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Stovax View 7 Inset High Output Boiler Inset Manual

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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)
… 25 …


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