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Charnwood SLX 45 MKII - Multi fuel Manual

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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. 6 and 7. 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. 8. 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 1 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 1.25 kW. This is to prevent boiling in case
of pump failure. 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 6.
and 7.
If the appliance is used to heat a small central heating system then
the heat output to the room from the fire will be reduced. Fig. 4.
shows the ratio of space heating to water heating which can be
expected.
Fitting a radiator in the same room as the fire is recommended as it
will allow greater flexibility In the way that the system is operated as
well as ensuring that there is sufficient heat.
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
pipe 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
Gravity Return
(28mm Pipe)
Central Heating Return Common Return to Boiler
(28mm Pipe)
Fig. 8. Injector Tee
Fig. 7. Typical Central Heating & Hot
Water System Using 3 Tappings
Central Heating Return
Drain Cock at Lowest Point
Drain Cock
Gravity
Return
28mm
Gravity
Flow
28mm
Indirect Hot Water Cylinder
Domestic Hot Water Draw Off
Cold Water Tank
Overflow
Overflow
Feed and Expansion Tank
22mm Open Vents
Gravity Radiator
Circulating Pump
Injector Tee
Minimum Return Thermostat Central Heating Flow
12
Fig. 6. Typical Central Heating & Hot
Water System Using 4 Boiler Tappings
Central Heating Flow
Central Heating Return
Drain Cock at Lowest Point
Drain Cock
Gravity
Return
28mm
Gravity
Flow
28mm
Indirect Hot Water Cylinder
Cold Water Tank
Overflow
Feed and Expansion Tank
22mm Open Vents
Gravity Radiator
Circulating Pump
Minimum Return
Thermostat
Overflow
Domestic Hot Water Draw Off
®
charnwood
INSTALLATION INSTRUCTIONS SLX4 5
MU LT I-F UEL
faces and will thereby increase the life of the boiler. It will also
ensure that priority is given to the domestic hot water. These
thermostats are available from ourselves if you are unable to obtain
them locally.
… 12 …


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