SSL Mid-Century AC Compressor Replacement Case Study

South Salt Lake Mid-Century Home AC Compressor Replacement

Customer:
Theresa P. (consent for documentation given)
Address area:
South Salt Lake, near 3300 South and 700 East — established mid-century residential neighborhood
Home characteristics:
1959 mid-century ranch, approximately 1,540 sq ft single-story on full basement. Original brick exterior with horizontal siding accents on the entry facade. Original casement aluminum-frame windows replaced 2008 with vinyl double-pane. Drywall on partition walls, original lath-and-plaster on exterior walls. Concrete slab basement floor with finished living area on half the basement. Standard mid-century South Salt Lake home representative of the State Street corridor housing stock.
Project type:
AC compressor replacement on aging system — customer evaluating full equipment replacement vs. component-level repair
Project completion date:
July 18, 2024
Total cost:
$3,400 installed (compressor replacement + matched evaporator coil + R-410A refrigerant conversion). No rebates available for component-level repair work.

Background

Theresa P. has owned this home since 2011 (13 years at time of project). The 2008 Bryant 113A AC was original to her purchase; the matched 2008 Bryant furnace remained in operation. Theresa called us on July 16, 2024, during a 99°F afternoon. Her AC had stopped cooling 4 hours earlier; indoor temperature had risen to 86°F. Initial dispatch confirmed compressor failure on the 2008 Bryant condenser. This case study documents the diagnostic process, the repair-vs-replacement decision, and the compressor replacement work that followed.

Existing Equipment

AC condenser (failed component — compressor replaced):
2008 Bryant 113A 2-ton split system AC condenser. Model 113ANA024. 13 SEER (pre-SEER2 rating). R-22 refrigerant (original 2008 production). 16 years service at time of failure — approximately mid-life for a residential AC compressor. Located on east side of home on concrete pad. Atmospheric exposure typical for South Salt Lake (PCAPS inversion exposure, occasional snow accumulation).
Evaporator coil (replaced concurrently):
2008 Bryant A-coil matched to original condenser. Located atop 2008 Bryant 80% AFUE furnace in basement. Decision to replace evaporator coil with compressor (rather than retain): R-22 to R-410A conversion incompatibility — old coil designed for R-22 pressure/oil compatibility; new R-410A compressor required new matched coil.
Furnace (retained):
2008 Bryant 80% AFUE furnace, 60,000 BTU/hr input. Located in basement utility area. Operating well within manufacturer specifications. 16 years service, approximately mid-life for residential furnace. No replacement needed.
Refrigerant lines:
2008 copper lineset, 30 ft length from outdoor condenser through east foundation wall to basement furnace. Lineset compatibility with R-410A: existing copper lines suitable for R-410A pressure, but flush required to remove residual R-22 oil before R-410A introduction.
Thermostat:
2008 Honeywell programmable thermostat. Operating well. No replacement needed.
Filtration:
1-inch MERV 8 filter at return air. Replaced during routine maintenance.

Diagnostic Process (July 16, 2024)

Initial dispatch:
Eli Tran responded same afternoon, on-site by 3:45 PM (95 minutes from call — standard same-day dispatch). Theresa explained the AC had been running fine that morning, stopped cooling around 11 AM, and the outdoor unit was running constantly without cooling effect.
Initial assessment:
  • Outdoor condenser fan operating normally
  • Compressor humming but not pumping refrigerant (audible compressor “lock” rather than smooth operation)
  • Outdoor disconnect verified closed; 240V supply confirmed at compressor terminals
  • Compressor start capacitor tested: 65 MFD reading (within spec for 60 MFD nominal +/- 6%)
  • Compressor run capacitor tested: within spec
  • Compressor windings tested: shorted compressor windings identified (motor-to-ground continuity should be infinite; measured 4.2 ohms = internal short)
Diagnosis confirmed:
Compressor failure due to internal motor winding short. Common failure mode for residential AC compressors after 12-18 years of service. Not repairable; compressor replacement required.
Refrigerant pressure check:
System static pressures normal (suction 110 PSI, liquid 240 PSI — consistent with non-operating system at outdoor temperature 99°F). No leak indication. R-22 charge remained in system.
Refrigerant level assessment:
R-22 charge estimated at 4.5 lbs (manufacturer specification for 2-ton system at lineset length). No additional charge needed if simply replacing compressor with another R-22 unit. However, compressor replacement parts increasingly available only as R-410A-compatible models due to R-22 phase-out.

