Open Daily: 10am - 10pm | Alley door pickup 10am - 7pm 3038 Hennepin Ave Minneapolis, MN
612-822-4611

  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
Heat Pumps Field Guide: Troubleshooting, Defrost Diagnostics, A2L Refrigerant Charging, Cold-Climate Sizing and Manual J for HVAC Technicians

Heat Pumps Field Guide: Troubleshooting, Defrost Diagnostics, A2L Refrigerant Charging, Cold-Climate Sizing and Manual J for HVAC Technicians

Lawson, Jd R.

Paperback

Technology & EngineeringGeneral Construction & Renovation

Currently unavailable to order

ISBN13: 9798177530338
Publisher: Independently Published
Pages: 314
Weight: 0.84
Height: 0.78 Width: 6.00 Depth: 9.00
Language: English
It's January. 11:47 pm. The outdoor coil is a block of ice, the pressures look fine, and the homeowner is watching you through the kitchen window.

You've been in HVAC for years. You know refrigeration. You know electricity. And right now you've got no idea what's wrong with this machine, because it's a heat pump and it doesn't behave like anything you were trained on.

That isn't a competence problem. It's a mental-model problem. Most techs learned on air conditioning, where heat moves one way. A heat pump reverses. That one fact changes how you read the gauges, which charging method is valid for the conditions, what a defrost failure looks like, and how you size the equipment in the first place.

Heat Pumps Field Guide rebuilds the model, chapter by chapter:

  • How a heat pump actually works in heating mode, including O vs. B wiring and the aux-heat settings that run up the bill
  • A2L refrigerants: R-32 vs. R-454B on the gauges, the tools that have to change, and the leak-detector shutdown that fakes a no-heat call
  • Refrigerant charge: which method applies, when, and why the weigh-in is the only honest answer in January
  • Manual J and Manual S sizing, and the cold-climate complication at design temperature
  • Defrost diagnostics: force a cycle, watch every component, find the sensor that lies
  • Reversing valve testing: electrical, mechanical, then internal leakage, before you cut anything out
  • Cold-climate systems: capacity data, balance point, dual-fuel changeover and lockouts
  • Ductwork: static pressure, airflow checks, and when ductless is the better answer
  • Inverter and communicating systems: DC bus safety, operating point first, fault codes as evidence
  • Selling the heat pump: rebates that still exist, operating-cost math, and a payback conversation that survives a skeptic
  • Commissioning and documentation that hold up when a dispute lands

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