Bedienungsanleitung Stovax View 7 Inset High Output Boiler Inset (Seite 27 von 44) (Englisch)

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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

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