Danfoss DHP-AT Bedienungsanleitung
MAKING MODERN LIVING POSSIBLE
User Guide
DHP-AT
www.heating.danfoss.com
The English language is used for the original instructions.
Other languages are a translation of the original instructions.
(Directive 2006/42/EC)
© Copyright Danfoss A/S
Table of Contents
1 Foreword ............................................... 4
2Safety precautions ......................................... 5
2.1 Installation and maintenance ................................ 5
2.2 System modifications .................................... 5
2.3 Safety valve .......................................... 5
3About your heat pump ....................................... 6
3.1 Components ......................................... 6
3.2 Main functions ........................................ 7
3.3 Internal electrical heater ................................... 9
3.4 Freeze protection ....................................... 9
4Control system ........................................... 10
4.1 Keypad ............................................. 11
4.2 Indicator ............................................ 11
4.3 Display ............................................. 11
5 Menu information ......................................... 13
6 Turning power ON/OFF ...................................... 14
7 Settings and adjustments ..................................... 15
7.1 Lock/unlock user interface ................................. 15
7.2 Changing operation mode ................................. 15
7.3 Adjusting DHW temperature ................................ 15
7.4 Changing heat curve and desired room temperature .................. 16
7.5 Setting current time ..................................... 16
7.6 Timer settings ......................................... 17
7.7 Changing mode from AUTO to MANUAL ......................... 17
7.8 Adjusting the indoor temperature in MANUAL mode .................. 18
7.9 Manual defrosting ...................................... 18
7.10 Default settings ........................................ 18
8 Regular checks ........................................... 21
8.1 Checking operation ..................................... 21
8.2 Check the water level in the heating circuit ........................ 22
8.3 Checking safety valves .................................... 22
9 References .............................................. 23
9.1 Checklist ............................................ 23
10 Installation protocol ........................................ 25
11 Service Sheet ............................................ 26
User Guide DHP-AT
Danfoss Heating Solutions VUGFC302 3
1 Foreword
Buying a heat pump from Danfoss is an investment in a better future.
A Danfoss heat pump is classed as a renewable energy source, which
means that it is considerate of our environment. It is a safe and convenient
solution that provides heating, hot water and in certain cases cooling, for
your home at a low cost.
We thank you for the confidence that you have shown in us by buying a
heat pump from Danfoss. We hope that you will benefit from it for many,
many years to come.
With best wishes
Danfoss Heat Pumps
User Guide DHP-AT
VUGFC302 Danfoss Heating Solutions
4
2 Safety precautions
2.1 Installation and maintenance
Danger Only authorized installers may install, operate and perform maintenance and re-
pair work on the unit.
Danger Only authorized electricians may modify the electrical installation.
Danger Only authorized refrigeration technicians may perform work on the refrigerant
circuit.
2.2 System modifications
Only authorized installers are allowed to perform modifications on the following components:
▪The heat pump unit
▪Water and electrical installations
▪The safety valve
Do not make any constructions / installations that may affect the operational safety of the heat pump.
2.3 Safety valve
The following safety precautions apply to the safety valve in the hot water circuit and corresponding overflow
pipe:
▪Do not block the outlet on the overflow pipe from the safety valve.
▪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.
User Guide DHP-AT
Danfoss Heating Solutions VUGFC302 5
3 About your heat pump
3.1 Components
1
2
61
0
57
43
1 Air inlet
2 Air outlet
3 Return line
4 Supply line
5 Operator panel
6 Hot water tank sensor and buffer tank sensor
7 Power supply example (local and national
regulations must be applied)
User Guide DHP-AT
VUGFC302 Danfoss Heating Solutions
6
3.2 Main functions
The heat pump can provide the following functions:
▪House heating for radiators or under-floor heating
▪Domestic Hot Water (DHW)
▪Cooling
▪Defrosting in cold weather conditions
▪Frost protection
▪Legionella prevention
Most of these functions are automatically controlled by the control system according to the need from the
household or ambient temperatures.
Cooling must be initiated manually from the key pad by the user. The heat pump behaviour is still automatical-
ly controlled by the control system.
The default function when starting the heat pump for the first time is house heating/DHW automatic mode.
The production of hot water is prioritized. When the hot water temperature reaches the set point, the heat
pump automatically switches to house heating or cooling depending on the user settings.
