Nordic R290 Propane Air to Water Heat Pumps
User Manual for models 7kW to 22kW
1.0 Foreword
This heat pump is manufactured to strict design and manufacturing standards to ensure high quality, strong reliability, and overall product excellence. This manual contains all necessary information regarding installation, troubleshooting, purging, and maintenance. Please read this guide carefully before commissioning and maintaining the product.
The manufacturer of this product cannot be held responsible for any injury to persons or damage to the unit resulting from incorrect installation, faulty operation, or improper maintenance not in accordance with this manual.
It is crucial that the following instructions are adhered to at all times to maintain the warranty. The unit should only be opened or repaired by a qualified installer or authorized dealer. Maintenance must be performed according to the recommended time and frequency specified in this manual. Use only original spare parts.
An air-to-water heat pump is an efficient and energy-saving heat source, primarily used for domestic heating. It can be connected to various heating systems such as underfloor heating, radiators, etc. The monobloc heat pump can be connected to different indoor units. The air-to-water heat pump is designed to heat water for sanitary purposes.
2.0 Safety Instructions
To use this unit correctly and prevent accidents for users and repair personnel caused by the unit, please read this manual carefully.
Symbol Explanations:
| Symbol | Explanation |
|---|---|
| ? | Prohibited: Actions that are forbidden will be near this symbol. |
| ℹ️ | Necessary Action: Actions that must be performed. |
| ❗ | Warning: Pay attention to the sign. |
Operational Safety:
| Operation | Explanation |
|---|---|
| ? Do not insert fingers or other objects into the fan or evaporator, as this may cause personal injury or damage the unit. | |
| ℹ️ Power Off: If unusual noises or smells occur, turn off the power supply. Continued operation may cause short circuits or fire. |
Repair Safety:
| Operation | Explanation |
|---|---|
| ❗ Caution: Installation of the unit must only be performed by qualified personnel. Incorrect installation can lead to leaks, electric shock, fire, or personal injury. | |
| ❗ Caution: Only qualified personnel should perform repairs on the unit. Otherwise, there is a risk of electric shock or fire. | |
| ? Prohibited: When the unit requires repair, contact qualified personnel to perform the work. Otherwise, there is a risk of water leakage, electric shock, fire, or personal injury. |
Use only cleaning agents recommended by the manufacturer for cleaning the evaporator. Do not use agents to accelerate the defrosting process.
❗ The unit must be stored and installed at a safe distance from ignition sources such as gas burners, fireplaces, electric heaters, or anything else that could cause sparks.
Installation Safety:
| Installation Aspect | Explanation |
|---|---|
| ❗ Installation Location: The unit must not be installed near gas burners or any other flame-producing equipment. If the unit leaks, a fire may occur. | |
| ❗ Foundation: Ensure the unit's foundation is sufficiently strong to prevent the unit from tipping over or moving. | |
| ❗ Circuit Breaker: Always install a safety circuit breaker in front of the unit; otherwise, there is a risk of electric shock or fire. | |
| ❗ Foundation Check: Regularly check the unit's foundation to prevent damage to the unit or personal injury. | |
| ℹ️ Power Off: Turn off the power when cleaning and maintaining the unit. | |
| ? Prohibited: Only authorized installers may perform dimensioning and install the electrical installation for the unit. |
❗ Never use flame-producing equipment near the unit, as it can cause a fire.
3.0 Features
This series of heat pumps offers the following features:
- 3.1 Advanced Control: The computer-based control system is accessible to the user, allowing them to review and set the unit's operating parameters. Control can be accessed and set via PC if a DTU/WIFI module is installed.
- 3.2 Simple Installation: The monobloc unit has a built-in water pump, making installation very straightforward.
- 3.3 Flexible Installation: The unit's construction and design facilitate simple and easy installation.
- 3.4 Efficient Heat Transfer: The heat exchanger in the unit is specially designed to improve efficiency.
