Lennox LHT/LDT024 Installation Instructions Manual page 33

Heating Operation
A-Heat Pump Operation
W1 Demand -
Compressor High
Blower Heating Speed
Reversing Valve De-Energized
W2 Demand (Optional Electric Heat) -
Compressor High Speed
Blower Heating Speed
Reversing Valve De-Energized
Optional Electric Heat Energized
Note - Electric heat is also energized during the defrost
cycle.
B-Gas Heat Operation
1-Outdoor Temperature ABOVE Balance Point Setpoint
W1 Demand -
Compressor High
Blower Heating Speed
Reversing Valve De-Energized
W2 Demand -
Compressor Off
Blower Heating Speed
Low Gas Heat Energized
Note - Gas heat is also energized during the defrost
cycle.
LHT/LDT024, 036, 048, 060
2-Outdoor Temperature BELOW Balance Point Setpoint
W1 Demand -
Compressor Off
Blower Heating Speed
Low Gas Heat Energized
W2 Demand -
Compressor Off
Blower Heating Speed
High Gas Heat Energized
Note - Gas heat is also energized during the defrost
cycle.
High speed compressor heating operation:
RTU MENU > COMPONENT TEST > HEATING
Defrost Operation Test:
RTU MENU > COMPONENT TEST > DEFROST
C-Heat Pump Heating - 024 Units Only
In heat pump heating, 024 units will automatically
stage-up for outdoor temperatures below 40_F (for
increased performance and efficiency). No external
demand is required, this operation is completely
automatic. At temperatures above 40_F, compressor will
automatically stage-down to maintain operational
efficiency.
Page 33