Charnwood LA30iB Central Heating System, System Controls, Fitting the Fire

breast, one in the front to give access for infilling and fixing the flue pipe, and one in the side to give access for the pipework.

CENTRAL HEATING

SYSTEM

The central heating system must comply with BS:5449 part 1.

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. 7 and 8. 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 7. and 8.

If the fire is used to heat a small central heating system then the heat output to the room from the fire will

This Dimension Is The
Minimum Level Area
Required To Enable The
DoorsTo Be Opened.
For Overall Sizes Of
Hearth SeeThe
Section Titled "Hearth".
405 mm
400 mm
Minimum
Fig. 5. Limiting Dimensions
of Hearth
The shaded area on the face of
the surround is the minimum flat
area required.
750 mm
B	660 mm
A
Dim.A:
Max.470mm(18 - 1/2")
Min.405mm(16")
Dim.B:
Max.575mm(22 - 2/3")
Min.555mm(21 - 3/4")
Fig. 6. Limiting Dimensions
of Surround and Opening

be reduced. Fig. 4. 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

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LA30iB 3.99

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.

FITTING THE FIRE

In some cases it may be necessary to place the connecting flue pipe in the chimney before fitting the fire into the fireplace.

Apply fire cement to the rear face of the sealing flange on the appliance. Fit the appliance into the opening ensuring that it is central and that a good seal is made between the sealing flange and the face of the surround.

Remove any excess fire cement from around the sealing flange.

The fire should be screwed to the hearth through the holes at the base of the sealing flange.

Connect the heating system to the boiler ensuring that the primary flow pipe rises from the fire. Fill the system with water and check for leaks.

FLUE CONNECTION

AND INFILLING

Make the flue connection with the special 150° elbow part no. 010/AV12. Please note that this item is ordered separately from the appliance. The legs of the elbow may be cut on site to suit the chimney. Also note that the legs of the elbow are different lengths to enable some situations to be catered for by turning the elbow around.

The end of the flue pipe must line up