The heater and vent system should be checked once a year by a qualified technician.
WARNING: Open all disconnect switches and disconnect all electrical and gas supplies and secure in that position before servicing unit. Failure to do so may result in personal injury or death from electrical shock.
WARNING: Gas tightness of the safety shut-off valves must be checked on at least an annual basis.
Should maintenance be required, perform the following inspection and service routine:
Check lubrication instructions on motor. If oiling is required, add 1 or 2 drops of electric motor oil as follows:
CAUTION: Never over oil the motor or premature failure may occur!
Source: Trane (www.trane.com)