27
Henrad SE FF
- Installation
1. Some earth wires are omitted for clarity -
ensure proper earth continuity when wiring.
2. This is a fully controlled system - set the
boiler thermostat to MAXIMUM.
3. Numbering of thermostat terminals applies
only to the manufacturer mentioned.
41 TWO SPRING CLOSED VALVES - pumped only
LEGEND
b
- blue
bk - black
br - brown
r
- red
y
- yellow
w
- white
g/y - green/yellow
gy - grey
or - orange
v
- violet
pk - pink
INSTALLATION
INST
ALLA
TION
Note.
If the boiler is installed in a garage it may
be necessary to fit a pipe thermostat.
Central heating systems fitted wholly inside the house do
not normally require frost protection as the house acts as a
'storage heater' and can normally be left at least 24 hours
without frost damage.
However, if parts of the pipework run outside the house or if
the boiler will be left off for more than a day or so then a frost
thermostat should be wired into the system. This is usually
done at the timer, in which case the timer selector switches
are set to OFF and all other controls MUST be left in the
running position.
The frost thermostat should be sited in a cold place but
where it can sense heat from the system.
Wiring should be as shown, with minimal disturbance to
other wiring of the timer.
Designation of the terminals will vary but the timer and
thermostat manufacturers' leaflets will give full details.
Diagram A shows a double-pole frost thermostat, which
should suffice for all systems which do not use the OFF
terminals of the timer.
Diagram B shows a 'changeover' frost thermostat, which
will cover most systems which do use CH OFF. If, however,
on such a system the HW pipework is in an isolated part of
the house a second frost thermostat may be used to protect
it. If in doubt ask your installer for advice.
42 FROST PROTECTION
Summary of Contents for Henrad SE 30 FF
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