Decision Framework

Repair options evaluated:
  1. R-22 compressor replacement (same refrigerant): $1,800 compressor (R-22 compatible, increasingly limited inventory) + $185 R-22 refrigerant retention + $640 labor = $2,625. Continues R-22 operation; future leaks require expensive R-22 refrigerant ($120-160/lb). Maintains existing R-22 evaporator coil. Service life limited by overall system age.
  2. R-410A compressor + matched coil replacement (selected option): $1,200 R-410A compressor + $640 matched R-410A evaporator coil + $185 lineset flush + $245 R-410A refrigerant (4 lbs at $40-50/lb) + $1,130 labor = $3,400. R-22 reclamation included. Modern R-410A operation; future leaks repaired at much lower refrigerant cost. New matched coil extends evaporator life.
  3. Full AC replacement: $9,800-$11,400 installed for new 2-ton 16 SEER2 AC + matched coil. 18-year warranty period. Newest efficiency tier. But: existing 2008 furnace doesn’t need replacement, and replacing entire AC means abandoning still-functional 2008 condenser cabinet/fan/electronics for a 1-component failure.
  4. Heat pump conversion: $18,400-$24,800 for heat pump + matched air handler. Eliminates need for separate furnace. But existing 2008 furnace is still functional; replacing it as part of heat pump conversion doesn’t make economic sense for this customer’s situation.
Customer selection:
Theresa selected Option 2 (R-410A compressor + matched coil conversion). Reasoning: (a) $3,400 cost is reasonable for repair that extends equipment life 8-12 years; (b) R-410A conversion eliminates future R-22 refrigerant cost exposure; (c) full AC replacement at $9,800-11,400 not justified when other system components are functional; (d) heat pump conversion not appropriate given existing functional furnace.

Equipment Specifications

Replacement compressor:
  • Copeland Scroll ZR24K5E-PFV-130 (2-ton capacity, R-410A compatible, scroll compressor)
  • Direct retrofit compatible with Bryant 113A cabinet
  • 5-year manufacturer warranty on compressor
  • Compatible operating pressures with R-410A refrigerant
Replacement evaporator coil:
  • Bryant CNPHP3624 (matched 2-ton coil for replacement compressor)
  • R-410A compatible (copper tubes, aluminum fins)
  • Direct fit replacement for 2008 Bryant A-coil dimensions
  • 10-year warranty on coil
Refrigerant:
R-410A. 4.0 lbs (factory charge per Bryant CNPHP3624 + Copeland ZR24K5E specifications for the lineset length).
Capacitor:
Replaced compressor start capacitor with new 60 MFD 370V (replacing existing 16-year-old capacitor at end of service life). Preventive replacement during compressor service to avoid future failure.
Lineset:
Existing 2008 copper lineset retained. Flush procedure: nitrogen flush followed by R-410A-compatible flushing solvent to remove residual R-22 mineral oil. R-22 lineset oils incompatible with R-410A POE oils and can cause early compressor failure if not flushed.

