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11.2
ARC WELDING PRECAUTIONS
The appliance must be isolated from the mains electricity supply in the event of electric arc welding being carried
out on any connecting pipework.
11.3
ANCILLARY EQUIPMENT
11.3.1
OUTSIDE TEMPERATURE SENSOR
When an outside temperature sensor is fitted to compensate the flow temperature of the boiler, it should be
located in an area where it is not influenced by other heat sources i.e. out of direct sunlight (ideally on a north
facing wall) and away from flue terminals and heat extract fans.
11.3.2
SAFETY CIRCUIT
Where additional safety devices are used such as emergency stop controls, system pressurisation units and fire
control systems, the safety circuits should be linked in series and connected to terminals '7' & '8' on the
connection strip. This will ensure that the appliance does not fire in an unsafe situation but maintains all of its
protection features such as combustion post-purge and pump over-run.
11.4
CASCADE CONTROL
11.4.1
CASCADE WIRING
If the heaters are to be operated in a cascade, shielded 2-wire twisted pair communication cable should be used.
The shielding should be connected to a suitable earth point and then all "17" terminals should be linked together
and all "18" terminals should be linked together.
11.4.2
CASCADE SENSOR
A strap-on pipe sensor is required for the cascade control to function correctly. This should be located as close to
the low velocity header as practicably possible on the system flow pipework.
11.5
TIME, TEMPERATURE AND ZONE CONTROL
Lochinvar can supply time, temperature and zone control options for a variety of heating system installations. For
further details, please refer to the Systems and Controls Guide, available from www.lochinvar.ltd.uk.
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