Therma-Stor Products Group XT150H - Manual (Page 16)

The pump also contains a safety float switch. The white leads
from this switch extend from beneath the pump cover. This switch
should be installed in series with the field wire that connects the
blue (#5) lead from the Ultra-Aire XT150H to the blue (#5) lead on
the control panel.
If the pump fails, this switch opens the compressor control circuit
and stops water production before the reservoir overflows. The
Ultra-Aire XT150H will continue to ventilate or circulate air as
normal, but will not dehumidify until this switch closes.
FOR HVAC INSTALLER ONLY
16
Electric Schematics of the Ultra-Aire XT150H
Ultra-Aire XT150H Installer’s & Owner’s Manual