Transition To Auxiliary Heat - Lennox XP25-024-230-01 Installation And Service Procedure

From modu­
lating heat
pump heat.
Heat pump ran for
No
at least 30 minutes?
Yes
Defrost in the last 30
No
minutes?
Yes
Auxiliary heat is
used to satisfy all
heat calls during
heat pump lock­
Back to modulating
out.
heat pump heat.
Go to auxiliary
heat.
Figure 31. Transition to Auxiliary Heat
XP25
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