Baxi 35/80 IE, Installation & Servicing Instructions Manual

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For optimum performance after installation this boiler and its associated central
heating system must be flushed. A means of achieving this is by following the
guidelines given in BS 7593 "Treatment of water in domestic hot water central
heating systems".
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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 (+44 151 420 9563) or
Fernox (+44 1799 550 811) directly.
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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
used. The correct dosing is obtained by following 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.)
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For information or advice regarding any of the above contact Heatmerchants
Technical Enquiries on 090 - 6442303.
6.2 Bypass
1. The boiler is fitted with an automatic integral bypass.
6.3 System Control
1. The boiler is designed for use in a heating system that incorporates external controls, i.e. a
minimum of a timer device.
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6.4 System Filling and Pressurising
1. A filling point connection on the central heating return pipework must be provided to
facilitate initial filling and pressurising and also any subsequent water loss
replacement/refilling.
2. The filling method adopted must be in accordance with the relevant Water Supply
regulations and use approved equipment. Your attention is also drawn to the current edition of
I.S. 813.
3. The sealed primary circuits may be filled or replenished by means of a temporary
connection between the primary circuit and a supply pipe provided a 'listed' double check
valve or some other no less effective backflow prevention device is permanently connected at
the inlet to the circuit and the temporary connection is removed after use (
Fig. 3 ).