Operation Flow Chart - Navien NP-180 Service Manual

4.2. Operation Flow Chart

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