What's in the box
- 1 × MRCOOL® 15 ft R-454B No-Vac Quick Connect Line Set
Professional installation is recommended.
This No-Vac Quick Connect line set is designed for compatible MRCOOL® R-454B systems and should be installed according to the product installation documentation.
Always confirm compatibility with your specific system model before installation.
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Free shipping available.
Orders ship from U.S. warehouse locations. Delivery times may vary by product availability, destination, and freight carrier scheduling.Returns must follow Cool Heat Direct’s return policy and the product must meet return eligibility requirements.
Manuals & documents
MODEL: NV15-3834-O
SERIES: No-Vac Line Set R-454B
Quick Connect Line Set for Compatible MRCOOL® Systems.
Need the correct line set connection for your compatible MRCOOL® VersaPro or Central Ducted Hyper Heat system?
The MRCOOL® 15 ft R-454B No-Vac Quick Connect Line Set is designed to help simplify installation by providing a precharged, kink-resistant line set with secure Quick Connect fittings.
Built for compatible R-454B systems, this 15 ft line set includes UV-protected insulation to help protect performance and durability during installation.
The No-Vac design helps reduce installation complexity by eliminating the need for traditional vacuuming when used with compatible MRCOOL® equipment.
With 3/8" liquid and 3/4" suction line sizing, this accessory is made for specific MRCOOL® central ducted applications and should be matched carefully before purchase.
Simple connection. Protected insulation. Built for compatible MRCOOL® systems.
Why You’ll Love It
✅ 15 ft No-Vac line set
✅ Designed for compatible R-454B systems
✅ Precharged for simplified installation
✅ Simple secure Quick Connect fittings
✅ Kink-resistant design
✅ UV-protected insulation
✅ Helps reduce installation complexity
✅ Designed for compatible MRCOOL® VersaPro and Central Ducted Hyper Heat systems
Best For
MRCOOL® VersaPro Systems • Central Ducted Hyper Heat Systems • Compatible R-454B Installations • Replacement Line Sets • Professional HVAC Installations
Compatibility
Works with compatible MRCOOL® VersaPro 2nd Gen and Central Ducted Hyper Heat 2nd Gen systems.
Always confirm system compatibility, refrigerant type, line size, and required line set length before purchase.
| Specification | Details |
|---|---|
| Product Type | Line Set |
| Model | NV15-3834-O |
| Series | No-Vac Line Set R-454B |
| Line Set Length | 15 ft |
| Refrigerant Type | R-454B |
| Refrigerant Volume | 2.11 oz |
| Fitting Type | Quick Connect |
| Liquid Line Size | 3/8" |
| Suction Line Size | 3/4" |
| Insulation | UV Protected |
| Kink Resistant | Yes |
| Precharged | Yes |
| Contains Chemicals | Yes |
| Net Weight | 14 lb |
| Gross Dimensions | 30" W × 30" H × 5" D |
| Gross Weight | 17 lb |
Questions, answered
Everything homeowners ask before buying a MRCOOL® system.
Installation
Do I need an HVAC technician to install this?
No. MRCOOL® DIY systems are designed for homeowner installation. The pre-charged Quick Connect® line set means there's no refrigerant handling, no vacuum pump, and no special tools or license required.
How long does installation take?
Most single-zone systems go in within a few hours: mount the indoor air handler, set the outdoor condenser, connect the pre-charged line set, and power it on.
Do I need an electrician?
The system needs a dedicated circuit. Most homeowners have a licensed electrician add the breaker and disconnect — everything else you can do yourself.
Sizing & compatibility
What BTU size do I need?
As a rule of thumb: up to 400 sq ft → 9–12K BTU, 400–600 sq ft → 12–18K, 600–1,000 sq ft → 18–24K. Use the room-size guide above and factor in insulation, ceiling height and sun exposure.
Will it heat in winter?
Yes — these are heat pumps, so they heat and cool. Many MRCOOL® systems keep heating in sub-freezing temperatures; check each model's spec sheet for its low-temperature heating range.
115V or 230V — which do I need?
9K–12K units are usually 115V (standard outlet circuit); 18K and larger are typically 230V. The voltage is shown in the product options and specifications.
Warranty & support
What warranty is included?
MRCOOL® systems carry manufacturer warranty coverage — typically 5–10 years on major components when you register your system after installation.
How do I get help choosing or installing?
Email support@coolheatdirect.com — our U.S. team replies within one business day with sizing, voltage and compatibility help.
Shipping & returns
How fast does it ship?
Most products ship in 3–5 business days with free curbside delivery in the continental U.S. The freight carrier calls to schedule your delivery.
Can I return it?
Returns are accepted within 30 days on new, unopened items in original packaging. A restocking fee may apply to HVAC equipment — we always confirm before issuing a return authorization.
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