Need help wiring single source water heater...

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  #1  
Old 06-15-13, 08:46 AM
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Need help wiring single source water heater...

I have a CEC 110/120 Volt 3400 Watt Single source water heater that I can not figure out how to wire. The wiring lug has an L1 L2 and GR. The L1 has a red wire leaving and the L2 has a blue wire leaving the lug. I now this is a common 220 Volt connection, but since this heater says 110/120 Volt how should I wire this unit?
Thanks Patnd2
 
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Old 06-15-13, 09:03 AM
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How do I post pictures to this thread?
 
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Old 06-15-13, 09:05 AM
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Welcome to the forums.

I don't recognize the CEC company but if that unit is indeed a 3400 watt unit..... and it was operated on 120 volts it would require 29 amps. Pretty unusual load for 120 volts.

If it is labeled L1 and L2 it would appear to be 240 vac only. Did it come with a wiring diagram ?

Can you leave a link to the unit ?


On edit:
CEC=controlled energy corp. Seems to be Bosch now. I see a model listed like yours....called the RP-3 and it does require 120 volts @ 30 amps.
 

Last edited by PJmax; 06-15-13 at 09:10 AM. Reason: further info
  #4  
Old 06-15-13, 09:12 AM
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I would have to agree with you on the 220 V. Not sure why the tag would say 110/120. I tried to look up the name and even call the number on the unit with no luck.
 
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Old 06-15-13, 09:13 AM
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Use the "go advanced" reply screen. Scroll down until you see manage attachments. Click on "manage attachments" and then you can select your picture.
 
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Old 06-15-13, 11:01 AM
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Branch circuits for tank-type water heaters need to be designed to 125% of the actual load.

That means for a 3400 watt, 120 volt heater you would need a minimum of a 35.42 ampere branch circuit. That would require at least #8 copper wire. You could probably get by with a 35 ampere circuit breaker but an inspector that is a real stickler for the book might require a 40 ampere circuit breaker. Truth is, many manufacturers don't even make a 35 ampere circuit breaker.

Do NOT assume that the heater is 240 volts, especially if the nameplate lists 120 volts. Open the element access panels and look on the element itself for a voltage rating.
 
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