Worcester Greenstar Ri Manuel de service télécharger pdf (Page 9)

PRE-INSTALLATION

6 720 644 744b (2011/08)

3 PRE-INSTALLATION

3.1 CLEANING PRIMARY SYSTEMS

BEFORE CLEANING THE SYSTEM:

B Ensure that the system and pipe work is in good

working order.

B Where possible keep the existing boiler/circulating

pump in place when flushing the system.

FOLLOW THE GUIDANCE OF BS7593:

Treatment of water in domestic hot water central

heating and also the flushing guidelines below.

FLUSHING THE SYSTEM

B Fill the system with cold water and check for leaks.

B Open all drain cocks and drain the system.

B Close drain cocks and add a suitable flushing agent

compatible with aluminium at the correct strength

for the system conditions in accordance with the

manufacturer‘s instructions.

The pH value of the system water must be less than

8 or the appliance guarantee will be invalidated.

B Circulate the flushing agent before the boiler is

started.

B Run the boiler/system at normal operating

temperature as directed by the manufacturer of the

flushing agent.

B Drain and thoroughly flush the system to remove the

flushing agent and debris.

B It may be necessary to use a power flushing machine

to aid the cleansing procedure in some

circumstances.

B Close the drain cocks and refill with fresh water and

a suitable inhibitor.

B Vent any air from the boiler and system.

INHIBITOR

Add a suitable inhibitor or combined inhibitor/anti-

freeze, if the system is exposed to freezing conditions, to

the heating system in accordance with the DWTA code of

practice and manufacturer‘s guidelines.

USE IN HARD WATER AREAS:

Normally there is no need for water treatment to prevent

scale formation as the maximum temperature of the HW

heat exchanger is limited in the electronic circuit.

In areas where temporary water hardness exceeds

200 ppm, consideration may need to be given to the

fitting of a scale prevention device. In such

circumstances, the advice of the local water authority

should be sought.

3.2 MAINS SUPPLY

3.2.1 ELECTRICAL SUPPLY

• Supply: 230V - 50 Hz, 140 Watts

• Cable: PVC insulated 0.75 mm

(24 x 0.2 mm)

temperature rated to 90 °C.

• External 3A fuse to BS1362.

• The appliance must be earthed.

• Do not connected the appliance to a 3 phase supply.

• IP20.

• Wiring must comply with the latest edition of BS 7671

(IEE wiring regulations).

3.2.2 GAS SUPPLY

• Boilers using Natural Gas (NG) must be connected to

a governed meter.

• Liquid Petroleum Gas (LPG) must be connected to a

regulator.

• Installation and connection of the gas supply to the

boiler must be in accordance with BS6891.

• Under no circumstance should be size of the gas

supply pipe be less than 22 mm.

• The meter or regulator and pipe work to the meter

must be checked, preferably by the gas supplier.

This is to ensure that the equipment is in good

working order and can meet the gas flow and

pressure requirements, in addition to the demand

from any other appliance being served.

NOTICE: All the following Pre-Installation

sections must be read and requirements

met before starting boiler or flue

installations.

CAUTION: Isolate the mains supplies before

starting any work and observe all relevant

safety precautions.

NOTICE: Debris from the system can

damage the boiler and reduce efficiency.

Failure to comply with the guidelines for the

use of water treatment with the appliance

will invalidate the appliance warranty.

NOTICE: Artifically softened water must not

be used to fill the central heating system.

WARNING: Sealing agents

B The addition of sealing agents to the

system water is not permitted as this can

cause problems with deposits left in the

heat exchanger.

WARNING: GAS SUPPLY PIPE SIZING

18Ri & 24Ri models

B Under no circumstances should the size

of the gas supply pipe be less than 22mm.

NOTICE: 12Ri & 15Ri models

B Provided that the correct gas supply

working pressure and gas rate can be

achieved (see technical data on page 7,

Check gas inlet pressure on page 39, also

refer to B.S. 6891)

B Then it may be possible to reduce the gas

supply pipe diameter to 15mm.

B Generally the appliance would need to be

within 3 to 4 metres of the gas meter.

However, this will depend upon the

distribution pipe size and route.

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Worcester Greenstar Ri Manuel de service Page 9

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