Circuit breaker issue - walkin cooler


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Old 07-03-12, 03:02 PM
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Circuit breaker issue - walkin cooler

have a walkin refrigerator and the circuit breaker relating to the evaporator/fan trips occassionally. separate compressor circuit breaker does not trip.

the compressor is located in a poorly overheated area on top of cooler


is there a chance that the evaporator/fan circuit breaker is shutting down due to excessive heat generated by the compressor?? i.e to protect the compressor? what would cause the circuit breaker to trip (amp capacity on circuit breaker is fine)

(ie. area where compressor is located gets as hot as 115 degrees continually due to no ventilation) - manuf says temp should be under 90.

thanks
 
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Old 07-03-12, 05:00 PM
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The circuit breaker is there to protect the circuit wiring. The motor should be protected by some other protection like internal thermal protection or fuses. Heat dose not normally cause a breaker to trip unless the breaker itself is subjected to the high heat. You said the amp capacity is fine but you do not give a number.

What is the amp rating of the breaker and how many amps are being drawn? (Take a reading with a clamp on meter) Is the a single phase or three phase motor/cooler?
 
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Old 07-03-12, 06:43 PM
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clean the condenser coil. if it is plugged it will cause the compressor to pull more amps.
 
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Old 07-04-12, 08:00 AM
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evaporator/fan - fuse problem

thanks

the evaporator/fan circuit is separate from the compressor circuit

if the evap fins are dirty (havent been cleaned for yrs) would this cause fan to draw more amps and then cause breaker to trip?

it is a 20 amp breaker (has been replaced so the breaker is likely OK) and the evap/fan is 1 phase (115 v) and a 1/15 HP motor so the breaker seems plenty big enough
 
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Old 07-04-12, 09:17 AM
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Condenser fan inop or coil plugged. Not evap... condenser
 
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Old 07-04-12, 09:50 AM
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hi, thanks
but the compressor circuit breaker is OK

its the circuit breaker for the evaporator that occasionally trips.

would a dirty evaporator be causing a breaker problem?
 
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Old 07-04-12, 09:52 AM
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Not likely..................
 
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Old 07-04-12, 10:30 AM
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Do you have a line voltage thermostat controlling this?
Is it getting wet?
 
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Old 07-04-12, 10:54 AM
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electr diag for evaporator and compressor

included in post above is the electrical schematic for the evaporator (on right) - appears the temp control is line voltage

i see the temp probe sticking out from the wall of unit on the inside

how/why would thermostat control be getting wet? thanks
 
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Old 07-04-12, 11:07 AM
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electrical diagram

attached is elect diagram for the evaporator on right
 
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