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entering the motor. Caution must be exercised, when heating the motor with any source of
heat other than self contained space heaters, to raise the winding temperature at a gradual
rate to allow any entrapped moisture to vaporize and escape without rupturing the
insulation. The entire heating cycle should extend over 15 to 20 hours.
Insulation resistance measurements can be made while the winding is being heated.
However, they must be corrected to 104 F (40 C) for evaluation since the actual insulation
resistance will decrease with increasing temperature. As an approximation for a new winding,
the insulation resistance will approximately halve for each 18° F (10° C) increase in insulation
temperature above the dew point temperature.
Open-Drive Motor Pre-Start Checks
To pre-vent damage to the motor, the following steps must be taken prior to initial start-up:
1.
Remove the shaft shipping brace (if supplied).
2.
For sleeve bearing motors, the oil reservoir must be filled with oil to the correct level. The
proper oil is a rust and oxidation inhibited, turbine grade oil. The viscosity of the oil must be
32 ISO (150 SSU) at 100 F (37.7 C). Oil capacity in each of the two bearings is 0.6 gal.
(2.3 L) per bearing. Use of Carrier Oil Specification PP16-0 is approved (Mobil DTE Light or
Sun Oil SUNVIS 916).
3.
If possible, the shaft should be turned over by hand to ensure that there is free rotation. On
sleeve bearing motors, the shaft should be moved to both extremes of its end play while it is