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  1. Thank you for all the useful replies. I still am...

    Thank you for all the useful replies. I still am skeptical that the lubricant injection will permanently fix the malfunctioning TXV. With my luck the TXV will break again the day that the warranty...
  2. Malfunctioning thermostatic expansion valve (TXV) in new Carrier AC

    Last fall a professional HVAC contractor installed a new Carrier 4 ton condenser and 4 ton evaporator coil. I ran it for the first time this spring and the coils froze. The HVAC contractor...
  3. Thank you comfortdoc. I appreciate the...

    Thank you comfortdoc. I appreciate the clarification.
  4. Thanks again for all the useful advice!

    Thanks again for all the useful advice!
  5. Thanks for the response, however I'm still...

    Thanks for the response, however I'm still confused since the Carrier website states that the Cor thermostat is "Compatible with 3-zone panel systems: ZONECC3ZHP01 and ZONECC3ZAC01"...
  6. Carrier Cor thermostat with 3 zones - 3 Cor or 1 Cor + 2 smart sensors

    I have a 3 zone system and plan on having a professional contractor install a Performance level Carrier oil furnace and Performance level Carrier air conditioner (probably 1 stage). I plan to get...
  7. Thank you for all of the useful advice!

    Thank you for all of the useful advice!
  8. Manual J vs. rule of thumb (tons per square feet), oil burner brand, bypass dampers

    Hello - I'm planning to replace my residential oil furnace and air conditioner. I've seen many posts regarding how the rule of thumb of X tons per square feet is basically worthless, and that a...
  9. Oil furnace, limit switch triggering, poor air flow? (Continued)

    I appreciate all the replies so far, however I'm still confused and would appreciate anyone who can clarify the situation. I am using a professional HVAC contractor and was hoping to get a second...
  10. Thanks for your replies. I don't know what...

    Thanks for your replies. I don't know what calculations were done to determine the correct size furnace for the house. It seems like it would need a decent size furnace, since it heats a 3,500...
  11. Oil furnace, limit switch triggering, poor air flow?

    Hi,

    I have a Lennox 023Q5-140 oil furnace, with forced air, which is approx. 10 years old. Lennox told me that it is a 5 Ton 2,000 CFM unit.

    Last year the heat stopped and the mechanic...
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