McDonnell & Miller 349500 Hook-Up 30067439-890 Reduced Callbacks: Improves troubleshooting accuracy
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McDonnell & Miller 349500 Hook Up 30067439 890 Reduced Callbacks: Improves troubleshooting accuracy Reduced Callbacks: Improves troubleshooting accuracy it is commonly utilized in dual fuel (hybrid) applications to lockout the furnace until the outdoor temperature drops below the heat pump's effective operating range