Manual Charnwood LA 30iB (page 12 of 20) (English)

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Gravity Return 28mm

Gravity Flow 28mm

22mm Open Vents

Cold Water Tank

Overflow

Domestic Hot Water Draw Off

Drain Cock

Indirect Hot Water Cylinder

Central

Heating Flow

Circulating Pump

Central

Heating

Return

Drain Cock at Lowest Point

Minimum Return

Thermostat

Gravity Radiator

Overflow

Feed and Expansion Tank

The shaded area on the face of

the surrond is the minimum flat

area required.

750mm

660mm

Dim.A:

Max. 470mm (18-1/2")

Min.405mm (16")

Dim.B:

Max. 575 (22-2/3")

Min. 555mm (21-3/4")

If the system is to be a combined heating and domestic hot

water system then a double feed indirect hot water storage

cylinder to BS:1566 part 1 should be used. In order to prevent

the build up of scale and corrosion a suitable inhibitor should

be used. The system must be correctly vented as shown in

Figs. 8 and 9. The height differential between the header tank

and the appliance must not exceed 15.2 metres (50 feet).

If all four boiler tappings are used then, if possible, diagonal

pairs should be connected for domestic hot water and central

heating. Where a common return is used an injector tee must

be incorporated into the system as shown in Fig. 9. This will

ensure that a good domestic hot water supply is maintained

when the central heating pump is operating.

The system must incorporate a gravity circuit which will

normally heat the domestic hot water and an unvalved

radiator with an output of at least 0.75 kW. When the

appliance is not connected to a domestic hot water system the

unvalved radiator(s) on the gravity circuit must have an output

of at least 1.0 kW. This is to prevent boiling in case of pump

failure.

If the boiler reduction brick is fitted then the appliance may be

used for room heating and supplying domestic hot water

without the need for a gravity radiator.

All pipework in the primary circuit must be 28 mm diameter

and the gravity flow pipe must rise continuously from the

boiler to the open vent. Two typical systems are shown in

Figures 8. and 9.

If the fire is used to heat a small central heating system then

the heat output to the room from the fire will be reduced.

Fig. 5. shows the ratio of space heating to water heating

which can be expected.

SYSTEM CONTROLS

The circulating pump may be controlled by means of time

switches, room thermostats or outdoor thermostats.

Radiators may be either manually or thermostatically

controlled. These controls will all work in conjunction with

the thermostat on the appliance and the minimum return

thermostat.

We recommend fitting a pipe thermostat onto the gravity

return and wiring it into the mains supply to the pump so that

if the gravity return temperature drops below 45° C then the

pump will cut out. This will help to prevent condensation

forming on the boiler faces and will thereby increase the life

of the boiler. Use of a minimum return thermostat also

ensures that priority is given to the domestic hot water. These

thermostats are available from ourselves if you are unable to

obtain them locally.

INSTALLATION INSTRUCTIONS charnwood

Fig. 8 Typical Central Heating and Hot Water System Using 4

Boiler Tapping

Fig. 7. Limiting Dimensions of Surround and Opening

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Charnwood LA 30iB Manual

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