Kospel WZ-80 - User Manual

This document provides operating and installation instructions for a range of KOSPEL domestic hot water cylinders. These devices are designed for heating and storing water, making them suitable for use with low-temperature heating boilers in residential buildings, municipal dwellings, and sanitary rooms. The cylinders are specifically designed for horizontal installation.

Function Description

The KOSPEL domestic hot water cylinder serves as a crucial component in a hot water system, ensuring a readily available supply of heated water. The core of the device is a vitreous enamel-coated steel tank, which provides durability and corrosion resistance. Different models within the range offer varying configurations to suit diverse heating requirements:

• WZ Cylinder: This model is equipped with pipe connectors for external connections, allowing it to integrate with external heat sources such as the coil of a solid fuel cooker.
• WW Cylinder: Featuring a built-in heating coil, this cylinder heats water indirectly through a central heating boiler.
• WB Cylinder: This variant combines the features of the WW and WZ models, including both a heating coil and additional connectors for external heat sources like a solid fuel cooker.
• WP Cylinder: This model utilizes a water jacket, where domestic water is heated indirectly by circulating water within the external jacket.

All models are designed to accommodate an optional immersion heater with a temperature controller, which can be installed in place of a specific plug (1½'' [16] as shown in fig. 2 abcd). This allows for supplementary or alternative heating methods.

Usage Features

The installation and operation of the KOSPEL domestic hot water cylinder require adherence to specific guidelines to ensure product reliability and longevity. The device must be installed and started up by an authorized serviceman. Crucially, the cylinder should not be installed in locations exposed to frost, as this can compromise its functionality and integrity.

For double-jacketed cylinders (like the WP model), installation must be on an open-vented central heating system, with the maximum jacket pressure not exceeding 0.15 MPa. Similarly, domestic hot water cylinders heated directly by the coil of a solid fuel cooker must also be installed in an open-vented central heating system and protected against excessive pressure by an expansion vessel and fittings, in accordance with relevant legal regulations. Solid fuel boilers, when used with these cylinders, must also be installed in an open-vented system protected by binding law regulations.

Connection to the central heating system is made via pipe unions (1½''), with cut-off valves installed before these unions. To achieve the desired efficiency, an appropriate domestic hot water flow rate must be ensured, particularly in forced circulation installations (those with a water pump). For gravity circulation installations, the device needs to be placed to achieve a significant height difference (at least 1.5m) between the heat source and the cylinder.

Connecting to the water supply system requires compliance with binding law regulations. As a pressure device, the maximum system pressure should not exceed 0.6 MPa. If the system pressure is higher, a pressure reducing valve must be installed. A safety valve (e.g., ZB-4) must be screwed to the 3/4″ connector [1] (fig.2) using a reducing union, following the direction indicated by the arrow on the valve body. It is critical that no cut-off valve or flow reducer is installed between the cylinder and the safety valve, or on the outlet. The safety valve must be visibly located for easy and quick leakage control. A wye with a drain valve should be installed between the cylinder and the safety valve, and a cut-off valve on the cold water inlet. The domestic hot water inlet is connected to the 3/4″ connector [2] on top of the cylinder (fig.2). Additionally, each hot water cylinder includes a 3/4'' [19] connector for connection to the domestic hot water circulation system.

Before start-up, all pipe connections must be checked, and the device installation procedures followed. The hot water cylinder, central heating system, and heating coil must be filled with water by:

1. Turning on the valve on the cold water inlet.
2. Turning on the hot water outlet valve until water flows without air bubbles, indicating the tank is full.
3. Turning off the outlet valves.
4. Turning on the valves connecting the heating system with the hot water cylinder.
5. Checking for leaks.
6. Checking the safety valve performance as described in the "Operation" section.

During operation, the rated temperature of the hot water cylinder should not exceed 80°C. Damage to the thermal insulating cover due to cylinder overheating is not covered by the warranty. It is crucial not to use the device if there is any probability of safety valve failure.

Maintenance Features

Regular maintenance is essential for the safe and reliable operation of the KOSPEL domestic hot water cylinder. Key maintenance activities include:

• Safety Valve Check: The safety valve performance should be checked every 14 days. This involves turning the valve cup to the left (or right) and lifting it to allow water to come out. The cup should then be returned to shut off the incoming water flow. If water does not come out, it indicates a broken valve, and the device should not be used until repaired.
• Cylinder Cleaning: The inside of the cylinder should be cleaned periodically. The frequency of cleaning depends on the hardness of the water in the area.
• Magnesium Anode Inspection and Replacement: The cylinder is equipped with a magnesium anode for anticorrosion protection. The wear condition of this anode must be inspected annually. The anode rod should be replaced once every 18 months to ensure continued protection against corrosion.
• Water Heating for Hygiene: Periodically, the water should be heated to 65°C for hygiene reasons.
• Insulation: It is recommended to insulate the outlet and inlet pipes of the coil to minimize heat loss.

Any failures or malfunctions should be reported to an authorized service provider. It is important to note that a small amount of water leaking from the outlet pipe of the safety valve is a normal effect of the device's operation and should not be stopped, as doing so can cause device failure. The activities listed above, such as safety valve checks, cleaning, anode replacement, and insulation, are generally considered beyond the scope of warranty and are the responsibility of the user.

For emptying the cylinder, the following steps should be followed:

1. Turn off all valves connecting the cylinder with the heat circulation system.
2. Turn off the valve on the cylinder's cold water inlet.
3. Turn on the drain valve.