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Concord CX

- Installation

GENERAL

1mm of lime reduces the heat transfer from metal to water by
10%.

In practice the deposition of these salts is liable to cause
noises from the boiler body or even premature boiler failure.
Corrosion and the formation of black iron oxide sludge will
ultimately result in premature radiator failure.

Open vented systems are not completely sealed from the
atmosphere if proper venting and expansion of system water
is to be achieved. The same tank is used to fill the system
with water and it is through the cold feed pipe that system
water expands into the tank when the boiler passes heat into
the system. Conversely, when the system cools, water
previously expelled is drawn back from the tank into the
system together with a quantity of dissolved oxygen.

Even if leakage from the heating and hot water system is
eliminated there will be evaporation losses from the surface of
the tank which, depending upon ambient temperature, may be
high enough to evaporate a large portion of the system water
capacity over a full heating season.

There will always be corrosion within a heating or hot water
system to a greater or lesser degree, irrespective of water
characteristics, unless the initial fill water from the mains is
treated. Even the water in closed systems will promote corrosion
unless treated. For the reason stated,

Caradon Plumbing

Limited

strongly recommend that, when necessary, the system

is thoroughly cleaned, prior to the use of stable inhibitor, which
does not require continual topping up to combat the effects of
hardness salts and corrosion on the heat exchangers of the boiler
and associated systems.

Caradon Plumbing Limited

advise contact directly with

specialists on water treatment such as:

Pressure vessels used must comply with BS. 4814 and must
be sized on the basis of the total system volume and initial
charge pressure.

Initial minimum charge pressure should not be less than 0.5
bar (7.2 psi) and must take account of static head and
specification of the pressurising equipment. The maximum
water temperatures permissible at the point of minimum
pressure in the system is specified in Guidance Note PM5.

When make-up water is not provided automatically it will be
necessary to fit controls which shut down the plant in the
event of the maximum system pressure approaching to within
0.35 bar (5 psi) of safety valve setting.

Other British Standards applicable to commercial sealed
systems are:-

BS. 6880: Part 2.
BS. 1212
BS. 6281: Part 1
BS. 6282: Part 1
BS. 6283: Part 4

Working pressure 4.5 bar maximum.

Particular reference should be made to BS. 6644: Section 2;
Subsection 11 and Guidance note PM5 "Automatically
controlled steam and hot water boilers" published by the
Health and Safety Executive.

The information and guidance given below is not intended to
override any requirements of either of the above publications
or the requirements of the local authority, gas or water
undertakings.

In general commercial closed pressurised systems are
provided with either manual or automatic water make up.

On both instances it will be necessary to fit automatic controls
intended to protect the boiler, circulating system and ancillary
equipment by shutting down the boiler plant if a potentially
hazardous situation should arise.

Examples of such situations are low water level and operating
pressure or excessive pressure within the system. Depending
on circumstances, controls will need to be either manual or
automatic reset. In the event of shutdown both visual and
audible alarms may be necessary.

INSTALLATION REQUIREMENTS

The appliance must be installed by a CORGI ( ) registered
installer.

The installation of the boiler must be in accordance with the relevant
requirements of the Gas Safety Regulations, current I.E.E.
(BS.7671) Regulations, Model Water Bye-laws, local water
authority bye-laws and it should also comply with any relevant
requirements of the local gas region, local authority and the relevant
British Standard Codes of practice and building regulations.

FOR SMALL PIPE INSTALLATIONS:

BS. 6891;

Installation of low pressure pipework

FOR LARGE PIPE INSTALLATIONS:

British Gas Publications:

IM11:

Flues for Commercial and Industrial Gas Fired
Boilers and Air Heaters.

Gas Installations

IGE-UP-1: Purging Procedures of Non-domestic Gas

Installations. Soundness Testing Procedures for
Industrial and Commercial.

IGE-UP-2: Guidance notes on the Installation of Gas Pipework,

Boosters and Compressors in Customer’s Premises
Equal to or Greater than 25mm (Non-domestic).