Navien CH-180 Service Manual page 26

HC minimum range?
YES
SV1OFF
SV2 OFF
SGV1 OFF?
NO
SGV2 OFF?
NO
Igniter OFF?
NO
HC <= minimum?
NO
Burner Operation
DHW : 3-WAY Valve On
Pump On
©Navien America Inc. 2010
NO HC medium range?
YES
SV1 ON
SV2 OFF
YES SGV2 OFF?
YES Igniter OFF?
NO
YES
Faucet Close
YES
A
24
CH series service Manual
NO HC maximum range?
YES
NO
YES
Lock-out:
E
Heat Demand?
YES
CH : 3- WAY Valve Off
G
NO
Heat Demand?
YES
CH : 3-WAY Valve Off
Fan & Pump ON for 3 min
YES
SV1 ON
SV2 ON
Igniter OFF? YES
NO
015E
NO F
CH : 3-WAY Valve Off
Post-Purge :
F
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