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Day & Night Gas furnace *80CSU1002120B*

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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 *80CSU1002120B* product image

Technical Specifications

Product Specs

  • AHRI unit role: Furnace
  • AHRI model/pattern: *80CSU1002120B*
  • AHRI records represented: 126
  • AHRI equipment type: Central HP
  • AHRI tonnage: 2.9166666666666665
  • AHRI refrigerant: R-454B
  • Verified catalog model: *80CSU1002120B*
  • Verified product family: Ion 80 Ultra Low NOx Gas Furnace
  • Verified catalog brand: Day & Night
  • Verified model family: F80CSU
  • AHRI model/pattern: *80CSU1002120B*
  • Nominal input: 100,000 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 217909468

AHRI 217909468 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 217909475

AHRI 217909475 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 217915385

AHRI 217915385 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit N5H9V48*K*AAA* and indoor unit EVM5X49M21A*.
Eligible Central HP <5.4 tons

AHRI 217915390

AHRI 217915390 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit Q5H9V48*K*AAA* and indoor unit EVM5X49M21A*.
Eligible Central HP <5.4 tons

AHRI 217915815

AHRI 217915815 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit N5H9V48*K*AAA* and indoor unit EVM5X60M21A*.
Eligible Central HP <5.4 tons

AHRI 217915820

AHRI 217915820 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit Q5H9V48*K*AAA* and indoor unit EVM5X60M21A*.
Eligible Central HP <5.4 tons

AHRI 217916258

AHRI 217916258 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit N5H9V48*K*AAA* and indoor unit EVD5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217916263

AHRI 217916263 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit Q5H9V48*K*AAA* and indoor unit EVD5X48M21A*.
Eligible Central HP <5.4 tons

AHRI 217916636

AHRI 217916636 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit N5H9V48*K*AAA* and indoor unit EVD5X49M24A*.
Eligible Central HP <5.4 tons

AHRI 217916641

AHRI 217916641 identifies a Mass Save qualified Central HP <5.4 tons from DAY & NIGHT with outdoor unit Q5H9V48*K*AAA* and indoor unit EVD5X49M24A*.
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Service planning

How GreenFlow handles *80CSU1002120B* 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

Murali S.

HVAC technician was punctual, followed up well, completed quick repairs, ensured the issue was resolved, and provided helpful recommendations.

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.

Michael C.

always available, easy to get a hold of, as a property manager I get lots no heat emergency, usually get to it same day or next day

Sharad W.

Green Flow and the people who work there are terrific. Vlad and Andre are excellent. Andre was very helpful. He was punctual, respectful, efficient and knowledgeable. He did not try to sell me something I didn’t need ( as others have done before). I was charged $99 which...

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