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C-Blower Compartment
-
cated between the indoor coil and the outdoor coil section.
The blower assembly is accessed by disconnecting the
blower motor and all other plugs and removing the screws
in front of the blower housing.
1-Blower Wheels
Units are be equipped with a backward inclined blower
wheel. See “SPECIFICATIONS” at the front this manual
for more detail.
2-Indoor Blower Motor B3
Units are equipped with a direct drive blower assembly
with a three-phase, variable speed, direct drive blower
motor.
be equipped with motors manufactured by various manu-
your unit.
A-Blower Operation
Refer to the Unit Controller Setup Guide to energize blow-
TEST.
In both thermostat and zone control mode, the Unit Con-
troller will stage the blower between low and high speed.
.
WARNING
1- Make sure that unit is installed in accordance with
the installation instructions and applicable codes.
factoryinstalled, for loose connections. Tighten
as required.
3- Check to ensure that refrigerant lines do not rub
against the cabinet or against other refrigerant
lines.
4- Check voltage at disconnect switch. Voltage must
be within range listed on nameplate. If not, consult
power company and have voltage condition
corrected before starting unit.
up.
to instructions provided with thermostat. Unit will cycle on
thermostat demand. The following steps apply to applica-
tions using a typical electro-mechanical thermostat.
1 - Blower operation is manually set at the thermostat
subbase fan switch. With fan switch in ON position,
blowers will operate continuously.
2 - With fan switch in AUTO position, the blowers will
cycle with demand. Blowers and entire unit will be
OFF position.
NOTE - Blower operation mode can also be initiated by
the mobile service app.
Direct-drive motor may not immediately stop when power
is interrupted to the Unit Controller. Disconnect unit power
before opening the blower compartment. The Controller’s
digital inputs must be used to shut down the blower. See
Unit Controller manual for operation sequences.
B-Blower Access
The blower assembly is secured to a sliding frame which
allows the blower assembly to be pulled out of the unit.
See FIGURE 8.
1 - Loosen the reusable wire tie which secures the
controls and high voltage blower wiring to the
blower housing. Disconnect the pressure sensor
low voltage wire harness.
2 - Remove and retain screws on either side (and on
metal handle to pull frame toward outside of unit.
3 -
servicing. Reattach the blower wiring in the previous
location using the wire tie. Reconnect pressure
sensor low voltage wire harness.
4 - Replace retained screws.
The supply CFM can be adjusted by changing the per-
centage of motor output using the Unit Controller settings
Refer to TABLE 1 for menu paths and default settings..
Record any RPM% changes on the parameter settings la-
bel located on the inside of the compressor access panel.
CAUTION
The BLOWER CALIBRATION process starts the
indoor blower at operational speeds and moves
the economizer damper blades. Before starting this
process, replace any access panels and close all
unit doors except compressor compartment door.
Blower calibration is required only on units that are newly
after installation. Use the mobile service app to navigate
After
the new RPM% values are entered, select START CAL-
IBRATION. The blower calibration status is displayed as
a % complete. Upon successful completion, the mobile
service app will display CALIBRATION SUCCESS and go
back to the blower calibration screen.
IMPORTANT - The default value for Cooling Low motor
speed is lower than a traditional singe- or two-speed unit.
If operating the unit with a 2- or 3-stage controller (2- or
3-stage thermostat, DDC controller, etc.), it is recom-
mended to increase the Cooling Low CFM default value
to a suitable level for part load cooling (typically 60% of
full load CFM).
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