York XT AHU - MOTOR BEARING LUBRICATION; MOTOR AND BASE MAINTENANCE CHECKS

JOHNSON CONTROLS
63
SECTION 3 - MAINTENANCE
FORM 102.20-OM2
ISSUE DATE: 6/01/2015
3
FIGURE 59 - OPEN DRIP PROOF (ODP) MOTOR
LD09635
FIGURE 60 - TOTALLY ENCLOSED FAN COOLED
(TEFC) MOTOR
LD09639
Checking Condition of Mounting Hardware,
Adjustable Motor Base and Motor
Hardware and Motor Base - Check for loose parts
and damage. If the parts are damaged, replace the parts.
Motor - Check the motor for leaky bearing seals, dam-
age and dirt, dust, and debris in the motor housing.
Checking Electrical Connections
Check the following:
1. Electrical terminations.
2. Conduitttingsandclampsfordamageorloose-
ness.
3. Operating amperage, and compare the number to
the number listed on the AHU nameplate.
Keep Motor Bearing Lubricated
Bearing grease will lose its lubricating ability over
time because the lubricating ability depends primar-
ily on the type of grease, size of the bearing, speed
at which the bearing operates, and the severity of the
operating conditions. Good results can be obtained if
the following recommendations are used in this main-
tenance program:
1. Use a high-grade ball or roller bearing grease such
as Polyrex EM (Exxon Mobile) for all "T" frame
motors.
2. Maximum operating temperature for standard
motors is 166°F/75°C.
3. Recommended lubrication intervals are shown in
Table 16 on page 64. Refer to all three tables.
4. Use the following steps to lubricate the motor.
To avoid damage to the motor bearings,
keep the grease free of dirt. For an ex-
tremely dirty environment, contact your
distributor or an authorized service center
for additional information.
If the AHU is equipped with a grease relief plug, use
the following instructions to replace the grease:
1. Be sure that the grease you are adding to the
motor is compatible with the grease already
in the motor. Consult a distributor or an au-
thorized service center if grease other than
the recommended type is to be used.
2. Clean all grease fittings.
3. Remove the grease relief plug.
4. If motor is stopped, add the recommended
amount of grease.
5. If the motor is to be greased while running,
add a slightly greater quantity of grease
slowly until the new grease appears at the
shaft hole in the end plate or relief plug hole.
6. Clean off any grease from the grease fitting.
7. Run motor for 15–30 minutes with the relief
plug removed to warm up the grease.
8. Wipe off any grease that was pushed out of
the relief plug.
9. Reinstall the grease relief plug.