General information
Handling
Offloading, dry storing and placing of equipment in the
boiler room is the responsibility of the installer.
Equipment must be dry stored and protected from frost.
Cartons must not be crushed or otherwise damaged.
Commissioning
Clyde undertake commissioning of boilers. Commissioning
charges do not include servicing during the guarantee
period, although this may be carried out under service
contract or to specific order. Boilers should be
commissioned in line with CIBSE Commissioning Code B.
Servicing
The importance of regular maintenance cannot be over-
emphasised if maximum efficiency is to be maintained.
Customers are strongly advised to place the equipment
under service contract immediately commissioning is
complete.
Application
CG boilers are manufactured and tested in accordance with the Gas Appliances Directive 90/396/EEC, the Boiler
Efficiency Directive 92/42/EEC, EN 483 and EN 677 and CE marked accordingly. They are suitable for use in LTHW
heating systems with a maximum operating pressure of 6.0 bar and a maximum working temperature of 90°C (see
Technical data).
CG 60, 80, 100 and 120 boilers are suitable for use with Natural gas (G20), Propane (G31) and Butane/Propane mix
(G30). CG 150 and 180 boilers are only suitable for use with Natural gas (G20).
The boiler is suitable for use in pressurised (sealed) or open vented heating systems with a minimum static head of 0.5
bar. It is not suitable for use as a direct water heater. Where potable water is required, a matching calorifier or plate heat
exchanger must be provided in the system. All models in the range are suitable for use with a concentric balanced flue.
Statutory requirements
The installation and commissioning of the boiler must be carried out by a qualified engineer in accordance with the
instructions provided.
Gas supplies and gas burners must be installed, serviced and commissioned by a qualified person, eg. a Gas Safe
registered engineer.
Guarantee
Subject to correct handling, installation and operation, all
equipment is guaranteed for twelve months from the date
of despatch. Boiler heat exchangers are guaranteed for a
period of two years from the date of manufacture.
The guarantee is not valid if the boiler is not installed in
accordance with these instructions (please refer to page
5), becomes blocked with debris and/or carbonate
deposits from the system water and/or there is no
documented evidence of commissioning by Clyde or their
appointed engineer.
Boiler Log book
A boiler log book that provides a permanent record of
commissioning and servicing data and measurements is
supplied with every boiler. It is recommended that the
owner ensures that this log book is kept safe and brought
up to date on every occasion that routine or emergency
work is carried out on the boiler.
Emitter sizing (radiators)
The boiler will operate in condensing mode whenever the
return water is below 50°C and will reach its full potential if
the flow water temperature is also below 50°C. However,
the latter condition will mainly occur when the boiler is
heating an underfloor heating scheme or transiently when
recharging a DHW storage tank from cold. By careful
design of a traditional heating system with radiators, and
with weather compensating control in operation, the return
water temperature can be held below 50°C for most of the
heating season, only rising above this figure when outdoor
temperatures are below zero.
For optimum performance, calculate heat losses on the
basis of a 20°C internal temperature and a -8°C outdoor air
temperature. With no added factors, size the radiators on
the basis of published EN 442 data (
T50) and size the
system pump for a 10°C temperature drop. In most cases
this will ensure that the boiler begins to operate in
condensing mode when the outdoor air temperature rises
above 1°C and becomes fully condensing when the
temperature is above 5°C. For heating schemes in
buildings where the occupants have special needs,
different environmental conditions may apply and further
advice must be sought.
Non-condensing
0
10 15
20
5
-5
-8
Outdoor air temperature °C
20
30
40
50
60
70
80
Condensing
°C
Boiler °C
Return water temperature °C
Flow water temperature °C
EDS769/4 page3
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