Navien NP Condensing Tankless Gas Water Heater - Service Manual
Navien NP Condensing Tankless Gas Water Heater - Service Manual
Navien NP Condensing Tankless Gas Water Heater - Service Manual
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4.2. Operation Flow Chart<br />
Power ON<br />
System lnitalization<br />
Faucet Open<br />
Stand-by<br />
Faucet Close<br />
Flow Sensor<br />
>= 0.53 GPM<br />
NO<br />
MGV OFF<br />
MGV OFF<br />
YES<br />
Flame On:<br />
YES<br />
SGV1 OFF<br />
SGV1 OFF<br />
NO<br />
B<br />
SGV2 OFF<br />
SGV2 OFF<br />
Pre-Purge<br />
Watch-dog OFF<br />
MV OFF<br />
No Air Check:<br />
APS normal?<br />
YES<br />
Watch-dog ON<br />
D<br />
NO<br />
YES<br />
Igniter OFF<br />
GV/Igniter Power<br />
OFF<br />
NO<br />
Post-Purge: 10 sec<br />
DHW Waiting:<br />
Fan Motor ON for 300 sec<br />
Fan Motor ON/<br />
AP Check<br />
Flame ON?<br />
NO<br />
YES<br />
NO<br />
MGV OFF?<br />
YES<br />
FM start-up:<br />
FM and AP normal?<br />
YES<br />
Burner Start-up<br />
GV/Igniter Power<br />
ON<br />
Igniter ON<br />
C<br />
NO<br />
B<br />
Flow Sensor<br />
>= 0.53 GPM<br />
Lock-out:<br />
004E<br />
Lock-out:<br />
015E<br />
NO<br />
NO<br />
NO<br />
NO<br />
SGV1 OFF?<br />
YES<br />
SGV2 OFF?<br />
YES<br />
Igniter OFF?<br />
YES<br />
Flow Sensor<br />
>= 0.53 GPM<br />
YES<br />
Igniter ON<br />
for 1 sec?<br />
NO<br />
Lock-out:<br />
027E<br />
C<br />
YES<br />
Igniter OFF<br />
Lock-out:<br />
009E<br />
FM Control<br />
Lock-out:<br />
010E<br />
APS<br />
normal?<br />
NO<br />
YES<br />
©<strong>Navien</strong> America Inc. 2010<br />
29<br />
NR/<strong>NP</strong> series service <strong>Manual</strong><br />
Version 2.0
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