6.0 System Details
9
6.1
Water Circulating Systems
1. The appliance is suitable for fully pumped
sealed systems only.
The following conditions should be observed
on all systems:
• The boiler must not be used with a direct
cylinder.
• Drain cocks should be fitted to all system low
points.
• All gas and water pipes and electrical wiring
must be installed in a way which would not
restrict the servicing of the boiler.
• Air vents should be fitted to all system high
points.
• Best practice recommends that an appropriate
size air separator is fitted, to expel the air from
the system. This will reduce corrosion potential
and maximise the efficiency within the system.
6.2
Treatment of Water Circulating
Systems
• All recirculatory water systems will be subject to
corrosion unless an appropriate water treatment
is applied. This means that the efficiency of
the system will deteriorate as corrosion sludge
accumulates within the system, risking damage
to pump and valves, boiler noise and circulation
problems.
• When upgrading existing systems that exhibit
evidence of sludging, it is advisable to clean the
system prior to treatment in order to remove any
sludge and reduce the likelihood of these
deposits damaging new components.
• When fitting new systems flux will be evident
within the system, which can lead to damage of
system components.
• All systems must be thoroughly drained and
flushed out. The recommended flushing and
cleansing agents are Betz-Dearborn Sentinel
X300 or X400 and Fernox Superfloc Universal
Cleanser which should be used following the
flushing agent manufacturer’s instructions.
• System additives - corrosion inhibitors and
flushing agents/descalers should be suitable for
aluminium and comply to BS7593 requirements.
The only system additives recommended are
Betz-Dearborn Sentinel X100 and Fernox-Copal
which should be used following the inhibitor
manufacturer’s instructions.
Failure to flush and add inhibitor to the
system will invalidate the appliance warranty.
• It is important to check the inhibitor
concentration after installation, system
modification and at every service in accordance
with the manufacturer’s instructions. (Test kits are
available from inhibitor stockists.)
• For information or advice regarding any of the
above contact the Potterton Helpline.
Boiler
Hot water
Central
heating
load
Live feed
to pump
Switch live from
programmer, etc.
S/L
N P/F
Fig. A
Wiring an extra pump to the pump feed
connection of boiler
Boiler
Connections
