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Stovax View 7 Inset High Output Boiler Inset Manual

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7. Electrical Supply
7.1 Electrical connections must meet the requirements of
national Building Regulations† and standards‡, along with
any European, local regulations and working practices that
may apply. Should conflict occur between these instructions
and these regulations then the regulations must be followed.
The connection to the mains supply should allow
complete electrical isolation and only serve the heating
circuit pump.
All water connections should be completed by a competent
person to meet the requirements of local water authority
by-laws.
CONVENTIONAL PIPEWORK SYSTEMS
All pipe work must be able to operate at above 100
degrees Celsius. Any pipe work installed in an exposed
position e.g. loft space must have provision to prevent
freezing.
Ensure the pipe work system has sufficient drain
points to enable the complete removal of water for the
purposes of servicing.
8. Gravity Pump Circuit
8.1 To prevent the risk of boiling it is essential to arrange the
pipe work and position the hot water cylinder and heat leak
radiator so that gravity circulation can take place when the
pump is not running. Position the cylinder and the radiator
vertically above the boiler with sufficient height to encourage
gravity flow.
8.2 Horizontal pipe work in a gravity system must have an
incline of at least 5mm in every 1000mm and a minimum
diameter of 28mm. Vertical pipe must have a minimum
diameter of 22mm.
8.3 Any motorised valves fitted in this circuit must return to the
fully open position when the power is interrupted.
9. Pump Assisted Central Heating
9.1 The most common arrangement is to have a pumped central
heating circuit combined with a gravity hot water circuit. This
arrangement requires careful balancing of the two in order
to avoid the gravity circuit being starved when the pump is
running.
To overcome this problem it is common practice to fit an
injector tee where the pumped central heating return re-joins
the gravity return from the hot water cylinder. This injector tee
induces a much stronger gravity flow when the pump runs.
Only use proprietary injector tees, homemade ones are
difficult to get right.
9.2 When installing a system that has pumped central heating
and gravity hot water it is recommended to use all 4
boiler tappings. Each flow and return should be diagonally
opposite each other.
10. Fully Pumped System
10.1 In many installations (especially new build) a fully pumped
system is the best choice to give increased control.
WARNING - To prevent the risk of boiling it is essential
to arrange the pipe work and position the hot water
cylinder and heat leak radiator so that gravity
circulation can take place when the pump is not
running. Any motorised valves fitted in this circuit must
return to the fully open position when the power is
interrupted.
11. Sealed (Pressurized) System
11.1 Do not fit this appliance to sealed or pressurised systems or
an unvented hot water cylinder.
12. Pipework Diagrams
12.1 See below for a typical layout of a pumped central heating
and gravity hot water circuit.
HEATING SYSTEM CONTROLS
CONTROLS GENERAL
1.1 The controls fitted to the system will provide two functions:
— To control the comfort level in the house.
— To maintain safety in the event of misuse or mechanical
failure.
COMFORT CONTROLS
1.2 This primarily consists of a time clock wired into the pump.
The pump is switched on when heat is required and when it
is not, the pump is switched off.
The time clock, when combined with a room thermostat and
or thermostatic radiator valves, enhances the comfort levels
in the house.
Some room thermostats combine the function with the
time clock and can be programmed to reduce the room
temperature rather than turning the system off. This is
effective in not allowing the rooms to become too cold and
speeding up recovery time.
1.3 The hot water cylinder can also be fitted with a thermostatic
valve which turns off the flow when the cylinder has reached
the desired temperature but the heat leak radiator will have
to be bigger to cope with the extra load when the tank is
isolated.
SAFETY CONTROLS
1.4 This primarily consists of a high limit thermostat fitted to
thegravityflowpipesetat80˚C,thisthermostatshould
be connected to the pump so that the pump is turned on if
thetemperatureexceeds80˚C.Thiswillpreventaccidental
boiling in the gravity circuit.
Installation Instructions
… 27 …


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