Worcester 28i Junior Especificaciones descargar pdf (Pagina 2)

20. Conversion Instructions

NOMINAL BOILER RATINGS (10 Minutes After Lighting)

BOILER ADJUSTED FOR G20 (Natural Gas)

OUTPUT INPUT (Net) GAS RATE

kW kW m bar. m

8.0 9.5 1.2 1.00

27.5 30.0 14.7 3.17

BOILER ADJUSTED FOR G31 (Propane)

8.0 9.5 3.4 0.39

27.5 30.0 35.3 1.23

Table 1. 28i

BURNER

PRESSURE

NOMINAL BOILER RATINGS (10 Minutes After Lighting)

BOILER ADJUSTED FOR G20 (Natural Gas)

OUTPUT INPUT (Net) GAS RATE

kW kW m bar. m

3.5 9.5 1.4 1.00

23.5 25.9 13.6 2.74

BOILER ADJUSTED FOR G31 (Propane)

7.5 9.5 4.6 0.39

23.5 25.9 35.0 1.06

Table 1. 24i

BURNER

PRESSURE

Natural Gas: Net Input = Gross Input x 0.901 LPG (Propane): Net Input = Gross Input x 0.922

ONLY COMPONENTS SUPPLIED BY WORCESTER HEAT

SYSTEMS SHOULD BE USED

ONLY COMPETENT PERSONNEL SHOULD ATTEMPT THE

CONVERSION

CONVERSION FROM NATURAL GAS TO LPG SHOULD NOT BE

CARRIED OUT ON APPLIANCES INSTALLED IN A ROOM OR

INTERNAL SPACE BELOW GROUND LEVEL

1. Ensure the gas service cock is turned OFF and the electrical

supply is ISOLATED.

2. Refer to the Servicing Instrucions to remove the cabinet front

panel and inner casing.

3. Follow the dismantling instructions to remove the burner.

Refer to Installation and Service Instructions Section: Inspection

and Servicing.

4. Remove the injector and replace with the relevent injector

from the kit. Refer to Installation and Service Instructions

Section: Inspection and Servicing.

5. Remove the nut end cap and bracket at the opposite end of

the burner and insert the gauze from the kit for NG to LPG or

remove it for LPG to NG.

6. Refit the end cap ensuring that the support bracket is in the

correct orientation.

7. Remove the gas valve and replace with the gas valve

supplied in the kit. Refer to Installation and Service Instructions

Section: Replacement of Parts.

8. Re-assemble the burner and inner-casing.

9. Turn on the gas and electricity supplies and follow the

commissioning procedure to confirm gas soundness and correct

boiler operation.

10. Check and adjust the setting pressures to the values in the

table overleaf and adjust if necessary. Refer to Installation and

Service Instructions Section: Replacement of Parts. “To Set the

Burner Pressure”.

11. Refit the plastic sealing cap to the gas valve modulating

valve adjuster and seal with a dab of paint or similar.

12. Turn off the boiler and when cool peel off the arrow from the

data plate on the combustion chamber front panel and re-stick

against the gas type for which the boiler has been converted

and adjusted.

13. Replace the boiler front panel.

The conversion is now complete.

Max

2mm

Allen key

Min

3mm

Allen key

Gas valve

sealing

cap

Burner

pressure

test point

Electrical

connections

modulator

(Blue:Blue)

Clockwise to

increase

Anti-clockwise

to decrease

Slight

movement

only

required

Inlet

pressure

test point

Main gas

valve

connections

QTY DESCRIPTION PART No

1 Conversion Instructions

1 LPG Gas Valve Dungs BM771 sl 040 (for LPG to NG) 8 716 105 654

1 NG Gas Valve Dungs BM771 sl 040 (for NG to LPG) 8 716 105 650

1 Burner gauze 8 716 142 601

1 Fibre washer 8 710 103 043

2 O rings 8 716 140 827

1 Injector 2.7mm 24i LPG 8 716 156 373

1 Injector 2.78mm 28i LPG 8 716 140 209

1 Injector 4.3mm 24i NG 8 716 105 033

1 Injector 4.5mm 28i NG 8 716 140 208

1 Copper washer 8 716 101 994

The appliance is suitable for installation in GB and IE only and

should be installed in accordance with the rules in force.

1.1 Gas Safety (Installation & Use) Regulations 1998:

It is the law in GB that a competent person in accordance with

the above regulations installs all gas appliances.

Failure to install appliances correctly could lead to prosecution.

It is in your interest, and that of safety, to ensure compliance

with the law.

1.2 The manufacturers notes must not be taken, in any way, as

overriding statutory obligations.

1.3 The compliance with a British Standard or European Norm

does not, in itself, confer immunity from legal obligations.

