This document provides assembly instructions and safety information for the Lacunza Silver 800 and Silver 1000 Inbuilt Zero Clearance Box. This device is an accessory designed to house and support Lacunza Silver 800 and Silver 1000 wood-burning heaters, allowing for their safe installation within combustible enclosures with specified clearances. It acts as a protective barrier, ensuring that the heat generated by the appliance does not come into direct contact with combustible materials, thereby preventing fire hazards.
Function Description:
The Zero Clearance Box serves as a crucial component for installing Lacunza Silver 800 and Silver 1000 heaters in a manner that complies with safety standards AS/NZS 4013:2014 and AS/NZS 2918. Its primary function is to create a safe, non-combustible enclosure around the heater and its flue system. This allows the heater to be installed closer to combustible walls and ceilings than would otherwise be permissible for a standard freestanding appliance. The box includes a stand for elevation, side and back panels for enclosure, and a top panel with provisions for flue installation. It also incorporates specific design elements to manage airflow and heat dissipation, such as vents and flue brackets, to maintain safe operating temperatures for surrounding structures. The design accommodates both Silver 800 and Silver 1000 models, with a conversion step provided for the Silver 800 to ensure proper fit and function.
Important Technical Specifications:
The manual outlines several critical technical specifications related to clearances and material requirements for the installation of the Zero Clearance Box and the heater within a combustible enclosure:
- Venting in Ceiling Enclosure: A minimum of 335,405mm² of venting is required in the ceiling of the enclosure around the outer triple flue skin, evenly spaced around the outer casing. This ensures adequate heat dissipation from the flue system.
- Timber Framing Clearance: Timber framing in the ceiling cavity must be a minimum of 1230mm above the zero box. This clearance is essential to prevent overheating of combustible structural elements and must not restrict the 335,405mm² airflow around the flue casing.
- Outer Flue Casing Height: The outer galvanised casing of the flue (300mm) must be raised 65mm above the zero clearance box. This specific height is critical for proper flue operation and heat management.
- Inner Flue Casing Venting: The inner galvanised casing of the flue (250mm) must be vented into the zero clearance box outer skin and sealed to prevent venting into the enclosure. This design detail ensures that hot air is directed appropriately and does not escape into the surrounding combustible structure.
- Combustible Enclosure Vents: The combustible enclosure must feature two vents, each with a minimum area of 9,820mm². The bottom vent must be positioned 50mm above the floor, and the top vent 500mm below the ceiling. These vents must be installed on the front of the combustible enclosure and constructed from heat-resistant material. These vents are crucial for allowing convection currents to cool the enclosure.
- Underside Mantle Shelf Clearance: The underside of any mantle shelf must be no closer than 550mm from the top of the appliance hot air outlet and extend no further than 250mm into the room. This prevents the mantle shelf from becoming excessively hot.
- Underside Mantle Key Clearance: The underside of any mantle key must be no closer than 500mm from the top of the appliance hot air outlet and extend no further than 25mm into the room.
- Mantle Upright Clearances: Mantle uprights must be no closer than 150mm from the side of the appliance and should be no thicker than 40mm.
- Front Wall Material and Extension: The front wall of the enclosure, to a height of 400mm above the appliance, must be made of non-combustible material. This non-combustible section must extend 250mm either side of the appliance down to the floor protector.
- Internal Wall Noggin: The first internal wall noggin above the zero clearance box must be made of non-combustible material.
- Rear/Rear Wall Combustible Material Clearance: Combustible material to the rear/rear wall of the enclosure must be a minimum of 100mm from the rear of the appliance zero clearance box.
- Side/Side Wall Combustible Material Clearance: Combustible material to the side/side wall of the enclosure must be a minimum of 100mm from the side of the appliance zero clearance box.
- Hearth Thickness: The hearth must have a minimum thickness of 6mm.
- Weight Capacity: The floor must be able to support the combined weight of the heater, flue, and fuel load, which is approximately 300kg.
Usage Features:
The Zero Clearance Box is designed for straightforward assembly and integration with Lacunza Silver 800 and Silver 1000 heaters.
- Modular Assembly: The box is assembled from individual panels (top, bottom, back, sides) and brackets (stand vertical, stand horizontal long, stand horizontal short, bottom, back, flue). This modular design facilitates easier handling and construction.
- Stand Integration: The assembly begins with the construction of a robust stand, which provides the necessary elevation and support for the entire unit. The stand can be secured to the floor using fixings appropriate for the flooring structure, ensuring stability.
- Flue Brackets: Dedicated flue brackets are used to correctly position and support the 200mm (inner) and 300mm (outer) flues, ensuring proper alignment and clearance.
- Model Adaptability: The design includes a conversion step for the Silver 800 model, involving the assembly of two Side Fill-Ins. This ensures that the Zero Clearance Box can be adapted to fit either the Silver 800 or Silver 1000 heater, providing versatility.
- Clearance Diagrams: Detailed diagrams are provided for both Silver 800 and Silver 1000 models, illustrating the required clearances for combustible materials around the installed unit. These visual aids are crucial for ensuring correct and safe installation.
- Self-Tapping Screws: The assembly primarily uses self-tapping screws, simplifying the fastening process. Instructions emphasize not fully tightening screws until the top panel is in position, allowing for adjustments during assembly.
Maintenance Features:
While the manual primarily focuses on assembly and installation, certain aspects imply maintenance considerations:
- Durable Construction: The use of galvanised steel for flue casings and presumably other components of the Zero Clearance Box suggests a durable construction, designed to withstand the high temperatures and demands of a wood-burning appliance.
- Sealing Requirements: The instruction to seal the 200mm flue with a flexible sealant around the top of the Zero Clearance Box highlights a critical maintenance point. Regular inspection of this seal would be necessary to ensure it remains intact and prevents heater air from entering the chimney chase cavity.
- Ventilation Integrity: The specified vent sizes and locations in the combustible enclosure are vital for proper airflow and cooling. Periodic checks to ensure these vents are clear of obstructions and damage would be part of routine maintenance for the overall installation.
- Accessibility for Heater Maintenance: Although not explicitly stated as a maintenance feature of the Zero Clearance Box itself, the design implicitly allows for access to the heater for its own maintenance, as the box forms a fixed enclosure around it. The heater's own manual would detail its specific maintenance requirements.
- Structural Integrity: The emphasis on securing the stand to the floor and the overall robust assembly using multiple screws suggests a design intended for long-term structural integrity. Regular visual inspections of the box's components for any signs of wear, corrosion, or loosening of fasteners would contribute to the longevity and safety of the installation.
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