Technical data

2
CONTENTS
7 Installation ......................................................... 6
8 Commissioning.................................................. 6
9 Inspection and Service ...................................... 7
10 Replacement of parts ........................................ 8
11 Spare parts ...................................................... 10
12 Fault Finding.....................................................11
1 Installation Regulations...................................... 2
2 General information ........................................... 2
3 Technical Data ................................................... 5
4 Siting the appliance ........................................... 5
5 Air supply........................................................... 5
6 Gas supply ........................................................ 6
2.3 This appliance is not suitable for external installation.
2.4 The appliance is set to provide a maximum output
of 8.7 kW and a minimum output of 4.4 kW.
2.5 The appliance has a permanent pilot.
2.6 PRINCIPLE APPLIANCE COMPONENTS
- A low thermal capacity Gas to Water heat exchanger.
- A stainless steel main gas burner.
- A gas section.
- A water section.
- A thermoelectric safety valve.
2.7 GENERAL INSTALLATION
The appliance must be installed in the same room as the
water draw-off point.
The appliance must not be installed in a room where the
volume is less that 5m
3
.
The appliance must not be installed in a compartment or
roof-space or in a room which may be incorporated in a
protected shaft / stairway.
2.8 FLUE
This appliance is flueless, hence it is essential that the
correct installation requirements are satisfied. This
appliance is intended for intermittent use only, and must
not be positioned in or adjacent to a bedroom or any room
containing a bath or a shower.
2.9 SAFETY FEATURES
The Worcester W 125 is fitted with an atmosphere-Sensing
Device which must not be altered in any way.
1.) If the air in the room in which the heater is situated
becomes depleted of oxygen the pilot will be extinguished
automatically.
2.) If the flue outlet is obscured or the heat exchanger
becomes blocked again the pilot will be extinguished
automatically.
1 Installation Regulations
1.1 Gas Safety (Installation and Use) Regulations 1998.
All gas appliances must be installed by a competent person
in accordance with the above regulations. Failure to install
appliances correctly could lead to prosecution.
1.2 The manufacturers notes must not be taken, in any
way, as overriding statutory obligations.
1.3 The compliance with a British Standard does not,
of itself, confer immunity from legal obligations. In particular
the installation of this appliance must be in accordance
with the relevant requirements of the Gas Safety
(Installation and Use) Regulations 1998 (as amended),
local Building Regulations, Building Standards (Scotland)
(Consolidation), byelaws of the local Water Company and
Health and Safety Document No. 635 (Electricity at Work
Regulations 1989). It should be in accordance with the
relevant recommendations of the following British
Standards:
BS 6798:1987 Specification for Installation of gas fired
hot water boilers of rated input not exceeding 60 kW.
BS 5546:1990 Installation of gas hot water supplies for
domestic purposes.
BS 5440:2:1989 Flues and ventilation for gas appliances
of rated input not exceeding 60 kW: Air Supply.
BS 6891:1988 Installation of low pressure gas pipework
installations up to 28 mm (R1).
1.4 To ensure that the installation will perform to the
highest standards, the system and components should
conform to any other relevant British Standards in addition
to those mentioned in the instructions.
2 General Information
2.1 This appliance is available for use with natural gas.
When installing the appliance for use with natural gas,
please check 10 digit number on carton to ensure that the
correct appliance has been specified. The 10 digit number
for a natural gas appliance is 7 700 352 952.
2.2 This appliance is available for use with LPG.
When installing the appliance for use with LPG, please
check 10 digit number on carton to ensure that the correct
appliance has been specified. The 10 digit number for an
LPG appliance is 7 700 452 908.
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