Yeoman YM-CL8HB User Manual download pdf (Page 27)

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 And 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.

CENTRAL HEATING SYSTEM

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.

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 Technical Specifications.

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

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Yeoman YM-CL8HB User Manual Page 27

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