7
INSTALLATION INSTRUCTIONS
2. INTRODUCTION
The Contractor WM70 HE has been designed to conform to
European Directive/Standards BED 92/42 EEC LVD EN 73/23
EEC EMC 89/336/EEC.
The matched pressure-jet burner is exceptionally quiet in
operation and ensures clean and efficient combustion, with low
NOx emissions.
The boiler is designed for sealed systems up to a working
pressure of 3 bar, with the appropriate sealed system safety
equipment.
To ensure that the boiler is operating at maximum efficiency,
the central heating return temperature should be 50°C or
above. Maximum performance will be achieved by maintaining
a differential of 20°-30°C between the flow and return water
temperatures.
This appliance is suitable for sealed, fully pumped systems
only.
Routine servicing can be carried out from the front of the boiler.
The boiler is fully automatic in operation and incorporates all
necessary safety controls to ensure safe and reliable running.
The boiler is supplied with the burner set for 28 sec. Kerosene
Class C2 to BS 2869 fuel to meet the Building Regulation
requirements for low-level flue discharge.
BALANCED FLUE KITS
The boiler is supplied equipped for connection to a Trianco
balanced flue kit (sold separately). These kits allow the boiler
to be installed in a wide variety of site conditions, from low-
level discharge through the wall, to high-level and vertical
discharge (see
page 19
onwards for details).
The flue kit is available in low-level horizontal, vertical and high
level horizontal formats.
As a balanced flue boiler, the Contractor WM70 HE is a room-
sealed appliance which conforms to the requirements specified
in OFSA100. All flue types are suitable for installation in a
garage.
FLUSHING AND WATER TREATMENT
The performance of the appliance could be impaired by system
debris or the effects of corrosion. New systems must be
thoroughly flushed to remove metal filings, solder, machining
oils and any other fluxes or greases before connecting the
boiler.
When fitting the appliance to an existing system, it is advisable
to clean the system by using an appropriate flushing and
descaling agent. Refer to BS 7593 [1992] for guidance.
System additives - corrosion inhibitors and all flushing
agents/descalers should be suitable for steel boilers and
comply with BS 7593 requirements. It is strongly
recommended that a suitable anti-freeze product is applied to
the system after flushing.
Always refer to manufacturers' instructions.
Failure to flush and add inhibitors to the system will
invalidate the appliance warranty.
The appliance is designed to be fitted to fully-pumped
systems only. Failure to do so will invalidate the warranty.
The boiler must not be run without water in the system.
IMPORTANT NOTICE:
To comply with regulations in force, the boiler must be installed and commissioned by an
OFTEC
-registered engineer. The
installation must comply with all requirements of current
Building Regulations, Part L.
Failure to meet the terms of these requirements may invalidate the guarantee.
THE PERSON(S) WHO INSTALLS THIS APPLIANCE, SERVICES OF CARRIES OUT ANY REMEDIAL WORK, i.e. ELECTRICAL
FAULT-FINDING, MUST HAVE THE SUITABLE ENGINEERING QUALIFICATIONS.