Dometic 630515.321 Fan Motor Replacement

[Mark Hosier]

Good afternoon.  One of my roof mounted a/c units (Dometic 630515.321 Duo-Therm) has a faulty fan motor and I decided to replace the motor myself.  In preparation, I watched several YouTube videos on the subject, none of which addressed my particular model.  In pulling back the cover and trying to determine the strategy, I consistently run into roadblocks.  Has anyone ever replaced the fan motor on the same model unit and if so, can you describe the process either here or perhaps private message?  I also tried to find a servicing manual for this unit but to no avail.  Does anyone know if one exists and where I may get a copy?
  FYI, the unit will not start by itself.  I replaced both capacitors but that did not help.  I noticed however, after turning the unit on, I can turn the fan motor shaft by hand very easily and the unit then brings it up to speed where it runs without a problem.  Once it shuts down, either via the auto mode or manually, it will not restart on its own. 
  Thank you in advance for any assistance.

Mark

[Steve Huber Co-Admin]

Service Manual covers multiple models including 630515.
Steve
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjkguXA6ez5AhVWmmoFHaTYC1wQFnoECAoQAQ&url=https%3A%2F%2Fdocuments.dometic.com%2Fmedia%2Fdownload%2F81450%3FtemplateId%3D0&usg=AOvVaw0Gk0l_GGMqtqTLrU4y_JOi

[Mark Hosier]

Thanks Steve.  Very good info but unfortunately, nothing on replacement procedures for the fan motor.  I'll keep searching.

Mark

[Michael DeFalco]

mark im not familiar with that model , is it one motor for both indoor air and condenser air .  (double shaft  motor )
if so that would complicate the install. you can still get it done but may need more tools.

[Eric Maclean]

Mark
Not sure which model you have but many of these coaches used the duo therm A/C where removing the motor is a pack a lunch job,  from this video you can also see how the evaporator coil is the most neglected maintenance item in most A/C units it wouldn't hurt to clean it while your there ( use spray on coil cleaner to avoid flooding the coach )
The job may require a good set of Allen wrenches to remove the fan but other than that a socket set and some screw drivers is all you need.


ThIs video  might be what your looking for.

https://youtu.be/INctoM5aXos

Hope this helps
Eric

[Steve Huber Co-Admin]

Added video to Video Library (Private Members Only board).
Thanks Eric!