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Lennox VRF dual fuel system control and outdoor unit defrost issue

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BRogersNV
BRogersNV Member Posts: 1
in A-C, Heat Pumps & Refrigeration

I have a dual fuel ducted heating system for a 2500 sq ft home in northern NV. The equipment:

  • Lennox VRF heat pump VPB060H4M-3P outdoor unit, C35 indoor coil
  • Lennox Gas Furnace ML180DFE (propane)
  • Nest Thermostat

My issues/needs: The 2 HVAC companies near me have not been able to fix these problems

  • The outdoor unit freezes hard when demanding a lot of heat (sometimes vibrates and shudders before the system decides to defrost)
  • When I try to fore the furnace to come on by turning up the thermostat by 10-degrees, it does not come on (I was told this is a work around)
  • Given my cost of electricity vs propane (I have PEV panels) it makes way more sense for me to run the heat pump down to 10 degrees outside temp
  • I want a thermostat which allow me to manually switch between heat pump and gas furnace and ideally let me change the balance point (I know I can do this on the outdoor unit).

I've been told there's no way for me to manually control what I have — even with a new Lennox thermostat? Why does it defrost properly sometimes but not always?

I'm very handy person and could install a new thermostat, flip din switches in control boxes, etc. to DIY a fix because the pros around here are nice but not helping. Help please!

Comments

  • pecmsg
    pecmsg Member Posts: 6,869

    I believe that unit has a communicating T Stat so a standard will eliminate many features.
    have your service contractor contact leonnex technical support while on site.

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