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Manual Horstmann 425 Diadem Thermostat

Name: Horstmann 425 Diadem Thermostat
Brand: Horstmann
SKU: 425 Diadem
Rating: 33 (3 reviews)

Need a manual for your Horstmann 425 Diadem Thermostat? Below you can view and download the PDF manual for free in English. This product currently has 2 frequently asked questions, 1 comment and has 3 votes with an average product rating of 33/100. If this is not the manual you want, please contact us.

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Manual

PAGE 4

LEAFLET No P27673

ISSUE 1

REMOVING THE PROGRAMMER

For your safety removal should only be carried out by a qualified

person.

WARNING: THE UNIT MUST BE ISOLATED FROM THE MAINS SUPPLY

BEFORE REMOVAL.

The time control can be removed from its Backplate

without disturbing the wiring. To remove the unit, loosen the two

captive screws on the top of the unit and firmly pull the control

from the top and down in an arc motion.

Replacing the unit is the reverse of the above instruction, first

engaging the lugs in the flange at the bottom of the Backplate.

ENDVIEWOF425 CORONET-TIARA-DIADEM

The 425 Range of traditional Electro-mechanical

Programmers offer a simple yet effective way

of controlling your environment. The twin circuit

Diadem and Tiara will also allow you to have

independent control of Hot water and Central

heating.

FRONT VIEW OF 425 CORONET

FRONT VIEW OF 425 TIARA - DIADEM

(NEON INDICATOR ON DIADEM ONLY)

GRAVITY OR FULLY PUMPED SYSTEMS

425 DIADEM - TIARA

Gravity - On this type of system it is possible to have

Hot water without Central heating, but not Central heating

without Hot water. In this case the installer would have

interlocked the select switches.(See diagram)

Fully Pumped- On this type of installation the

selectors are not interlocked and Hot water and Central

heating programmes can be set independently of each

other.

ADVANCE

CONTROL

DIAL

TAPPETS

DIAL

ADVANCE

CONTROL

GET TO KNOW YOUR PROGRAMMER

NEON INDICATOR - DIADEM ONLY

The neon indicator will illuminate when the appropriate Hot water and/or Central Heating circuits of

the time control are ON, even if the circuit is switched OFF by the Thermostats. However, with certain

Fully pumped systems, the neon indicator may remain lit when the time control is in the OFF position.

This does not affect the normal operation of the unit.

SERVICE AND REPAIR

This programmer is NOT user serviceable. Please do not dismantle the unit.

In the unlikely event of a fault developing please contact a local heating engineer or a qualified

electrician.

Horstmann Controls Limited

Bristol

BS4 1UP

Email: [email protected]k

Website: www.horstmann.co.uk

PROGRAMME

SELECTOR

TIME POINTER

NEON

INDICATORS

PROGRAMME

SELECTORS

TIME POINTER

Download manual in English (PDF, 0.31 MB)

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Rating

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3 votes

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Here you can share what you think about the Horstmann 425 Diadem Thermostat. If you have a question, first carefully read the manual. Requesting a manual can be done by using our contact form.

Roy 06-02-2023
My horstmann 425 diadem heating control has started "ticking" very loudly. Can you explain a reason for this, and what I can do to stop it? Thanks

reply | This was helpful (0)

More about this manual

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Specifications

Brand	Horstmann
Model	425 Diadem
Category	Thermostats
File type	PDF
File size	0.31 MB

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Frequently Asked Questions about Horstmann 425 Diadem Thermostat

Our support team searches for useful product information and answers to frequently asked questions. If you find an inaccuracy in our frequently asked questions, please let us know by using our contact form.

What is the dead zone of a thermostat? Verified

Many modern thermostats have a dead zone. If the temperature deviates less than 4°C from the set temperature, the system will not heat or cool. This so called dead zone of the thermostat prevents the system from turning on and off too often, saving energy.

This was helpful (1756) Read more

What is the best place to mount a thermostat? Verified

The best place for a thermostat is approximately 1,5 meter above the ground. Never place the thermostat nead a radiator or other heat emitting equipment or in direct sunlight. Choose a room that is used often. In most cases this is the living room.

This was helpful (1128) Read more