2.4.2 BLOWDOWN VALVES
There are three blowdown connections on the boiler, the boiler blowdown valve at the rear of the
boiler, the water level gauge (sight glass) blowdown valve and the TDS blowdown connection.
Each connection must be connected to a blowdown receptacle of approved design. Regulations
exist covering such items and care must be taken to ensure compliance with these regulations.
If in doubt regarding blowdown arrangements, consult Fulton Ltd or CEA Guidance Note
Document BG03, which covers blowdown vessels and associated systems.
!
WARNING
Never discharge blowdown from the boiler directly to a drain. Where a high level of blowdown or automatic
blowdown systems are installed, serious consideration should be given to fitting a Blowdown after cooling
system to meet planning regulation and approval--i.e., requirement for 43.7°C maximum water temperature to
drain
2.4.2.1 WATER LEVEL GAUGE (SIGHT GLASS)
Boilers are normally supplied with a water level gauge (sight glass). The water level gauge
blowdown cock should be connected to the blowdown line by 12 mm soft copper tubing.
!
WARNING
Improper installation or maintenance of the water level gauge assembly can cause immediate or
delayed breakage resulting in bodily injury and/or property damage.
2.4.3 STEAM SAFETY VALVE
!
WARNING
Factory fitted safety valves are pre-set to protect the boiler only and must not be used to protect any
other items not capable of accepting boiler pressure.
Safety valves are factory fitted and pre-set, they MUST NOT be adjusted. The discharge outlet
should be piped to a safe discharge point and the piping so arranged that any condensate
trapped in the pipework will drain away from the valve. A maximum 12mm drain pipe is
recommended at the lowest point of discharge.
Note: It is recommended that the safety valve discharge pipework is installed to the requirements of BSEN
13480-1:2012
a)
The lift pressure is indicated on the safety valve (do not adjust).
b)
The safety valve fitted to the boiler is designed to prevent the boiler exceeding its
design
pressure.
c)
Any system connected to the boiler not capable of accepting boiler pressure must be
protected by a suitably specified Pressure Reducing Valve (PRV) and safety valve set to the
required downstream pressure.
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