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Jerry
Jerry, HVAC Technician
Category: HVAC
Satisfied Customers: 422
Experience:  Epa universal certification, hearth products specialized.
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I have just bought a Honeywell st9400c tonswap for an older

Customer Question

Hi, I have just bought a Honeywell st9400c tonswap for an older version that no longer working. Old unit has 2 wires a L and N however this unit has more. Do I need to link the L or N tonoher terminals
Submitted: 3 months ago.
Category: HVAC
Expert:  Airheatman replied 3 months ago.

The L and N are power line voltage wires so they will only go to L and N on new. What is model on old programmer and what other terminals were used?