Danfoss DHP-AT User manual

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

4.1 Keypad
The keypad is used to navigate through the different menus, to select features and lock / unlock the user set-
tings
10
1
23456
7
89
Fig. 2: Keypad buttons
1 Switch between heating and cool-
ing mode
2 Down
3 Up
4 Switch on/off house (heating/
cooling) function
5 Clock
6 Lock/unlock
7 Timer on
8 Timer off
9 Domestic hot water (function on/
off)
10 Internal electrical heater
4.2 Indicator
The indicator next to the power ON/OFF button on the operator panel is lit green when power is supplied and
the operator panel is connected to the heat pump. When the heat pump is started (using the power button), it
is confirmed by a symbol on the display.
4.3 Display
During normal operation, the upper part of the display shows the currently active functions.
The bottom part of the display shows the temperatures in the buffer tank and the hot water tank. If house heat-
ing/cooling or DHW has been turned off, this part of the display will be empty. If the menu system is entered
using the keypad or if an error occurs, the appearance of the display will change.
The following information is available:
C
C
16
17
13
12 3 4 5 6 7 8 910 11 12
14
15
User Guide DHP-AT
Danfoss Heating Solutions VUGFC302 11

1 Heating
2 Cooling
3 Defrosting
4 Internal electrical heater
5 Alarm
6 House heating
7 Domestic Hot Water (DHW)
8 Interface locked
9 Clock
10 Timer on
11 Timer off
12 Current time
13 Indicator for DHW function
14 Indicator for hot water tank electrical heater
15 Hot water tank temperature
16 Buffer tank water temperature
17 Indicator for house heating/cooling function
The display shows the available menus and the default or configured settings.
User Guide DHP-AT
VUGFC302 Danfoss Heating Solutions
12

5 Menu information
The control system has 30 menus, numbered 00-29. Parameters 00 to 19 in the menu have a default adjustable
value, depending on if the operating mode is AUTO or MANUAL. Menus 20 to 29 displays measured values.
When the heat pump is in house heating/DHW automatic operation, the information is presented as in the pic-
ture below.
C
C
Viewing other settings
Other settings in the control system can be reviewed by navigating through the 30 available menus.
1. To enter a menu , press for 5 seconds. The menu and parameter digits start to flash.
2. Before the flashing stops, press the or buttons to navigate between the menus.
The current parameter value for a menu setting is displayed in the right-hand side of the window. The default
value can be found further on in this user guide.
User Guide DHP-AT
Danfoss Heating Solutions VUGFC302 13

6 Turning power ON/OFF
The heat pump is normally started by the installer when installing and commissioning the system. If it is neces-
sary to start or stop the heat pump, use the power ON/OFF button, (3) on the keypad.
The heat pump is connected to the mains via a safety switch (circuit breaker).
Warning If the power supply is switched on, the unit is in so called standby mode even if it
is turned OFF on the keypad. In standby mode, the unit may still operate if it en-
ters freeze protection mode. To completely turn off the heat pump, the mains
safety switch must be switched off.
The indicator (2) on the operator panel is lit green when the operator panel is powered on and connected to
the control system. If the heat pump is turned off, only current time is displayed.
When the heat pump is turned on from the operator panel (3), the current operation and status will be dis-
played.
1
2
3
4
CC
User Guide DHP-AT
VUGFC302 Danfoss Heating Solutions
14

7 Settings and adjustments
By default, the heat pump function is set to automatic house heating/DHW. The default heat curve is 43 and
the desired room temperature is 20 °C.
The factory configured mode and parameter settings in the control system can be adjusted to fit the current
system solution and different customer requirements.
N
There is no reset function. If the default factory settings (parameter values) are
changed, the only way to return to the default settings is to manually set the val-
ues presented in section Default settings.
7.1 Lock/unlock user interface
To lock or unlock the user interface, press for 5 seconds.
7.2 Changing operation mode
To change the default operation mode, from house heating/DHW AUTO to cooling, press on the key pad.
Navigate to Menu 01 and select the desired room temperature using the or buttons.
In the default house heating/DHW AUTO mode, pressing on the keypad more than 5 seconds stops the
DHW production and puts the heat pump in house heating operational mode.
N
The value shown in the display is the present tap water temperature. Press the
symbol for less than 5 seconds and the preset temperature is shown.
If pressing the button for more than 5 seconds, the house heating function is turned off.
N
The value shown in the display is the present supply line/buffer tank tempera-
ture. Press the symbol for less than 5 seconds and the preset temperature is
shown.
7.3 Adjusting DHW temperature
1. To change the default setting of the DHW tank temperature, press . The temperature setting starts
to flash.
2. Use the or buttons to change the temperature.
3. Wait 5 seconds (the figures stop flashing) for the temperature value to be set.
User Guide DHP-AT
Danfoss Heating Solutions VUGFC302 15

7.4 Changing heat curve and desired room temperature
Changing heat curve and desired room temperature is only available in AUTO mode.
Heat curve
1. To select another heating curve, press for 5 seconds.
2. Use or buttons to navigate to Menu 00.
3. Press again.
4. Use or buttons to select a new heating curve (range is 24-50).
5. Press again and wait 5 seconds.
Desired room temperature
1. To select the initial desired room temperature, press for 5 seconds.
2. Use or buttons to navigate to Menu 01.
3. Press again.
4. Use or buttons to select the initial desired room temperature.
5. Wait 5 seconds for the change to be saved.
7.5 Setting current time
1. To change the default time setting, press .
2. While the symbols are flashing adjust the default hour setting by using the or buttons.
3. Press again.
4. Use or buttons to change the default minute setting.
5. Before the flashing stops, press again or wait 5 seconds to save the settings.
User Guide DHP-AT
VUGFC302 Danfoss Heating Solutions
16

