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Robertshaw 300-224 Installation And Programming Instructions page 39

300 series deluxe programmable thermostats
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TWO TRANSFORMER SYSTEM
If the fault indicator is ON the transformers are out of phase. Switch the secondary wires of one
of the transformers (NOT BOTH) and ensure the red light goes OFF.
Separate RH and RC Wires
Single RH/RC Wires
39

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300-226300-225300-227300-230300-229

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