Lennox Harmony III

41
RECONNECT THIS
END TO G PIGTAIL
CUT HERE
TAPE OFF
THIS END
Figure 31. Electrical Adjustments for Air Handler Control CBX25UHV
Asshowninthegureabove,makethefollowingadjustments:
• Blue wire that goes between plug # 2 of the circuit board and one side of the
contacts on the BR relay must be removed and connected to the G pigtail. Tape
off end of wiring going to the circuit board jack plug. If this wire is not removed,
the DS signal from the Harmony III zoning system control will not be able to vary
the speed of the indoor blower motor.
• Connection from BR relay to G required to provide blower operation during electric
heat sequencer shutoff time period after demand ends. Otherwise electric heat
can remain on for a period without blower operation and trip one shot thermal
limits on elements.