Danfoss 103 - User Manual

Installation and User Guide
Danfoss Heating
103
Electro-mechanical 24 hour
timeswitch for controlling hot water and heating
(Including Factory Replacement Units FRU)

Summary

Installation Instructions

Product Specification

Technical specifications for the 103 timeswitch, including power supply, ratings, and dimensions.

Installation Guide

Wiring Diagrams

Understanding Timeswitches

What is a Programmer?

Basic explanation of timeswitch programmers for householders.

User Instructions

Your Timeswitch Overview

Overview of the 103 timeswitch's capabilities and operating modes.

Setting the Time of Day

Instructions for setting the current time on the 24-hour clock display.

Setting the Programme

Guide on adjusting tappets for ON/OFF times on the timeswitch.

Selecting Operating Mode

How to choose between programmed, constant ON, or constant OFF system modes.

Overriding the Programme

Instructions for temporarily altering the programmed schedule using the pre-selector wheel.

Support and Contact Information

Contact Local Heating Engineer

Guidance on seeking help from a qualified heating engineer for issues.

Technical Support and Website

Contact details for technical assistance and the official Danfoss heating website.

Request Large Print Version

Information on obtaining large print versions of the instructions.

Overview

1. Function Description
2. Usage Features
3. Maintenance Features

The Danfoss 103 is an electro-mechanical 24-hour timeswitch designed for controlling both hot water and heating systems. It is a single-channel programmer, meaning it manages both functions simultaneously. This device allows users to set specific "On" and "Off" periods for their heating and hot water, aligning with their daily routines and lifestyle.

Function Description

The core function of the Danfoss 103 timeswitch is to automate the operation of a heating and hot water system over a 24-hour cycle. It utilizes a mechanical dial with tappets to define these operational periods. The device is capable of providing either two "On" and two "Off" periods per day, or a single "On" and "Off" period, depending on the user's preference and the configuration of the pre-selector wheel.

The timeswitch integrates with the existing heating system, typically connecting to a boiler and, if present, a hot water cylinder. It acts as a control point, switching the system on or off based on the programmed schedule. The operation of the heating system is also influenced by a room thermostat, which will switch the heating off if the desired room temperature is reached. Similarly, if a hot water cylinder is present, a cylinder thermostat will prevent the water heating from operating once the hot water has reached its set temperature, even if the timeswitch is in an "On" period.

The device offers different operating modes, which can be selected manually via a rocker switch located on its side. These modes include:

• TIMED: In this mode, the heating and hot water system follows the set programmed "On" and "Off" periods. This is the standard operational mode for automated control.
• CONSTANT ON: This mode overrides the programmed schedule, keeping the heating and hot water system continuously "On." This is useful for periods when continuous heating or hot water is required, such as during exceptionally cold weather or when there's a higher demand.
• CONSTANT OFF: In this mode, the heating and hot water system remains continuously "Off," regardless of the programmed schedule. This is suitable for times when no heating or hot water is needed, for example, during summer months or when the property is unoccupied for an extended period.

Beyond these primary modes, the timeswitch also features a pre-selector wheel, which allows for temporary overrides of the set programme. This is particularly useful when a user's routine changes unexpectedly, and they need to adjust the heating or hot water schedule for a short duration without altering the main programme. For instance, if the heating is programmed to come on at 4 pm but the user arrives home at 2 pm and requires immediate heating, the pre-selector wheel can be used to turn the system "On" earlier. The system will then revert to the set programme at the next scheduled operation. The pre-selector wheel can also be used to select "ALL DAY ON" (one "On" and one "Off" period) or "ALL DAY OFF" for temporary, extended periods.

Usage Features

The Danfoss 103 is designed for straightforward user interaction, with clear visual indicators and mechanical controls.

• Setting the Time of Day: The device features a 24-hour clock dial on its front. To set the current time, the dial cover is removed by turning it slightly to the left and pulling it off. The dial is then rotated clockwise until the correct time aligns with the "TIME" mark. It is crucial to always turn the dial clockwise to avoid damaging the mechanism. Users are reminded to reset the time after any power cuts and during seasonal clock changes (Spring and Autumn).
• Setting the Programme: The programming of "On" and "Off" periods is achieved using red and blue tappets located around the dial. The dial cover must be removed for this. Users decide their desired "On" and "Off" times for hot water and heating. Red tappets (A and C) are used to set the "On" times, while blue tappets (B and D) are used for the "Off" times. These tappets are slid around the dial knob to the corresponding hours. While they may be stiff to move, they can be adjusted in either a clockwise or anti-clockwise direction for convenience. After setting the tappets, the dial should be rotated completely at least twice, clockwise only, to ensure the mechanism is clear and the programme is correctly engaged.
• Selecting Operating Mode: The rocker switch on the side of the unit provides an easy way to switch between the "TIMED," "CONSTANT ON," and "CONSTANT OFF" operating modes. The current status of the timeswitch (e.g., "OFF UNTIL C") is visible on a wheel at the top right-hand corner of the unit, offering immediate feedback on the system's state.
• Temporary Overrides (Pre-Selector Wheel): The pre-selector wheel allows for temporary adjustments to the programme. By turning this wheel anti-clockwise, users can manually switch the unit "On" when it is scheduled to be "Off," or vice versa. For example, if the heating is "Off" but needed, turning the wheel anti-clockwise until it displays "ON UNTIL D" will activate the heating. The system will then revert to the programmed schedule at the next scheduled operation. The pre-selector wheel also offers pre-selections like "ALL DAY ON" (displaying "ON UNTIL D") or "ALL DAY OFF" (displaying "OFF UNTIL A") for more extended temporary changes. A critical note for users is to avoid operating the pre-selector wheel when a tappet is close to the "TIME" mark, as this could alter the time of day setting, requiring a manual reset of the clock.

Maintenance Features

The Danfoss 103 is designed for durability and minimal user maintenance, primarily focusing on ensuring correct operation and protection during installation or non-use.

• Initial Setup and Mechanism Clearing: During installation, after connecting the wiring, a crucial step involves removing any protective tape from the pre-selector wheel and the dial cover. The dial cover is then removed, and the clock dial is rotated two complete revolutions to clear the internal mechanism. This ensures that all components, including the selector switch and tappets, operate correctly from the outset.
• Protection During Non-Use: If the unit is to be left turned off for an extended period, especially in a dusty environment, it is recommended to re-affix the protective tape over the pre-selector wheel. This helps to shield the mechanism from dust and debris, preserving its functionality. It is important to remember to remove this tape before putting the unit into service.
• Dust and Debris Clearance: During installation, it is emphasized that all dust and debris should be cleared away from the area before plugging the module into the wallplate. This prevents foreign particles from interfering with the electrical connections or the mechanical operation of the timeswitch.
• Power Cut and Seasonal Adjustments: While not a maintenance task in the traditional sense, users are responsible for resetting the time after any power cuts and when daylight saving time changes occur (Spring and Autumn). This ensures the programmed schedule remains accurate.

The Danfoss 103 is a robust and user-friendly timeswitch, providing reliable control over heating and hot water systems with options for both automated scheduling and temporary manual overrides to suit varying household needs.

Danfoss 103 Specifications