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)
© 2011 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 ............................................................... 6
3.3 Internal electrical heater ......................................................... 8
3.4 Freeze protection ............................................................. 8
4Control system .................................................................. 9
4.1 Keypad .................................................................... 9
4.2 Indicator ................................................................... 9
4.3 Display .................................................................... 10
5 Menu information ................................................................ 11
6 Turning power ON/OFF ............................................................ 12
7 Settings and adjustments ........................................................... 13
7.1 Lock/unlock user interface ....................................................... 13
7.2 Changing operation mode ....................................................... 13
7.3 Adjusting DHW temperature ...................................................... 13
7.4 Changing heat curve and desired room temperature ...................................... 13
7.5 Setting current time ........................................................... 14
7.6 Timer settings ............................................................... 14
7.7 Changing mode from AUTO to MANUAL .............................................. 15
7.8 Adjusting the indoor temperature in MANUAL mode ...................................... 15
7.9 Manual defrosting ............................................................. 15
7.10 Default settings .............................................................. 16
8 Regular checks .................................................................. 17
8.1 Checking operation ............................................................ 17
8.2 Check the water level in the heating circuit ............................................. 17
8.3 Checking safety valves .......................................................... 18
8.4 Cleaning strainer ............................................................. 18
9 References ..................................................................... 19
9.1 Checklist ................................................................... 19
10 Installation protocol .............................................................. 21
11 Service Sheet ................................................................... 22
User Guide DHP-AT
Danfoss Heating Solutions VUGFC20202 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 consid-
erate of our environment. It is a safe and convenient solution that provides heating, hot wa-
ter 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
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2 Safety precautions
2.1 Installation and maintenance
Danger Only authorized installers may install, operate and perform maintenance and repair 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 your-
self.
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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)
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 tem-
peratures.
Cooling must be initiated manually from the key pad by the user. The heat pump behaviour is still automatically controlled by the con-
trol 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.
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The heating system is normally configured for automatic house heating/DHW at commissioning. An appropriate 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 temperature for house heating is 50°C. The AUTO mode is for both comfortable
house heating and energy 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.
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.
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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 de-
crease as the outdoor temperature increases.
Adjustable cooling supply line temperature range: 8-18 °C.
If the supply line water temperature drops below 2 °C the machine will stop. This to prevent inside components from freezing.
Error code 13 will be displayed.
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.
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
There is an automatic legionella prevention when the heat pump function is set to DHW. The automatic legionella prevention runs at
00:00 every 7:th day of operation. 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.
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.
3.4 Freeze protection
As long as there is power supplied to the heat pump, an automatic freeze protection function will prevent inside 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.
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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
4.1 Keypad
The keypad is used to navigate through the different menus, to select features and lock / unlock the user settings
10
1
23456
7
89
Fig. 2: Keypad buttons
1 Heating/cooling switch
2 Down
3 Up
4 House heating/cooling (function on/off)
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.
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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 heating/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 appear-
ance 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
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.
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