Programme Override Facilities; Fully Pumped Or Gravity Systems; Indicators - Diadem Only - Horstmann 425 Tiara User Operating Instructions Manual

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 - The 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 on the right,
and 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 on
the right.

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 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.
5
HW CH
24 hrs
all day
twice
off
HW CH
24 hrs
all day
twice
off