- 3.5 Wide Operating Range: The heat pump series is designed to operate under various temperature conditions, down to -25 degrees Celsius.
4.0 Dimensions (mm)
4.1 Models: NOR-R290-700/900-230
Dimensions: 1167 x 407 x 795 mm
4.2 Models: NOR-290-1200/1400-400
Dimensions: 1287 x 458 x 928 mm
4.3 Models: NOR-R290-1800/2200-400
Dimensions: 1250 x 540 x 1330 mm (approximate, based on visual representation)
5.0 Models
Technical specifications for the Nordic R290 heat pump series:
| Model | NOR-R290-700-230 | NOR290-900-230 | NOR290-1200-400 | NOR290-1500-400 | NORR290-1800-400 | NOR-R290-2200-400 |
|---|---|---|---|---|---|---|
| Heating Capacity* (kW) | 7 | 9 | 12 | 15 | 18 | 22 |
| *Ambient 7°C, Water In/Out 30-35°C | ||||||
| Cooling Capacity* (kW) | 3 | 5 | 7 | 10 | 12 | 15 |
| *Ambient 35°C (DB), Water In/Out 12-7°C | ||||||
| Domestic Hot Water Capacity* (kW) | 5 | 10 | 15 | 18 | 22 | 27 |
| *Ambient 20°C (DB), Water In/Out 15-55°C | ||||||
| Operating Range - Ambient Temperature (°C) | -25 to 43 | -25 to 43 | -25 to 43 | -25 to 43 | -25 to 43 | -25 to 43 |
| Electrical Data | ||||||
| Supply (V) | 230 | 230 | 380 | 380 | 380 | 380 |
| Fuse (Amp) | 16 | 16 | 16 | 16 | 16 | 16 |
| Water System | ||||||
| Max Delivered Water Temperature (°C) | 70 | 70 | 70 | 70 | 70 | 70 |
| Water Pump | Grundfos | Grundfos | Grundfos | Grundfos | Grundfos | Grundfos |
| Circulated Water Flow Rate (m³/h) | 1.0 | 1.0 | 1.7 | 1.7 | 1.9 | 1.9 |
| Water Connection (Inch) | 1" | 1" | 1" | 1" | 1" | 1" |
| Refrigerant System | ||||||
| Refrigerant | R290 | R290 | R290 | R290 | R290 | R290 |
| Refrigerant Charge (g) | 500 | 500 | 850 | 850 | 1300 | 1300 |
| Operating Pressure (Low Side) (MPa) | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| Operating Pressure (High Side) (MPa) | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 |
| CO2 Equivalent (Ton) | 0.0015 | 0.0015 | 0.0026 | 0.0026 | 0.0039 | 0.0039 |
| Materials, Weight & Dimensions | ||||||
| Cabinet | Galvanized Steel | Galvanized Steel | Galvanized Steel | Galvanized Steel | Galvanized Steel | Galvanized Steel |
| Dimensions (mm) | 1167 x 407 x 795 | 1167 x 407 x 795 | 1287 x 458 x 928 | 1287 x 458 x 928 | 1250 x 540 x 1330 | 1251 x 540 x 1330 |
| Weight (Kg) | 80 | 80 | 160 | 160 | 202 | 202 |
| Noise | ||||||
| Sound Power Level (EN12102) (dB) | 57 | 57 | 58 | 58 | 62 | 62 |
| Sound Pressure Level (1m) (dB(A)) | 43 | 43 | 44 | 44 | 47 | 47 |
6.0 Display and User Guide
The following describes the front panel, display, and functions:
- Display during startup: When power is turned on to the system.
- Front Panel: This is the first screen seen when operating the system.
