Custom Indoor ERU for a Renovated Downtown High Rise

XeteX designed and manufactured a custom indoor energy recovery unit (ERU) specifically for a 26-story renovated downtown high-rise that accommodates both condominiums and office spaces.

To address the building’s modernization needs, XeteX replaced the 1980s HVAC infrastructure with a packaged DX water source heat pump (WSHP) system, an enthalpy energy wheel, and high-efficiency filters, and more.

Given the constraints of limited renovation and mechanical space, the solution required a split-section unit design, allowing the ERU to be transported in sections and fully reassembled within the building.

The result is an indoor custom ERU that delivers energy-efficient, year-round climate control and enhanced indoor air quality for both residents and office occupants.

Performance

Model: AHR-2500-DX-HG-HP-FF
Dimensions: 126”H x 262”L x 104”W
Weight: 15,000 lbs
Supply CFM: 15,678 CFM
Energy Recovery: Enthalpy Energy Wheel
Energy Effectiveness: Winter: 70% / Summer: 68%
Heating Types / Heating Capacities: DX Heating: 472 MBH
Hot Gas Reheat: 259 MBH
Cooling Type / Cooling Capacity: DX Cooling: 44 Tons

Construction

• Indoor five-section split unit
• 2” double wall thermal break construction with injected foam (R-value 14) insulation
  • 18ga galvanneal outer casing with acrylic paint
  • 20ga galvanized interior casing
• Welded 8” C-channel structural steel base frame with lifting lugs & acrylic paint
• 16ga galvanized floor with 2” injected foam (R-value 14) insulation
• 304 SS drain pan 

Features

• An integral water source heat pump with multiple staged compressors and VFD lead
• Factory mounted controls
• Enthalpy energy wheel with low cross contaminating seal system, purge section and full season controls
• IP 65 rated unit LED lights and GFI
• Bipolar ionization
• OA Ebtron
• SA/EA ECM driven fans with PIEZO flow rings

Components

A. OA airflow station
B. OA 2” MERV 8 filters
C. SA 4” MERV 13 filters
D. Enthalpy energy wheel 
E. DX cooling coil with SS casing
F. Hot gas reheat coil with SS casing
G. Water source heat pump section
H. SA premium three plenum fan array
I. RA 2” MERV 8 filters
J. EA premium two plenum fan array
K. Split sections

Learn more about XeteX custom energy recovery solutions!