Radiant RKA 25, Instruction Manual

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INSTALLATION INSTRUCTIONS
CONDENSING BOILOES WITH STORAGE - TG05A095.A0306
17
3.7 Discharge piping
The discharge pipework from the tundish:
1. Shall fall continuously through its length.
2. Shall be of metal construction
3. Shall not be fitted with any valves or taps.
4. Shall discharge to a safe visible position, e.g. onto the surface of an external wall or into a gulley.
5. Shall have a minimum of 300 mm straight pipework directly from the tundish.
Note : Where persons may come into contact with discharges, a wire or similar guard must be positioned to prevent
contact whilst maintaining visibility.
Refer to Fig 1 for suggested methods of terminating the discharge pipe safely.
Where a single pipe serves a number of discharge, such as in blocks of flats, the number served should be limited
to no more than 6 systems so that any installation can be traced reasonably easily .The single common discharge
pipe should be at least one pipe size larger than the largest individual discharge pipe to be connected.
If the system is installed where discharge from safety devices may not be apparent, i.e. in dwellings occupied by
blind, infirm or disabled people, consideration should be given to the installation of an electronically operated
device to wam when discharge takes place.
HIGH LEVEL DISCHARGE TERMINATION
At high level, discharge onto a roof is acceptable providing the roof is capable of withstanding high temperatures
and there is a distance of 3 metres from any plastic guttering systems that would collect such discharge.
Note: The discharge will consist of scalding water and steam. Asphalt, roofing felt and non-metallic rainwater
goods may be damaged by such discharge.
30
0 m
m
mi
ni
m
um.
Ø 22 m m
T und ish
A ir gap
E nd of pipe to be clearly
visible
M eta l dis cna rge pipe (Ø 22
m m ) from tundish w ith
continu ou s fall
300 m
m
m
in
imu
m.
500 m m m ax.
T em perature/ pressure relie f
valve
M etal d iscna rge pipe from
relief valve to tun dish
T o expansion
relief valve
Ø 15 m m
T und ish
T und ish
Ø 22 m m
30
0 m
m
mi
ni
m
um.
P ipe clo se to w all to allow
w a ter to fa n out safely
Ø 15 m m
Ø 2 2 m m
T und ish
Ø 1 5 m m
3
00 m
m
mi
ni
m
um.
G ro un level
100 m m M ax.
70 m m m in.
LO W LE V E L D IS C H A R G E
T E R M IN A T IO N
T E R M IN A T IO N IN T O A
H O P P E R
H IG H LE V E L D IS C H A R G E
T E R M IN A T IO N
Fig. 1
Fig. 2 Fig. 3