Helo OVP 1 Manual Override Module for HVAC and Automation

Description

The Helo OVP 1 is a compact and reliable manual override control module designed for DIN rail mounting. It is widely used in building automation and HVAC systems to allow for manual intervention in 0-10V DC control loops. This unit features a three-position selector switch (Hand-0-Auto) and an adjustable potentiometer for precise manual control. It operates on a standard 24V AC/DC power supply and includes a relay output for status feedback.

Specifications

• Manufacturer: Helo
• Model: OVP 1
• Type: Manual Override Control Module
• Supply Voltage: 24V AC/DC
• Control Signal Input/Output: 0-10V DC
• Relay Output Rating: 28V / 2A
• Mounting: DIN Rail
• Switch Positions: Hand - 0 - Auto

Label Info

• VDE 0110 IGr. C/250
• VDE 0435
• CE Marked

Application

This module is ideal for applications where manual control of actuators, such as dampers and valves, is required. It provides an essential interface for maintenance, commissioning, or emergency operation in HVAC systems, allowing technicians to bypass the automatic controller.

Country of Origin

Germany

CO2 Impact

By purchasing this refurbished Helo OVP 1, you are helping to avoid 4.0 kg of CO2 emissions. This saving is equivalent to the CO2 captured by a tree in several months or driving an average car for 20 kilometers. Choosing reused industrial parts is a sustainable choice for your business and the planet.

Availability

This item is a tested, used product in excellent working condition. Order now from PLC2Day for expert support and fast delivery.

FAQ

What is the function of the '0' position on the selector switch?

The '0' position typically de-energizes the output, forcing the connected actuator or device to its fail-safe position (e.g., closing a valve), effectively overriding both automatic and manual commands.

No, the relay output is rated for a maximum of 28V. It is a low-voltage contact intended for signaling purposes, such as providing feedback to a building management system (BMS) about the switch's status (e.g., in manual mode). It should not be used for switching 230V or other mains voltages.

In 'HAND' mode, the rotary dial acts as a potentiometer, allowing you to manually set the 0-10V DC output signal (at terminal Y). This lets you manually position a connected actuator (like a damper or valve) to any point between 0 percent and 100 percent open, independent of the automatic control signal.

Last Update: Friday, March 13, 2026

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