Help on wiring an old temperature controller

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  #1  
Old 10-12-15, 11:01 AM
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Help on wiring an old temperature controller

Hi! I have recently purchased an old Fenwal Model 551 Temperature controller. It has a sticker on it saying it can be set for 240, 208, and 120 VAC. I can't find the installation manual online and i don't feel like breaking it by guessing. Could use some help determining what each contact is for. I am from Canada Ontario so 120v input is what i am looking to select.

The only thing i could find is a feature info .pdf for it: http://mediaserver.voxtechnologies.c...6277544001.pdf

I am assuming that the C L H is for cooling load and heat? and maybe the 1 and 2 for the termocouple.



Thank you for your time!
 
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Old 10-12-15, 11:41 AM
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Welcome to the forums.

L1 and L2 are power in.
T1 and T2 are for the remote temperature sensor.
1 and 2 are ??
C = common
L = low (N/O)
H = high (N/C)

As far as converting to a different operating voltage.... open it up and it should be easy to locate since it's sold as "field changeable".
 
  #3  
Old 10-12-15, 12:25 PM
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Thanks a ton! that explains a lot and taking a look inside, 1 and 2 are not connected to anything anyway.

looking at the module inside, i'm assuming that it's a 240VAC that i'm set for?


KUP-5D15-24 TE CONNECTIVITY / POTTER & BRUMFIELD | Power - General Purpose Relays | Newark element14 Canada
 
  #4  
Old 10-12-15, 12:31 PM
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No...it's not set to 240v. It looks to be set at 120v.

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The black wire connects to the proper voltage pin.
 
  #5  
Old 10-12-15, 12:47 PM
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thank you! you've made my day! time to start building my temperature controller now.
 
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