Worcester GREENSTAR 30 HE Service Manual download pdf (Page 11)

6 720 611 400 GB (03.11)

Installation

3Installation

3.1 Important remarks

B Appliance should only be installed in sealed central

heating and hot water systems.

B To avoid gas formation in the system, galvanised radi-

ators or pipes must not be used.

B If a room thermostat is used: do not fit a thermostatic

radiator valve on the radiator in the primary room.

B This appliance uses an automatically variable pump.

An auto-bypass must not be fitted.

B Add a suitable anti-freeze fluid to the water in the

central heating system.

Suitable products are available from Betz-Dearborn

Tel: 0151-4209563 and Fernox Tel: 01799-

550811.

B In our experience, the addition of sealing agents to

the water in the central heating system can cause

problems (deposits in the heat exchanger). For that

reason we advise against their use.

3.2 Domestic hot water

Any regulations specified by the local water company

must be observed.

The final 600 mm of the mains cold water connection to

the appliance should be made in copper tube only.

The appliance is suitable for a mains supply having a

maximum pressure of 10 bar. A pressure reducing valve

must be fitted, if necessary.

The hot water outlet temperature is set to be capable of

achieving a maximum of 60°C. The maximum tempera-

ture and the frequency of the recharge of the heat store

may be reset.

The water flow rate of 10.6 l/min (R 30 HE), 12.8 l/min

(R 35 HE) and 14.4 l/min (R 40 HE) will give a temper-

ature rise of 40°C. If a higher rise is required then the

flow must be reduced at the tap and the discharge tem-

perature will rise up to the maximum set figure.

The temperature rise, up to the maximum set by the

user, is automatically maintained by the modulation of

the heat input. In winter, when the mains temperature is

very low, the water flow, adjusted at the tap or shower,

should be reduced to maintain the required delivery

temperature.

It is suggested that long pipe runs to taps or showers

be insulated to prevent the rapid cooling of the water.

All types of single lever mixer taps and thermostatic

mixer units suitable for a mains pressure of up to 10 bar

can be used.

The head of a loose-head shower must not be allowed

to fall within 25 mm of the top the bath to prevent the

risk of water being drawn back into the mains. Alterna-

tively the shower must be fitted with an anti-syphonage

device at the point of the flexible hose connections.

Over-rim bidets may be connected to the appliance pro-

vided that it is in accordance with the requirements of

the local water company. The outlet(s) should be

shrouded and unable to have any temporary hand held

spray attached. No anti-syphonage arrangements are

necessary.

In exceptionally hard water areas a device to prevent

scale formation may be fitted or, alternatively, the maxi-

mum temperature reset to about 45°C which may

reduce the risk of scale formation. The installation of a

scale inhibitor assembly should be in accordance with

the requirements of the local water company. Artificially

softened water must not be used to fill the central heat-

ing system. An isolating valve should be fitted to allow

for servicing.

Devices, such as water meters or back-flow pre-

vention valves, capable of preventing the flow of

expansion water must not be fitted unless sepa-

rate arrangements have been made.

A Zilmet Z160 expansion vessel is the preferred type. A

thread sealant compatible with potable water must be

used. The vessel should be connected into the cold

water mains inlet pipe as close as possible to the appli-

ance.

3.3 Sealed systems

The appliance must not be operated without the system

being full of water, properly vented and pressurised.

The expansion vessel has a volume of 10 litres and is

charged to a pressure of 0.75 bar.

The water capacity of the system is shown in table 12,

page 30. If a greater capacity is required then an addi-

tional expansion vessel must be fitted into the system

return as close to the appliance as possible. The system

pressure can be set up to a maximum of 1.5 bar with

1bar being the normal setting.

If the system pressure is greater than 2.5 bar when the

appliance is operating at maximum temperature then an

additional expansion vessel must be fitted into the sys-

tem return as close to the appliance as possible.

The filling point must be at low level and arranged as

shown in figs. 5 and 6.

The pressure relief valve is set to operate at 3 bar.

There must be no connection to the mains without the

approval of the local water company. All connections in

the system must be capable of withstanding a pressure

of up to 3 bar and the radiator valves conform to the

B Always turn off the gas cock before car-

rying out any work on components

which carry gas.

Fixing of the appliance, gas and flue con-

nections, commissioning of the system

and electrical connections may only be

carried out by competent persons author-

ised by CORGI.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 51 52

Comments to this Manuals

No comments

Worcester GREENSTAR 30 HE Service Manual Page 11

Comments to this Manuals

Related products and manuals for Thermostats Worcester GREENSTAR 30 HE