Heat Pump Operation - Lennox CBX32MV-018/024 Manual

Heat Pump Operation (Heating and Cooling)
Air Handler Control 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, Control 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. Control on-board link must be cut between Y1 and Y2 to allow two stage cooling operation.
2. Control on-board link must be cut between R and O to allow heat pump operation.
RECOMMEND — USE FIGURE 19 AS A REFERENCE FOR SETTING
JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
Air Handler Control receives inputs on Y1 terminal
Y1 terminal on Control 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 Control 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 Control
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
stage?
Room thermostat
Heating
calls for first
.
Yes
Y2 terminal is an input
to the Control. The
indoor blower will be
controlled according
to the jumper pin
selections.
Yes
No
Cooling
stage?
Air Handler Control receives inputs on Y1 and O terminals
Y1 terminal on Control 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 Control. Will control the indoor blower
according to the cooling mode blower speed, ramping and
adjust selection jumper pins.
Yes
No
De-energize Y2 terminal on Control.
Indoor blower speed will reset to Y1
demand.
NOTE — The outdoor unit control
directly controls the outdoor unit
operation.)
De-energize Y1 (and O in cooling) terminals on
Control.
NOTE — The outdoor unit control directly controls
the outdoor unit operation.
De-energize indoor blower per ramping profile.
Page 41
CUT ON-BOARD LINK
Y1-Y2 FOR
TWO-STAGE A/C
CUT ON-BOARD
LINK R -O.
HARMONY
IMPORTANT — USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 19,
CBX32MV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
Still calling for first
stage?
No
Y1-Y2
2-STAGE
COMPR
R-O
HEAT
PUMP
R-DS
DEHUM
OR
.
Yes
CBX32MV