BOILER MODEL
DHW MODEL
13
REGULATIONS
The plumbing must be in accordance with all
relevant regulations and practices. It must include a
gravity circuit with expansion pipe, open to the
atmosphere. The central heating will normally be
pump-driven as with other types of boilers.
PLUMBING (BOILER MODEL)
GRAVITY CIRCUIT
The gravity circuit consists of the domestic hot water
tank of 135 litres indirect cylinder, fixed in an upright
position, recommended for hot water storage and it
should be connected to the boiler by 28mm diame-
ter flow and return piping. The pipes should not
exceed 7.8 meters (25ft) in length and cylinder and
pipework should be fully lagged. The shorter the run
of pipe work the more effective the water heating.
Fig. 9
Fig. 10
PIPE THERMOSTAT
The fitting of a pipe thermostat to the flow pipe is
essential in order to activate the water circulation
pump when the water reaches the selected
temperature.
When the water temperature falls below the select-
ed temperature the pipe thermostat will cut off the
water circulation pump in order to allow the boiler to
recover.
Fig.12
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