Description of Functions and Corresponding Illustrations:
| Illustration No. | Illustration Description | Function |
|---|---|---|
| (1) | Lock Screen | Press this icon to lock the screen. White symbol = screen locked. Blue symbol = screen unlocked. |
| (2) | Home Icon | Swipe on the screen to navigate between pages. |
| (3) | Domestic Hot Water Temperature | Icon displayed when the heat pump is in domestic hot water mode. |
| (4) | On/Off | Press this icon to turn the heat pump on or off. |
| (5) | Temperature Setting | Press this icon to set the desired temperature. |
| (6) | Temperatures | Outlet, inlet, room, or buffer temperatures. |
| (7) | Target Temperature | Desired temperature. |
| (8) | Error Icon | The icon will flash if there is an error in the system. Pressing the icon displays the error messages page. |
| (9) | Defrost | Displayed when the heat pump is defrosting. |
| (10) | Time Setting | Displayed only if time setting is activated. |
| (11) | Timer Function | Displayed only if the timer function is connected. |
| (12) | Outdoor Temperature | Outdoor air temperature. |
| (13) | Time and Date | Current time and date. |
| (14) | Mode | Mode selection. |
| (15) | Mode Selection | Press the icon to select between: Domestic Hot Water mode, Heating mode, Cooling mode, Domestic Hot Water + Heating mode, Domestic Hot Water + Cooling mode. |
4. Turning the unit on/off:
The On/Off icon is white when off. Blue icon when on. Pressing the icon turns the heat pump on or off.
5. Mode Selection:
Five different modes can be selected:
| Mode Number | Description |
|---|---|
| (1) | Domestic Hot Water Heating |
| (2) | Heating Mode |
| (3) | Cooling Mode |
| (4) | Domestic Hot Water Heating + Heating Mode |
| (5) | Domestic Hot Water Heating + Cooling Mode |
Note: a) If the heat pump does not have a cooling function, cooling mode cannot be selected. b) If the heat pump does not have a domestic hot water heating function, this mode cannot be selected.
6. Setting Desired Temperature:
Example: Domestic Hot Water Heating + Heating Mode
- Return to the home screen.
- Press the "Desired Temperature" icon on the home screen to set the desired temperature. Rotating the icon changes the temperature.
- Save changes.
7. Screen Lock/Unlock:
Press the padlock icon to lock/unlock screen functionality. A pop-up screen will appear requiring a code to unlock the screen.
Note: The password for screen lock is 22 or 022.
8. Settings and Display:
Swipe from right to left on the screen. Here you can select settings or view the heat pump's functions.
| Icon Number | Icon Name | Function |
|---|---|---|
| (1) | Time Setting | Icon for setting time and date. |
| (2) | Parameter Settings | Icon for setting parameters. A password is required for access. Password = 22 or 022. |
| (3) | Curve Icon | Press the icon to view the temperature curve. |
| (4) | Screen Brightness | Press the icon to adjust the screen brightness. |
| (5) | Error Icon | Press the icon to view the error history. |
| (6) | Electric Heater Icon | Press the icon to manually turn the electric heater on/off, if installed. |
9.0 Time Setting
Press the time setting icon (1) on the previous screen.
On the time setting page, you can choose between setting the time/date, setting times for noise-reduced operation, or setting times for turning the heat pump on/off.
Setting Time and Date:
Follow the on-screen prompts to set the system time and date.
10. Time Setting for Noise-Reduced Operation:
Press the noise-reduced operation icon (mute timer).
| Icon Number | Icon/Button | Icon Color | Function |
|---|---|---|---|
| (1) | Activation of time setting for on/off noise-reduced operation | Active: Blue. Inactive: White | Press the icon to turn the time setting function on/off. |
| (2) | Start time for noise-reduced operation | Select between 0:00-23:59 | |
| End time for noise-reduced operation | Select between 0:00-23:59 | ||
| (3) | Status of start time | On: Blue. Off: Gray | Status of the "start" of the noise-reduced operation function. |
| Status of end time | On: Blue. Off: Gray | Status of the "end" of the noise-reduced operation function. |
11. Time Setting for Heat Pump On/Off:
| Icon Number | Icon/Button | Function |
|---|---|---|
| (1) | Time setting function on/off | Blue: Time setting function is on. White: Time setting function is off. |
| (2) | Week Setting | Setting of days. |
| (3) | Time Period | Heat pump on/off time. |
| (4) | Page 1, 2, 3 | Up to 6 time periods can be selected for the on/off function. |
12. Temperature Curve:
Note:
- The curve displays inlet and outlet temperatures, domestic hot water temperature, and outdoor air temperature.
