Ariston 47-116-17 installation instructions Mffi System, Water Connections

2.8.WATER CONNECTIONS

VIEW OF THE BOILER CONNECTIONS

24 MFFI

FIG. 2.5

Fitting the connection kit to the ecoGENUS 24 RFFI SYSTEM only.

A

FIG. 2.4

	C
B	D E

I

H

24 MFFI SYSTEM

It will be noted that the kit has two connections not required for this boiler i.e. the domestic cold inlet “D” 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 ecoGENUS 24 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.

SYSTEM DESIGN:

LEGEND:

C

A

F

D

G

E

I

H

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.

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

H= Condensate discharge

I= Safety valve discharge

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.

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

CONDENSATE DISCHARGE:

The condensate discharge hose from the boiler must be inserted by at least 50 mm into a suitable acid resistant pipe - e.g. plastic waste or overflow pipe. The condensate discharge pipe must have a continuous fall and preferably be installed and terminated within the building to prevent freezing.

The discharge pipe must be terminated in a suitable position:

i)Connecting in to an internal soil stack (at least 450 mm above the invert of the stack). A trap giving a water seal of at least 75 mm must be incorporated into the pipe run , there also must be an air break upstream of the trap.

ii)Connecting into the waste system of the building such as a washing machine or sink. The connection must be upstream of the washing machine/sink (If the connection is down stream of the waste trap then an additional trap giving a minimum water seal of 75 mm and an air break must be incorporated in the pipe run, as above.

iii)Terminating into a gully, below the grid level but above the water level.

iv)Into a soakway.

NOTE: If any condensate pipe work is to be installed externally, then it should be kept to a minimum and be insulated with a waterproof insulation and have a continuous fall.

AIR RELEASE POINTS:

These must be fitted at all high points where air naturally collects and must be sited to facilitate complete filling of the system.

The appliance has an integral sealed expansion vessel to accommodate the increase of water value when the system is heated.

It can accept up to 7 l (1.5 gal) of expansion water. If the heating circuit has an unusually high water content, calculate the total

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