2-16 Maintenance procedures
The following maintenance procedures apply to both deckhouse and voids ventilation systems.
Servicing ventilation systems fans and motors. These procedures are in Chapter 2, TM 55-1930-209-
Replacing ventilation systems fans and motors
Each ventilation fan and motor is a unit and must be replaced by a like Item unit. Repair is
beyond crew capability.
On power panel 2, on ROWPU space starboard bulkhead forward of sliding door, open the circuit breaker
providing power to the fan to be replaced.
Redtag that circuit breaker indicating, "WARNING DO NOT ACTIVATE REPAIRS BEING MADE."
On controller for fan to be replaced, push switch OFF. Redtag controller as indicated in step b.
Remove fan motor access plate.
Disconnect electrical wiring to motor junction box. Label each wire and push out of working area.
Unbolt motor at base and remove motor and fan from ventilator shaft.
Install new motor and fan in reverse order.
Check that fan has proper clearance all around ventilating shaft. If not, loosen motor mounting bolts and adjust
position of motor until fan has proper clearance.
Connect electrical wiring to motor junction box.
Check that fan housing is clear of all tools and cleaning cloths.
Close circuit breaker providing power to replaced fan. Do not remove red tag at this time.
On controller for replaced fan, push ON for just a moment. Check that fan rotates in proper direction to move air
as desired If fan rotates In proper direction, go to step s If fan rotation is not correct, continue with step m.
Turn controller on replaced fan to OFF. Ensure red tag is still attached.
Open power panel 2 circuit breaker that controls power to replaced fan. Red tag should still be attached
Disconnect any two wires to motor junction box and reverse the wires
Check that fan housing is dear of all tools and cleaning cloths.
Close circuit breaker providing power to replaced fan but do not remove red tag.
On controller for replaced fan, push ON for just a moment Check that fan rotates in proper direction to move air
as desired. Push controller to OFF.
Replace fan motor access plates. Coat bolts lightly with general purpose water-resistant grease (MIL-G-24139A).
Make sure bolts are tight.
Remove red tags from fan motor controller and circuit breaker in power panel 2
Record completion of this maintenance item in log book.