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Old 10-10-2011, 01:40 PM   #1
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Dual Cap 35/25MDF 440VAC


I'm working on Trane ( TTN036C100A0 ). This dual capacitor on the part list call for Dual Cap 35/25MDF 440VAC round w/resistor. (CPT0622)

I never saw dual cap with this values, so I called trane and they confirmed .

I can't find this dual cap in any supplier.....what do you think?

PS: I can't read anything on the dual cap body
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Old 10-10-2011, 04:33 PM   #2
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Dual Cap 35/25MDF 440VAC


A dual capacitor is really 2 capacitors, use 2 capacitors for your unit.
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Old 10-10-2011, 05:20 PM   #3
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Dual Cap 35/25MDF 440VAC


I've never heard of a dual cap with those numbers either. 25 mfd is not a normal fan cap.

Take some pictures when you go back, JJBoy. Old and new.
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Old 10-10-2011, 05:37 PM   #4
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Dual Cap 35/25MDF 440VAC


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Originally Posted by Doc Holliday View Post
I've never heard of a dual cap with those numbers either. 25 mfd is not a normal fan cap.

Take some pictures when you go back, JJBoy. Old and new.
Look this DOC, very interesting. The starter kit is not installed, the the C-F part of dual capacitor is in series with start capacitor of the Starter Kit. There is not function for C-F at this time since there isn't not starter kit.
So I installed 35/5 dual capacitor using the 35MDF for the C-H.......system is working.......I'll try do get this 35/25mdf 440V
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Dual Cap 35/25MDF 440VAC-tranettn036c100a0.jpg  
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Old 10-10-2011, 05:49 PM   #5
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Dual Cap 35/25MDF 440VAC


Does it state on the fan motor it's a 5 mfd?
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Old 10-10-2011, 05:56 PM   #6
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Dual Cap 35/25MDF 440VAC


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Does it state on the fan motor it's a 5 mfd?

Yes, CF is 5mfd
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Old 10-10-2011, 06:43 PM   #7
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Dual Cap 35/25MDF 440VAC


It seems like you've got it covered, 35 on the herm and 5 for the fan so what's the 25 mfd for? I'm confused.
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Old 10-10-2011, 06:58 PM   #8
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Dual Cap 35/25MDF 440VAC


Is this a scroll compressor?
Maybe early 90's??
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Old 10-10-2011, 07:22 PM   #9
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Dual Cap 35/25MDF 440VAC


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It seems like you've got it covered, 35 on the herm and 5 for the fan so what's the 25 mfd for? I'm confused.
CR ( dual capacitor ) C-Fan (25mfd) goes to start kit (not installed) -
C-Herm (35mfd) goes to S compressor
Start kit has it own start capacitor.....so this system need 2 capacitor in series......


CF (run capacitor for fan) 5mfd.
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Old 10-10-2011, 07:25 PM   #10
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Dual Cap 35/25MDF 440VAC


So there's a start capacitor for the super boost capacitor in the hard start?
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Old 10-10-2011, 07:26 PM   #11
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Dual Cap 35/25MDF 440VAC


Quote:
Originally Posted by Master of Cold View Post
Is this a scroll compressor?
Maybe early 90's??
It's not scroll compressor (com3762), yes it's early 90's
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Old 10-10-2011, 07:33 PM   #12
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Dual Cap 35/25MDF 440VAC


Quote:
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So there's a start capacitor for the super boost capacitor in the hard start?
yes, I never saw configuration like that......the super boost looks like be in an individual board because there is a empty plug.

This compressor is running only with run capacitor....have being working fine for years,.....I can say this because I clean the condenser coil today.....was nasty.
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Old 10-10-2011, 07:35 PM   #13
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Dual Cap 35/25MDF 440VAC


Looks like 60mfd is supplied to compressor S when the contactor is engaged.
Start kit red is parallel, so it is only Run.

Cap H and F serve as R(common) and C serves as H (start)

I wonder if 60uF caps were uncommon in the early 90's...

Last edited by Houston204; 10-10-2011 at 07:40 PM.
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Old 10-10-2011, 07:56 PM   #14
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Dual Cap 35/25MDF 440VAC


This is the wiring diagram that the AC is working. Again the schematic calls for dual capacitor 35/25mfd 440V....I replaced for 35/5mfd 440v because there is not start kit so the system doesn't need C-F of the dual capacitor.
Trane confirmed 35/25mfd 440V dual capacitor value.....I can't find anywhere

http://img42.imageshack.us/img42/987...n036c100a0.jpg
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Last edited by JJboy; 10-10-2011 at 08:01 PM.
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Old 10-10-2011, 08:02 PM   #15
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Dual Cap 35/25MDF 440VAC


It serves as a 60 uF cap, it needs both or you will overamp.

That red wire to the start kit is parallel with run, so it will not be affected by the run cap.

Run is feeding H and F and C serves as start (herm).
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