STIEBEL ELTRON LWZ 180/280 Operation and Installation

Product Overview

The STIEBEL ELTRON LWZ 180 and LWZ 280 are central ventilation appliances designed for domestic use, providing mechanical ventilation with central supply and extract air routing. These units feature heat recovery, utilizing a cross-countercurrent heat exchanger to transfer thermal energy from the extract air to the supply air, thereby recovering a significant portion of thermal energy. The 'Enthalpie' models incorporate an enthalpy heat exchanger that also transfers moisture, helping to maintain optimal humidity levels in the rooms.

The appliances are intended for use in residential buildings and can also be used in non-domestic environments. Operation is designed to be user-friendly, with clear instructions for appliance users and qualified contractors.

Safety Instructions

General Safety: Only qualified contractors should perform installation, commissioning, maintenance, and repair. Use only original accessories and spare parts.

Electrical Safety: Disconnect the power supply before any internal work. Do not reach into the appliance interior through the 'Outdoor air' connection when the power is on.

Fire Prevention: Observe all country-specific regulations and requirements concerning ventilation systems and fire prevention.

Combustion Equipment: When operating with combustion equipment, be aware of potential negative pressure generation that could lead to exhaust gases entering the dwelling. Ensure proper planning and measures for simultaneous operation.

Symbols: The manual uses symbols to indicate the type of risk (DANGER, WARNING, CAUTION) and other important information (Note).

Appliance Description

The appliance draws in outdoor air and extracts stale air from rooms with odors or moisture. Both air streams are filtered separately before passing through the heat exchanger. The air flow rate is preset by a qualified contractor, ensuring constant flow rate control regardless of duct pressure.

Key Features:

• Heat recovery via cross-countercurrent heat exchanger.
• Enthalpy heat exchanger (Enthalpie models) for moisture transfer.
• Frost protection controller to prevent freezing.
• Bypass damper for utilizing cool outdoor air in summer or warm outdoor air in spring/autumn.

Operation and Settings

The appliance can be operated using the integrated programming unit or an external programming unit. Key settings include:

• Switching On/Off: Plug into a standard socket.
• Programming Unit: Access menus for settings like humidity protection, fan stages (Stage 1, Stage 2, Intensive ventilation), time programs, and favorites.
• Display Symbols: Various symbols indicate the operating mode, filter status, faults, bypass mode, and frost protection.
• Parameters: Settings can be adjusted via direct selection or through menu navigation. These include room temperature, ventilation times, fan control (constant flow rate/constant pressure), air flow rates, humidity control, frost protection, and bypass settings.
• Time Programs: Users can set specific switching time pairs for different days of the week to control fan stages.

Installation

Installation must be performed by a qualified contractor. Key aspects include:

• Preparation: Ensure proper storage, select an appropriate installation site free from dust and frost, and check wall load-bearing capacity.
• Minimum Clearances: Observe specified clearances around the unit for proper ventilation and maintenance.
• Air Ducts: Connect air ducts (DN 160 or DN 180) using appropriate fittings and sealing tape. Ensure no metal swarf enters the ducts. Insulate ducts to prevent condensation.
• Condensate Drain: Lay the condensate drain hose without kinks, with a minimum fall of 10%. Ensure the drain is airtight and free from frost.
• Electrical Connection: Connect the appliance to a standard socket. Ensure all electrical work complies with national and regional regulations.
• Commissioning: Verify that combustion exhaust gases are not penetrating the dwelling. Ensure proper function of safety equipment.

Maintenance, Cleaning, and Care

User maintenance is primarily limited to filter inspection and replacement.

• Filter Replacement: Inspect filters every three months and replace them when the filter change warning signal appears or at least every 12 months. Ensure filters are fitted correctly.
• Cleaning: Use a damp cloth for cleaning plastic parts. Avoid abrasive or corrosive cleaning agents.
• Heat Exchanger and Fans: Qualified contractors should clean the heat exchanger and fans periodically (e.g., every 3 years).

Troubleshooting

The appliance stores fault messages in a notification list. If a fault cannot be resolved, contact a qualified contractor. Provide the serial number from the type plate when making an inquiry.

Common issues and remedies are detailed in the troubleshooting section, covering sensor faults, fan issues, condensate drain problems, and communication errors.

Disposal

Disconnect the appliance from the power supply before disassembly. Use appropriate tools and follow national regulations for material separation and disposal.

Specifications

Detailed specifications include dimensions, electrical data, sound emissions, filter classes, and connection details. Fan diagrams illustrate pressure drop for various air distribution systems.

Guarantee and Environment

Guarantee conditions vary by country and subsidiary. Information on environmental protection and recycling is provided, emphasizing proper disposal of materials according to national regulations.