Installation
OAU-SVX01H-EN 29
Standard Wiring
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 29, p. 28, and Figure 30, p. 28.
Complete the unit’s 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. 25 to ensure
that the unit is properly installed and ready for operation.
Voltage Imbalance
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:
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
AVERTISSEMENT
Câblage sur site et mise à la terre corrects
nécessaires !
Le non-respect de la réglementation peut entraîner des
blessures graves, voire mortelles. Il est IMPÉRATIF de
confier l’ensemble du câblage sur site à un électricien
qualifié. Un câblage sur site mal installé ou mal mis à la
terre constitue des risques D’INCENDIE et
D’ÉLECTROCUTION. Pour éviter ces risques, il est
IMPÉRATIF de respecter les obligations en matière de
pose de câblage sur site et de mise à la terre tel que
stipulé dans les règles du NEC et dans les
réglementations électriques locales/nationales.
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.
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 it is 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.
% Voltage Imbalance = 100 X
AV - VD
where;
AV
To Next Page
Loading...