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IMPORTANT INSTALLER NOTE
For improved start up performance wash the indoor coil
with a dish washing detergent.
THREE PHASE SCROLL COMPRESSOR
Scroll compressors, like several other types of
compressors, will only compress in one rotational
direction. Direction of rotation is not an issue with
single phase compressors since they will always start
and run in the proper direction.
However, three phase compressors will rotate in either
direction depending upon phasing of the power.
Since there is a 50-50 chance of connecting power
in such a way as to cause rotation in the reverse
direction, verification of proper rotation must be made.
Verification of proper rotation direction is made by
observing that suction pressure drops and discharge
pressure rises when the compressor is energized.
Reverse rotation also results in an elevated sound level
over that with correct rotation, as well as substantially
reduced current draw compared to tabulated values.
Verification of proper rotation must be made at the time
the equipment is put into service. If improper rotation
is corrected at this time, there will be no negative
impact on the durability of the compressor. However,
reverse operation for over one hour may have a negative
impact on the bearing due to oil pump out.
NOTE: If compressor is allowed to run in reverse
rotation for several minutes, the compressor's
internal protector may trip.
All three phase compressors are wired identically
internally. As a result, once the correct phasing
is determined for a specific system or installation,
connecting properly phased power leads to the same
Fusite terminal should maintain proper rotation
direction.
The direction of rotation of the compressor may be
changed by reversing any two line connections to the
unit.
PHASE MONITOR
All units with three phase scroll compressors are
equipped with a 3 phase 60/50 Hz line monitor to
prevent compressor damage due to phase reversal. No
changes required for 60 or 50 Hz operation.
The phase monitor in this unit is equipped with two
LEDs. If the Y signal is present at the phase monitor
and phases are correct the green LED will light.
If phases are reversed, the red fault LED will be lit and
compressor operation is inhibited.
Manual 2100-615A
Page
16 of 24
If a fault condition occurs, reverse two of the supply
leads to the unit. Do not reverse any of the unit factory
wires as damage may occur.
SERVICE HINTS
1. Caution owner/operator to maintain clean air
filters at all times. Also, not to needlessly close
off supply and return air registers. This reduces
airflow through the system, which shortens
equipment service life as well as increasing
operating costs.
2. Check all power fuses or circuit breakers to be sure
they are the correct rating.
3. Periodic cleaning of the outdoor coil to permit full
and unrestricted airflow circulation is essential.
DIGITAL CONTROLLER
The W3R/LV2 through W6R/LV2 variable capacity
air conditioners utilize dedicated controllers and
components to optimize this unit for cooling operation
from -40°F up to 131°F (-40°C to +55°C). These
units are dual rated for 200-240V operation on both
50 and 60 Hz. Please read the following sequence
of operation before attempting any troubleshooting or
repair. Troubleshooting and repair procedures will be
outlined below and later in this manual.
These models use a digital compressor and variable
speed indoor and outdoor motors. The motors and
compressor must be replaced with the exact same
component to maintain the above stated temperature
and voltage ranges of operation. The units are
controlled by a Bard digital thermostat/controller. This
thermostat/controller contains proprietary programming
and must be replaced with the exact same component
to ensure proper operation.
See Controller Quick Start Manual 2100-559 and
Controller Advanced Programming Manual 2100-560
for complete details.
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