Bedienungsanleitung Stovax View 7 Inset High Output Boiler Inset (Seite 25 von 44) (Englisch)

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CENTRAL HEATING SYSTEM

When designing a heating system in the UK the

following standards must be observed:

• BS EN 14336:2004 Heating Systems In Buildings,

Installation & Commissioning of Water Based

Heating Systems.

• BS EN 12828 2003 Heating Systems in Buildings,

Design of Water Based Heating Systems.

• BS EN 12831: 2003 Heating Systems in Buildings,

Method for Calculation of the Design Heat Load.

1. General

This appliance gives out heat in two ways:

—Directly into the room in which it is fitted through

convection and radiation.

—Hot water to heat radiators and domestic hot water.

The installation must comply with building regulations and

use best practice advice.

IMPORTANT:

FAILURE TO ADD AND MAINTAIN A SUITABLE

CORROSION INHIBITOR IN THE BOILER WATER

CIRCUIT MAY INVALIDATE YOUR PRODUCT

WARRANTY.

2. Boiler Sizing

2.1 It is very important to determine the correct size of appliance

for the house:

—Too big a boiler will run too hot and will not be efficient.

—Too small a boiler will not maintain the desired temperature.

2.2 Size the boiler correctly by calculating the following heat loads:

RADIATORS - the amount of heat required to run the

radiators efficiently. The correct size of radiator depends on

the required temperature for the room, the room heat losses

andtheradiatormanufacturer’sguides.

HOT WATER - the amount of heat required to provide the

desired amount of domestic hot water.

LOSSES – the amount of heat lost in pipe work - typically

10% of the combined radiators and hot water loads.

There are national guidelines for calculating these figures*.

2.3 Careful consideration must be given to where the appliance

is fitted. It must be sized correctly for the heat load required

and the size of the room. These requirements can be found

in the Installation Checklist.

2.4 All Stovax appliances are thermostatically controlled. The

burning rate is adjusted to the demands of the connected heat

load. If the radiators do not require heat then the thermostat

will act to shut down the appliance and the direct heat output

to the room where it is fitted will reduce (see heat output graph

on page 15 to show the ratio between direct heat output and

water heat output). To prevent the room becoming too cold, fit

a thermostatically controlled radiator as well as the appliance.

Installation Instructions

3. Hot Water Cylinder

3.1 The domestic hot water cylinder must be an indirect vented

double feed type to meet national standards** and should have

a minimum capacity of 117 litres. Houses with more than one

bathroom or a separate shower will need a bigger tank.

Fully insulate the tank.

The water draw off pipes to the taps should be in a dead leg

connection from the vent pipe.

4. Open Vent & Cold Feed System

4.1 This system must be fitted with a minimum of 22mm diameter

open vent discharging into a heat resisting feed and expansion

tank. There must be at least 25mm air gap between the end of

the pipe and the water level. The cistern tank should have an

overflow with a minimum diameter of 22mm.

The cold feed must be a minimum 22mm and enter the

system as the last connection on the common boiler return.

The open vent and cold feed must not be fitted with any

valves, manual or automatic.

Do not use plastic pipe in any part of the flow and return.

5. Heat Leak Radiator

5.1 A heat leak radiator must be fitted in the gravity circuit to

dissipate any excess heat produced from the boiler when

connected demand is low. The domestic hot water cylinder

may not be able to disperse heat at all times due to modern

insulation. This radiator is commonly fitted in the bathroom

and should be rated at 2kW (6500 btu) or 10% of the total

boiler output.

This radiator ensures that the appliance is not shut down

completely for long periods resulting in the fire going out.

Fit the heat leak radiator in the gravity circuit using 22mm

pipe reducing to 15mm for no more than 300mm before the

radiator.

 Fittheradiatorwithtwo‘lock-shield’valvesthatareset

in the fully open position and cannot be shut down. Use

diagonal connections. Do not fit thermostatic valves or

manually adjustable valves to the heat leak radiator.

6. Pump

6.1 Where a pump is fitted into the circuit it should be adjustable

so that the flow can match the system requirements. Fit

isolation valves to enable removal for servicing. The pump

must have at least 1.5 meters of static head.

In the Uk:

† England and Wales - Document (/ Scotland - Part N/

Building Regulations

‡ BS7671

* See BS 5449:1

** See BS 1566 Part 1 grade 3 minimum

Registered body: HETAS (GB only)/ INFO (Eire)

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