Navien CH-180 Service manual - page 38
36
4.6.4. High Limit Switch or Exhaust Limit Switch
Navien Part No.
Function
Check Point
BH1401022A
BH1401027A
B
Failure Event
Effects
Error Code
E016, E030
Diagnostic
Color /
Number of wires
1. Overheating preventing switch.
2. Due to the high temperature, it will automatically trip and automatically
reset.
3. Detects excessively high water temperature
(more than 197.6
ı) in heat exchanger. (BH1401022A)
4. Detects excessively high flue gas temperature
(more than 149
ı) in exhaust duct. (BH1401027A)
1. Unable to detect excessively high water temperature if switch fails.
2. Unable to detect excessively high flue gas temperature if switch fails.
1. Visual inspection: Connection and/or breakage of wires.
2. Voltage check: Check range of voltage shown below.
1. Yellow – Yellow : DC 4 ~ 6 V
2. Red – Red : DC 4 ~ 6 V
1. Unable to shut down the boiler if the water temperature from the heat
exchanger exceeds 197.6
ı(92 ç).
2. Unable to shut down the boiler if the flue gas temperature from the
exaust duct exceeds 149
ı (65 ç).
G
ڪڡڡڃڪګڠکڄ
ڪکڃڞڧڪڮڠڄ
ڃڜېۏۊۈڼۏۄھٻڭۀۏېۍۉڄ
ڃڑڐڏڄ
ڡۇېۀٻڢڼێ
ڃڜېۏۊۈڼۏۄھٻڭۀۏېۍۉڄ
ڃڔڍڏڄ
ڲڼۏۀۍ
ڌڏڔڎڔډڍඑ
ڌڒڔډڑڎڔډڍඑ
ڌڋڏڎڔډڍඑڃڏڋڏڄ
ڌڒڋډڑڎڔډڍඑڃڒڒڏڄ
©Navien America Inc. 2010
CH series service Manual
Version 1.0