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

Auxiliary heat (while
demand exists)
Dual Fuel?
Yes
Turn off heat pump.
Heat only using gas
heat.
Above the low balance point
All sensors closed
No
and within operating
Yes
Emergency
heat selected?
No
Balance
point region
Go to primary heat
pump heating.
Return to
modulating
heat pump
heat.
Figure 32. Auxiliary Heat
Page 54
No
range?
Yes
Balance Balance
point region point region
Check for status or
fault codes in out­
door control
Go to auxiliary
heating.
XP25