Nexus
Ultra-High Efficiency Unit Heaters
Sterling’s Nexus brings gas-fired unit heaters to unprecedented levels of efficiency. Its industry leading 99%* thermal efficiency combines the latest innovations, including a tri-metal stainless steel heat exchanger and a state-of-the-art proprietary combustion control system.
Efficiency matters...not only is the Nexus the most energy efficient unit heater available, but it is also the most environmentally friendly too. Reduced emissions, low fuel utilization and a reduced carbon footprint give Nexus our green stamp of approval!
*Up to 99% maximum efficiency at full turndown, 95+% certified efficiency at high fire.
Standard Features
Outdoor Air Reset Modulation
Units automatically vary discharge temperatures based on the outside air temperature providing seamless modulation for optimum efficiencies. By running at lower discharge temperatures subject to the outdoor temperatures, units run longer at higher efficiency resulting in less cycling, lower fuel costs, and increased occupancy comfort. As the outdoor temperature drops, discharge temperatures increase and vice versa. Outdoor Air Reset is optimal in regions with substantial daily temperature swings.
Indoor Air Reset
Nexus’ indoor air reset technology essentially learns the heating needs of the building by constantly monitoring run-time percentages and modulates accordingly. Indoor Air Reset allows Nexus to operate at full modulation (low fire) for as long as reasonable to maintain the heating load. By running at low fire units run longer at higher efficiency resulting in less cycling, lower fuel costs and increased occupancy comfort.
MODBUS COMMUNICATION TO BUILDING AUTOMATION SYSTEM
The Nexus Control Board includes Modbus communication as a standard feature without requiring additional control modules. The control board provides feedback to the building automation system allowing for the remote monitoring of over 30 data points including unit fault codes. This allows user to know what is wrong with the unit without even entering the building
Gas Controls
The only fully modulating, high efficiency unit heater produced, Nexus utilizes a burner control and configuration that allows a 3:1 turndown for precision discharge temperature control, with this technology units run more efficiently for a longer period of time with reduced cycling. Competitors use in-shot burners and only offer 1:1 on/off configuration that often times result in over/under heating the occupied space and increased wear and tear on the equipment with constant cycling.
SAFETY & PERFORMANCE
Premium performance in the safest possible way… All units use Sterling’s proprietary combustion control platform which guarantees clean combustion regardless of the operating conditions. Combustion is constantly monitored through Nexus’ electronic air/fuel coupling control platform, consistently maintaining safe levels of emissions.
ALTITUDE AUTO-ADJUST
Units auto-adjust the air/fuel mixture for altitude adjustments so there are no field adjustments required. Nexus also has SafeSense technology for blocked inlet/flue conditions. Units will maintain clean combustion in a partial blockage situation without decreasing performance insuring safe combustion at all times. In a situation of unsafe combustion, units will shut themselves down until the necessary corrective actions are completed.
Heat Exchanger
Nexus’ tri-metal heat exchanger is the most advanced on the market today. Engineered for maximum efficiency; our tri-metal hybrid design utilizes all of today’s technologies for optimum heat transfer. A unique combination of metals and tube configurations scrub every last bit of heat energy from the combustion process. The use of stainless steel with high conductivity brass and even higher conductivity aluminum all working in conjunction with turbulators to improve the heat transfer from the hot flue gases to the bi-metal fins produces up to 95+% operating efficiency at full fire
Sophisticated Styling
Nexus brings a whole new look to the unit heater arena with a beautiful commercial-grade brushed stainless steel jacket with contrasting black trim. Its corrosion resistant exterior and double-wall construction provide both durability and increased efficiency through reduced heat loss…appealing and functional.
APPLICATION FLEXIBILITY
In today’s marketplace where time is money, Nexus is designed to be user and service friendly. Whether natural or LP gas, conversions are simple and quick through a single orifice conversion with kits included as a standard feature. Multiple operating voltages, flexible venting options and some of the longest throws in the segment make Nexus the only choice for any application. Units can operate in a single unit mode, multi-unit networks or linked to a building management system with seamless control communication.
