5.0 System Details
8
5.1
Primary Circuit
1. The appliance is suitable for fully pumped
systems only. The system can be open vented
or sealed.
2. A sealed system must incorporate the
following:-
• Safety Valve
• Pressure Gauge
• Expansion Vessel
• Filling Point
Reference must be made to the specific sections
of BS5449 relating to sealed systems.
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.
• For optimum performance after installation this
boiler and its associated central heating system
must be flushed in accordance with the
guidelines given in BS 7593 “Treatment of water
in domestic hot water central heating systems”.
• This must involve the use of a proprietary
cleanser, such as BetzDearborn Sentinel X300
or X400, or Fernox Superfloc. Full instructions
are supplied with the products, but for immediate
information please contact BetzDearborn (0151
420 9563) or Fernox (01799 550 811) directly.
• For long term protection against corrosion and
scale, after flushing it is recommended that an
inhibitor such as BetzDearborn Sentinel X100,
or Fernox MB-1 or Copal is dosed in accordance
with the guidelines given in BS 7593.
Failure to flush and add inhibitor to the system
may 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.
