Ariston 47-116-13, 41-116-01 Water Connections View of the Boiler Connections, Pipe Work, By-pass

2.8 Water Connections	View of the Boiler Connections
GENUS 23/27/30 MFFI	GENUS 27 RFFI SYSTEM

A

B

C

D

E

I

C

A

F

D

G

E

I

Fig. 2.5

Fitting the connection kit to the Genus 27 RFFI System only.

It will be noted that the kit has two connections not required for this boiler i.e. the domestic cold inlet “E” and the domestic hot water outlet “B” (see fig. 2.4).

Although the cold water main supply must be connected to the isolation valve for the purpose of operating the filling- loop, the isolation valve is NOT connected to the boiler and should be left in the OFF position.

The D.H.W. outlet is capped-off on the boiler, therefore not requiring the isolation valve to be used.

The Genus 27 RFFI System has 2 x 3/4" B.S.P. male threads for the cylinder flow and return. It is recommended that 2 x 22mm x 3/4" female iron fittings (not supplied) be used on these connections (using P.T.F.E. tape), before the boiler is mounted on the wall.

Legend Fig. 2.4

A = Central Heating Flow

B = Domestic Hot Water Outlet

C = Gas Inlet

D = Domestic Cold Water Inlet

E = Central Heating Return

F = Cylinder Flow

G = Cylinder 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 public access.

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