Duratech DuraPro Heat Pump Manual

2.1 Performance Data

Detailed performance data for DURAPRO-12, DURAPRO-17, DURAPRO-21, DURAPRO-25S, and DURAPRO-28TS models under various air and water temperature conditions.

* Advised pool volume for an entirely insulated pool, with cover, free from wind and exposed to the sun. In case the pool volume is close to the maximum value, the inverter heatpump will nearly always run at full power. ** Advised pool volume for efficient heating.

2.2 Dimensions

Diagram illustrating the dimensions of the DURAPRO-12/17/21/25S/28TS heat pumps. The diagram shows numbered points (1-6) corresponding to dimensions, water inlet, and water outlet. A table provides specific measurements in millimeters for each model.

* All dimensions in mm

Diagram showing recommended clearance for air inlet and outlet: 700mm clearance for air inlet, 500mm for air outlet, 2500mm horizontal clearance, 300mm vertical clearance.

3.1 Heat Pump Location

The unit performs best outdoors with adequate fresh air, electricity, and pool filter piping. Avoid enclosed areas with limited air volume where discharge air can recirculate. Do not place the unit near shrubs that block air inlets, as this reduces efficiency.

3.2 How Close To Your Pool?

Install the heat pump within 7.5 meters of the pool. Longer distances increase heat loss from piping. Burying pipes minimizes loss up to 15 meters (30 meters total run). Heat loss is approximately 0.6 kW-hour per 30 meters for every 5°C temperature difference between pool water and surrounding ground, increasing run time by 3-5%.

3.3 Installation illustration

Diagram shows a typical pool system setup including the heat pump, bypass valve, sand filter, water pump, chlorinator cell, and water inlet/outlet. Remarks: The factory supplies the heat pump; other parts like bypass are user/installer provided. Attention points: Add chemicals downstream of the heat pump, install a bypass for maintenance, place the unit on a solid base with silent blocks, and keep the unit upright (wait 24 hours if tilted before operation).

3.4 Installation of a check valve

When using automatic chlorine/pH systems, install a check valve downstream of the heat pump to prevent backflow of concentrated chemicals that could corrode the heat exchanger. Failure to do so may invalidate the warranty.

3.5 Electrical Wiring

Important: The heat pump is electrically isolated from the pool water, but grounding is required for protection against short circuits. Ensure the electrical mains voltage matches the heat pump's operating voltage. Use a separate C-curve fuse and adequate wiring as per the table below. Connect wires to the 'TO POWER SUPPLY' terminal block. A second block, 'TO PUMP', can connect to the filter pump (max. 5A/240V) or a relay to control filter pump operation.

3.6 Initial Start-up of the Unit

Note: The filter pump must be running for the heat pump to operate.

Start-up Procedure:

1. Turn on the filter pump. Check for water leaks and flow.
2. Turn on electrical power to the heat pump and press the ON/OFF button on the wire controller.
3. After a few minutes, confirm the air leaving the unit is cooler (5-10°C).
4. Turn off the filter pump; the heat pump should shut off automatically.
5. Allow the unit and pool pump to run 24 hours/day until the desired temperature is reached. The unit will shut off automatically at the set temperature and restart when the temperature drops by more than 2°C.

Time Delay: A 3-minute built-in restart delay protects components and prevents rapid cycling. This delay activates after any control circuit interruption, including brief power outages. Power interruptions during the countdown do not affect the 3-minute duration.

3.7 Condensation

Water may condense on the evaporator fins as the heat pump cools the air by approximately 5°C. This condensation drains through a barbed fitting on the base pan, which accepts 20mm vinyl tubing to a suitable drain. It can be mistaken for a leak. TIP: To verify condensation, shut off the unit while the pool pump runs; if water stops draining, it's condensation. Alternatively, test drain water for chlorine; absence indicates condensation. Do not use unauthorized defrosting or cleaning methods. Store the appliance in a room without continuous ignition sources. Do not pierce or burn the unit. Refrigerants are typically odorless.

4.1 Display interface introduction

1. Main interface: Displays date, time, temperature (current pool temperature and possibly ambient/water temperature), and status icons. The interface is numbered 1 through 9 for various elements.

2. Button description:

4.2 Button functions

1. ON/OFF: Turns the heat pump ON or OFF (stand-by).

2. LOCK SCREEN: Press to lock the screen. To unlock, press the lock button and enter code "22".

3. PARAMETERS: N/A (Not applicable in this context).

4. CLOCK SETTINGS: Tap button 3 on the main interface. The display shows the current date and time. Tap button 1 (Time Settings) to adjust the time, then tap Enter to save. Tap button 2 (TIMER set) to access timer menus for setting start and end times for the unit's operation.

