ENGINEERING APPLICATION | RESIDENTIAL VENTILATION | DALLAS, TEXAS
Dallas Residential ERV Upgrade: Replacing Two 20-Year-Old 200 CFM Units
A homeowner in Dallas, Texas is evaluating more energy-efficient replacements for two Trane energy recovery ventilators (ERVs) installed approximately 20 years ago. Both units remain operational. The objective is not to correct a confirmed ventilation failure, but to retain dependable fresh-air delivery while improving fan efficiency and evaluating sensible and latent heat recovery performance.
Project scope: A 5,500 sq ft (approximately 511 m²) residence with one ERV serving the main level and another serving the upstairs area. The current equipment is rated at 200 CFM per unit, with 120V / 60Hz electrical supply at the installation locations.
1. Existing Equipment and the Homeowner's Objective
The homeowner provided the existing Trane ERV model and its performance information. These values are used as the preliminary replacement reference; final sizing requires confirmation of on-site duct resistance, dimensions, connections and actual airflow.
| Existing system | Owner-provided information |
|---|---|
| Location | Dallas, Texas, USA |
| Residence | 5,500 sq ft; main level and upstairs served separately |
| ERV model | Trane TERVR200A9P00AC |
| Quantity / age | 2 units / approximately 20 years in service |
| Nominal airflow | 200 CFM per ERV (approximately 340 m³/h) |
| Airflow at 0.2 in. w.g. | 192 CFM per unit |
| Airflow at 0.4 in. w.g. | 176 CFM per unit |
| Electrical supply | 120V / 60Hz |
| Recovery information | Approximately 78% sensible and 62% total recovery, as described in the owner's reference material; test conditions not independently verified |
| Current condition | Both ERVs operational; replacement motivated by energy efficiency |
Note: The airflow and recovery values above come from homeowner-supplied information. Recovery-efficiency percentages are not directly comparable without their respective test temperatures, airflow and rating methods.
Equipment concept for evaluation only; not a photograph of the final selected model.
2. Why Dallas Climate Matters for ERV Selection
Dallas experiences long, hot cooling seasons, periods of elevated outdoor humidity and cooler winter weather. A replacement ERV should therefore be evaluated for both sensible heat exchange and moisture transfer. In summer, the recovery core can reduce some of the temperature and humidity load associated with outdoor ventilation air, provided the unit is operated and balanced correctly.
An ERV is not a substitute for dedicated dehumidification. It can moderate part of the incoming moisture load but cannot independently guarantee an indoor relative-humidity setpoint. The home's existing HVAC equipment and air-purification system should be considered separately from the ERV replacement.
Conceptual distribution diagram: one ERV serves the main level and a separate ERV serves upstairs; duct routes not field-verified.
3. Replacement Selection: Match the Airflow Curve, Not Just the Label
A new product advertised as “200 CFM” may deliver significantly less airflow once connected to existing ducts, filters and fittings. The key comparison is net supply and exhaust airflow at the same external static pressure.
| Selection criterion | Required evaluation |
|---|---|
| Airflow and static pressure | Target performance near 192 CFM at 0.2 in. w.g. and 176 CFM at 0.4 in. w.g.; verify both supply and exhaust sides |
| Fan technology | Variable-speed EC/ECM fans with documented wattage at the selected duty point |
| Recovery core | Sensible and total energy recovery; request comparable rated data at specified conditions |
| Power supply | 120V / 60Hz preferred to avoid unnecessary electrical modifications |
| Filtration | Serviceable filters; check filter pressure drop at the selected airflow |
| Mechanical compatibility | Cabinet dimensions, access clearance, duct connection positions, drainage and controls |
| Performance verification | Manufacturer fan curves, power data and applicable third-party certification for the exact model |
At present, the equipment capacity appears reasonable for a replacement of the same general duty. This does not establish that the installed ventilation rate meets every room's needs; actual duct losses, run time, occupant count and room-level distribution would have to be measured or checked.
4. Energy Efficiency: How to Compare Old and New ERVs
Selecting an EC fan is a useful starting point, but it is not sufficient evidence of energy savings. Two units should be compared at an equivalent delivered airflow, static pressure, supply/exhaust balance and operating schedule.
Recommended comparison:
1. Measured or rated fan input power (W) at the selected airflow and external static pressure.
2. Net supply and exhaust airflows, not just the maximum nominal capacity.
3. Sensible recovery efficiency and summer total recovery efficiency under comparable test conditions.
4. Installed cost, filter maintenance, electrical modifications and expected operating hours.
For independent product screening, the Home Ventilating Institute (HVI) HRV/ERV directory provides published airflow, power and energy-recovery rating information for listed products. Energy savings and payback should not be claimed until comparable data for the existing and proposed units are available.
Existing performance is owner-provided; replacement performance, energy savings and power consumption remain to be verified.
5. Optional Outdoor-Air Filtration
The existing central HVAC systems already include air purification. Additional filtration at the ERV outdoor-air inlet is an optional enhancement, rather than a confirmed requirement. If specified, it should be selected for the intended particles and compatible with the ERV's available fan pressure.
A higher-efficiency filter can increase pressure drop as it loads with dust. Designers should verify the airflow curve, filter access, weather protection and maintenance requirements before adding a separate filtration housing. Filtration alone does not remove indoor carbon dioxide or provide active humidity control.
6. Electrical Compatibility and Installation
Both existing ERV locations have 120V power. A native 120V / 60Hz replacement is the preferred route for a straightforward installation. Some preliminary candidate equipment is available around 350 m³/h (approximately 206 CFM) with EC fans and total heat recovery, but its published supply voltage is 208–230V. Such equipment is not a direct electrical replacement.
A step-up transformer may be technically possible in some installations, but selection would require review of the exact unit nameplate, starting/current characteristics, branch circuit capacity, grounding, protective devices, available installation space, local electrical rules and equipment listing conditions. Any transformer losses must also be included in the overall energy evaluation. The 208–230V candidate has not been approved as the final project selection.
7. YUJU's Engineering and OEM Supply Approach
YUJU EnvironTech is evaluating residential ERV equipment that can meet the Dallas homeowner's practical replacement requirements: comparable duty-point airflow, high-efficiency EC fans, sensible and latent energy recovery, suitable filtration and installation compatibility.
Our supply process begins with application and market requirements, proceeds through verified product performance and installation constraints, and then considers OEM sourcing, documentation, spare parts and technical support when an appropriate manufacturing option is available.
The next technical step is to obtain manufacturer airflow curves, rated power and recovery data, cabinet drawings, filter specifications and applicable product listings for shortlisted 120V models. Only then can the replacement choices and commercial quotation be compared on a consistent basis.
Project status: Preliminary engineering assessment and replacement-product evaluation. No final model approval, energy-saving measurement, installation or commissioning is claimed.
For residential ERV replacement, fresh-air ventilation equipment and OEM supply discussions, contact YUJU EnvironTech at www.yujuenv.com.
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