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B3 - checking the safety interlocks, Checking the safety interlocks, See section b3 – LAARS NeoTherm NTV (Sizes 150–285 MBTU/h) - Service Manual User Manual

Page 26: Ing the safety interlocks

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Service Manual NeoTherm 80 - NeoTherm 285

Checking the Safety Interlocks

B3

24V AC is

present?

(all switches closed)

Yes

No

Safety interlock 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

See procedure B4 -

“Checking the Low Water Cutoff Switch”

No

Check for 24V AC between

TB8-4 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

TB8-6 and TB4-1.

24V AC is

present?

No

See procedure B8 -

“Checking the Flow Switch”

Yes

Continued

This manual is related to the following products:
See also other documents in the category LAARS Water boiler: