Maintenance Procedures - Trane LPC Install And Operation Instructions

Maintenance Procedures

Perform the following maintenance
procedures to ensure proper unit
operation.
WARNING
Live Electrical Components!
During installation, testing, servicing,
and troubleshooting this equipment, it
may be necessary to work with live
electrical components. Have a
qualified licensed electrician or other
individual who is properly trained in
handling live electrical components
perform these tasks. Failure to follow
all electrical components could result
in death or serious injury.
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power,
including remote disconnects and
discharge all motor start/run
capacitors before servicing. Follow
proper lockout/tagout procedures to
ensure the power cannot be
inadvertently energized. For variable
frequency drives or other energy
storing components provided by Trane
or others, refer to the appropriate
manufacturer's literature for
allowable waiting periods for
discharge of capacitors. Verify with an
appropriate voltmeter that all
capacitors have discharged. Failure to
disconnect power and discharge
capacitors before servicing could
result in death or serious injury.
Air Filters
Reference unit air filter sizes in Table I-GI-
1. Always install filters with directional
arrows pointing toward the fan.
100
Maintenance
Fan Motors
Inspect fan motors periodically for
excessive vibration or temperature.
Operating conditions will vary the
frequency of inspection and lubrication.
Motor lubrication instructions are on the
motor tag or nameplate. If for some
reason these instructions are not
available, contact the motor
manufacturer. Some motor
manufacturers may not provide oil tubes
on motors with permanently sealed
bearings.
Lubricating the Motor
Before lubricating the motor:
1. Turn the motor off and disconnect
power to the unit to ensure the motor
doesn't accidentally start.
2. Use a No. 10 SAE, non-detergent
automotive type oil. Do not over-oil.
Fan Bearings
Fan bearings are permanently lubricated
and do not require additional lubrication.
Sheave Alignment
To prevent interference of the fan frame
with the belt, make sure that the belt
edge closes to the motor has the proper
clearance from the fan frame as shown in
Figure M-MP-1.
Align the fan and motor sheaves by using
a straight-edge or taut string, as shown in
Figure M-MP-1. The straight-edge must be
long enough to span the distance
between the sheave outside edges.
When the sheaves are aligned, the
straigt-edge will touch both sheaves at
points A through D, as shown in Figure M-
MP-1. For uneven width sheaves, place a
string in the center groove of both
sheaves and pull tight. Adjust sheaves
and tighten the sheave set screws to the
correct torques recommended in Table
M-MP-1.
Fan Assembly Set Screws
Check and adjust fan wheel, bearing, and
sheave set screws whenever a
component is removed or an adjustment
is made. Refer to Table M-MP-1 for
recommendations.
maintenance
procedures
Fan Belt Tension
Proper belt tension is necessary to
endure maximum bearing and drive
component life and is based on fan brake
horsepower requirements. Replace belt
when frayed or worn.
Fan belt tension should only be tight
enough so the belt does not slip and
maintains adequate airflow.
Note: Check fan belt tension at least twice
during the first days of new belt operation
since there is a rapid decrease in tension
until belts are run-in.
Be careful not to over-tension fan belt.
Excessive tension will reduce fan and
motor bearing life, accelerate belt wear,
and possibly cause shaft failure. Clean
the sheaves and belt with a dry cloth.
Keep oil and grease away from the belt
because they may cause belt
deterioration and slippage. Trane does not
recommend belt dressing.
CAUTION
Belt Tension!
Do not over-tension belts. Excessive
belt tension will reduce fan and motor
bearing life, accelerate belt wear and
possibly cause shaft failure.
Figure M-MP-1. Proper sheave clearance
and alignment.
LPC-SVX01C-EN