant, heatings belts will start to work to
keep the temperatures in the heat pump withing a safe range.
4.3.1.2.1 Evaporator heating belt
The drain heater starts if all of the following conditions are fullfilled:
•
Power is on, and the operation is heating or domestic hot water
•
Compressor starts
•
The air temperature is below 1°C
The drain heater stops in any of the following conditions:
•
Non heating operation (for example, cooling)
•
Compressor has stopped for more than 30 minutes
•
The air temperature is higher than 4°C
4.3.2 Cooling
The heat pump can be set to cooling within an outside air temperature range between 8-43°C. Beyond this range
the heat pump will stop. In temperatures below 16°C, condensate problems may occur and which must be taken
care of by drainage solutions as well as isolation of water tanks and piping.
4.3.3 Domestic hot water
It is possible to produce Domestic Hot Water (DHW) by installing a heat system with a reversing valve and possibly
a hot water tank.
When the operation is house heating/DHW AUTO mode and the water temperature in the water tank decreases
more degrees than the allowed setting in the control system, the heat pump switches to produce hot water. When
the temperature reaches the setpoint again , the heat pump returns to house heating.
The maximum water temperature is 55°C. If the water temperature rises above 55°C, the heat pump will automati-
cally go into protection mode. Considering energy saving, it is recommended to set the DHW temperature below
55°C (60°C if there is an electrical heater installed inside the hot water tank).
Installation and service instructions VMGFI202 – 13
4.3.4 Defrosting
The heat pump has an automatic defrosting function that will start when the the ambient air temperature is low.
The heat pump will then calculate the best defrosting program depending on data collected from the temperature
sensors. As an option, defrosting can also be activated manually by the user.
Auto defrosting
The condition for auto defrosting is that the air temperature is less than 15°C and there is no failure of the coil
temperature sensor. In heating operation, when the coil temperature reaches the value set in menu 04, the defrost
starts and the compressor runs for the defrost cycle setting time in menu 03. Accumulated running time will be
cleared after the defrosting has stopped and a new cycle starts the next time defrosting is required.
Defrosting stops when the coil temp is more than the defrost stop temperature in menu 05 or when the defrost
time reaches the maximum setting specified in
menu 06.
Manual defrosting
When the air temperature is below 15°C and the compressor has run for more than 10 minutes, manual defrosting
can be activated using the key pad on the control unit The defrosting sequence will stop when the defrost time
setting or the defrost stop temperature has been reached.
The defrosting sequence is as follows:
•
Send out defrost signal and show symbol on operator panel
•
The three-way valve remains in the current position determined
by the current active operation mode.
•
Power on the 4-way valve switch.
•
Stop the fan.
•
The compressor still run.
•
The water pump runs as normal.
•
The internal electrical heater starts according to the setting in Menu 05 (if it is 0)
•
Drain heater is turned on, but controlled by its own conditions
When the defrosting stop conditions have been met, the heat pump will perform the following sequence:
•
Defrost signal ends and symbol on operator panel dissapear
•
The compressor still run
•
The fan starts.
•
After 30 seconds power off the 4-way valve switch
•
The three-way valve starts again if the domestic hot water function is active.
•
Accumulated running time of defrosting is cleared
•
The heat pump goes back to normal heating
Timer defrosting
When the air temperature is below the value set in MENU 05 and the coil temperature sensor is faulty, the heat
pump starts defrosting in intervals of 40 minutes of compressor running time.
The defrosting sequence stops after the defrosting time setting has been reached.
If the temperature sensor for the heat exchanger fails, a timer controlled defrosting cycle will start according to the
settings in the control system.
Defrosting abnormal termination
If the heat pump is switched off during the defrosting cycle, the defrosting will continue until the defrosting stop
condition has been met and then the heat pump stops.
In case of a high pressure protection situation during defrosting, defrosting stops and the heat pump shuts down
as a protection.
If there is a power failure during defrosting, when the power returns, the compressor will start testing the coil tem-
perature after 10 minutes of operation. If the defrost conditions are met, the heat pump will start to defrost.
Note! Low pressure protection is shielded during defrosting. After the defrosting has stopped and the
normal heating operation has started again, it takes 1 minute before the low pressure switch is tested.
14 – Installation and service instructions VMGFI202
4.3.5 Legionella prevention
There is an automatic legionella prevention when the heat pump function is set for DHW. Run at
00:00 after 7 days of operation. It will then heat up the hot water tank to 65 degrees for 15 minutes.
This is repeated once a week and kills any possible legionella bacterias in the water inside the
hot water tank.
4.3.6 Frost protection
There is an automatic frost protection function in the unit that works in two steps. When there is a risk of freezing
due to low temperatures, the unit will first start the water pump to create a water flow in the system. Next step is
to automatically start the heating operation.
•
Frost protection, step 1
When the operational status of the heat pump is Standby or powered ON, the outside ambient air temperature is
below 2°C, the return water temperature is below 8°C, the unit will automatically start operating in water pump
mode. It will exit the frost protection when the ambient air temperature is more than 3°C or the return water tem-
perature has reached over 10°C. When this protective function is triggered, the controller will display "Err 19", but
this is not a fault. The unit will automatically recover when the conditions meet the settings in the control system.
•
Frost protection, step 2
When the return water temperature is less than 6°C, the unit will automatically start heating operation. It will exit
step 2 protection when the ambient temperature is more than 3°C or the return water temperature is more than
15°C. When this protective function is triggered, the controller will display the "Err 18", but this is not a fault. The
unit will automatically recover when the conditions meet the settings in the control system.
