Worcester Gas boiler User Manual

CONTENTS
6 720 645 222a (2012/05)
2
CONTENTS
1 KEY TO SYMBOL AND SAFETY PRECAUTIONS . 3
1.1 Explanation of symbols . . . . . . . . . . . . . . . 3
1.2 Safety precautions . . . . . . . . . . . . . . . . . . 4
2 PLUMBING MANIFOLD . . . . . . . . . . . . . . . . . . . . 6
3 BOILER CONNECTIONS . . . . . . . . . . . . . . . . . . . 7
3.1 Assembly of the internal cylinder return
pipe to the boiler . . . . . . . . . . . . . . . . . . . . 7
3.2 Gas and water connections . . . . . . . . . . . . 8
4 fITTING THE DIVERTER VALVE & CODE PLUG 10
4.1 Fitting the diverter valve motor: . . . . . . . 10
4.2 Access to the code plug . . . . . . . . . . . . . 10
4.3 Fitting the code plug . . . . . . . . . . . . . . . . 11
4.4 Fitting the cylinder temperature sensor . 11
4.5 Diverter valve and sensor connections . . 11
5 ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1 Internal diverter valve with a
vented cylinder . . . . . . . . . . . . . . . . . . . . . 12
5.2 Internal diverter valve with an unvented
cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.3 Position of wired components . . . . . . . . 14
6 PRE-COMMISSIONING CHECKS . . . . . . . . . . . 15
7 BOILER FUNCTION . . . . . . . . . . . . . . . . . . . . . . 16
7.1 Fault finding . . . . . . . . . . . . . . . . . . . . . . 16
7.2 Boiler function . . . . . . . . . . . . . . . . . . . . . 17
7.3 Protection function . . . . . . . . . . . . . . . . . 18

Worcester Gas boiler Specifications

General

Mounting	Wall-mounted
Brand	Worcester Bosch
Boiler Type	Gas
Fuel Type	Natural Gas
Type	Condensing
Efficiency	Up to 94%
Warranty	Up to 10 years
Heat Exchanger	Stainless Steel
Dimensions	Varies by model
Weight	Varies by model
Control Options	Digital, Smart Thermostats