Hard Water Areas; Bypass; System Control; Treatment Of Water Circulating Systems - Potterton Assure Heat 13 Installation And Service Manual

7684200-01 (06/17)
5.2.3

Hard Water Areas

1. If the area of the installation is recognised as a HARD WATER
AREA then this must be taken into account when filling the system.
5.2.4

Bypass

1. Where a system employs TRV's on all radiators and includes
two port zone valves an automatic bypass must also be fitted to
protect system components.
2. Existing systems with a 3 port valve may not require a bypass
depending on type of radiator valves fitted.
3. Current editions of Building Regulations and Central Heating
System Specification documents give additional guidance.
5.2.5

System Control

1. The system must be fitted with thermostats and TRVs to comply
with Part L of the Building Regulations.
5.2.6

Treatment of Water Circulating Systems

1. 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.
2. When fitting new systems flux will be evident within the system,
which can lead to damage of system components.
3. BS7593 gives extensive recommendations on system cleansing
and water treatment.
4. All systems must be thoroughly drained and flushed out using an
appropriate proprietary flushing agent.
5. A suitable inhibitor must then be added to the system.
6. All system additives (flushing agents, cleansers, inhibitors etc.)
must comply with the requirements of BS7593. Full instructions are
supplied with the products and for further information contact the
additive manufacturer directly or consult their website.
Failure to flush and add inhibitor to the system will
invalidate the appliance warranty.
7. It is important to check the inhibitor concentration after
installation, system modification and at every service in
accordance with the inhibitor manufacturer. (Test kits are available
from inhibitor stockists.)
8. For information or advice regarding any of the above contact
Baxi Customer Support 0344 871 1545.
Before Installation 5
Assure Heat 23