- Temperature data is saved every 5 minutes. Upon power interruption, the first set of data is saved after 5 minutes; saved data is not deleted.
- Temperature data is only saved when the heat pump is turned on.
- The temperature data points furthest to the right are the most recently saved data.
- The temperature curve is not deleted upon power interruption.
13. Display Brightness Setting:
Note:
- Slide the slider left or right to adjust the display brightness.
- Press the return icon to save and go back to the menu.
- After 5 minutes of inactivity, the display light will turn off. Touching the screen will turn the display light back on.
14.0 Electric Heater
Note: Pressing the electric heater icon manually turns the heater on and it must be manually turned off again.
15.0 Status Page:
Swipe from left to right to view the status page of the heat pump's operation. To return to the home screen, swipe from right to left on the display.
The status page displays information such as Unit State, Present Mode, Coil Temp, Exhaust Temp, Water Flow, and Low Pressure.
16.0 Error Display with Description:
| Icon Number | Description |
|---|---|
| (1) | Error Code |
| (2) | Error Description and Timestamp |
| (3) | Press icon to clear error history |
| (4) | Page Number |
7.0 Error Codes & Troubleshooting
| Problem | Possible Cause | Related Components | Solution |
|---|---|---|---|
| Fuse Tripped | Short circuit | Terminals, Relays, Contactor, Wiring | Check electrical component connections. Check contactors and relays for damage. Disconnect electrical components one by one and reconnect power until the fuse trips, then replace the faulty component. |
| No Power to Display | Wire not connected, Wire connected incorrectly | Display wiring, connection cable | Check display wiring. Check connection cable. Verify that there are 3 different phases in the connection cable. |
| Heat Pump Does Not Start | Error state, Connection wire disconnected | Display, Wiring | Check for errors on the display. Check connection wire. Disconnect power for 1 minute and reconnect. |
| Display is Locked | Unlock with padlock icon on display, Display error | Display | Check if the padlock icon shows locked. Check display wiring. Disconnect power for 1 minute and reconnect. |
| Low Heating Effect | Low compressor frequency, Fan not running or running slowly, Leak in refrigerant circuit | Compressor, Fan, Refrigerant Circuit | Check compressor frequency. Check fan speed. Check outlet temperature. |
| Shuts Off Before Desired Temperature is Reached | Temperature limit (heating curve function is active) | Control logic | Check heating curve parameters. |
| Ice Formation on Evaporator Surface | Fan motor problem, EEV needs calibration, Refrigerant charge, Parameter problem | Parameter, Fan, EEV, Refrigerant Circuit Problem | Check parameters, compressor. Check fan speed. Check outlet temperature and suction pressure in the refrigerant circuit. |
| Abnormal Noise | Loose screws, Fan blade/motor problem, Compressor problem, Vibrating components | Screws, Fan, Compressor, Other components (pipes, cables) | Check for loose screws. Check fan blade/motor. Check compressor. Check other components. |
Error Codes and Troubleshooting:
| Error Code | Error Description | Relevant Components | Troubleshooting |
|---|---|---|---|
| E04 | Electric heater protection | Check the thermostat in the electric heater. Check the electric heater. | |
| E08 | Communication error between PCB and display | Communication error between PCB and DISPLAY | Check cable connection between PCB (board) and DISPLAY. Check software version in PCB and DISPLAY. |
| E11 | High-pressure protection | HP sensor active | Restart the heat pump and check if the error recurs. Measure outlet pressure during operation. Check EEV step, suction pressure, inlet/outlet water temp, suction and outlet temperature. Refill refrigerant according to the data on the nameplate. |
