Saunier Duval SYLVA FF 24 E Installation And Operating Instructions Manual page 9

PIPING SYSTEM INSTALLATION
Tundish discharge
The SYLVA is delivered with the tundish fitted to the
boiler but must be piped to a suitable position
outside the building in accordance with Building
Regulations.
It is permissible to use copper or an appropriate
temperature resistant plastic pipe, such as HEP
for this, see diagram 6.
WARNING. It must not discharge above an
entrance or window or any type of public access
area.
Connect the safety valve discharge pipe to the
boiler, the discharge must be extended using not
Sizing of tundish discharge pipework D2
Minimum size of
Valve outlet size
discharge to
G 1/2
G 3/4
G 1
Boiler
Tundish
(supplied)
Additional
expansion
vessel
(if required)
Return
Heating
Bypass
circuit
Flow
control valve
Diagram 6
O
2
Minimum size of
discharge pipe
tundish D2 from tundish
15 mm 22mm
28 mm
35 mm
22 mm 28 mm
35 mm
42 mm
28 mm 35 mm
42 mm
54 mm
Pressure
reducing
valve
(supplied)
Minimum 22 mm diameter
Hot
Filling point
Drain point
less than 15 m o.d. pipe, to discharge in a visible
position outside the building, facing downward
preferably over a drain. The pipe must have a
continuous fall and be routed to a position so that
any discharge of water, possibly boiling or steam,
cannot create any danger to persons, damage
to property or external electrical components and
wiring. Tighten all pipe connection joints.
The tundish outlet pipe must have a vertical section
of at least 300 mm before any bends or elbows in
the pipework.
Maximum resistance
allowed expressed as
a length of straight
pipe i.e. no elbows or
bends
up to 9 m
up to 18 m
up to 27 m
up to 9 m
up to 18 m
up to 27 m
up to 9 m
up to 18 m
up to 27 m
Safety device e.g. Discharge pipe (D1) from
temperature relief valve temperature relief valve to tundish
500 mm max.
Tundish
Discharge pipe (D2) from
tundish with continuous fall see
table on left for size examples
Resistance
created by each
elbow or bend
0.8 m
1.0 m
1.4 m
1.0 m
1.4 m
1.7 m
1.4 m
1.7 m
2.3 m


Fixed grating
Trapped
gully
9