Baxi Potterton 21 SL Service Manual download pdf (Page 11)

6.0 SYSTEM DETAILS

6.1 Information

1. The Main Combi 24 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 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.

• 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

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 Technical Enquiries.

6.3 Bypass

1. The boiler is fitted with an automatic integral bypass.

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. An integral electro-mechanical or electronic timer is

available as an optional extra.

3. For optimum operating conditions and maximum

economy the fitting of a programmable thermostat is

recommended.

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Baxi Potterton 21 SL Service Manual Page 11

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