Lennox Rooftop Units
Lennox commercial rooftop units combine innovative technology with high efficiency ratings and reliable performance for a wide range of commercial applications.
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Popular Models
Technical Specifications
Capacity & Efficiency
Airflow & Pressure
Dimensions
Power Requirements
Common Issues & Solutions
Blower motor failure
Symptoms:
Reduced or no airflow, unusual noises, motor overheating, tripped breaker
Solution:
Inspect motor bearings, check voltage, verify proper amperage draw. Replace motor and capacitor if failed, ensure proper belt tension after replacement.
Ignition failure
Symptoms:
No heat, cold air from vents, furnace lockout code
Solution:
Check ignitor for cracks, inspect flame sensor for corrosion, verify gas pressure and valve operation. Clean or replace components as needed, check safety circuits.
Refrigerant leaks
Symptoms:
Reduced cooling performance, ice formation on evaporator coil, compressor short cycling
Solution:
Locate leak using electronic detector or UV dye, repair damaged components, evacuate system, and recharge to manufacturer specifications with proper refrigerant.
Cost Information
| Service | Average Cost | Cost Factors |
|---|---|---|
| Belt replacement | $150-$300 | Labor rates, accessibility, belt type, additional adjustments required |
| Blower motor repair/replacement | $500-$1,200 | Motor size, type (ECM vs PSC), labor rates, accessibility |
| New unit installation | $7,000-$25,000 | Unit size/capacity, efficiency rating, building modifications, crane requirements, removal of old equipment |
| Preventive maintenance contract | $800-$2,000 annually | Unit size, number of units, service frequency, included repairs |
Frequently Asked Questions
What efficiency ratings are available for Lennox commercial rooftop units?
Lennox offers a range of efficiency options, from standard efficiency models (up to 14 SEER) to ultra-high efficiency units (up to 23 SEER) in their Energence line. Higher efficiency models typically feature multi-stage compression and variable-speed fans.
How does the Lennox Prodigy control system work?
The Lennox Prodigy control system is an integrated control platform that provides real-time monitoring, diagnostics, and precise performance management. It features an intuitive interface, remote access capabilities, and can integrate with various building automation systems through BACnet, LonTalk, or Modbus protocols.
What maintenance is required for Lennox rooftop units?
Regular maintenance includes quarterly filter changes, coil cleaning (annually), belt inspection and adjustment, electrical connection tightening, refrigerant level checks, control system verification, and condensate drain cleaning. Lennox recommends bi-annual professional maintenance at minimum.
How long do Lennox commercial RTUs typically last?
With proper maintenance, Lennox commercial rooftop units typically last 15-20 years. Higher-end models with better components and regular service may last longer, while units in harsh environments or with irregular maintenance may have shorter lifespans.
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