Description
AOVH-40 Fan-Driven Air-Oil Cooler
The AOVH-40 is the largest and highest-capacity industrial air-oil cooler in the AOVH series, engineered for extreme-duty hydraulic systems, high-horsepower lubrication circuits, marine equipment, steel and aluminum processing lines, and other industrial environments where maximum heat rejection is required. With its extra-large core, high-volume airflow, and heavy-duty motor and fan assembly, the AOVH-40 delivers robust thermal performance even under continuous high-load operation.
AOVHR Two-Pass & Relief Bypass Option
For applications requiring superior thermal efficiency and enhanced system protection, the AOVH-40 can be configured in the AOVHR two-pass design. This version routes oil through the cooling core twice while incorporating an integral relief bypass valve to help prevent excessive backpressure during cold starts, high-viscosity operation, or sudden pressure spikes.
- Two-pass oil flow: Increases cooling efficiency by doubling oil exposure to the heat exchanger.
- Integral relief bypass: Commonly available with 30 psi or 60 psi relief settings.
- Typical flow range: For AOVHR-40-2, designed for approximately 8–80 GPM.
- Performance ratings: 300 psi maximum operating pressure; 400°F maximum operating temperature.
AOVH-40 Specifications
- Model: AOVH-40
- Series: AOVH industrial air-cooled oil cooler
- Cooling Type: Fan-driven, air-cooled oil cooler
- Maximum Operating Pressure: 300 psi
- Maximum Operating Temperature: 400°F
- Dimensions (in): A: 19.00, B: 45.25, C: 17.06, D: 34.00, E: 26.00, F: 30.50, G: 33.00, K: 14.30, L: 29.12, M: 22.00, N: 34.25, P: 46.25
- Connections: 2-1/2" NPT
- Approximate Net Weight: 350 lb
AOVH / AOVHR Series Overview
The Thermal Transfer AOVH and AOVHR series of industrial air-oil coolers provide efficient and compact thermal management for hydraulic and lubrication systems across a broad range of industrial applications. These coolers are widely used in injection molding, hydraulic power units, gear drives, machine tools, marine equipment, torque converters, and other systems requiring long-term, reliable cooling performance. AOVH models use a one-pass oil path suitable for standard applications, while AOVHR models add a two-pass flow route and integral relief bypass for enhanced cooling and system protection.
Key Features & Applications
- High-efficiency fin-and-tube heat exchanger engineered for heavy industrial cooling.
- Fan-driven airflow ensures predictable cooling regardless of ambient ventilation.
- Heavy-duty steel cabinet construction with a durable baked enamel finish.
- Available in one-pass (AOVH) or two-pass (AOVHR) configurations.
- Ideal for large hydraulic presses, marine systems, processing lines, industrial gearboxes, and high-duty-cycle HPUs.
- AOVHR relief bypass option protects against cold-start or high-viscosity overpressure.
Construction, Ratings & Materials
Pressure & Temperature Ratings
| Maximum Operating Pressure | 300 PSI |
|---|---|
| Maximum Operating Temperature | 400°F |
Standard Materials of Construction
| Tubes | Copper |
|---|---|
| Fins | Aluminum |
| Turbulators | Steel |
| Fan Blade | Aluminum with steel hub |
| Fan Guard | Zinc-plated steel |
| Cabinet | Steel with baked enamel finish |
| Manifolds | Steel |
| Connections | Steel |
Model Weights
| Model | Net Weight (lb) |
|---|---|
| AOVH / AOVHR-5 | 67 |
| AOVH / AOVHR-10 | 78 |
| AOVH / AOVHR-15 | 90 |
| AOVH / AOVHR-20 | 110 |
| AOVH / AOVHR-25 | 157 |
| AOVH / AOVHR-30 | 190 |
| AOVH / AOVHR-35 | 315 |
| AOVH / AOVHR-40 | 350 |
AOVHR Two-Pass Flow Ranges
| Two-Pass Model | Typical Flow Range (GPM) |
|---|---|
| AOVHR-5-2 | 4–50 |
| AOVHR-10-2 | 4–60 |
| AOVHR-15-2 | 4–60 |
| AOVHR-20-2 | 4–80 |
| AOVHR-25-2 | 4–80 |
| AOVHR-30-2 | 4–80 |
| AOVHR-35-2 | 6–80 |
| AOVHR-40-2 | 8–80 |
Installation & Piping Notes
Standard fan rotation is clockwise when viewing the motor shaft. AOVH/AOVHR coolers are typically mounted horizontally with airflow pulled through the finned core. Reference dimensional drawings for mounting hole patterns, bracket positions, and fan projection. Note that AOVH-5 and AOVH-10 use a rotated motor bracket orientation.
