Water Circulation (C.h.) - Biasi BASICA COND User Manual And Installation Instructions

• A WRAS approved dry trap such as the Te-
sla DTUN 1522 is utilised.
• That the condensate is connected down-
stream of the trap as shown in the drawing
and no copper pipe is utilised below this
point.
• That the 32 mm equal T and subsequent
downstream connection waist pipe is HT
certified and capable of handling the poten-
tial short term expected temperature such
as HDPE or polypropylene, consideration
should also be given to the type of stack and
its material in the event of the PRV activat-
ing.
At all times during design and component se-
lection a worst case scenario event should be
considered e.g. a short term exposure of high
flow at high temperature along with normal
running conditions of the corrosive nature of
the condensate.
Connection combined condensate
and PRV discharge.
J
Fig. 5.4
A Boiler
G 15 mm copper PRV discharge pipe work
H WRAS approved dry trap such as the Te-
sla DTUN1522
I 22 mm copper PRV discharge pipe work
J 21.5 mm solvent condensate discharge
pipe work
K High temperature rated equal 32 mm T
with required adapters for condensate and
PRV inlets
L High temperature rated Waist discharge
pipe work with a minimum diameter of 32
mm
GENERAL REQUIREMENTS
A
G
H
I
K
L
5.8

Water circulation (C.H.)

Detailed recommendations are given in BS
6798, BSEN 12828: 2003, BSEN 12831: 2003
& BSEN 14446: 2004; the following notes are
given for general guidance.
For Ireland (IE), refer to I.S.813.2002.
Pipework
Copper tubing to BSEN 1057 is recommended
for water pipes. Jointing should be either with
capillary soldered or with compression fittings.
Where possible pipes should have a gradient
to ensure air is carried naturally to air release
points and water flows naturally to drain taps.
The appliance has a built-in automatic air re-
lease valve, it should be ensured as far as
possible that the appliance heat exchanger is
not a natural collecting point for air.
Except where providing useful heat, pipes
should be insulated to prevent heat loss and
to avoid freezing.
Particular attention should be paid to pipes
passing through ventilated spaces in roofs
and under floors.
By-pass
The appliance includes an automatic by-pass
valve which protects the main heat exchanger
in case of reduced or interrupted water cir-
culation through the heating system due to
the closing of thermostatic valves or isolation
valves within the system.
The by-pass is calibrated to assure a mini-
mum flow of 200-300 lts/hr through the main
heat exchanger.
If you are installing a system that includes
thermostatic radiator valves (TRV) and/or
small bore (8-10 mm) it may be necessary to
fit an external by-pass to facilitate correct op-
eration of the boiler.
The fitting of an external bypass helps to pre-
vent and limit system noise.
Air release points
These must be fitted at all high points where
air will natural collect and must be sited to
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