(Not necessary for gas).
well
Units with serial numbers lower than serial # U 334 601 require annual oil service. Remove the back as described under “In Case of Power Failure” section. Then remove fan blade and six (6) screws that secure heat shield to back. Clean dust away from oil ports (See Figure 6) and oil motor with two (2) drops of SAE 20 light motor oil, one in each oil port.
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