AOVH models use a one-pass oil flow path. AOVHR models route oil in and out on the same side, with an internal dividing plate providing the second-pass circulation. Confirm proper flow direction during installation.
Lubrication & Motor Bearing Maintenance
Standard motors include sealed, permanently lubricated ball bearings. Recommended regreasing intervals:
| Operating Condition | Grease Interval |
|---|---|
| Up to ~5,000 hrs/year | Every 5 years |
| Continuous operation | Every 2 years |
| Seasonal or intermittent duty | Every 1 year |
| High heat, dust, or vibration | Every 6 months |
Avoid over-greasing to prevent bearing damage.
Viscosity Correction Factors (Cv)
Use these multipliers when operating with oils of different viscosities or temperatures than standard sizing conditions (approximately 50 SSU leaving the cooler):
| Avg. Oil Temp (°F) | Mineral Oil (SAE) | 50/50 EG/Water | ||||
|---|---|---|---|---|---|---|
| SAE 5 | SAE 10 | SAE 20 | SAE 30 | SAE 40 | 50/50 Mix | |
| 100 | 1.14 | 1.22 | 1.35 | 1.58 | 1.77 | 1.11 |
| 150 | 1.01 | 1.05 | 1.11 | 1.21 | 1.31 | 1.02 |
| 200 | 0.99 | 1.00 | 1.01 | 1.08 | 1.10 | 0.96 |
| 250 | 0.95 | 0.98 | 0.99 | 1.00 | 1.00 | 0.95 |
Standard TEFC Motor & Fan Data
| Model | CFM | dB(A) | Motor HP | Volts | Phase | Full Load Amps | Hz | NEMA Frame | RPM | Type | Circuit | Thermal OL | Bearing |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AOVH-40 | 9609 | 91 | 3 | 208-230/460 | 3 | 9.0-8.6 / 4.3 | 60 | 182T | 1725 | TEFC | D | No | Ball |
Explosion-Proof Motor Options
Explosion-proof motors (Class I Group D; Class II Groups F & G) are available for hazardous locations. Always confirm final ratings on the motor nameplate.
Frequently Asked Questions
AOVH-40 Fan-Driven Air-Oil Cooler
▶️ Question: What types of applications require the high-capacity cooling of the AOVH-40?
Answer: The AOVH-40 is the largest cooler in the AOVH series and is designed for extreme-duty industrial systems that generate very high heat loads. This includes steel and aluminum processing lines, large industrial hydraulic presses, marine propulsion and auxiliary systems, high-horsepower gearboxes, large lubrication circuits, and continuous-duty manufacturing equipment. If your system routinely approaches thermal limits, the AOVH-40 provides the airflow and core surface area needed to maintain safe, reliable operating temperatures.
▶️ Question: When should I choose the AOVHR-40-2 two-pass version over the standard AOVH-40?
Answer: The AOVHR-40-2 should be selected when maximum cooling efficiency and system protection are priorities. The two-pass oil circuit significantly increases heat rejection efficiency, while the integrated relief bypass valve safeguards the hydraulic system from excessive pressure during cold starts or when oil viscosity spikes. With a functional range of approximately 8–80 GPM, the AOVHR-40-2 is ideal for large, high-energy systems with variable load conditions or harsh thermal demands.
▶️ Question: What should I consider when installing an AOVH-40 due to its size and airflow?
Answer: The AOVH-40 weighs approximately 350 lb and moves a very large volume of air, so it must be installed on a strong, stable horizontal platform capable of supporting both weight and operational vibration. Adequate airflow clearance is critical—allow ample space on both sides of the unit and ensure no obstructions prevent intake or exhaust flow. Oil should enter the lower port and exit the upper port, and flexible hoses are recommended to reduce stress on the cooler connections.
▶️ Question: What electrical requirements and noise levels should I expect from the AOVH-40?
Answer: The AOVH-40 uses a 3 HP TEFC fan motor, typically rated for 208–230/460 V, three-phase, 60 Hz operation. It runs at approximately 1725 RPM and produces about 91 dB(A) at full airflow. Because of its power draw, ensure your facility has appropriate three-phase electrical service and that wiring, overload protection, and breakers match the motor nameplate requirements.
▶️ Question: How do I ensure long-term performance from the AOVH-40 in demanding environments?
Answer: Maintain proper oil filtration to prevent debris from entering the cooling core, keep fins clean from dust and contamination, and ensure unrestricted airflow. Regularly inspect mounting hardware, check the fan guard and motor, and follow the lubrication schedule if the motor requires periodic greasing. Monitoring system oil temperatures over time helps identify performance changes or early signs of fouling.
