LAARS NeoTherm NTV (Sizes 150–285 MBTU/h) - Service Manual - Manual (Page 23)

13 Service Manual NeoTherm 80 - NeoTherm 285
10. Check for 24V AC between terminals 1 and 2 of
J8 on the control module. See Fig. B1-6. If 24V
AC is present here, this means that the Con-
densate trap level switch is OK. If 24V AC is not
present, troubleshoot the condensate trap level
switch. See Section B12.
11. If you see 24V AC at J8, this means that all of the
switches in the safety chain are satisfied. The
blower should run, and then the pressure switch
should close, allowing the ignition sequence to
start. To check the pressure switch, check for
continuity (no resistance) between terminal 1 on
J6 and terminal 1 on J5 on the control module.
See Fig. B1-7.
If the pressure switch remains open, go to Sec-
tion B15, “Checking the Air Pressure Switch.”
Fig. B1-6 - Checking the safety switches
Fig. B1-7 - Checking the safety switches
Quick Check of Components in the
Safety Interlock Chain - continued
B1
cont.
J8 1-2
J6-1
J5-1