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Contents
1. Installation Regulations .............................................. Page 2
2.
General Information .................................................... Page 2
3.
Technical Data .............................................................. Page 4
4.
Siting the Appliance .................................................... Page 6
5.
Siting the Flue Terminal .............................................. Page 7
6.
Air Supply .................................................................... Page 7
7.
Sealed Primary Systems ............................................ Page 8
8.
Gas Supply.................................................................... Page 8
9.
Open Vent Primary Systems ...................................... Page 9
10. Domestic Hot Water .................................................... Page 9
1. Installation Regulations
1.1 Gas Safety (Installation & Use) Regulations 1998: It is the law
that all gas appliances are installed by a competent person in
accordance with the above regulations. 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, of itself, confer immunity from legal obligations.
1.4 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 bye-laws.
1.5 The installation should follow the recommendations of the
following British Standards unless otherwise indicated:
BS6798 - Specification for the installation of gas fired hot water
boilers of rated input not exceeding 60kW (Gross).
BS5449 - Central heating for domestic premises.
BS5546:1 - Installation of gas hot water supplies for domestic purposes.
BS5440/1 - Flues and ventilation for gas appliances of rated input
not exceeding 60kW (Gross): Flues.
BS5440/2 - Flues and ventilation for gas appliances of rated input
not greater than 60kW (Gross): Air supply.
BS 5482 - Domestic butane and propane gas burning installations -
permanent dwellings.
BS6891 - Installation of low pressure gas pipework installations up
to 28mm (R1).
BS6700 - Domestic water supply in buildings.
BS7593 - Water treatment in domestic heating systems.
1.6. To ensure that the installation will perform to the highest
standards, the system and components should conform to any
other relevant standards.
1.7. The appliance and/or components conform, where
applicable, with the Essential Requirements of the Gas Appliance
Directive, the Boiler Efficiency Directive, the EMC Directive and the
Low Voltage Directive.
1.8. In accordance with the requirements of COSSH the appliance
does not contain any substances which are harmful to health.
1.9. Product Liability regulations indicate that, 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 are used.
1.10. 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.
1.11. The advice and instructions given in this document covers, as
far as possible, the foreseeable situations which may arise. Contact
Worcester Heat Systems Technical Department, Telephone: 08705
266241, for advice on specific installations.
11.
Electrical ...................................................................... Page 10
12.
Installation.................................................................... Page 13
13.
Commissioning ............................................................ Page 17
14.
Instructions to the User .............................................. Page 19
15.
Inspection and Servicing ............................................ Page 20
16.
Replacement of Parts .................................................. Page 21
17.
Short Parts List ............................................................ Page 27
18.
Operational Flow Diagrams........................................ Page 29
19.
Fault Finding ................................................................ Page 31
20.
Conversion Instructions.............................................. Page 39
2. General Information
2.1. General Information
2.1.1. The appliance is set to provide the maximum output for
domestic hot water and a central heating load of 24kW
(24/28CDi) or 27.5kW (35CDi II). The hot water flow rate is
limited to a nominal 9 l/min (24CDi) or 10 l/min (28CDi) or 12
l/min (35CDi II) at a maximum temperature rise of 40°C.
2.1.2. The sanitary water section of the appliance is suitable for
water mains pressures of up to 10bar.
2.1.3. Conversion kits are available to convert the appliance
from Natural Gas to Propane operation and vice versa. The kits
include conversion instructions.
2.2 Electrical Supply
Mains supply: 230V ~ 50 Hz. 180Watts.
External fuse: 3A (BS 1362). Internal fuses: T 2A (F1), and T 1.25A (F2).
2.3 Gas Supply
Check the data plate (located on the inner cover of the appliance)
to ensure the appliance has been set up for the correct gas
supply. The appliance can be set up for either of the following
gases: Natural gas (G20) or Propane (G31). A conversion kit
including instructions is available to change the appliance
from one gas to the other.
The boilers require a gas flow in m
24CDi
28CDi
35CDi II
The meter governor or regulator should deliver a dynamic
pressure of 20mbar for natural gas or 37mbar for propane at the
appliance, which is about 18.5mb or
35.5 mbar at gas valve inlet pressure test point.
The complete installation, including the gas meter (G20), must be
tested for soundness and purged. Refer to BS 6891.
2.4 Packing
The appliance and flue components are packed in separate cartons.
2.5 Installation
The appliance is suitable for indoor installations only.
A wall-spacing frame to allow pipe runs behind the appliance is available.
An inlet water filter is fitted to the mains cold water inlet on the appliance.
The appliance is fitted with a system filling link assembly. See Page 8.
The appliance is suitable for connection to a sealed or open
vented primary system (35CDi II SEALED SYSTEM ONLY).
Any specified ventilation openings made into a wall or
compartment door must not be obstructed.
If the appliance is to be fitted into a compartment then the
compartment must conform to the requirements of BS 5440:2.
Notwithstanding the instructions given in BS 5440:2, this appliance
may be fitted in a compartment with no vents as long as the
minimum clearances stated in Section 6: Air Supply, are maintained.
Do not place anything on top of the appliance.
2
3
/h of:
NG (G20)
LPG (G31)
2.9
1.13
3.3
1.3
4.16
1.6
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