Thermaflow TH12 - Draining; Domestic Hot Water System; General; Water Pressure

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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 two drain taps fitted to it one for primary and one for
secondary.
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 400 KPA (4 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 @ 40ºC ∆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 is fitted in the cold water supply to the boiler. Consult the local water authority for additional
advice.
A double check valve assembly must be fitted upstream of the scale reducer, for the relative position of
the scale reducer and pressure reducing valve, if required, refer to the manufacturers 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.
2.5.2 Safety valve discharge
It must not discharge above an entrance or window or any type of public access.
The position of the Tundish (if required when the pressure relief pipe is not visible to
atmosphere) shall be visible to the occupants and shall be positioned away from any electrical
devices.