| E12 | Low-pressure protection | LP sensor active | Restart the heat pump and check if the error recurs. Measure outlet pressure during operation. Check EEV step, suction pressure, inlet/outlet water temp, suction and outlet temperature. Refill refrigerant according to the data on the nameplate. |
| E19 | Primary Anti-frost Protection | Ambient temp. 50°C, 2°C ≤ water inlet ≤ 4°C | Winter protection. The error code disappears when the water temperature rises to A04+4°C or the ambient temperature is above 1°C. |
| E29 | Secondary Anti-frost Protection | Ambient temp. 50°C, water inlet ≤ 2°C | Winter protection. The error code disappears when the water temperature rises to A04+11°C or the ambient temperature is above 1°C. |
| E032 | Water flow protection | Flow sensor activated | Check connection. Check flow sensor. Ensure no closed valves are blocking water flow. Check water pump and filter. Ensure the system can be vented effectively. |
| E051 | Compressor overcurrent stop fault | Compressor overcurrent | Check ambient temperature and inlet/outlet temperature. Turn on the unit. Record changes in high and low pressure, outlet/suction temp, EEV steps, compressor frequency, power consumption. If OK, replace the compressor driver board. |
| E065 | High water outlet temperature | Check water flow rate. Too high/low. | |
| E081 | Communication error between PCB and fan driver board | Communication error between PCB and fan driver board | Check connection between PCB and fan board. Ensure 12V-12V, GND-GND, A-A, B-B are connected. If connected, power on the unit, measure voltage between 12V and GND on the fan board. If higher than 15V or lower than 7V, replace the fan board. |
| E103 | Fan motor overload | Check if the fan motor runs normally. Check fan motor current consumption. If current consumption is > 1A, the motor is faulty and needs replacement. If current consumption is < 1A, the fan motor's board/module may be defective and needs replacement. | |
| E171 | Anti-frost protection | Inlet ≤ A04°C and antifrost temp ≤ A04-A05°C | Check water circulation in the water circuit. Check the outlet temperature sensor. Measure the ambient temperature. Check electrical connections. Check defrost parameters; if defrost time is too long or defrost occurs too frequently. |
| F01 | Compressor startup fault | Restart the heat pump. Check EEV position changes, high pressure, low pressure, inlet/outlet water temperature. Check U/V/W connections between compressor and compressor driver board. Check compressor windings. Check compressor driver board. | |
| F03 | PFC fault | Restart the unit. 1. Check power supply and connections. Is the power supply stable? 2. Replace compressor driver board. | |
| F05 | DC Bus voltage too high | 1. Check voltage between DCP-IN and DCN-IN. If lower than 300V, F05 message will appear. 2. Check voltage on R/S/T on the compressor driver board. If lower than 210V, F05 message will appear. 3. If OK, replace compressor driver board. | |
| F06 | DC Bus voltage too low | Check voltage between DCP-IN and DCN-IN. If lower than 300V, F06 message will appear. Check voltage on R/S/T on the compressor driver board. If lower than 210V, F06 message will appear. If OK, replace compressor driver board. | |
| F07 | AC Input voltage too low | Measure voltage on R/S/T on the driver board. If lower than 300V, F07 message will appear. If OK, replace compressor driver board. | |
| F08 | AC current consumption too high | Only on 1-phase models. Restart the unit. Check for transition; if not, replace the drive board. | |
| F09 | Input voltage sampling fault | Measure if voltage is lower than 300V or higher than 500V. If OK, replace compressor driver board. | |
| F10 | Communication error between DSP and PFC | Only on 1-phase models. Check inverter board connections. If OK, replace compressor driver board. | |
| F11 | Communication error between DSP and communication board | Check inverter board connections. If OK, replace compressor driver board. | |
