Detroit Radiant Products Company FA Series - Manual (Page 47)

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FA Series 5.0 Maintenance
9 Check lubrication instructions on motor. If oiling is required, add three or four drops of SAE 20 electric
motor oil:
• After three years or 25,000 hours (for light-duty operation).
• Annually after three years or 8,000 hours (for medium-duty operation).
• Annually after one year or 1,500 hours (for heavy-duty operation).
NOTICE
Never over-oil the motor, or premature failure may occur.
10 Check and test functions of all safety devices supplied with the heater.