Installation Scope and Timeline

July 16, 2024 (diagnostic dispatch):
Eli Tran on-site 3:45 PM. Diagnostic complete by 4:30 PM. Customer received repair options analysis by 5:15 PM. Theresa requested 24 hours to consider options.
July 17, 2024 (decision):
Theresa authorized Option 2 (R-410A conversion) by phone at 10:00 AM. Parts ordering: Copeland compressor and Bryant coil scheduled for delivery July 18, 2024.
July 18, 2024 (installation day):
  • 8:00 AM: Eli Tran and Marcus Halverson arrived. Equipment delivered.
  • 8:30 AM: R-22 reclamation per EPA Section 608. Approximately 4.2 lbs recovered (slightly below original 4.5 lbs charge, consistent with normal slow leak over 16 years).
  • 9:00 AM: Existing compressor removal. Brazed connections cut, compressor lifted out of cabinet, electrical disconnected.
  • 10:00 AM: Existing evaporator coil removal from furnace cabinet in basement. Brazing connections cut, coil lifted out.
  • 10:45 AM: Lineset flush procedure. Nitrogen high-pressure flush, R-410A-compatible flushing solvent, second nitrogen flush. Lineset oil-free for R-410A compatibility.
  • 12:00 PM: Lunch break.
  • 12:45 PM: New compressor installation. Brazing connections to existing copper lineset.
  • 1:30 PM: New evaporator coil installation in furnace cabinet. Brazing connections to lineset.
  • 2:30 PM: New start capacitor installation.
  • 2:45 PM: System pressure test (300 PSI nitrogen for 30 minutes). No leaks identified.
  • 3:15 PM: System evacuation. 24-hour deep vacuum to under 250 microns — equipment left running with vacuum gauge for cure period.
  • 4:00 PM: Initial check of vacuum: 180 microns reached. Charge initiation.
  • 4:30 PM: R-410A refrigerant charge by weight (4.0 lbs precise factory specification).
  • 5:00 PM: System startup and verification. Cooling mode operation verified across multiple cycles.
Commissioning measurements (after installation):
  • Subcooling: 9°F (Bryant specification: 7-12°F)
  • Superheat: 13°F (Bryant specification: 10-15°F)
  • Suction pressure: 132 PSI (R-410A normal cooling mode at 95°F outdoor)
  • Liquid line pressure: 412 PSI (R-410A normal)
  • Supply air temperature differential: 19°F (excellent for 2-ton R-410A system)
  • Refrigerant charge: 4.0 lbs R-410A confirmed
  • Indoor temperature recovery: Theresa’s home reached 75°F (from 86°F starting) by approximately 7:00 PM same day
AHJ inspection:
Not required for component-level replacement (compressor + coil). EPA Section 608 refrigerant handling documented in service report. Not equipment replacement requiring permit.

Cost Breakdown

Itemized project cost:
  • Copeland ZR24K5E-PFV-130 compressor: $1,200
  • Bryant CNPHP3624 matched evaporator coil: $640
  • R-410A refrigerant (4.0 lbs at $50/lb): $200
  • R-22 reclamation (4.2 lbs recovered per EPA Section 608): $185
  • Lineset flush (nitrogen + R-410A-compatible solvent): $185
  • 60 MFD 370V start capacitor: $35
  • Brazing materials and supplies: $85
  • Installation labor (Eli Tran + Marcus Halverson, 9 hours combined): $980
  • System commissioning (pressure test, evacuation, charge, verification): $185
  • Subtotal: $3,695
  • Existing customer discount (15% applied as Theresa is a long-term customer): -$295
  • Total customer cost: $3,400 installed
Note on discount:
Theresa was not enrolled in Comfort Care plan at time of service. The 15% discount was applied as long-term customer loyalty discount (customer since 2018 with annual tune-ups). She enrolled in Comfort Care plan immediately post-project to receive plan benefits going forward.
Rebates and incentives:
  • Rocky Mountain Power Wattsmart: not applicable (covers equipment replacement, not component repair)
  • Federal IRA 25C: not applicable
  • Dominion Energy: not applicable
Comparison to full AC replacement alternative:
Full 2-ton 16 SEER2 AC replacement would have cost $9,800-$11,400 installed. Customer saved $6,400-$8,000 by choosing component-level repair. Trade-off: existing 2008 condenser cabinet retained (rather than new equipment with full warranty). For Theresa’s specific situation with otherwise-functional system components, component-level repair was the more economical choice.

