This document is an operation manual for the Daikin EKHBRD011AAV1, EKHBRD014AAV1, EKHBRD016AAV1, EKHBRD011AAY1, EKHBRD014AAY1, and EKHBRD016AAY1 indoor units, which are part of an air-to-water heat pump system and its options. The manual provides detailed instructions on how to operate, maintain, and troubleshoot the unit.
Function Description
The Daikin EKHBRD indoor unit is designed for floor-standing indoor installation and is primarily used for heating applications. It functions as the indoor component of an air-to-water ERSQ or ERRQ heat pump system. The unit can be integrated with space heating radiators (field supply) and an optional EKHTS domestic hot water tank. A remote controller with room thermostat functionality is standard supplied to control the installation.
The unit supports various operation modes for space heating and domestic water heating, including:
- Space Heating Operation: Can be controlled based on room temperature or leaving water temperature.
- Domestic Water Heating Operation: Offers automatic storage (daily heat-up), manual storage (one-time heat-up), reheat (continuous minimum temperature maintenance), and disinfection operations.
- Schedule Timer Operation: Allows users to program specific actions for space heating, domestic water heating, and quiet mode at scheduled times.
- Quiet Mode Operation: Reduces compressor speed to lower noise levels, which may extend the time required to reach the desired temperature set point.
- Defrost Operation: Automatically activates to prevent freezing of the outdoor heat exchanger in low outdoor temperatures.
- Emergency Operation: In this mode, heating is exclusively done by the heater kit, bypassing the heat pump.
Important Technical Specifications
The manual refers to a "Field settings table" (pages 16-18) which lists various parameters and their default values, ranges, and units. Key specifications include:
- Temperature Ranges:
- Room temperature for heating: 16°C to 32°C.
- Leaving water temperature for heating: 25°C to 80°C.
- Weather-dependent set point: Low ambient temperature (Lo_A) from -20°C to 5°C, High ambient temperature (Hi_A) from 10°C to 20°C.
- Disinfection operation temperature: 60°C to 75°C.
- Hot water storage temperature: 45°C to 75°C.
- Reheat minimum water temperature: 35°C to 65°C.
- Reheat maximum water temperature: 35°C to 75°C.
- Leaving water maximum temperature: 37°C to 80°C.
- Leaving water minimum temperature: 25°C to 37°C.
- Time Settings:
- Night time storage start time: 0:00 to 23:00 (1-hour step).
- Day time storage start time: 0:00 to 23:00 (1-hour step).
- Setback operation start/stop time: 0:00 to 23:00 (1-hour step).
- Disinfection operation start time: 0:00 to 23:00 (1-hour step).
- Disinfection operation time duration: 5 to 60 minutes (5-minute step).
- Minimum time for domestic water heating: 5 to 20 (1-unit step).
- Maximum time for domestic water heating: 10 to 60 (5-unit step).
- Interval minimum stop time of domestic water heating: 5 to 30 (5-unit step).
- Refrigerant: R134a, with a GWP (Global Warming Potential) value of 1300.
Usage Features
- Remote Controller: The unit is operated via a remote controller with a room thermostat function. It provides full control over heating applications, varying in capacity, electrical supply, and installed equipment.
- Clock and Day Setting: Users can manually set the clock and day of the week, which is essential for the schedule timer to function correctly. A power failure exceeding 1 hour will reset these settings.
- Space Heating Control:
- Room Temperature Control: Heating activates based on a user-defined room temperature set point, which can be set manually or via the schedule timer. This mode prioritizes room temperature control over leaving water control.
- Leaving Water Temperature Control: Heating activates based on a water temperature set point, which can be set manually, through the schedule timer, or automatically via weather-dependent operation.
- Automatic Setback Function: Lowers the room temperature during specific periods (e.g., at night) to optimize energy consumption.
- Weather Dependent Set Point Operation: Automatically adjusts the leaving water temperature based on outdoor temperature, leading to lower power consumption. Users can shift the target water temperature by a maximum of ±5°C.
- Domestic Water Heating Control:
- Automatic Storage: Heats water to a set point during the night (when space heating requirements are lower) and/or during the day, based on a daily fixed pattern.
- Manual Storage: Allows immediate, one-time heating of water to a set point.
- Reheat Function: Maintains the domestic hot water tank temperature above a minimum value.
- Disinfection Operation: Periodically heats the domestic water to a specific temperature to disinfect the tank.
- Schedule Timer: Enables programming of up to five actions per day for space heating, domestic water heating, and quiet mode. Actions can be based on temperature set points or ON/OFF instructions.
- Temperature Read-out Mode: Allows users to view actual temperatures, including leaving water, entering water, indoor, outdoor, and hot water supply tank temperatures.
- Field Settings: Advanced configuration of the Daikin system parameters is done through field settings, accessible via the user interface.
Maintenance Features
- Regular Checks: To ensure optimal availability, yearly checks and inspections of the unit and field wiring should be carried out by a local Daikin technician.
- Operator Maintenance:
- Keep the remote controller clean with a soft damp cloth.
- Check if the water pressure indicated on the manometer is above 1 bar.
- Power Supply: It is crucial NOT to switch off the power supply to the unit during longer periods of standstill (e.g., summer for heating-only applications) to prevent the pump from getting jammed due to repetitive movement.
- Refrigerant Leak Inspections: Periodical inspections for refrigerant leaks may be required based on European or local legislation. Users should contact their local dealer for more information.
- Troubleshooting Guidelines: The manual provides a troubleshooting section to help users solve common problems, such as no readings on the remote controller, error codes, incorrect schedule timer execution, or capacity shortage. For complex issues, users are advised to consult their installer or local dealer.
- Disposal Requirements: Dismantling, treatment of refrigerant, oil, and other parts must be done by a qualified installer in accordance with relevant local and national legislation. The unit should be treated at a specialized treatment facility for re-use, recycling, and recovery.
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