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fan motor speed issue
March 26, 2012
5:56 pm
refman
kent narrows, chesapeake bay
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October 23, 2011
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Hi Steve it is me back again i need you to direct me to the best place to buy a new unit.  i want to take your advice and not put more money into a less than best unit.  as you know it has been tough economically so send me to a great place to buy and have it shipped to me. i will do my own install as HVAC is my trade. i also should update the controls as you recommend.

 

Thanks and Please Advise<img class="sfsmiley" title="Smile" onclick="sfjLoadSmiley('sf-smile.gif', 'Smile', '** you don't have permission to see this link **;, 'Smile', '1');" src="/wp-content/forum-smileys/sf-smile.gif" alt="Smile" />

 

refman

March 26, 2012
5:46 pm
refman
kent narrows, chesapeake bay
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refman said:

I have a Marine airr Model VCP16KHV  ser # A2-M09782   passport II digital control.

 

ran wonderful for 8 years factory installed by Regal. on my 3880.

today the system started normally after less than a minute of operation the evap fan motor began making a very loud buzzing noise, and the motor slowed to a very low RPM. kept operating compressor running, fan too slow to be effective, if i start over again same results, motor runs very free and free wheels a while after shutting off.

motor draws .8-.9 amps and when the buzz and low RPM occors it really does not increase or decrease the amp draw??

so what is happening? and why.

any advice on where to start now.

Thanks!

November 9, 2011
9:13 am
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Steve Pooler
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November 12, 2008
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I would say yes on the bad fan motor…Must have a winding heating up & breaking down with that heat…

Thing is…Marine Air (Dometic) no longer offers replacement motors…Only replacement blower assemblies that are not cheap, because all replacements are the new High Velocity type with the motor inside the squirrel cage.

Looking in the parts book it seems your model's replacement retails for $710.00…

Also looking back at your first post with the model #…Yours has a "HV" which might imply that you already have the High Velocity blower…I wasn't aware that Marine Air was using it 8 years ago so I must ask…

Does your motor stick out the side of the blower housing ?…That would be the older "shaded pole" design with no capacitor and no "exact" replacement (just the kit I mention above)

Is the unit in good enough shape to invest that kind of money in ?

Also consider it has the Passport II…Which the keypad/display is no longer available for…The Passport II circuit board is still available but costs $5.00 more than the retrofit kit to the new Passport I/O that comes with both the display & board and has improvements to the parts on the board…

What I'm hinting at here is…You invest in a blower…Then shortly after the board or display decides to fail (it's old enough now & I have been getting a run on Passport II failures lately)…You are then close to halfway toward a new Turbo unit that has a warranty, is more efficient, lighter, quieter, uses less power, has a drain pan that can't rust, and also drains better…

Just a thought… 

 

Steve~

November 8, 2011
7:40 pm
refman
kent narrows, chesapeake bay
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hi Steve its me back again.

 

got to the boat this weekend and removed the fan wires from the control board, applied 120 volts directly to the fan leads.

 

The fan ran at full speed drawing less than an amp.  after running normally for a couple minutes the fan began running slow again, too slow to move air adequately. the buzzing was noticable, but not as serious as when wired to the Passport.

 

turning off the power the fan free wheeled for a while and does not appear to have any resistance beyond normal.

 

waiting only a few seconds after fan stopped, restoring power the fan returned to full speed and ran normal for less than a minute, then went slow again. repeating this process caused the motor to run at full speed shorter each time shortest time was less than 10 seconds.

when running at slow speed when wired direct the amperage drops to .2-.3 amps from the normal .8 amps.

so i assume this means a new fan motor??

 

Thanks!

October 24, 2011
8:05 pm
refman
kent narrows, chesapeake bay
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October 23, 2011
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Great idea Steve  it will be a bit until i return to the boat.  i will let you know what i find  Thanks!!

October 24, 2011
7:18 am
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Steve Pooler
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What I would do first is bypass the Passport II circuit board & run the motor on straight power...Either from an extension cord, or by moving the fan wires on the Passport board over to incoming power...

This bypass should tell you if it's the motor, or the board that has a problem...Once we know that we can take it from there.

 

Steve~

October 23, 2011
10:28 pm
refman
kent narrows, chesapeake bay
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Members
Forum Posts: 5
Member Since:
October 23, 2011
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I have a Marine airr Model VCP16KHV  ser # A2-M09782   passport II digital control.

 

ran wonderful for 8 years factory installed by Regal. on my 3880.

today the system started normally after less than a minute of operation the evap fan motor began making a very loud buzzing noise, and the motor slowed to a very low RPM. kept operating compressor running, fan too slow to be effective, if i start over again same results, motor runs very free and free wheels a while after shutting off.

motor draws .8-.9 amps and when the buzz and low RPM occors it really does not increase or decrease the amp draw??

so what is happening? and why.

any advice on where to start now.

Thanks!