Technical data

6.0 System Details – page 9
6.1 Information
1. The Baxi Bahama 100 Combination Boiler is a ‘Water Byelaws Scheme - Approved Product’. To comply with the Water
Byelaws your attention is drawn to the following installation requirements and notes (IRN).
a) IRN 001 - See text of entry for installation requirements and notes.
b) IRN 116 - Byelaw 90 and 9l.
c) IRN 302 - Byelaw 14.
2. Reference to the WRC publications, ‘Water fittings and materials directory’ and ‘Water supply byelaws guide’ give full
details of byelaws and the IRNs.
6.2 Central Heating Circuit
1. The appliance is suitable for fully pumped SEALED SYSTEMS ONLY.
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 7593:1992 “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
7593:1992.
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 Baxi Helpline.
6.3 Bypass
1. The boiler has an integral pre-set bypass and in most cases this should suffice. However in certain circumstances, e.g.
on systems where there is a high resistance and TRV’s are fitted to all the radiators it may be necessary to fit an
external by-pass. This should be of the automatic type and not a gate valve or ball type valve. The valve must be fitted
between the heating flow and return to the boiler before any other part of the system, i.e. Radiators, Diverter valves etc.
If there are any doubts, contact the technical help line. (see page 7 for flow rates).
6.4 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.
2. Suitable timer kits are available as optional extras.
3. For optimum operating conditions and maximum economy the fitting of a programmable thermostat, such as one of the
Baxi Bahama 100 Controllers, is recommended.