Question about Beverage-Air Beverage Air KF24-IAS 20.7 Bottom Mount Freezer

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I printed out the KF24 pictoral diagram and had to draw a ladder diagram for our HVAC training course in order to troubleshoot the system in the lab. In trying to rectify the Evaporator Defrost heater circuit to the pictoral I ran into two problems. First, assuming that white was the power wire, I drew the heater circuit backwards (controls were on the assumed "neutral" side), but they were controlling the heating circuit while leaving the Drain tube heater energized all the time (that is the only correct part of the first drawing). However, when I tried to draw it the correct way with black as power, it created an inverse situation of the first drawing (though the controls were on the power side this time). The controls were now in parallel with the Defrost heater. Wait... now that I look at it both of my drawings show that the controls are in parallel with the defrost heater because after power passes through the first load (opposite for each drawing) it has the choice of stopping at the N/O defrost timer switch or branching of to the D. tube heater and the completing the circuit. This would indicate power to the Defrost heater all the time. What am I doing wrong. Sincerely, Michael

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First try putting controls in series with loads. Remember, loads consume power and switches pass power. Start here. If I had a copy of your drawings, I'd be in a better position to address your situation.

Posted on Jan 15, 2011

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Posted on Jan 02, 2017

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