Post-Project Outcomes

Summer 2024 performance (partial season, post-installation):
  • Cooling restored to design specifications — home maintained 72-75°F throughout July-August 2024
  • Electric bill comparison: -$15/month average reduction July-August 2024 vs. previous summer (R-410A operating efficiency slightly better than aging R-22 system in last year of service)
  • No issues with system operation post-installation
Summer 2025 performance (full season comparison):
  • Cooling performance excellent across summer 2025
  • System operating at design specifications
  • Electric bill comparison: -$22/month average July-August 2025 vs. summer 2023 (last full season with original R-22 system)
  • No service calls between installation and 2025 spring tune-up
Customer-reported assessment:
Theresa reported satisfaction with the repair-vs-replacement decision: “I wasn’t ready to spend $10,000 on a new AC, and the explanation of why compressor replacement made sense for my situation was clear. The system has been working perfectly since.”
Ongoing service relationship:
Theresa enrolled in Comfort Care plan immediately post-project. Annual tune-ups (spring AC + fall furnace) scheduled. 5-year compressor warranty on Copeland ZR24K5E. 10-year warranty on Bryant CNPHP3624 evaporator coil. Service relationship continues.
System service life projection:
With component replacement, the 2008 Bryant condenser cabinet, fan motor, and electronics continue in service. Expected remaining service life on those components: 6-10 years. Compressor warranty: 5 years. Coil warranty: 10 years. Practical full system replacement timing: 2030-2034 based on component aging patterns. Theresa has flexibility on replacement timing rather than emergency forced replacement.

Why This Case Study Illustrates Important Patterns

Component-level repair vs. full replacement decision-making:
Not every AC failure requires full replacement. Many customers default to “the AC broke, time for a new one” thinking without considering whether specific component repair is the better economic choice. When other system components are functional and within remaining service life, component repair can save 60-70% of full replacement cost. Theresa’s case illustrates this analysis.
R-22 to R-410A conversion economics:
R-22 phase-out completed 2020 makes R-22 refrigerant increasingly expensive ($120-160/lb vs R-410A at $40-50/lb). When components need replacement on R-22 systems, R-410A conversion (compressor + matched coil + lineset flush) eliminates future R-22 cost exposure. Initial conversion cost is higher than same-refrigerant component replacement, but eliminates ongoing R-22 risk and improves system efficiency.
Lineset flush importance:
R-22 mineral oils are incompatible with R-410A POE (polyolester) oils. Mixing the two oils can cause: copper plating from chemical reactions, oil acid formation, and early compressor failure. Proper R-410A conversion requires lineset flush to remove residual R-22 oil. Skipping this step is a common error in DIY or unprofessional conversions and leads to compressor failures within 1-3 years.
Compressor failure pattern recognition:
Internal compressor winding shorts (motor-to-ground continuity below infinite) is a definitive failure that cannot be repaired. The compressor must be replaced. Distinguishing this failure mode from other compressor symptoms (locked rotor, low refrigerant simulation, overheating) requires proper electrical diagnostic. Compressor humming but not pumping refrigerant is often misdiagnosed as “low refrigerant” when actual cause is internal compressor damage.
Long-term customer loyalty discount:
Theresa wasn’t enrolled in Comfort Care plan at time of failure but had been a customer since 2018 with annual tune-ups. Loyalty discount (15%) applied during repair, comparable to plan discount level. Theresa enrolled in Comfort Care plan post-project to receive ongoing plan benefits. This pattern illustrates the value of long-term customer relationships even outside formal plan enrollment.
EPA Section 608 compliance:
R-22 reclamation during compressor replacement is required by EPA Section 608. Releasing R-22 to atmosphere is illegal and environmentally harmful. Documentation of reclaimed quantity (4.2 lbs in this case) maintained in service records. Lead technicians require EPA 608 Universal certification (Eli Tran certified, certificate #608U-2009-447129 listed for the lead tech).

