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DEMETRA
EN
Hydraulic connection diagrams Demetra: with boiler and security exchanger.
Fig. 23 - Connection 3
LEGEND Fig. 23 page 22
VEA Open expansion tank
IR Heating system
AI System supply
SI Flue damper
VR Check valve
PI System pump
RI System return
SC Drain
EAF Cold water inlet
UAC Hod water outlet
B Boiler
PB Boiler pump
AB Boiler supply
RB Boiler return
S Coil
TS Safety pipe
VST Download thermical valve
10.11 PROCEDURES AND CHECKS BEFORE CONNECTING THE RANGE
1 - Carefully wash all the pipes in the system in order to remove any manufacturing residue which might
compromise the correct operation of the pumps, valves, etc.
2 - Ensure that the chimney ue does not have chocked section, that there is a good draft and that the ue is
made in compliance with the laws in force.
It is advisable to install a draft regulator to limit the suction of the ue to 16 Pa, in order to avoid unexpected
increases in power. Joints should be checked in the existing ues.
3 - Verify the air entrance on the rear will not be chocked.
10.12 FEEDWATER CHARACTERISTICS
Chemical and physical characteristics of water are fundamental to guarantee long life and an efcient
operation of the range.
Scale deposits are the most frequent problems affecting heat exchange surfaces, caused by bad-quality water.
The low heat conductivity of scale generates localised overheating, detrimental for the range.
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