Trane Horizon OADG Series Installation, Operation And Maintenance Manual page 32

Installation
The electrical service must be protected from over current
and short circuit conditions in accordance with NEC
requirements. Protection devices must be sized according
to the electrical data on the nameplate.
1. Location of the applicable electrical service entrance is
illustrated in Figure 37, p.
power wiring connections onto either; the main
terminal block HTB1 inside the unit control panel, the
factory mounted non-fused disconnect switch (UCD)
or circuit breaker (UCB), or the electric heat non-fused
disconnect switch. Refer to the customer connection
diagram that shipped with the unit for specific
termination points.
2. Provide proper grounding for the unit in accordance
with local and national codes.
Use the following checklist in conjunction with the
checklist in "General Unit Requirements," p. 27
that the unit is properly installed and ready for operation.

Verify that the correct size and number of filters are in
place.

Inspect the interior of the unit for tools and debris and
install all panels in preparation for starting the unit.

Check all electrical connections for tightness and
"point of termination" accuracy.

Verify condenser airflow is unobstructed.

Verify that the condenser and indoor fans turn freely
without rubbing and are properly tightened on the
shafts.

Check motor mounting bolts and inlet cone for
tightness. Free spin wheel by hand to check for proper
alignment of motor, wheel, and inlet cone. Record
motor nameplate amps at unit-rated voltage.

Check proper indoor fan wheel rotation. Wheel
housing will be marked to indicate direction of proper
rotation.

With access doors closed and secured, operate
blower at 100 percent speed. Check amp readout of
amps output to indoor fan at VFD display to confirm
operation within motor amp capacity.
32
30. Complete the unit's
to ensure
Voltage Imbalance
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been properly
trained in handling live electrical components perform
these tasks.
AVERTISSEMENT
Composants électriques sous tension!
Le non-respect de toutes les consignes de sécurité lors
de la manipulation de composants électriques sous
tension peut entraîner des blessures graves, voire
mortelles. S'il est nécessaire de travailler avec des
composants électriques sous tension, demandez à un
électricien qualifié et agréé ou à une autre personne
ayant la formation nécessaire pour manipuler des
composants électriques sous tension d'exécuter ces
tâches.
Three phase electrical power to the unit must meet
stringent requirements for the unit to operate properly.
Measure each leg (phase-to-phase) of the power supply.
Each reading must fall within the utilization range stamped
on the unit nameplate. If any of the readings do not fall
within the proper tolerances, notify the power company to
correct this situation before operating the unit.
Excessive three phase voltage imbalance between phases
will cause motors to overheat and eventually fail. The
maximum allowable voltage imbalance is 2.0 percent.
Measure and record the voltage between phases 1, 2, and
3 and calculate the amount of imbalance as follows:
% Voltage Imbalance = 100 X
Volt 1 + Volt 2 + Volt 3
AV (Average Voltage) =
V1, V2, V3 = Line Voltage Readings
VD = Line Voltage reading that deviates the farthest from
the average voltage.
Example: If the voltage readings of the supply power
measured 221, 230, and 227, the average volts would be:
221 + 230 + 227
= 226 Avg.
3
VD (reading farthest from average) = 221
AV - VD
where;
AV
3
OAU-SVX006C-EN