Lennox CBX32MV Installation Instructions Manual page 33

Heat Pump Operation (Heating and Cooling)
Air Handler Control AHC) Indoor Blower Mode Speed and Profiles settings
1. Set Cooling Mode Blower Speed jumper pin . (Low and high indoor blower CFM settings are identical for
cooling and heat pump)
2. Set Blower Adjust Selection jumper pin.
3. Set Cooling Mode Blower Ramping jumper pin (Cooling calls − All ramping profiles are active) (Heating calls −
Only ramping profiles 1 and 2 are active. If profiles 3 or 4 are selected, AHC will default to profile 1)
A Profile 1 does not provide any ramping profiles.
B Profile 2 provides a 30 second indoor blower ON delay at the start of a heat pump heating demand. (45
second indoor blower OFF delay)
4. Simultaneous Heat Pump and electric heat call: Indoor Blower will operate at the highest CFM requested by
the heat pump or the electric heat blower speed selection.
Single or Two−Stage Unit
1. AHC on−AHC link must be cut between Y1 and Y2 to allow two stage cooling operation.
2. AHC on−AHC link must be cut between R and O to allow heat pump operation.
RECOMMEND USE FIGURE 21 AS A REFERENCE FOR SETTING
JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
Air Handler Control (AHC) receives inputs on Y1 terminal
Y1 terminal on AHC is configured as input and passes signal
from room thermostat to outdoor unit.
NOTE The outdoor unit control directly controls the
outdoor unit operation.
Y1 input to the AHC will control the indoor blower according
to the cooling or heating mode blower speed, ramping and
adjust selection jumper pins.
Room thermostat calls for
second stage?
Yes
Y2 terminal on AHC is
configured as input and
passes signal from
room thermostat to
outdoor unit.
NOTE The outdoor
unit control directly
controls the outdoor unit
operation.)
Still calling for second
Heating
.
Yes
Y2 terminal is an input
to the AHC. The
indoor blower will be
controlled according
to the jumper pin
selections.
Yes
stage?
No
Room thermostat
Cooling
calls for first
stage?
Air Handler Control (AHC) receives inputs on Y1 and O
Y1 terminal on AHC is configured as input and passes signal
from room thermostat to outdoor unit.
NOTE The outdoor unit control directly controls the outdoor
unit operation.)
Y1 input to the AHC. Will control the indoor blower according
to the cooling mode blower speed, ramping and adjust
selection jumper pins.
Yes
No
De−energize Y1 (and O in cooling) terminals on
AHC.
NOTE
the outdoor unit operation.
Page 33
CUT ON−BOARD LINK
Y1−Y2 FOR
TWO−STAGE A/C
CUT ON−BOARD
LINK R −O.
IMPORTANT USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 21,
CBX32MV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
.
terminals
De−energize Y2 terminal on AHC. Indoor
blower speed will reset to Y1 demand.
NOTE The outdoor unit control
directly controls the outdoor unit
operation.)
Still calling for first
stage?
No
The outdoor unit control directly controls
De−energize indoor blower per ramping profile.
Y1−Y2
2−STAGE
COMPR
R−O
HEAT
PUMP
R−DS
DEHUM
OR
HARMONY
Yes
CBX32MV SERIES