7.6 Timer settings
The heat pump can start and stop according to timer settings in the control system.
Setting Timer ON
1. To set Timer ON, press .
2. Use or buttons to change the default hour setting for Timer ON.
3. Press again.
4. Use or buttons to change the default minute setting for Timer ON.
5. Press before the flashing stops or wait 5 seconds.
Setting Timer OFF
1. To set Timer OFF, press .
2. Use or buttons to change the default hour setting for Timer OFF.
3. Press again.
4. Use or buttons to change the default minute setting for Timer OFF.
5. Press before the flashing stops or wait 5 seconds.
Cancelling Timer settings
1. To cancel timer settings, press either or .
2. Press before the flashing stops.
7.7 Changing mode from AUTO to MANUAL
1. To change from AUTO to MANUAL mode, press for 5 seconds.
2. Press or to navigate to Menu 02.
3. Press the again.
4. Press to select value 0 for MANUAL mode.
5. Press again or wait 5 seconds.
6. To lock the mode, press for 5 seconds.
User Guide DHP-AT
Danfoss Heating Solutions VUGFC302 17

7.8 Adjusting the indoor temperature in MANUAL mode
In MANUAL mode, the control system can only adjust the water out temperature which in turn will affect the
room temperature.
1. To change the water temperature. press and adjust the temperature with the or
buttons.
2. Press again to save the settings.
7.9 Manual defrosting
Manual defrosting should only be initiated when the automatic defrosting function is not sufficient (heavy
icing on the outdoor unit).
To start a manual defrosting cycle, press and simultaneously for 5 seconds. If all defrost conditions
are fulfilled, the defrost symbol
will be displayed in the information window. An air temperature below
15°C is required and the compressor must have been running for at least 10 minutes.
N
If the defrost symbol disappears almost immediately, the defrosting criteria are
not met and defrosting will not start.
When the defrosting cycle is finished, the symbol
will disappear from the information window.
7.10 Default settings
The default DHW temperature is set to 50°C.
The following table shows the other default settings in the control system:
Menu Description Default value Range
00 Auto heating curve (value 43 relates to the number
of the curve and has no units of measure, A indicates
that it is in automatic mode only)
A43 A24—50
01 Initial (desired) room temperature 20 °C 15—25 °C
02 House heating mode 1 1=Auto
0=Manual
03 Defrosting cycle 40 min 30—90 min
04 Coil temperature threshold for starting defrosting -6 °C From -20 °C to +5 °C
05 Coil temperature threshold for stopping defrosting 13 °C 1—30 °C
06 Maximum defrosting period 12 min 1—12 min
User Guide DHP-AT
VUGFC302 Danfoss Heating Solutions
18

Menu Description Default value Range
07 Domestic hot water hysteresis setting (i.e. number of
degrees below set point where the DHW will start
again)
5 °C 1—20 °C
08 Heating hysteresis setting (i.e number of degrees
below set point where the heating will start again) 2 °C 1—20 °C
09 Overheating of electronic expansion valve in heat-
ing mode 2 °C From -20 °C to +20 °C
10 Overheating of electronic expansion valve in cooling
mode 3 °C From -20 °C to + 20 °C
11 Time delay for compressor start-up after power-up
(for example, after a power cut-off) 1 min* 1—10 min
12 Circulation pump operation mode 1 1=Switched off when heating
temperature has been
reached.
0=Continuous operation
13 Internal electrical heater operation during defrost-
ing 1 1= Turned on 0=Turned off
14 Automatic legionella protection function 1 1=Activated
0=Deactivated
15 Internal electrical heater start option 0 0=Auto
1=Air-temperature condition
set in menu 16
2=Water temperature condi-
tion set in menu 17
3= Conditions 1 and 2 must be
met
16 Air temperature restriction for when internal electri-
cal heater can manually be started, that is, must be
lower than this value.
-5 °C From -15 °C to +7 °C
17 Additional hysteresis in relation to menu 08 for
when internal electrical heater can manually be star-
ted.
2 °C 0—13 °C
18 Additional temperature hysteresis for hot water tank
electrical heater in relation to menu 07 for when the
electrical heater will start.
5 °C 0—20 °C
19 Hot water tank electrical heater startup delay 30 min 30—90 min
20 Return water temperature Measured val-
ue From -30 °C to +99 °C
21 Supply water temperature Measured val-
ue From -30 °C to +99 °C
22 Coil temperature in heating mode (T7) Measured val-
ue From -30 °C to +99 °C
23 Coil temperature in cooling mode (T8) Measured val-
ue From -30 °C to +99 °C
User Guide DHP-AT
Danfoss Heating Solutions VUGFC302 19

Menu Description Default value Range
24 Air temperature (T1) Measured val-
ue From -30 °C to +99 °C
25 Hot water tank temperature (T3) Measured val-
ue From -30 °C to +99 °C
26 Buffer tank temperature (T2) Measured val-
ue From -30 °C to +99 °C
27 Return gas temperature of compressor (T5) Measured val-
ue From -30 °C to +99 °C
28 Exhaust gas temperature of compressor (T4) Measured val-
ue From -30 °C to +99 °C
29 Shows the number of the operation steps for the ex-
pansion valve Measured val- ue 100—480 steps
* Should not be modified.
User Guide DHP-AT
VUGFC302 Danfoss Heating Solutions
20