WilTec SK-9 - User Manual

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Summary

Introduction and Usage

Product Usage

Details on the application and suitability of the SK-22B pressure switch for compressors.

Safety Regulations

Essential safety precautions and guidelines for using the pressure switch to prevent injury or damage.

Operation and Configuration

Setting Instructions

Step-by-step guide on how to adjust the switch-on and switch-off pressure settings.

Dimensions and Components

Information on the physical dimensions and identified parts of the pressure switch.

This document describes the operation and technical specifications of the WilTec SK-9 Pressure Switch, designed for use in house water systems. The device, identified by item number 50622, is a crucial component for controlling water pumps by regulating their switch-on and switch-off pressures.

Function Description

The SK-9 Pressure Switch acts as a control unit for water pumps, automatically switching them on and off based on pre-set pressure thresholds. It is suitable as a replacement part for many common compressors, including those used in workshops or mobile compressors. A key feature is its continuous adjustability for both the switch-on and switch-off pressures, allowing users to fine-tune the pump's operation to specific system requirements. The SK-9 can also switch three phases, meaning it can control both the phase and neutral lines simultaneously. This functionality ensures efficient and safe operation of water systems by maintaining desired pressure levels and preventing continuous pump operation when not needed. For pumps with an output exceeding 1.1 kW, it is recommended to connect a commercially available power protection device or a corresponding power relay. Furthermore, with a 380 V power protection, the SK-9 can also control 380 V/400 V three-phase pumps, expanding its versatility.

Important Technical Specifications

The SK-9 Pressure Switch is designed with robust specifications to ensure reliable performance:

Voltage (V): 220-240 V, making it compatible with standard European electrical systems.
Max. current (A): 10 A, indicating its capacity to handle typical pump loads.
Phases: 1 (phase and neutral at the same time), highlighting its ability to control single-phase systems comprehensively.
Max. operating pressure (bar): 6 bar, defining the maximum pressure the switch can withstand during operation.
Pressure setting range (bar): 1.4-4.1 bar (continuously adjustable), providing a wide range for setting the pump's switch-off pressure.
Starting pressure setting range (bar): 1.4-2.8 bar (continuously adjustable), allowing precise adjustment of the pump's switch-on pressure.
Connections (mm): 13 (1/4") (internal thread), specifying the standard connection size for integration into water systems.
Operation temperature (°C): 0-55 °C, indicating its operational temperature range.
Colour: Black, for a standard, unobtrusive appearance.
Protection class: IP44 (splashproof), ensuring protection against solid objects larger than 1 mm and splashes of water from any direction, making it suitable for environments where it might be exposed to moisture.

The device's nominal current is 16 A and nominal voltage is 230 V, as indicated in the pressure range graph. The factory setting for the pressure range is 1.4-2.8 bar, which falls within the adjustable limits.

Usage Features

The SK-9 Pressure Switch offers straightforward usage and adjustment:

Continuous Adjustability: Both the switch-on and switch-off pressures can be continuously adjusted, providing flexibility to match various application needs.
Setting Procedure:
1. Loosen the differential pressure nut (2).
2. Set the desired switch-on pressure using the relevant adjustment (1).
3. Screw in the differential pressure nut (2) to set the switch-off pressure. This intuitive process allows users to easily configure the pump's operation.
Safety Precautions:
- Always use an earthed power supply with the correct line voltage.
- Never use a defective power cord.
- Do not open the device in damp or wet environments, and protect it from direct sunlight.
- Install the device in a protected location to prevent accidental damage or tripping hazards.
- Ensure sufficient cooling by ambient air and avoid heat build-up.
- The device is designed for easy integration into existing water systems due to its standard connection size and clear operational guidelines.

Maintenance Features

The SK-9 Pressure Switch is designed for minimal user maintenance, emphasizing safety and professional handling:

Cleaning: Before cleaning, always pull the power plug. Use only a damp cloth for cleaning, avoiding cleaning agents and ensuring no liquid penetrates the device.
No User Serviceable Parts: The device contains no user-serviceable parts. All maintenance, adjustment, and repair tasks must be performed by qualified specialists. This policy ensures the integrity of the device and adherence to safety standards.
Warranty: The 2-year warranty period may expire in cases of external interference or unauthorized repairs, reinforcing the importance of professional service.
Documentation: Users are urged to read and follow the operating instructions and safety information carefully before initial use and to keep these instructions safe for future reference. This ensures proper operation and helps prevent issues that might arise from incorrect handling or installation.

The WilTec Wildanger Technik GmbH emphasizes that technical changes are reserved, and illustrations, functioning steps, and technical data may differ insignificantly due to further developments. The company encourages users to contact them with any suggestions for improvement or identified irregularities in the documentation. Disposal of the device must comply with EU guidelines for waste electrical and electronic equipment (WEEE, 2012/19/EU), meaning it should not be disposed of with domestic waste but rather at designated recycling collection points. This commitment to environmental responsibility is highlighted by the crossed-out wheeled waste bin logo on the product.