The heating system is normally configured for automatic house heating/DHW at commissioning. An appropri-
ate heating curve and a desired room temperature are selected by the installer. The heat pump will adjust the
house heating water temperature in accordance with the outside air temperature. The maximum water tem-
perature for house heating is 50°C running on compressor only. If higher temperature is required, the external
electrical heater is used to reach the set point. The AUTO mode is for both comfortable house heating and en-
ergy saving.
The heating function can be set to MANUAL mode, then the heat pump will produce a constant supply line
temperature following the setting in the control system.
The picture below shows a simplified view of the recommended heating curves and the temperature working
range in AUTO mode.
User Guide DHP-AT
Danfoss Heating Solutions VUGFC302 7
34
-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
45
1
2
3
4
1 Initial supply line temperature
2 Supply line water temperature
3 Working range in AUTO mode
4 Outdoor ambient air temperature
The recommended heating curves for radiator heating are curves 43-45. The recommended heating curves for
under-floor heating are curves 32-34.
N
The outside air temperature reference point for the heat curves is -6 °C.
Cooling
When the function is manually set to cooling, the machine will lower the indoor temperature. Note that the
cooling capacity will decrease as the outdoor temperature increases.
Adjustable cooling supply line temperature range: 8-28°C. (Default cooling temperature is 12°C)
If the supply line water temperature drops below 2 °C in cooling mode the machine will stop. This to prevent
inside components from freezing. Error code 13 will be displayed.
User Guide DHP-AT
VUGFC302 Danfoss Heating Solutions
8
Domestic hot water
The prioritized function is Domestic Hot Water (DHW). When the water temperature reaches the set point, the
heat pump automatically switches to house heating. The maximum water temperature for DHW is 55°C run-
ning on compressor only. If higher temperature is required, the DHW tank electrical heater is used to reach the
set point. Maximum DHW temperature is 60°C. (Default DHW temperature is 50°C)
Defrosting
The heat pump will calculate and process the best defrosting programme depending on data collected from
the temperature sensors.
During defrosting, components will start and stop at intervals (this is normal behaviour).
Defrosting can also be activated manually, this is only recommended when AUTO defrosting is not sufficient.
This usually happens in the temperature interval -5 to +5 °C and when outside air humidity is high. Under these
conditions can heavy icing occur.
Legionella prevention
DHW tank with built-in electrical heater
There is an automatic legionella prevention when the heat pump function is set to DHW. The automatic legion-
ella prevention runs at 00:00 every 7:th day of operation. The maximum water temperature for DHW is 55°C
running on compressor only. The water in the hot water tank will be heated to 65 °C for 15 minutes, using the
hot water tank electrical heater. This will kill any possible legionella bacteria inside the hot water tank.
DHW tank without built-in electrical heater
There is an automatic legionella prevention when the heat pump function is set to DHW. The automatic legion-
ella prevention runs at 00:00 every 7:th day of operation. The water in the hot water tank will be heated to 55 °C
for 3 hours then returns back to previous operating mode.
3.3 Internal electrical heater
The internal electrical heater is used in situations when the heating from the heat pump is insufficient due to
low air temperature or when the heat pump itself has stopped.
The electrical heater will start in the following conditions:
▪The system discovers insufficient heating from the heat pump.
▪The heat pump stops (for protection) due to a failure, and at the same time, the water temperature has
not reached the set point.
▪The heat pump is in defrosting mode.
▪During freezing protection, step 2.
▪Manually started by user
3.4 Freeze protection
As long as there is power supplied to the heat pump, an automatic freeze protection function will prevent in-
side components from freezing.
When this protective function is triggered, the controller will display either "Err 18" or "Err 19" depending on
the temperature in the system, this is not a fault. The unit will automatically recover once the conditions in the
control system is met.
User Guide DHP-AT
Danfoss Heating Solutions VUGFC302 9
4 Control system
The heat pump has an integrated control system which automatically calculates the heat or cooling demands
in the house to ensure desired temperature.
The operator panel has a keypad (4) for user interaction and the information is presented in a display (1) above
the keypad (4) and by the indicator (2) beside the power ON/OFF button (3).
1
2
3
4
CC
Fig. 1: Operator panel
1 Information symbols
2 Indicator
3 Power ON/OFF button
4 Keypad
User Guide DHP-AT
VUGFC302 Danfoss Heating Solutions
10
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