Page 20
C-Blower Compartment
NOTE - Units equipped a Variable Frequency Drive (VFD)
are designed to operate on balanced, three-phase power.
Operating units on unbalanced three-phase power will re-
duce the reliability of all electrical components in the unit.
Unbalanced power is a result of the power delivery system
supplied by the local utility company. Factory-installed in-
verters are sized to drive blower motors with an equiva-
lent current rating using balanced three-phase power. If
unbalanced three-phase power is supplied; the installer
must replace the existing factory-installed inverter with an
inverter that has a higher current rating to allow for the im-
balance. Refer to the installation instructions for additional
information and available replacements.
The blower compartment in all units is located between
the evaporator coil and the condenser coil section. The
blower assembly is accessed by disconnecting the blower
motor .See Blower Access in the Operation/ Adjustment
section.
1-Blower Wheels
blower wheel.
2-Indoor Blower Motor B3
Operation and Adjustments
A-Three Scroll Compressor Voltage Phasing
Three phase scroll compressors must be phased
sequentially to ensure correct compressor and blower
rotation and operation. Compressor and blower are wired
Observe suction and discharge pressures and
marking.
Disconnect all remote electrical power supplies.
at blower contactor or compressors.
Make sure the connections are tight.
Discharge and suction pressures should operate at their
Supply Air Inverter Units - Units are equipped with a
phase monitor located in the control compartment. The
will turn red and the unit will not start. In normal operation
green.
B-Blower Operation
Initiate blower demand at thermostat according to
instructions provided with thermostat. Unit will cycle
Blower operation is manually set at the thermostat
ON
blowers will operate continuously.
AUTO
cycle with demand. Blowers and entire unit will be
OFF position.
C-Blower Access
Loosen the reusable wire tie which secures the
blower wiring to the blower motor mounting plate.
location on the blower motor base using the wire tie.
To Next Page
Loading...
Need help?
General
