AAON LN-140 - Manual (Page 41)

41
Check rotation arrow prior to operating the
unit. The rotation of all Vertical In-Line
units is “clockwise” when viewed from the
drive end. (Looking from on top of / behind
the motor)
General Care
Vertical In-Line pumps are built to operate
without periodic maintenance, other than
motor lubrication on larger units. A
systematic inspection made at regular
intervals, will ensure years of trouble-free
operation, giving special attention to the
following:

Keep unit clean

Keep moisture, refuse, dust or other
loose particles away from the pump and
ventilating openings of the motor.

Avoid operating the unit in overheated
surroundings (Above 100ºF/40ºC).
Any possibility of the unit starting while
being serviced must be eliminated.
If
mechanical seal environmental
accessories are installed, ensure water is
flowing through the sight flow indicator and
that filter cartridges are replaced as
recommended.
Pump Lubrication
Lubrication is not required. There are no
bearings in the pump that need external
lubrication service.
Large Series split-coupled units are installed
with a shaft bushing located beneath the
impeller that is lubricated from the pump
discharge. This bearing is field removable
for service on the 20x20x19 size without
disturbing the motor or other major pump
components.
Motor
Follow
the lubrication procedures
recommended by the motor manufacturer.
Many small and medium sized motors are
permanently lubricated and need no added
lubrication. Generally if there are grease
fittings evident the motor needs periodic
lubrication, and if there are no grease fittings
evident, no periodic lubrication is required.
Check the lubrication instructions supplied
with the motor for the particular frame size
indicated on the motor nameplate.
Mechanical Seal
Mechanical
seals require no special
attention. The mechanical seal is fitted with
a flush line. The seal is flushed from
discharge of the pump casing on split-
coupled pumps and is flushed/vented to the
suction on close coupled pumps.
The split-coupled pump is flushed from the
pump discharge because the mechanical seal
chamber is isolated from the liquid in the
pump by a throttle bushing. Because the seal
chamber is isolated, seal environmental
controls such as filters and separators, when
installed in the split-coupled flush line are
very effective, as only the seal chamber
needs cleansing, and will prolong seal life in
HVAC systems.
Do not run the pump unless properly filled
with water as the mechanical seals need a
film of liquid between the faces for proper
operation.
Electric shock hazard. Before
attempting to perform any service or
maintenance
on pumping unit,
disconnect power source to the
driver, LOCK IT OFF and tag with the
reason.
WARNING