D.M HVAC & Refrigeration LLC.

D.M HVAC & Refrigeration LLC. We offer Comercial, Residential Air Conditioning, Refrigeration and construction Services, Lic #: CAC1820802 , Certified Building Contractor CBC1268026

07/06/2026
07/06/2026
05/22/2026

115 Ton Diagnostic: Chain Faulted.
First things first is confirming my HPCO are closed. Next I will make sure the compressor modules have 0 ohms across M1 and M2. (These two terminal go to a Thermal overload/thermistor)
You should check the first module in series, in my video I confirmed my first module is good and I followed up to my second module in series. And I check to make sure M1 & M2 are giving me 0 ohms. (closed thermal overload)
Since my second module did not give me 0 ohms and instead gave me OL (open line) I need to confirm now if the Module itself is faulty or compressor internally is open on thermal overload.
Lastly I jump my wires that were hooked to M1&M2 to simulate the closed thermal overload and monitor the compressors amps and sound.

05/22/2026

You can’t remember how these defrost time clocks work.
Let’s keep it simple:
1 and 2 = L1 line voltage
N = Neutral or L2 line voltage
3 = Defrost (NO contact)
4 = Evap fans (NC contact)
X = Defrost termination

05/22/2026

Lennox RTU needs a new compressor

Address

7588 Glenmoor Lane
Winter Park, FL
32792

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm
Saturday 9am - 12pm

Telephone

+12104618005

Website

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