| F12 | Communication error between PCB and driver board | Check connection between main control board and compressor driver board. Ensure 12V-12V, GND-GND, A-A, B-B are connected. If connected, power off the unit, measure voltage between 12V and GND on the compressor driver board. If higher than 15V or lower than 7V, replace the compressor driver board. | |
| F13 | IPM Overheat Stop | Check if fans are running. Check if airflow in the evaporator is OK. Ensure the heat pump is not placed too close to a wall or other obstruction that could impede airflow. Clean the evaporator surface. If OK, replace the compressor driver board. | |
| F15 | Phase lacking input voltage | Check R/S/T phases to the compressor driver board. If OK, replace the compressor driver board. | |
| F16 | Compressor weak magnetic protection alarm | Check the refrigerant circuit for leaks. If OK, replace the compressor driver board. | |
| F17 | Driver board temperature fault | Check connection to the heat sink temp. sensor. Check resistance in the heat sink temp. sensor. If OK, replace the heat sink and heat sink temp. sensor. | |
| F18 | IPM current curve fault | Check ambient temperature and inlet/outlet water temperature. Check high/low pressure and outlet/suction temp. Check EEV step. Check compressor frequency and power consumption. If OK, replace the compressor driver board. | |
| F20 | IGBT Power unit overheating alarm | Check if fans are running. Check if distance to wall or other obstructions is adequate according to installation manual. If OK, replace the compressor driver board. Ensure good airflow in the evaporator. Clean the evaporator surface. | |
| F22 | AC input overcurrent protection alarm | Only 1-phase models. Restart the heat pump. Check for fault current/leakage. If the fault persists, replace the drive board. | |
| F23 | EEPROM fault alarm | Check connections. Replace drive board. | |
| F24 | Damaged EEPROM alarm | ||
| F25 | LP 15V low load fault | Check if the power supply is stable and restart the unit. If the fault persists, replace the drive board. | |
| F26 | IGBT Power unit overheating fault | Check if the fan is running. Check if the air intake to the evaporator is blocked, or if it is placed too close to a wall or similar. Ensure adequate airflow through the evaporator. Clean the heat exchanger. If OK, replace the drive board. | |
| F031 | DC Fan motor 1 fault | ||
| F032 | DC Fan motor 2 fault | Turn off power to the heat pump and check electrical connections. Restart the heat pump and check if the motor runs normally, or if the error message reappears. Replace the fan motor. | |
| Pp1 | Outlet pressure sensor fault | Check connection to the outlet pressure sensor. If connection is OK, replace the outlet pressure sensor. | |
| Pp2 | Suction pressure sensor fault | Check connection to the suction pressure sensor. If connection is OK, replace the suction pressure sensor. | |
| TP | Low ambient temperature protection | Ambient temp ≤ -30°C | 1. Check ambient temperature. 2. When ambient temp ≥ -28°C, the error message is removed. |
| P01 | Inlet temp. sensor fault | Check electrical connection. Measure sensor resistance; if lower than 100Ω or higher than 500kΩ, replace the sensor. | |
| P02 | Outlet temp. sensor fault | ||
| P04 | Ambient temp. sensor fault | ||
| P17 | Outlet temp. sensor fault | ||
| P032 | Domestic hot water temp. sensor fault | ||
| P42 | Room temp. sensor fault | ||
| P101 | EVI Inlet temp. sensor fault | ||
| P102 | EVI outlet temp. sensor fault | ||
| P153 | Coil temp. sensor fault | ||
| P181 | Outlet temp. sensor fault | ||
| P182 | Outlet temperature too high | (Outlet Temp.) ≥ C05 (factory setting = 110°C) | 1. Measure sensor resistance; if lower than 100Ω or higher than 500kΩ, replace the sensor. 2. Check for leaks in the refrigerant circuit. |
| P191 | Antifrost temp. sensor fault | Check electrical connection. Measure sensor resistance; if lower than 100Ω or higher than 500kΩ, replace the sensor. |