Code and Standards Compliance Documentation

Applicable codes and standards:
  • EPA Section 608: Refrigerant handling and reclamation (R-22 reclamation, R-410A introduction)
  • 2024 IMC with Utah amendments: Mechanical equipment service
  • NEC Article 440: Air-conditioning and refrigerating equipment
  • ASHRAE 15: Safety standard for refrigeration systems (informational reference)
  • Utah DOPL HVAC contractor licensing: #11567823-5501 active and current
Permit:
Not required for component-level replacement in South Salt Lake jurisdiction. Equipment replacement (full condenser unit replacement, for example) would require permit; component repair (compressor + coil within existing equipment) does not.
Documentation maintained:
R-22 reclamation records, lineset flush documentation, evacuation cure period documentation, refrigerant charge by weight, commissioning measurements, customer authorization for scope.

Frequently Asked Questions

Should I always replace the entire AC instead of just the compressor?
Depends on system age and component condition. General guidance: (1) System under 8 years old: component repair almost always economical; (2) System 8-15 years old: case-by-case analysis based on which components are failing and how others are aging; (3) System over 15 years old: full replacement often makes more sense unless other components are exceptional. Theresa’s 2008 system at 16 years had a single component failure (compressor) with otherwise-functional cabinet, fan, and electrical. Component repair was economically rational.
What’s the difference between R-22 and R-410A?
R-22 was the dominant residential AC refrigerant from 1950s to 2010s. EPA phase-out completed 2020 due to ozone depletion potential. R-22 is no longer manufactured; existing supply is from reclamation, expensive ($120-160/lb). R-410A replaced R-22 as the dominant residential refrigerant. Different operating pressures and oil chemistry. Components designed for R-22 are not compatible with R-410A without conversion (matched evaporator coil, lineset flush, compressor matched to refrigerant type).
Why is lineset flush important?
R-22 systems use mineral oil in compressor. R-410A systems use POE (polyolester) oil. Mixing these oils causes chemical reactions: copper plating from acid formation, oil sludge, and accelerated compressor wear. Conversion from R-22 to R-410A requires removing all residual R-22 mineral oil from the lineset before introducing R-410A. Standard procedure: nitrogen flush, R-410A-compatible flushing solvent, final nitrogen flush. Skipping flush leads to compressor failure within 1-3 years.
How long should my AC compressor last?
Typical residential AC compressor service life: 12-18 years with proper maintenance. Factors affecting compressor life: refrigerant charge accuracy, lineset cleanliness, voltage stability, ambient temperature exposure, compressor start frequency. Theresa’s 16-year compressor was within normal service life range when it failed. Annual maintenance (tune-ups) extends compressor life by keeping refrigerant charge correct, contactor working, and electrical connections clean.
Should I have replaced the furnace at the same time?
Considered but not necessary. The 2008 Bryant furnace was operating well within manufacturer specifications. 16 years on a residential furnace is mid-life (typical service life 18-22 years). Replacing functional equipment based on its age alone is not economically rational. Theresa retained the existing furnace; future replacement decision will be made when the furnace shows actual signs of end-of-life rather than presumptively replacing it during a separate AC repair.

Project Details Summary

Customer:
Theresa P. (consent for documentation given; customer since 2018)
Property:
South Salt Lake 1959 mid-century ranch, 1,540 sq ft on full basement, established State Street corridor neighborhood
Project:
AC compressor replacement with concurrent R-410A conversion (matched evaporator coil + lineset flush)
Completion date:
July 18, 2024 (single-day installation)
Total cost:
$3,400 installed (with 15% long-term customer loyalty discount)
Equipment installed:
Copeland ZR24K5E-PFV-130 2-ton scroll compressor (R-410A), Bryant CNPHP3624 matched 2-ton evaporator coil, new 60 MFD 370V start capacitor
Outcome:
System restored to design specifications. -$22/month electric bill reduction summer 2025 vs. summer 2023 (last full R-22 system year). Customer satisfaction with repair-vs-replacement decision. 6-10 year projected remaining service life on other system components allows flexible future replacement timing.
Ongoing service relationship:
Comfort Care plan member from post-project enrollment. Annual tune-ups continuing. 5-year compressor warranty + 10-year coil warranty active.

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