1.4.1 The installation of the appliance must be in accordance

with the relevant requirements of the Gas Safety Regulations,

current IEE Regulations, Building Regulations, Building Standards

(Scotland) and local water by-laws.

1.4.2 In Eire, the installation must be carried out by a competent

person and installed in accordance with IS813, Domestic Gas

Installations (Edition 2), the current Building Regulations and the

electrical installation must follow the ETCI rules.

1.5 The installation should follow the recommendations of the

following British Standards unless otherwise indicated.

BS5440:1 - Flues and ventilation for gas appliances: Flues

BS5440:2 - Flues and ventilation for gas appliances: Air supply.

BS5449 - Central heating for domestic premises.

BS5482 - Domestic propane gas burning installations.

BS5546:1 - Installation of gas hot water supplies.

BS6700 - Domestic water supply in buildings.

BS6798 - Installation of gas fired hot water boilers.

BS6891 - Low pressure gas pipework installations upto 28mm

(R1).

BS7593 - Water treatment.

BS7671 - Requirements for electrical installations (16th Edition).

British Standards and Regulations are not in force in Ireland,

however useful information relating to the hydraulic aspects of

heating systems may be found in IS 813: Annex M and in

BS5546, BS5449, BS7074 and BS7593.

1.6 The appliance and components must conform, where

applicable, to all relevant Directives.

1.7 The appliance does not contain any substances which are

harmful to health.

1.8 In certain circumstances, the installer can be held

responsible, not only for mistakes on his part but also for

damage resulting from the use of faulty materials. We advise

that, to avoid any risk, only quality approved branded fittings

and the specified replacement parts are used.

1.9 LPG Installation:

The appliance shall not be installed in a room or internal space

below ground level when it is intended for use with LPG. This

does not preclude the installation into rooms, which are

basements with respect to one side of the building but open to

the ground on the opposite side.

1.9.1 CARAVAN AND HOLIDAY HOMES

The installation must meet the following standards.

BS5482:2 LPG and EN721 ventilation.

1.9.2 PARK HOMES AND RESIDENTIAL

The installation must meet the following standards.

BS5482:1 LPG and BS3632 ventilation.

1.10 These instructions cover, as far as possible, the foreseeable

situations, which may arise.

Contact Worcester, Bosch Group Technical Department,

Telephone: 08705 266241, for advice on specific installations.

In Eire call 01 494 0099.

2.1 The Benchmark initiative is the new code of

practice to encourage the correct installation, commissioning and

servicing of domestic central heating boilers and system equipment.

The 'Log-book' is a vital document that must be completed

by the installer at the time of installation. It confirms that the

boiler has been installed and commissioned according to the

manufacturers instructions.

A Declaration of Conformity (refer to IS813 Annex D 1) must

be completed by the installer and a copy supplied to the

appliance operator for boilers installed in Eire.

Without the completion of the Log-book and/or Declaration,

manufacturers may refuse to respond to a call-out from a

householder, who will be advised that he or she must call back the

installer, who has not fulfilled his obligations to record the

information required by the initiative.

Service:

To ensure the continued efficient operation of the appliance it must

be checked at regular intervals. The frequency of servicing will

depend upon the particular installation conditions and usage, but

once per year should generally be adequate. The extent of the

service required by the appliance is determined by the operating

condition of the appliance when tested by fully qualified engineers.

Any service work must be carried out by competent registered

(by CORGI in GB) engineers.

2.2 General Information

The appliance is set to give the maximum output of 27.5 kW [28i] or

23.5kW [24i] to the domestic hot water and to the heating system.

The hot water flow rate is limited to a nominal 10 l/min [28i] or 8

l/min [24i] at a maximum temperature rise of 40°C.

The sanitary water section of the appliance is suitable for a mains

water pressure of up to 10bar.

An internal filling loop assembly approved by the WRAS is an

optional extra.

The 28i is only manufactured for use with Natural Gas.

Kits are available for the 24i and 28i appliances to convert from

Natural Gas to LPG operation and vice versa.

1. Installation Regulations

1. Installation Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2 11. Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10

2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2 12. Installing the Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

3. Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5 13. Commissioning the Appliance . . . . . . . . . . . . . . . . . . . . Page 20

4. Siting the Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8 14. Handover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22

5. Flue Terminal Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8 15. Inspection and Service. . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22

6. Air Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9 16. Replacement of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25

7. Sealed System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9 17. Short Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 31

8. Open Vent System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9 18. Operational Flow Diagrams. . . . . . . . . . . . . . . . . . . . . . . Page 33

9. Domestic Hot Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10 19. Fault Finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 35

10. Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10 20. Conversion Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . Page 43

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents

2. Introduction

1 2 3 4 5 6 7 ... 21 22

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Worcester 28i Junior Especificaciones Pagina 2

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