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Island 07.02
suitable inhibitor should be used. The
system must be correctly vented as
shown in Figs. 5 and 6. 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. 7. 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
4. and 5.
If the appliance is used to heat a very
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.
Connect the heating system to the
boiler ensuring that the primary flow
pipe rises continuously from the
appliance to the vent. Fill the system
with water and check for leaks.
SYSTEM CONTROLS
Since the controls on the stove are
manually operated we strongly
recommend using high and low limit
pipe thermostats to control the pump.
The high limit, (anti-boiling,)
Drain Cock
Indirect Hot Water Cylinder
Gravity Radiator
Domestic Hot Water Draw Off
Cold Water Tank
Overflow
Feed and Expansion Tank
22mm Open Vents
Overflow
Central Heating Flow
Central Heating Return
Drain Cock at Lowest Point
Gravity Return 28mm
Circulating Pump
Thermostat
Using 4 Boiler Tappings
Fig. 5. Typical Central Heating & Hot Water System
Gravity Return
(28mm Pipe)
Central Heating Return
Common Return to Boiler
(28mm Pipe)
Fig. 7. Injector Tee.
Drain Cock
Indirect Hot Water Cylinder
Domestic Hot Water Draw Off
Gravity Radiator
Cold Water Tank
Overflow
Overflow
Feed and Expansion Tank
22mm Open Vents
Central Heating Return
Drain Cock at Lowest Point
Gravity Return 28mm
Circulating Pump
Injector Tee
Central Heating Flow
Using 3 Tappings
Fig. 6. Typical Central Heating & Hot Water System
Low Limit
Low Limit Thermostat
Gravity Flow 28mm
High Limit Thermostat
High Limit Thermostat
Gravity Flow 28mm
Summary of Contents for COUNTRY 8B WOODBURNER MkII
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