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NASV24B premium features and benefits
Field installed electric heat with breaker 5-20 kW
Control voltage terminal strip.
ECM, constant torque and constant CFM models available.
Copper sweat connections.
Shipped with a nitrogen holding charge.
Factory installed and calibrated TXV.
Factory installed A2L refrigerant sensor and mitigation control.
Model Number Guide
NASV24B QuickFacts
17.5" W x 43.0" H x 21.0" D (44.5cm W x 109.2cm H x 53.3cm D)
Product approvals
- AHRI Certified
- Yes
- cETLus
- Yes
| Item | NASV24B | |
|---|---|---|
| Dimensions | 17.5" W x 43.0" H x 21.0" D (44.5cm W x 109.2cm H x 53.3cm D) | |
| Nominal Capacity | 2 Tons | |
| Refrigerant | R-454B | |
| Tube Material | Aluminum | |
| Tube Type | Rifled | |
| Fin Material | Aluminum | |
| Fin Type | Lanced | |
| Certifications | AHRI, cETLus | |
Navien reserves the right to change specifications at any time without prior notice.
| NAS-Coverage Table for Labor and Parts Only | |||
| Residential2 | Commercial | ||
| Parts1 | Registered3 | 10 Years | 1 Year |
| Non-Registered4 | 5 Years | ||
| Labor | 90 Days | ||
Definitions:
Parts1 – refers to all internal functional components of the unit, except for the Combustion Heat Exchanger
Residential2 – Refers to a Single-Family, residential application.
Registered3 – Refers to coverages for units registered within 60 days of the Commencement date.
Non-Registered4 – Refers to coverages for units registered 61 days or more after the Commencement Date
| Equipment Specifications | |||||||
| Model | Volts/Hz/Phase | Maximum Electric Heat Available (kW) | Transformer Size & Type | Refrigerant Connection (IDS) | Weight (lbs) | ||
| Suction (in) | Liquid (in) | Unit | Shipping | ||||
| NASS24B2T2A1 | 208-230/60/1 | 10 | 40 Va, Class 2 | 3/4 | 3/8 | 105 | 115 |
| NASV24B2T2A1 | 208-230/60/1 | 10 | 40 Va, Class 2 | 3/4 | 3/8 | 106 | 116 |
| NASS36C2T2A1 | 208-230/60/1 | 15 | 40 Va, Class 2 | 3/4 | 3/8 | 120 | 131 |
| NASV36C2T2A1 | 208-230/60/1 | 15 | 40 Va, Class 2 | 3/4 | 3/8 | 121 | 132 |
| NASS48D2T2A1 | 208-230/60/1 | 20 | 40 Va, Class 2 | 7/8 | 3/8 | 167 | 179 |
| NASV48D2T2A1 | 208-230/60/1 | 20 | 40 Va, Class 2 | 7/8 | 3/8 | 168 | 180 |
| NASS59D2T2A1 | 208-230/60/1 | 20 | 40 Va, Class 2 | 7/8 | 3/8 | 169 | 181 |
| NASV59D2T2A1 | 208-230/60/1 | 20 | 40 Va, Class 2 | 7/8 | 3/8 | 170 | 182 |
Note: Weights listed are unit weights with packaging.
| Electric Heat Kit Compatibility | |||
| Size (kW) | Where Used | Maximum Overcurrent Protection (Amps)* | Model |
| kW | Application | Amps | Model |
| 0 | NASS24B/NASV24B | 15 | N/A |
| 5 | NASS24B/NASV24B | 35 | NEHV05B |
| 8 | NASS24B/NASV24B | 50 | NEHV08B |
| 10 | NASS24B/NASV24B | 60 | NEHV10B |
| 0 | NASS36C/NASV36C | 15 | N/A |
| 5 | NASS36C/NASV36C | 35 | NEHV05C |
| 8 | NASS36C/NASV36C | 50 | NEHV08C |
| 10 | NASS36C/NASV36C | 60 | NEHV10C |
| 15 | NASS36C/NASV36C | 90 | NEHV15C |
| 0 | NASS48&59D/NASV48&59D | 15 | N/A |
| 5 | NASS48&59D/NASV48&59D | 35 | NEHV05D |
| 8 | NASS48&59D/NASV48&59D | 50 | NEHV08D |
| 10 | NASS48&59D/NASV48&59D | 60 | NEHV10D |
| 15 | NASS48&59D/NASV48&59D | 90 | NEHV15D |
| 20 | NASS48&59D/NASV48&59D | 120 | NEHV20D |
*For single branch circuits. See full product specifications for dual branch circuit information.
Compare NAS models
NAS Videos
NASV24B FAQs
What is the difference between an SECM and a variable speed ECM motor?
SECM motors offer fixed multi-speed selection, while variable speed ECM motors provide true constant CFM operation for quieter performance, better efficiency, and enhanced humidity management.
Can I replace just the air handler?
The air handler is intended to last for the lifespan of your entire heat pump system, which typically ranges from 15 to 20 years. Other factors may lead to premature replacement, prompting homeowners to weigh the options between replacing only the air handler or investing in a new heat pump system. Factors such as corrosion, leaks, or damage to the coil can affect system efficiency and effectiveness. If your heat pump is still covered by a warranty, replacing just the air handler may be the right option. In such cases, the outdoor portion of your heat pump system may have more years of useful life, extending time until a complete unit replacement is needed. While replacing the air handler alone may seem like a cost-effective solution, it’s wise to consider replacing the air handler and the outdoor unit considering the following situations.
• System Age. If the indoor coil needs replacement and your heat pump is over 8 years old, it’s typically best to replace both components simultaneously, as the system is already halfway through its expected lifespan.
• Availability. It can be difficult to find a new air handler that’s compatible with an older Hp. Aligning these components ensures smooth operation and performance, reducing the chances of problems stemming from mismatched equipment.
• Warranty. If your Heat Pump is no longer under warranty, you’ll be responsible for any repair or replacement expenses, making it wise to consider replacing the entire Heat Pump system. New systems feature warranties that offer coverage against unforeseen repairs for a time period, usually 5-10 years.
• Efficiency. If your current Heat Pump is old and most likely inefficient, it will likely need to be replaced in the next couple of years. Opting for a new higher efficient Heat Pump system can decrease energy costs while improving the comfort level in your home
Do the air handler and condenser tonnage need to match?
Yes, they are required to be AHRI matched components. Matched systems and their performance can be found at www.ahridirectory.org
What is the life expectancy of an air handler?
With proper maintenance, air handlers typically last 10–15 years, though factors like usage and environmental conditions can affect service life.