Ariston EuroCombi Type C A27 MFFI Manuale di istruzioni per l'installazione - Pagina 9

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2.9

Water Connections

B023

A/23 MFFI - A/27 MFFI

Legend

A = Central Heating Flow

B = Domestic Hot Water Outlet

C = Gas Inlet

D = Domestic Cold Water Inlet

E = Central Heating Return

I = Safety Valve

Central Heating

Detailed recommendations are given in BS 6798:1987 and BS 5449-1:1990,

the following notes are given for general guidance.

Pipe Work:

Copper tubing to BS EN 1057:1996 is recommended for water pipes. Jointing

should be either with capillary soldered or compression fittings.

Where possible pipes should have a gradient to ensure air is carried naturally

to air release points and water flows naturally to drain taps.

The appliance has a built-in automatic air release valve, however it should be

ensured as far as possible that the appliance heat exchanger is not a natural

collecting point for air.

Except where providing useful heat, pipes should be insulated to prevent heat

loss and avoid freezing.

Particular attention should be paid to pipes passing through ventilated spaces

in roofs and under floors.

By-pass:

The appliance includes an automatic by-pass valve, which protects the main

heat exchanger in case of reduced or interrupted water circulation through

the heating system, due to the closing of thermostatic valves or cock-type

valves within the system.

System Design:

This boiler is suitable only for sealed systems.

Drain Cocks:

These must be located in accessible positions to permit the draining of the

whole system. The taps must be at least 15mm nominal size and

manufactured in accordance with BS 2870:1980.

Safety Valve Discharge:

The discharge should terminate facing downwards on the exterior of the

building in a position where discharging (possibly boiling water & steam) will

not create danger or nuisance, but in an easily visible position, and not cause

damage to electrical components and wiring.

The discharge must not be over an entrance or a window or any other type of

Fig. 2.4