Refrigerant handling: Furnace tips

Short, practical technician tips on refrigerant handling for furnace. Check each one against the manual for your exact model before acting.

Belt tension & alignment

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Snug not tight; tightest belt that doesn't slip under full load, measured with a tension gauge; shafts parallel AND grooves in line (laser tools exist). Misalignment overloads the motor.

Concentric vent kit

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One wall penetration for intake and exhaust on condensing appliances; keep PVC joints leak-tight, use a termination kit, protect condensate from freezing.

Water leak → electrical shorts

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Leaking evap coil or humidifier above the furnace is a common cause of board failures.