Thermal Dynamics SIGNATURE PAK 1250XRTM, Owner'S Manual

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SERVICE
4.3 POWER SUPPLY MAINTENANCE
The fan motor in the power supply should be oiled twice
per year or once for each 100 hours of operation. To oil the
motor, remove one side panel and add two or three drops
of 20 SAE oil to the front and rear oil holes on the motor.
Some units may utilize a sealed motor design which does
not require lubrication.
The only other routine maintenance required for the
power supply is a thorough cleaning and inspection, with
the frequency depending on the usage and the operating
environment.
To clean the unit, first make sure that the power is discon-
nected. Remove the side panels and blow out any accumu-
lated dirt and dust with compressed air. The unit should
also be wiped clean. If necessary, solvents for cleaning
electrical apparatus may be used.
While the side panels are off, inspect the wiring in the
unit. Look for any frayed wires or loose connections that
should be corrected. When cleaning the unit, inspect the
area around the high frequency spark gap points. Accu-
mulated dirt in the area around the spark gap assembly
can weaken the high frequency starting and cause poor
pilot starting.
Press-in ‘captive’ nuts are used to assemble the power
supply enclosure. Occasionally a press-in nut may break
free and turn loosely in the sheet metal.
Should this occur, the nut may be reinstalled using the bolt
that threads into it. Hold the nut securely with vise grips
and thread the bolt into the nut until the nut is drawn up
and compressed against the panel. When the nut is secure,
the bolt may be removed and reinstalled.
Fan Motor Lubrication
Figure 4-E Captive Nuts
NOTE
Routine Maintenance
Captive Nuts