Olympic 20/35F User manual

307C648 Iss. 04
INSTALLATION
Olympic 20/35F and 38/50F
Wall mounted gas boilers
G.C. Appliance No’s.
Olympic 20/35F 41 789 65
Olympic 38/50F 41 789 66
For use with Natural Gas only.
Leave these instructions adjacent to the gas meter
Read these instructions thoroughly before installing the boiler.
General
These fanned draught balanced flue wall mounted boilers are for use on
natural gas only, and are suitable for rear or side exit flue.
The Olympic 38/50F is range rated from 11.14 to 14.65 kW (38 000 to 50 000
Btu/h).
The Olympic 20/35F is range rated from 5.86 to 10.26 kW (20 000 to 35 000
Btu/h).
The boiler must be installed in accordance with:
The Gas Safety Regulations 1972.
The Gas Safety (Installation and Use) Regulations 1984. Local Building
Regulations.
By-Laws of the local Water Undertaking.
I.E.E. Wiring Regulations.
Detailed recommendations are stated in the following British Standard Codes
of Practice: CP331:3:1974,
BS5376:2:1976, BS5546:1979, BS5440:1 :1978, BS5440:2:1976 and
BS5449:1:1977.
Note: Gas Safety Regulations: It is the law that all gas appliances are
installed by competent persons, in accordance with the above regulations.
Failure to install appliances correctly could lead to prosecution. It is in your
own interest, and that of safety to ensure that the law is complied with.
Delivery

The unit is delivered in two packages (1) the cased boiler and (2) the flue
terminal assembly. The same flue terminal assembly is used for both sizes of
boiler. If required, extended flue tubes 1500 mm (59 in) long are available. A
plug-in programmer kit is also available to fit inside the boiler casing. This
programmer simplifies wiring and is suitable for use with all external control
systems shown in this instruction.
Gas supply
The 38/5OF requires 1.84 m
3
/h (66 ft
3
/h) of natural gas, the 20/35F requires
1.28 m
3/
h (46 ft
3
/h). The meter and supply pipes must be capable of delivering
this quantity of gas in addition to the demand from any other appliances in the
house.
The complete installation must be tested for gas soundness and purged as
described in CP331:3.
Electricity supply
240V 50Hz via a fused double pole switch with a contact separation of at least
3 mm in both poles or preferably a fused 3-pin plug and shuttered outlet
socket, adjacent to the boiler.
Fuse the supply at 3 amp.
Mains cable: 0.75 mm
2
(24 x 0.20 mm).
The external wiring between the appliance and the electrical supply shall
comply with the latest lEE Wiring Regulations, and any local regulations which
apply.
The appliance must be earthed.
In the event of an electrical fault after installation of the appliance, preliminary
electrical systems checks can be carried out as described in the British Gas
multimeter instruction book.
Air supply
1. The room in which the boiler is installed does not
require a purpose provided air vent.
2. If the boiler is installed in a cupboard or compartment,
permanent air vents are required in the cupboard or compartment, one at high
level and one at low level, either direct to the outside air or to a room. Both
high and low level air vents must communicate with the same room or must
both be on the same wall to outside air. Both the high level and low level
vents must have a free area of 180 cm
2
(28 in
2
) for the 38/5OF and 123 cm
2

(19 in
2
) for the 20/35F boiler. The free area of each vent may be halved if the
ventilation is provided directly from outside.
Flue system
The boiler must be installed so that the terminal is exposed to the external air.
It is important that the position of the terminal allows the free passage of air
across it at all times. The minimum acceptable spacings from the terminal to
obstructions, corners and ventilation openings are specified in the chart
below.
*If the terminal is fitted within 850 mm (34 in) of a plastic or painted gutter/pipe
or 450 mm (18 in) of painted eaves, an aluminium shield of at least 750 mm
(30 in) in length should be fitted to the underside of the gutter/pipe or painted
surface.
† If the terminal is fitted less than 2 m (6.6 ft) above a balcony, above ground
or above a flat roof to which people have access then a suitable terminal
guard must be provided.
A type K2 protective guard is available from Tower Flue Components Ltd at:
Vale Rise
Tonbridge
Kent
TN9 1TB
Tel: [phone]
Page 1
The flue tube assembly and terminal of the boiler must not be closer than 50
mm (2 in) to combustible material. When using side exit flue the flue tubes
must be protected if they are accessible to the User. Detailed
recommendations on protection of combustible materials and exposed flue
protection are given in BS5440:1:1978, sub-clause 20-1.

Installation
The boiler must be mounted on a flat wall which is sufficiently robust to take
the weight of the boiler. If the wall is of combustible material it must be
protected by a sheet of non-combustible material of thickness not less than 25
mm (1 in).
Note: If the boiler is to be fitted into a house of timber frame construction,
advice is available from your trade organisation or local Gas Region.
The boiler is designed for use with an open vented central heating system
and/or indirect domestic hot water system. IT MUST NOT BE CONNECTED
TO A DIRECT CYLINDER.
The boiler may be installed in any room, although particular attention is drawn
to the requirements of the latest I.E.E. Wiring Regulations and, in Scotland,
the electrical provisions of the building regulations applicable in Scotland, with
respect to the installation of the boiler in a room containing a bath or a
shower.
Where the installation of the boiler will be in an unusual position, special
procedures may be necessary and BS5376:2 and BS5546 give detailed
guidance on this aspect.
A cupboard or compartment used to enclose the boiler must be designed and
constructed specifically for this purpose. An existing cupboard or
compartment may be used provided that it is modified for the purpose.
Details of essential features of cupboard/compartment design including airing
cupboard installations are given in BS5376:2 and BS5546.
Boiler dimensions, minimum clearances and connection details are shown in
frames 1, 12 and18:
Fit one or more drain cocks to enable the water system to be fully drained.
Note: THE PUMP MUST BE WIRED BACK TO THE BOILER, see wiring
diagrams, frames 46 and 47. For low head system see frame45.
Data
Heat inputs and outputs together with burner setting pressures are given in
frame 42.

Head loss given is applicable only when the heating return is connected to
the ¾ in connection under the boiler, and the temperature rise across the
boiler is 11ºC
(20º F).
In the event of any fault occurring during the commissioning of the boiler a
fault finding guide is available in the maintenance instructions.
Page 2

Page 10
WARNING
IT IS IMPERATIVE FOR COMPLETE
SAFETY OF OPERATION THAT THE
OUTER CASE IS PROPERLY FITTED.
CHECK THAT THE FOUR CASE FIXING
SCREWS ARE TIGHTENED SUFFICIENT
TO COMPRESS THE SEALING GASKET.
DO NOT RUN THE BOILER WITH THE
CASE REMOVED.
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