When the operational status of the heat pump is Standby or powered ON, the machine will start domestic hot
water function compulsorily if water tank temperature is below 13°C; then exit and return to previous status when
the water temperature is more than 16°C. The controller will display "Err 18", but this is not a fault. The unit will
automatically recover when the conditions meet the settings in the control system again.
4.4 Check and safety functions
The heat pump has a number of safety functions to protect the installation against damage during abnormal oper-
ating conditions:
•
Water flow switch protection
•
Phase sequence fault/Overcurrent protection
•
Excessive temperature difference protection of outlet and return water
•
Internal heater overheat protection
•
High pressure protection
•
Low pressure protection
•
Outlet water temperature overheat protection
•
Outlet water temperature subcooling protection
•
Exhaust gas temperature overheat protection
•
Frost protection
Depending on the condition, the heat system will stop completely or electrical heaters will start and the system
continues to work but with limited capacity. Error codes will be displayed to inform the user about the problem.
When the abnormal condition seizes, this is detected by the control system and the heat pump begins to work
according to the settings in the control system.
Electrical system
The electrical panel inside the heat pump is fused with a 5A/250V AC fuse (dimension: 5*20; model: 522).
4.5 Heating curves
The heat pump will automatically adjust the water temperature according to the following:
Installation and service instructions VMGFI202 – 15
•
Different ambient air temperatures
•
Selected heat curve
•
Desired room temperature setting
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
444546474849
50
-2 0
-1 8
-1 6
-1 4-1 2-1 0- 8- 6
- 4
- 2024681012
1416
18
2022
2426
48
50
44
46
42
36
38
40
34
32
30
28
26
24
22
20
18
16
14
12
1
2
3
4
Figure 5. Heat curves and heat pump working range in AUTO mode
Position Explanation
1 Initial supply line temperature (°C)
2 Supply line water temperature (°C)
3 Working range in AUTO mode
4 Outdoor Air temperature (°C)
Note! The reference point for the heat curves is an outside air temperature of -6°C.
When the outside air temperature is -6°C, selecting heat curve 45 and AUTO mode means that the heat pump will
adjust the water temperature to 45°C. Heat curve 45 is suitable for radiator heating.
16 – Installation and service instructions VMGFI202
5 System solution
5.1 System solution
An example of a system solution with heat pump, hot water tank, and buffer tank is shown in the picture below.
3
5
6 7
38
4
8
9
5
14
11
12
13
2
1
2
15
10
17
18
B
A
AB
16
Figure 6. Example, system solution
Position Explanation Position Explanation
1 Heat pump 10 Hot water
2 Flexible hoses 11 Temperature and pressure valve
3 Control unit 12 Temperature sensor
4 Circulation pump 13 Hot water tank electrical heater
5 Safety valve 14 Hot water tank (optional)
6 Expansion vessel 15 Buffer tank (optional)
7 Strainer 16 Temperature sensor
8 Reversing valve hot water 17 Supply line
9 Cold water 18 Return line
38 External electrical heater
Note! The illustration of the system solution is only an example and may vary between different
installations.
Installation and service instructions VMGFI202 – 17
6 Piping installation
6.1 Pipe connection
Caution! There is a risk of the pipes to the heat pump freezing when water circulation through the heat
pump stops when outdoor temperatures fall below freezing. Normally the integrated flow sensor gives an
alarm if there is low flow (assumes that there is current to the heat pump), for example when the radiator
pump has stopped. In the event of longer flow stops, for example in case of power failure or if the plant is
OFF, there is however an obvious risk of freezing. By installing a drain plug on the inside of the house wall
it is possible to drain the part of the system that goes out to the heat pump if necessary. Another way of
ensuring against freezing is to install an intermediate exchanger indoors. In such cases one must use
glycol intended for refrigerant applications in the circuit to the heat pump unit and an extra circulation
pump, see System solution intermediate exchanger. Another option is to fill the heating system with anti-
freeze.
Caution! To prevent leaks, ensure that there are no stresses in the connecting pipes!
Caution! It is important that the excessive air is expelled from the heating system after installation. Bleed
valves must be installed where necessary.
Caution! Heating systems with closed expansion tanks must also be supplied with approved pressure
gauges and safety valves.
Caution! Cold and hot water pipes and overflow pipes from safety valves must be made of heat resistant
and corrosion-resistant material, e.g. copper. The safety valve overflow pipes must have an open
connection to the drain and visibly flow into this in a frost-free environment.
Caution! The connecting pipe between the expansion tank and the safety valve must slope continuously
upwards. A continuous upwards slope means that the pipe must not slope downwards from the
horizontal at any point.
Note! Ensure that the pipe installation is carried out in accordance with the dimensions and connection
diagrams.
Caution! A 6,8 bar safety valve must be installed in the system solution.
Note! It is recommended to have a circulation pump in the system solution.
6.2 Connecting cold and hot water lines
If necessary, connect the cold water (9) and hot water (10) pipes with all the necessary components to the hot
water tank, see Figure 6. Example, system solution Page 17.
18 – Installation and service instructions VMGFI202
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Danfoss DHP-AT Installation guide

Danfoss
Brand
Danfoss
Model
DHP-AT
Category
Heat pumps
Type
Installation guide

Danfoss DHP-AT is an air to water heat pump that can be used for heating and cooling your home. It is a highly efficient and environmentally friendly way to heat and cool your home, as it uses renewable energy from the air. The heat pump is also very quiet, so it will not disturb you or your family.

Here are some of the features of the Danfoss DHP-AT:

  • Heating and cooling: The heat pump can be used to heat your home in the winter and cool it in the summer.
  • High efficiency: The heat pump is very efficient, so it will save you money on your energy bills.
  • Environmentally friendly: The heat pump uses renewable energy from the air, so it is an environmentally friendly way to heat and cool your home.
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