3
Diadem/Tiara:
When used to control MAINS VOLTAGE SYSTEMS
Terminals L, 2 and 5 should be electrically
linked by means of a suitable piece of sleeved
conductor. When used to control EXTRA LOW
VOLTAGE SYSTEMS these links MUST NOT be
fitted.
Coronet:
When used to control MAINS VOLTAGE SYSTEMS
Terminals L and 5 should be electrically linked
by means of a suitable piece of sleeved
conductor. When used to control EXTRA LOW
VOLTAGE SYSTEMS these links MUST NOT be
fitted.
Interlocking - Diadem and Tiara only
If a Diadem or Tiara is used on gravity hot water/pumped central heating systems the selector
slides must be interlocked for correct programme selection.
This is achieved by rotating the interlock located at the top of the HW programme slide. First select
‘Twice’ on the HW selector slide, then select the Off position on the CH selector slide; this will reveal
the screwdriver slot in the interlock.
Position the screwdriver in the slot and rotate anti-clockwise until the slot is almost horizontal (a
stop will prevent the interlock from being turned too far).
Check for correct operation of programme slides. This should result in the HW selector slide moving
up to match any CH selection (twice, all day and 24 hours).
When the CH slide switch is returned to any of the lower positions (all day, twice and off), the HW
slide switch will stay in the uppermost position reached and will have to be manually moved to the
desired new position.
N
L
1
2
3
4
5
6
MAINS
SUPPLY
E N
L
ON
OFF
TIMED
OUTPUT
N
L
1
2
3
4
5
6
MAINS
SUPPLY
E N
L
ON
ON
OFF
OFF
TIMED
OUTPUT
HW
TIMED
OUTPUT
CH
