Worcester Greenstar 21i System ErP User Manual

UK/IE
User instructions
Wall hung RSF gas fired condensing system boiler
Greenstar i System
ErP
6720806946-00.1Wo
For sealed central heating systems
6 720 806 947 (2015/03)
If you smell gas:
▶ Well away from the building: call the National Gas Emergency
Service on 0800 111 999.
▶ L.P.G. boilers: Call the supplier’s number on the side of the
gas tank.
These appliances are for use with:
Natural Gas or L.P.G.
(Cat. II 2H 3P type C13, C33 & C53)
Model GC Number
Natural Gas Greenstar 9i System
ErP
41-406-21
Greenstar 12i System
ErP
41-406-23
Greenstar 15i System
ErP
41-406-25
Greenstar 18i System
ErP
41-406-27
Greenstar 21i System
ErP
41-406-29
Greenstar 24i System
ErP
41-406-31
L.P.G. Greenstar 9i System
ErP
41-406-22
Greenstar 12i System
ErP
41-406-24
Greenstar 15i System
ErP
41-406-26
Greenstar 18i System
ErP
41-406-28
Greenstar 21i System
ErP
41-406-30
Greenstar 24i System
ErP
41-406-32

Worcester Greenstar 21i System ErP Specifications

General

Type	System Boiler
Output Rating	21 kW
Fuel Type	Natural Gas
Mounting	Wall-mounted
ErP Rating	A
NOx Emissions	Class 5
Operating Pressure (Natural Gas)	20 mbar
Water Pressure (Central Heating)	1 - 3 bar
Expansion Vessel Capacity	8 litres
Pump Head	6m
Warranty	5 years
Efficiency	94%
Flue Options	Vertical and Horizontal

Summary

Key Symbols and Safety Instructions

Safety Precautions

Crucial safety advice, including actions to take if gas is smelled.

Controls

Appliance Control Panel Overview

Overview and legend for the appliance control panel and its buttons.

Appliance Display and User Functions

Explains the display screen and user-operated buttons.

Central Heating Temperature Adjustment

How to view and set central heating flow temperatures.

Economic Heating and Frost Protection

Setting economic central heating temp and appliance frost protection.

Cylinder Hot Water Temperature Settings

Adjusting cylinder hot water temp with and without diverter valve kits.

Hot Water Temperature Adjustment

Domestic Hot Water Modes

System Pressure

External Filling Link Operation

Clearances

Maintaining Your Appliance

Fault Finding

Basic Operating Problems and Remedies

Table listing common system problems, their causes, and remedies.

Appliance Alert State and Reset

Explains alert displays, fault codes, and the appliance reset procedure.

Fault or Breakdown

Service and Breakdown Support

Tips on Energy Saving

Heating Economically and Energy Saving Measures

Your Guarantee