User Guide

22
Service Manual NeoTherm 80 - NeoTherm 285
High Water Temperature Limit Switch (optional)
Laars does not provide this switch. It is installed only where required.
This is a normally-closed (NC) switch. If the water temperature rises
above the pre-set limit, the switch opens.
Some types of switches must be reset manually. To reset this type of
switch, press the button on the control. Other switches will reset auto-
matically.
Correct the cause of the problem and/or replace the switch.
Checking the Flow Switch (optional)
B7
B8
Flow present?
No
Yes
Check for line voltage at the circulator pump
terminals 1-2 on TB5.
Momentarily jump switch
(TB8-6 to TB4-1)
Boiler fires?
Yes
Replace switch.
Check for actual water flow.
Circulator pump running?
No
Check the circulator pump.
See Section B34.
Warning!
Do not leave the room while unit is
operating with the ow switch bypassed.
Remove the jumper as soon as the test is
complete.