SECURE 425 Tiara Electro-Mechanical Programmers Instruction Manual
- June 6, 2024
- SECURE
Table of Contents
425 Tiara / Diadem Electro-mechanical Programmers
User Operating Instructions
The 425 Tiara and Diadem programmers are 2 circuit central heating and hot
water programmers able to switch ON and OFF twice every 24 hours. An advance
switch is provided to make temporary overrides to the ON or OFF periods and a
selector switch gives a further choice of programmes.
The 425 Tiara / Diadem Programmer
The simple instructions contained in this user guide are designed to help with
the programming and operation of these units.
Setting The Time Of Day
The dial rotates clockwise and makes one complete revolution every 24
hours.
To set the correct time turn the dial clockwise by hand (using the levers on
the clock face) until the correct time of day is against the line marked TIME.
(See diagram opposite)
Setting The On/Off Times
The four setting tappets, coloured red and blue, are moved around the
circumference of the dial to set your required ON and OFF times.
These tappets work in pairs to switch the system ON and OFF.
– No 1 (red) 1st ON and No 2 (blue) 1st OFF
– No 3 (red) 2nd ON and No 4 (blue) 2nd OFF The tappets may be moved in either
direction. (See diagram)
Please ensure that you press and hold down any tappet that is to be moved,
release the tappet only once the correct time position has been reached.
Tappets cannot be moved across the Timeline. The position of the dial may have
to be altered to set the initial ON/OFF time.
Please ensure the clock is set to the correct current time after altering the
ON/OFF settings.
Lightly Press Down On No 1 Tappet. Move Tappet Until Reaching The Desired On
Time
Lightly Press Down On No 2 Tappet. Move Tappet Until Reaching The Desired Off
Time
Repeat Previous Instructions For 2nd On/Off Settings. Using Tappets 3 And 4
Move The Programme Selection Switch To The Required Position On Either HW
And/Or CH
Manual Overrides
Advanced Control
The advance control allows you to start an ON or OFF period early without
altering the tappet, time or programme selection settings.
Moving the advance control to the extreme right brings forward the operation
of the next tappet. The switch state indicator then changes to the appropriate
number. When the next tappet passes the timeline, normal operation returns.
When the programme selector is in the All Day position, tappets 2 and 3 do not
operate. If you require switching the system OFF for the day, after the
morning switch ON, you will need to step forward with the advance switch until
the number 4 is shown in the switch state indicator.
If you wish to switch ON and OFF by hand or vice versa, before the next
automatic switching operation, the advance control must be operated until the
switch state indicator is returned to the correct automatic sequence.
EXAMPLE: If you turn the system ON again after the preset night shut
downtime when you turn it OFF before retiring make sure to operate the advance
switch again until the number 4 is displayed in the switch state indicator so
that the red tappet number 1 will switch the system ON in the morning.
DO NOT OPERATE THE ADVANCE SWITCH WHEN A TAPPET IS AGAINST THE TIMELINE.
Switch State Indicator
Located above the ADVANCE switch, the switch state indicator shows you the
number of the tappet which operated last.
Eg. If the system was switched ON by tappet 1 at 7:00 am and it is now 9:00
am, providing that no further tappets operations have past, a number 1 should
show in the aperture.
If the switch state indicator does not agree with the programme set on the
dial, rotate the dial one whole turn and reset to the correct time of day.
This will ensure that the switch state corresponds to the last tappet
operation
Programme Override Facilities
The hot water (HW) or central heating (CH) may be individually overridden as
shown below: (options are limited on gravity systems)
24 Hrs – T he system will be permanently ON
All Day – The system will switch ON from tappet 1 (red) and OFF at tappet
4 (blue) Tappets 2 and 3 are ignored
Twice – The system switches ON at tappet 1 (red), OFF at tappet 2 (blue),
ON at tappet 3 (red) and OFF at tappet 4 (blue)
Off – The timer continues to operate but the system will be permanently
OFF
Fully Pumped or Gravity Systems
Fully Pumped – On this type of installation, the selectors are not
interlocked, as illustrated. Hot water and central heating programmes can be
set independently of each other.
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 as illustrated.
Indicators – Diadem Only
The indicators 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 Thermostat(s).
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.
What is a programmer?
… an explanation for householders.
Programmers allow you to set ‘On’ and ‘Off’ time periods. Some models switch
the central heating and domestic hot water on and off at the same time; while
others allow the domestic hot water and heating to come on and go off at
different times.
Set the ‘On’ and ‘Off’ time periods to suit your own lifestyle. On some
programmers you must also set whether you want the heating and hot water to
run continuously, run under the chosen ‘On’ and ‘Off’ heating periods, or be
permanently off.
The time on the programmer must be correct. Some types have to be adjusted in
Spring and Autumn at the changes between Greenwich Mean Time and British
Summer Time.
You may be able to temporarily adjust the heating programme, for example,
‘Override’, ‘Advance’ or ‘Boost’. These are explained in the manufacturer’s
instructions.
The heating will not work if the room thermostat has switched the heating off.
And, if you have a hot-water cylinder, the water heating will not work if the
cylinder thermostat detects that the hot water has reached the correct
temperature.
Service and Repair This programmer is NOT user-serviceable. Please do not
dismantle the unit. In the event of a fault developing please contact a local
heating engineer or a qualified electrician.
Secure Meters (UK) Limited
South Bristol Business Park,
Roman Farm Road, Bristol BS4 1UP, UK
t: +44 117 978 8700
f: +44 117 978 8701
e: sales_uk@Securemeters.com
www.Securemeters.com
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Part Number P27647 Issue 15