B3 - checking the safety chain, Checking the safety interlocks, See section b3 – LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual User Manual
Page 26: Sect. b3), Ing the safety interlocks, Checking the safety chain
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16
Service Manual - NeoTherm 500
Checking the Safety Chain
B3
24V AC is
present?
(all switches closed)
Yes
No
Safety chain is OK
Check for 24V AC between
TB8-1 and TB4-1.
Check for 24V AC between
TB8-2 and TB4-1.
24V AC is
present?
Yes
“Checking the Low Water Cutoff Switch”
No
Check for 24V AC between
TB8-3 and TB4-1.
24V AC is
present?
Yes
Check the optional external
high limit switch:
1. Check for actual high outlet
temp. condition (manual reset)
2. Check temp. setting on switch
3. Replace switch
No
Check for 24V AC between
TB8-5 and TB4-1.
24V AC is
present?
Yes
Continued
No
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