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2.3.9 Draining
A draining tap must be provided at the lowest points of the system, which will allow the entire
system to be drained.
The boiler has a drain tap fitted for draining of the primary circuit.
2.4. Domestic hot water system
2.4.1 General
The domestic hot water service must be in accordance with the rules in force in the countries of
destination.
2.4.2 Water pressure
For the minimum and maximum, working pressures of the domestic hot water circuit of the boiler refer to
(“data” table 1).
If the cold water inlet pressure exceeds 300 KPA (3 bar) a pressure reducing valve must be fitted
to the inlet to the boiler.
2.4.3 HOT WATER FLOW RATE
The boiler is capable of flow rates of
20-30 litres per/min @ 35ºC
∆
t (depending on model)
. Hot water
flow rate and pressure will be determined by the volume and pressure of the incoming cold water supply.
2.4.4 Hard water areas
In areas where the water is “Hard” more than 200 mg / litre, it is recommended that a proprietary
scale reducer or water softener is fitted in the cold water supply to the boiler depending on what
is necessary to prevent lime scale build up in the heat exchangers, pipe-work or valves.
Consult the local water authority for additional advice.
A double check valve assembly must be fitted upstream of the scale reducer or water softener.
For the relative position of the scale reducer or water softener and pressure reducing valve if
required, refer to the Manufacturer’s instructions.
2.5. Installation, PREPARATION [water connections]
2.5.1 Water connections
See General Data Diagram 1.8.1 & table 1.8.1 for pipe work connections
It is recommended to flush out the domestic water and heating system before connecting to the
boiler.
While making the connections, do not subject any of the connections to heat as you may damage
the seals.
