Section 4
INSTALLATION
16
Figure 4---1 Service Air Piping (Typical Installation)
pressure drop. The total pressure drop in the supply
and return piping and associated fittings and valves
shall not exceed 10 PSI (70kPa). If the pressure drop
is excessive, a pump may be installed. Consult the
Sullair Service Department for recommendations.
4.7 ELECTRICAL PREPARATION
Interior electrical wiring is performed at the factory.
Required customer wiring is minimal, but should be
done by a qualified electrician in compliance with
OSHA , National Electrical Code, and any other a p-
plicable state or local electrical code concerning
isolation switches, fuse disconnects, etc. Sullair
provides a wiring diagram for use by the installer.
A few electrical checks should be made to help as-
sure that the first start---up will be trouble free.
DANGER
!
Lethal shock hazard inside.
Disconnect all power at source, before opening or
servicing starter or control panel.
1. Check incoming voltage. Be sure that the incom -
ing voltage is the same voltage that the compres-
sor was wired for.
2. Check starter and overload heater sizes (see
electrical parts in Parts Manual).
3. Check all electrical connections for tightness.
4. “DRY RUN” the electrical controls by disconnect-
ing the three (3) motor leads from the starter. En-
ergize the control circuits by pushing the START
button and check all protective devices to be
sure that they will de---energize the starter coil
when activated.
5. Reconnect the three (3) motor leads and jog the
motor for a direction of rotation check, as ex-
pla ined in Sect ion 4. 8.
4.8 MOTOR ROTATION DIRECTION CHECK
After t he electrical wiring has been done, it is n eces-
sary to check t he direction of the motor rotation.
This can be done by jogging the START and STOP
buttons on the control panel. When looking at the
motor from the end opposite the compressor unit,
the s haft should be turning clockwise. If the motor
shaft is not turning in the proper direction, discon -
nect the power to the starter and exchange any two
of the three power input leads, then re---check rota-
tion. A “Direction of Rotation” decal is located on the
coupling guard between the motor and compressor
to show proper motor/compressor rotation.
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