entering the mo tor. Caution mu st be exercised, when heating the motor with any source of
heat other than self contained spa ce heaters, to r aise the winding temperature at a g radual
rate to allow any entrapp ed moisture to vapori z e and escape without rupturing the
insulation. Th e entire heatin g cycle should e xtend over 15 to 20 hours.
Insulation resista nc e m ea surements can be made whil e the winding is being heat ed.
However, they must be cor r ec t ed to 104 F (40 C) for evaluati on since the actual insul ation
resistance will decre ase with increasing temp erature. As an approxi m at ion for a new winding,
the insulation resist an ce will approximately hal ve for each 18° F (10° C) incr eas e in insulation
temperature abo ve the dew poin t temperature.
Open-Drive Motor Pre-Start Checks
To pre-vent damage to the m ot or, the following steps mu s t be taken prior to initial start -up:
1. Remove the shaft ship pin g brace (if supplied).
2. For sleeve bearing mo to rs, the oil reservoir mus t be fil led with oil to the correc t le vel. The
proper oil is a rust and oxidati on inhibited, turb ine grade oil. T he viscosity of t he oil must be
32 ISO (150 SSU) at 100 F (37. 7 C) . Oil capacity in each of the t wo bearings is 0.6 gal.
(2.3 L) per bearing. Use of Carrier Oil Spe cification PP16-0 is approved (Mobil DTE L ight or
Sun Oil SUNVIS 916).
3. If possible, the shaft sho uld be turned over by hand to ensure that th er e is fre e rotation. On
sleeve bearing motor s, the shaft should be mo ved to both extremes of its en d play while it is