Installation manual

installation manual TWIN 80 EN
15
2.3.3. Expansion vessel
In the central heating return pipe, as near as to the boiler, an
expansion vessel must be fitted.
The size of the expansion vessel must
be determined on the basis of the central
heating water temperature and the total
water content the installation contains.
Example of Emmeti “Expansion vessel”
The pre-pressure depends on the installation height above the
mounted expansion vessel.
5 meter - 0,5 bar
10 meter - 1,0 bar
15 meter - 1,5 bar
2.3.4. Dirt filter
If it may be expected that the central
heating water will be severely
contaminated by under floor heating,
fitting a 2 kg dirt fine filter in the return
pipe is recommended. With this, possible
contamination of the central heating
water is prevented from ending up in one
of the units.
Coopra cannot give any guarantee for
damage to the unit that is caused by dirt
in the system.
Example of PermaTrade “dirt filter” type PT-FM-25W
2.3.5. Differential bypass valve
A differential bypass valve must be installed on plants where it
may happen that various heating units (radiators) are
simultaneously excluded from the circuit because of the closure
of control or zone valves. It ensures a
recirculation proportional to the number
of shut off valves, thus avoiding noise
and keeping the pump pressure steady.
Example of Caleffi “Bypass valve”
type 519500 (¾”)
Mounting: The differential by-pass valve
must be mounted in the installation
between the flow and the return piping. It
may be mounted both horizontally and
vertically, provided that flow direction indicated by arrow is
respected.
Adjustment: Rotate knob on the desired value of the graduated
scale. The values correspond to the meters of pump head (m
H2O). The advised knob setting is 2.5-3.0. Lock the screw on the
groove knob.
2.3.6. Condensation discharge
Mounting: The siphon (packed with the
boiler) fits onto the discharge pipe (Ø 32
mm) under the boiler. Tighten this
connection with the sealing ring and fix
the nut manually by hand.
The outlet of the siphon has to be
connected to the drain with a tundish.