Name | HU050 | HU100 | HU150 | HU200 | HU300 | HU400 |
|---|---|---|---|---|---|---|
| MBH Input | 50 MBH | 100 MBH | 150 MBH | 200 MBH | 300 MBH | 400 MBH |
| MBH Output | 48,600 MBH | 96,000 MBH | 143,000 MBH | 192,000 MBH | 285,000 MBH | 384,000 MBH |
| Thermal Efficiency | 97% | 96% | 95% | 96% | 95% | 96% |
| Air Temp Rise | 57°F | 55°F | 50°F | 55°F | 55°F | 55°F |
| Turn Down Ratio | 3:1 | 3:1 | 3:1 | 3:1 | 3:1 | 3:1 |
| Modulating Control | Yes | Yes | Yes | Yes | Yes | Yes |
| Entering Airflow (CFM @ 70°F) | 790 CFM | 1616 CFM | 2661 CFM | 3232 CFM | 4848 CFM | 6464 CFM |
| Outlet Velocity (FPM) | 697 FPM | 977 FPM | 928 FPM | 1127 FPM | 1101 FPM | 1114 FPM |
| Heat Throw @ 20' Mounting Height | N/A | 150' | N/A | 150' | 150' | 150' |
| Combustion Air Intake Size | 2" | 2" | 2" | 3" | 4" | 4" |
| Combustion Air Intake Material | PVC/CPVC | PVC/CPVC | PVC/CPVC | PVC/CPVC | PVC/CPVC | PVC/CPVC |
Motors | ||||||
| Motor HP | 1/14 | 1/2 | 1/12 | 1/2 | 1 | 1 |
| Motor Count | 2 Motor(s) | 1 Motor(s) | 2 Motor(s) | 2 Motor(s) | 2 Motor(s) | 2 Motor(s) |
| Motor RPM | 1,500 RPM | 1,500 RPM | 1,500 RPM | 1,500 RPM | 1,625 RPM | 1,625 RPM |
Venting | ||||||
| Flue Size | 2" | 2" | 2" | 3" | 4" | 4" |
| Flue Material | PVC/CPVC | PVC/CPVC | PVC/CPVC | PVC/CPVC | PVC/CPVC | PVC/CPVC |
| Venting Category | IV | IV | IV | IV | IV | IV |
Fuel | ||||||
| Fuel Type | NG/LP | NG/LP | NG/LP | NG/LP | NG/LP | NG/LP |
| Min Gas Pressure Natural | 5 in wc | 5 in wc | 5 in wc | 5 in wc | 5 in wc | 5 in wc |
| Min Gas Pressure LP | 8 in wc | 8 in wc | 8 in wc | 8 in wc | 8 in wc | 8 in wc |
| Max Gas Pressure Natural | 14 in wc | 14 in wc | 14 in wc | 14 in wc | 14 in wc | 14 in wc |
| Max Gas Pressure LP | 14 in wc | 14 in wc | 14 in wc | 14 in wc | 14 in wc | 14 in wc |
| Gas Connection Size | .5" | .5" | .5" | .5" | .75" | .75" |
Condensate | ||||||
| Condensate Trap | Yes | Yes | Yes | Yes | Yes | Yes |
| Condensate Discharge Size | .75" | .75" | .75" | .75" | .75" | .75" |
| Condensate Production (gal/hr) | .41 gal/hr | .73 gal/hr | 1.06 gal/hr | 1.38 gal/hr | 1.71 gal/hr | 3 gal/hr |
Electrical | ||||||
| Supply Voltage Phase | 115V - 1PH | 115V - 1PH | 115V - 1PH | 115V - 1PH | 115V - 1PH | 115V - 1PH |
| Full Load Amps | 10.80 | 10.30 | 17.60 | 17.60 | 31.20 | 31.20 |
| Motor Amps (total fan motor amps) | 5.20 | 6.00 | 12.00 | 12.00 | 22.00 | 22.00 |
Dimensions | ||||||
| Height | 12.25" | 17.25" | 17.25" | 17.25" | 25.69" | 33.44" |
| Width | 42.19" | 42.19" | 54.19" | 54.19" | 54.19" | 54.19" |
| Depth | 32.63" | 38" | 41" | 42" | 42" | 42" |
| Weight | 120 lbs | 180 lbs | 209 lbs | 260 lbs | 323 lbs | 385 lbs |
Clearance Service/Combustible | ||||||
| Air Intake Side | 18" | 18" | 18" | 18" | 36" | 36" |
| Access Side | 18" | 18" | 18" | 18" | 18" | 18" |
| Non Access Side | 2" | 6" | 6" | 6" | 6" | 6" |
| Top | 2" | 6" | 6" | 6" | 6" | 6" |
| Bottom | 2" | 6" | 6" | 6" | 6" | 6" |
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