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7.3.2.
Heating And Hot Water Connections
7.3.2.1.
Cold & Hot Water Connections.
The cold water inlet and hot water outlet connections are
1/2" male thread connections. Use 2 x 1/2" female to 15mm pipe adapters with an isolation valve
fitted to the cold supply connection. Make sure that the pressure of the mains water does not
exceed 6 Bar. If the Mains Water pressure is more than 6 Bar a pressure reduction valve must be
fitted. The minimum required pressure is 0,8 Bar. For hard water areas a water softener must be
used.
Salt softeners must not be used to fill the heating system.
Note: Set the correct flow rate
for the boiler output. If the flow rate is set too high, the Hot Water outlet temperature will not
be achieved
.
7.3.2.2.
Flow & Return Connections.
Flow & Return connections are G 3/4" male thread. Use 2 x
3/4" female to 22mm pipe adapters along with 2 x full bore isolation valves to provide good
system circulation. The use of flexi hoses is preferred as overtightening of connections can twist
and damage the internal pipework of the boiler (which is not covered under the warranty). An
external magnetic filter must be used on all installations.
7.3.2.3.
PRV.
The boilers are fitted with a pressure relief valve. This has a barbed fitting for
temporary applications. For permanent applications this can be removed, and we recommend
fitting a ½” female connection to a 15mm copper pipe which should be discharged as per current
building regulations. The PRV should never be used as a drain point as this could cause the device
to leak.
7.3.2.4.
Automatic Bypass Valve
An automatic bypass valve MUST be installed as part of this
installation. The ABV should be fitted to begin opening immediately the first radiator, valve or
actuator shuts in the system. This stops excess pressure from building in the system on the flow
side. Failure to fit and set the ABV can result in poor performance and premature boiler failure.
7.3.2.5.
Insulation
. We recommend that all pipework is insulated where practical. Especially the
primary pipework within a boiler cupboard. This will reduce heat loss and protect the cupboard
from high temperatures.
