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UK INST. INSTRUCTIONS - CONNECTIONS
Water Connection.
For all closed systems (with flow and return or tank) the system must incorporate an un-
vented kit with the components shown below. The safety relieve valve must discharge
safely into a suitable drain via tundish.
Gas Connection
Refer to BS6891 (Natural Gas) and BS5482 (Propane) for guidance on correct pipe sizing
calculation. There must be 20 mbar Natural Gas (G20) or 34.5 mbar Propane (G31) at the
inlet of the appliance with all appliances at high fire.
Electrical Connection
The heater electrical supply must be installed to the latest I.E.E regulations. If the unit is
hard wired (moulded plug removed) it must be provided with a fused (3A) local isolator with a
contact separation of 3mm minimum on all poles for servicing. Observe polarity and ensure
that wiring is correctly restrained.
Isolation
Valve
Y- Strainer
Pressure
Reducing
Valve with
Gauge
Double
Check
Valve
Expansion
Vessel
Safety
Relief
Valve
Tundish
Mains