Lennox eNeRGy Series Installation, Operating And Maintenance page 51

GAS BURNER
General introduction of the PCH
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Premix burner (venturi, gas fan, pilot group, head) gas valve
GAS BURNER
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Electronic controls with display
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Combustion chamber in stainless steel AISI 430 (AISI 441 in the next future)
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Exchanger bundle in stainless steel AISI 441
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Safety thermostat (and additional probe)
PCH working cycle
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Heat is required
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Burner fan starts to pre-wash combustion chamber EV1 and EVP gas valves open to gas feed pilot burner
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Start up electrode gives ignition sparks on pilot burner
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EV2 main gas valve opens to gas feed main burner
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Combustion starts thanks to pilot flame ignition
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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.
eNeRGy-IOM-2020.11-EN
The PREMIX Technology
NO AIR=NO GAS
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