Atlantic Mileo Inox+300

Need help?

Do you have a question about the Atlantic Mileo Inox+300 and is the answer not in the manual?

Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The Mileo Inox + 300 is a high-efficiency indirect storage water heater designed for floor installation and connection to an external heat generator. It features a built-in stainless steel coil that heats the domestic hot water (DHW) contained within the stainless steel DHW tank. While the coil is optimized for use with a heat pump, it can also be operated with other heat sources such as a boiler or a pellet stove. For additional heating, an optional electric heating element can be installed in the DHW tank.

Function Description:

The water heater is designed to efficiently heat and store domestic hot water. The primary circuit, connected to an external heat generator (e.g., heat pump, boiler), circulates hot fluid through the stainless steel coil, transferring heat to the domestic water in the tank. The optional electric heating element provides supplementary heating, ensuring hot water availability even when the primary heat source is not active or when higher temperatures are desired. The appliance is equipped with a drywell for a DHW temperature sensor, allowing for precise temperature control. A thermometer is also integrated to monitor the internal temperature.

Important Technical Specifications:

Total Capacity: 297 L
DHW Circuit Capacity: 275 L
Coil Capacity (Primary Circuit): 22 L
Primary Pressure Drop: 48.5 mbar
Coil Heating Surface: 3.6 m²
Max. Design Pressure (Primary): 5 bar
Max. Design Pressure (DHW): 8 bar
Reheat Performance - Primary Heating Power Input: 106 kW
Primary Flow Rate (to achieve Reheat Performance): 0.25 L/s
Reheat Time (heating source = internal coil): 20 min
Equivalent Capacity at 40°C: 439 L
Standing Heat Loss: 2.12 kWh/24h (83 W)
Empty Weight: 75 kg
Dimensions: Diameter Ø 565 mm, Height 1935 mm. Clearances are required for installation and removal of the optional heating element.
Connections:
- Heat generator (Primary): Ø 5/4" (Female)
- Domestic cold / hot water: Ø 3/4" (Male)
- Auxiliary DHW: Ø 3/4" (Male)
- Optional heating element: Ø 6/4" (Female)
- Drywell for temp. sensor: Ø 1/2" (Female)
Electrical Characteristics (with opt. heating element):
- Rated Voltage: 230 V~
- Rated Frequency: 50 Hz
- Optional Heating Element Power: 0.75 kW (3.25 A), 1.5 kW (6.5 A), or 3 kW (13 A) for 230V.

Usage Features:

Installation: The appliance must be installed in a dry, frost-protected location (min. 4 to 5°C ambient temperature) and be easily accessible for maintenance. It must be installed by a qualified technician in accordance with local standards and regulations.
Water Quality: The system requires water from the distribution network with specific parameters: Chlorides < 150 mg/L, pH between 6 and 8, and hardness between 9°fH and 20°fH. The use of a water softener is recommended.
Safety: Hot water can cause burns. A pre-set thermostatic mixing valve is recommended to provide hot water at a maximum of 60°C. Children, elderly, disabled, or handicapped individuals should never be left unsupervised in baths or showers to prevent exposure to excessively hot water.
Legionella Prevention: A minimum temperature of 60°C must be maintained in both the DHW tank and the hot water distribution network. If this temperature is not consistently maintained, a 60°C heating cycle should be performed at least once a week.
Electrical Safety: Electrical connections and optional heating element installation must be carried out by an approved installer. The appliance must be earthed, and a 2-way switch and fuse or circuit breaker of the recommended rating should be installed outside the appliance for power shutdown during servicing.
Filling: The DHW tank and primary circuit must be filled with clear water, and air must be bled from both circuits. A safety group (stop valve, check valve, 7-bar safety valve, and appropriately sized expansion vessel) is mandatory for the DHW circuit. For the primary circuit, a safety valve and expansion vessel are imperative between the tank and stop valves when they are closed.

Maintenance Features:

Periodic Checks by User:
- Regularly check the pressure gauge of the primary circuit (refer to the heat generator manual for correct pressure).
- Visually inspect valves, connections, and accessories for leaks or malfunctions.
- Regularly check that the safety valve on the cold water side of the water heater is not leaking.
- Contact an installer for any problems.
Annual Maintenance (by Installer):
- Check for leaks and repair if any.
- Verify the correct operation of expansion vessels in both primary and DHW circuits.
- Check primary and DHW circuit pressure (if pressure gauges are installed).
- Manually activate the water heater safety valve once a year (this will discharge hot water).
- Check the correct operation of all installed valves, taps, control units, and accessories (refer to manufacturer's instructions).
Draining:
- DHW Tank: To drain, open a hot water tap for at least 60 minutes to cool the tank, close the filling and stop valves, connect a flexible hose to the drain valve, open the drain valve, and open a higher hot water tap to accelerate drainage.
- Primary Circuit: Stop the charging pump, isolate the primary circuit by closing stop valves, connect a flexible hose to the drain valve, open the drain valve to drain the water, and close the drain valve after draining.
- Drainage is necessary if the appliance is out of service in winter or at risk of freezing. If the primary circuit contains antifreeze, only the DHW tank needs to be drained. If not, both circuits must be drained.
Bringing Back into Service: After maintenance, refer to the "Starting Up" chapter for instructions on how to bring the appliance back into service.
Troubleshooting: The manual provides a troubleshooting guide for common issues such as cold, lukewarm, or excessively hot water, outlining potential causes (e.g., wrong thermostat setup, power supply issues, defective heating element) and recommended actions.