• Timer START: Activate/deactivate the start timer (Green/Grey icon).
• Start time: Set the desired start time.
• Timer END: Activate/deactivate the end timer (Red/Grey icon).
• End time: Set the desired end time.

5. ERROR CODES: Refer to section 4.3.

6. SILENT SETTINGS: Tap the silent settings button on the main screen. A pop-up appears with two icons:

• Direct silent mode: Tap button 1 to enter silent mode directly. A fan icon with 3 blades indicates active silent mode. Tap again to exit.
• Timed silent mode: Tap button 2. This menu allows setting start and end times for silent mode. For example, setting ON to use timed silent mode will start it at 23:00h and end at 08:00h. If the unit is in silent mode and OFF button (1) is tapped, silent mode exits immediately.

7. MODE: Tap the Mode button on the main screen. A menu appears with options:

1. Cooling mode
2. Automatic heating/cooling mode
3. Heating mode
4. Set desired swimming pool temperature

8. STATISTICS: Tap the Statistics button. A menu displays temperature curves (inlet/outlet water, average power input) that update hourly and can be stored for 60 days.

9. WATER TEMPERATURE: Set the desired swimming pool water temperature.

4.3 Error codes

Access error codes by tapping the Error codes button on the main screen. The display shows Fault code, Fault name, and Fault time. If no errors are present, a grey triangle logo appears. When an error occurs, an icon flashes orange/grey, and the system records the time, code, and name. If not checked, a static icon appears. The Error code history menu shows codes in reverse order, with the most recent first. The 'Clean' key erases codes.

4.4 Error code list

A table lists various protect/fault codes, their display names, reasons, and elimination methods. Examples include sensor failures (inlet, outlet, coil, ambient, suction, exhaust), pressure protections (high/low), flow failures, anti-freezing protections, low temperature protection, compressor overload, and communication failure.

5.1 Wire control interface diagram and definition

Diagram showing the wire control interface terminals (V, R, T, A, B, G) and their functions (12V power, Not used, 485A, 485B, GND).

5.2 Controller interface diagram and definition

Detailed diagrams of the controller interface for DURAPRO-12, DURAPRO-17/21, and DURAPRO-25S/28TS models. These diagrams show terminal connections and component labels such as AT (Ambient temperature), COMP (Compressor), EEV (Electronic expansion valve), FM (Fan motor), HP (High pressure protection), LP (Low pressure protection), OT (Outlet water temperature), SUT (Suction temperature), etc. A legend defines these abbreviations.

7.1 Caution & Warning

• Repairs must be performed by qualified personnel or authorized dealers (Europe market).
• The appliance is not intended for use by persons with reduced physical/sensory capabilities unless supervised. Children should be supervised to ensure they do not play with the appliance.
• Ensure proper earthing of the unit and power connection to prevent electrical shock.
• If the supply cord is damaged, it must be replaced by the manufacturer, service agent, or qualified person.
• Do not install near flammable gas sources.
• Ensure a circuit breaker is installed for the unit to prevent electrical shock or fire.
• The heat pump has an over-load protection system with a minimum 3-minute restart delay.
• Repairs must be performed by qualified personnel or authorized dealers (North America market).
• Installation must comply with NEC/CEC by authorized personnel (North America market).
• Use supply wires suitable for 75°C.
• Caution: Single wall heat exchanger is not suitable for potable water connection.

7.2 Supply cable specifications

Tables detailing recommended supply cable specifications (phase line, earth line, MCB, RCD, signal line) based on the nameplate maximum current for both single-phase and three-phase units.

7.3 Warranty

LIMITED WARRANTY: Duratech warrants all parts against manufacturing defects for THREE years from the retail purchase date. This warranty is non-transferable and does not apply to units moved from their original installation sites. Liability is limited to repair or replacement of defective parts; labor and transportation costs are not covered. The warranty does not cover failures due to improper installation, operation, maintenance, unauthorized parts, abuse, accidents, chemical contamination, or operating outside specified parameters.

LIMITATION OF LIABILITY: Duratech disclaims all other warranties, expressed or implied, including warranties of fitness for a particular purpose and merchantability. Duratech expressly excludes liability for consequential, incidental, indirect, or punitive damages.

WARRANTY CLAIMS: Contact your dealer with proof of purchase, model number, serial number, and installation date. All returned parts require a Return Material Authorization number.

7.4 Comparison table of refrigerant saturation temperature

A table showing saturation temperatures for refrigerants R410A and R32 at various pressures (in MPa and °C).