Lennox EIM - Unit Type Jumpers; Heat Stage Jumper Positions

5
NOTE: For two-stage heat pump go to the heat pump defrost control,
locate P3 - low ambient thermostat pins and disable this function
by removing the installed jumper and relocating it to one pin only.
Unit Type Jumpers
Set the unit type jumper for the type of indoor unit, Use the following
table and gure as a guide. The factory default setting is IFC. If jumper is
missing from the jumper pins, then alarm 130 is activated.
Table 2. Unit Type Jumpers Positions
Jumper
Position
Indoor Unit Outdoor Unit
HP
Lennox Communicating
Furnace
Conventional Heat Pump
IFC Conventional Furnace
Conventional Heat Pump or air
conditioner
AHC Conventional Air Handler
HP IFC AHC
Figure 3. Unit Type Jumper Positions
Heat Stage Jumper Positions
The factory default setting is position 2 (two heat stages). If jumper is
missing from the jumper pins, then alarm 130 is activated. Depending on
the type of equipment and system set up being used:
• Set the number of stages of electric heat (air handler) when jumper pin
selection is AHC selection.
• Set the number of stage of gas heat (Furnace) when jumper pin selection
is IFC.
• Set the number of stages of the compressor when jumper pin selection
is HP.
0 1 2 3
Figure 4. Heat Stage Jumper Positions
Table 3. Heat Stage Jumpers
Label
(Position)
Air Handler Heat
Stages
Furnace Heat Stages Heat Pump Stages
Number of
Electric Heat
Stages
Stage
Percentage
Number of
Gas Stages
Stage
Percentage
Number of
Compressors
Stages
Stage
Percentage
0
No Electric
Heat
0 1 100% 1 100%
1 1 100% 1 100% 1 100%
2
(default)
2
50%,
100%
2
70%.
100%
2
70%.
100%
3 3
33.5%,
66.5%,
100%
2
70%,
100%
2
70%.
100%
NOTE: If jumper is missing, setting defaults to single stage. Changing jumper position
after power-up requires recommission for the change to be recognized.
24VAC Heat Pump Size Setting
Heat pump size must be congured when using a non-communicating
heat pump using the Heat Pump Size jumper (see gure 4 and table 5).
Factory default setting is for 3.0 (3-ton). If jumper is missing from jumper
pins then alarm 130 is activated.
1.
5
2.
0
2.
5
3.
0
3.
5
4.
0
5.
0
Figure 5. Conventional Heap Pump Capacity Jumper Setting