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Day & Night Gas furnace *80CSU0802120B*

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Day & Night Day & Night AHRI Furnace - Ion 80 Ultra Low NOx Gas Furnace Gas furnace Repair, maintenance, and replacement planning
Day & Night *80CSU0802120B* product image

Technical Specifications

Product Specs

  • AHRI unit role: Furnace
  • AHRI model/pattern: *80CSU0802120B*
  • AHRI records represented: 151
  • AHRI equipment type: Central HP
  • AHRI tonnage: 2.9
  • AHRI refrigerant: R-454B
  • Verified catalog model: *80CSU0802120B*
  • Verified product family: Ion 80 Ultra Low NOx Gas Furnace
  • Verified catalog brand: Day & Night
  • Verified model family: F80CSU
  • AHRI model/pattern: *80CSU0802120B*
  • Nominal input: 80,000 BTU/h input
  • AFUE family: 80%
  • Heating stages: single-stage
  • Blower: variable-speed
  • NOx classification: ultra-low NOx
  • Cabinet width code: 21
  • Application: matched gas furnace for split-system air conditioner or heat pump combinations
  • Official product page: https://www.dayandnightcomfort.com/en/us/products/gas-furnaces/ion-80-ultra-low-nox-gas-furnace

Useful troubleshooting details

  • Confirm the installed model and serial number, matched indoor or outdoor equipment, voltage, refrigerant, controls, and AHRI certificate before service or replacement planning.
  • Use the linked AHRI certificates to verify matched-system combinations, rebate conversations, and equipment eligibility before quoting replacement work.
  • Collect photos of the nameplate, equipment access, recent fault history, and comfort symptoms before dispatch or proposal planning.

Certification match

AHRI certificates

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Eligible Central HP <5.4 tons

AHRI 217909453

AHRI 217909453 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit N5H9V36*K*AAA* and indoor unit EVM5X43M21A*.
Eligible Central HP <5.4 tons

AHRI 217909460

AHRI 217909460 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit Q5H9V36*K*AAA* and indoor unit EVM5X43M21A*.
Eligible Central HP <5.4 tons

AHRI 217910372

AHRI 217910372 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit N5H9V36*K*AAA* and indoor unit EVM5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217910379

AHRI 217910379 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit Q5H9V36*K*AAA* and indoor unit EVM5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217911553

AHRI 217911553 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit N5H9V36*K*AAA* and indoor unit EVD5X36M21A*.
Eligible Central HP <5.4 tons

AHRI 217911560

AHRI 217911560 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit Q5H9V36*K*AAA* and indoor unit EVD5X36M21A*.
Eligible Central HP <5.4 tons

AHRI 217914139

AHRI 217914139 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit N5H9V36*K*AAA* and indoor unit EVD5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217914146

AHRI 217914146 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit Q5H9V36*K*AAA* and indoor unit EVD5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217914968

AHRI 217914968 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit N5H9V48*K*AAA* and indoor unit EVM5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217914973

AHRI 217914973 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit Q5H9V48*K*AAA* and indoor unit EVM5X48M21A*.
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Service planning

How GreenFlow handles *80CSU0802120B* requests

1

Identify the equipment

Confirm the model or series name, serial number if available, photos, and whether the unit is roof, exterior, basement, or mechanical-room equipment.

2

Describe the service issue

Share no heat, no cooling, weak airflow, error codes, alarms, leaks, noise, control problems, or comfort complaints.

3

Review access and history

Include access notes, tenant or business-hour constraints, filter status, recent repairs, and maintenance records when available.

4

Plan the next step

GreenFlow can route the request for diagnostics, repair planning, maintenance, replacement scope, or related system upgrades.

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Our Happy Customers

Anna G.

They quickly identified the issue with the heating system and fixed it efficiently. He explained everything clearly and made sure I understood what was going on. Very professional and reliable, extremely satisfied with the service.

Neal V.

In an industry that often fraught with contractors taking advantage of homeowners, Andrey was honest with his assessment and willing to install a product acquired elsewhere (most want that margin themselves), patiently answered my questions (I’m an engineer so like to understand what’s happening), and proactively offered practical...

Jenny W.

Great service! On time, knowledgeable & professional

Melissa S.

The repair person came quickly and was super efficient and polite, and showed me what to do next time. He gave my dog a quick pay and was off again.

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