Multiply 150 (water content litres) x 0.11
(factor from chart) = 16.5 litres.
Vessel required 16.5 litres.
Vessel supplied 10 litres.
Vessel inadequate.
Additional vessel 6.5 litres required.
When system content unknown or difficult to
determine the following table can assist with
calculating water content.
T
T
a
a
b
b
l
l
e
e
1
1
1
1
S
S
y
y
s
s
t
t
e
e
m
m
C
C
o
o
n
n
t
t
e
e
n
n
t
t
s
s
Approx. Litres per
kW
New Radiators 9
Old Radiators
13
U/Floor
Heating
22
Expansion vessels should be connected to
the system at a point close to the pump inlet
in order to maintain positive pressure
throughout the system.
The central heating system should be in
accordance with the recommendations
given in BS. 6798 and BS. 5449.
20.2
Hydraulic Resistance
The integral boiler pump is designed to
provide an adequate flow rate through the
boiler at all times. Therefore, if an
additional duty pump is to be fitted to the
system, the boiler resistance can be
ignored.
A PRO1 pump control box is available from
eco hometec. When connected directly to
the boiler control panel it will control
external duty pumps via the boiler. This
feature maintains the built in summer and
winter pump protection.
20.3
Condensate Drain
The condense discharge pipe should
be continued in ¾ inch
plastic waste pipe
into the household drainage system or out
through the wall to an existing gully or soak
away. To minimise the risk of freezing all
condensate waste pipe-work fitted
externally should be 32mm. (The existing
drainage system should be corrosion
resistant).
In order to avoid damage to the
boiler caused by a blocked drainage
system, the condense disposal pipe should
include a tundish
. In these cases the
pipe-work connected to the internal
household drainage system should be fitted
with a deep seal running trap.
Horizontal runs of condense
discharge pipe must fall at a rate of 40mm
per metre and any external sections of pipe
must be protected against the risk of
freezing. Due care should be taken when
installing the condensate disposal system to
minimise the risk of blockage, as this would
cause the condensate to back up inside the
boiler.
eco hometec will not accept any liability for
damage caused to the boiler should this
situation occur.
If the connection to an existing drain is not
possible, the condensate may be
discharged in to a purpose-built soak away.
For further information regarding the
construction of a soak away, please contact
the eco hometec Technical Support
Department.
When the boiler is installed below ground
level, i.e. a basement or cellar,
(NB the
appliance must not be installed below
ground when using LPG)
provision should
be made for the disposal of the condensate
via a sump pump arrangement.
20.4
System By-Pass
The boiler incorporates a bypass making it
unnecessary to fit a system bypass.
Please contact eco hometec Technical
Department for more information if required.
Page 30
eco hometec (uk) ltd.
