eNeRGy-IOM-2020.11-EN
• 51 •
General
introduction of the
PCH
• Premix burner (venturi, gas fan, pilot group, head) gas valve
• Electronic controls with display
• Combustion chamber in stainless steel AISI 430 (AISI 441 in the next future)
• Exchanger bundle in stainless steel AISI 441
• Safety thermostat (and additional probe)
The PREMIX
T
echnology
NO AIR=NO
GAS
PCH working cycle
• Heat is required
• Burner fan starts to pre-wash combustion chamber EV1 and EVP gas valves open to gas feed pilot burner
• Start up electrode gives ignition sparks on pilot burner
• EV2 main gas valve opens to gas feed main burner
• Combustion starts thanks to pilot flame ignition
• The electronic boards close EVP and stops the pilot
Air fans
ON delay ≤ 60’’ after the burner ON
OFF delay ≥ 180’’ after the burner OFF
Possible safety devices of the fans must be connected in series with the burner (ID1/IDC on terminal CN08)
STB and temperature probe
Safety Thermostat STB: it stops the burner at 100°C (manual reset required by Gas Directive)
NTC temperature probe: it forces the burner to modulate (factory set of ST1 = 45°C) or to stop (f.s. of TH1=60) before the STB,
automatic reset as soon as the air temperature decreases. Fault F51 recorded.
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