Description
AOVH-30 Fan-Driven Air-Oil Cooler
The AOVH-30 is a heavy-duty industrial air-oil cooler engineered for larger hydraulic systems, industrial gearboxes, and continuous-duty machinery requiring substantial cooling capacity. With its larger core and increased airflow, the AOVH-30 handles higher heat loads efficiently, making it suitable for demanding applications such as hydraulic power units, processing equipment, and high-duty-cycle industrial automation.
AOVHR Two-Pass & Relief Bypass Option
For applications requiring even greater cooling efficiency and added system protection, the AOVH-30 can be configured as an AOVHR model. The AOVHR configuration uses a two-pass oil circuit—routing oil through the core twice—and includes an integral relief bypass valve that safeguards the system from excessive backpressure during cold starts or high-viscosity conditions.
- Two-pass oil flow: Doubles the cooling exposure for enhanced heat rejection.
- Integral relief bypass: Available in common 30 psi or 60 psi relief settings (model dependent).
- Typical flow range: For AOVHR-30-2, designed for approximately 4–80 GPM.
- Performance ratings: 300 psi maximum operating pressure; 400°F maximum operating temperature.
AOVH-30 Specifications
- Model: AOVH-30
- 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: 15.81, B: 31.62, C: 13.78, D: 27.56, E: 23.33, F: 24.94, G: 25.12, K: 11.59, L: 23.19, M: 14.25, N: 28.50, P: 33.62
- Connections: 2" NPT, 2-1/2-12UN SAE
- Approximate Net Weight: 190 lb
AOVH / AOVHR Series Overview
The Thermal Transfer AOVH and AOVHR series of industrial air-oil coolers offer efficient, compact, and reliable cooling solutions for hydraulic and lubrication systems. These coolers are widely used in injection molding equipment, hydraulic power units, gearboxes, machine tools, torque converters, and general industrial systems that require dependable heat rejection. AOVH models use a one-pass configuration for standard duty, while AOVHR models add a two-pass oil circuit and integral relief bypass for enhanced cooling performance and system protection.
Key Features & Applications
- High-efficiency fin-and-tube core engineered for industrial-duty cooling.
- Fan-driven airflow ensures predictable heat rejection regardless of ambient airflow.
- Compact, heavy-duty steel cabinet for simplified installation.
- Available with one-pass (AOVH) or two-pass (AOVHR) circuits to suit system flow requirements.
- Ideal for hydraulic presses, gear drives, power units, lubrication systems, and industrial machinery.
- AOVHR relief bypass reduces risk of overpressure during cold starts or high-viscosity operation.
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 orientation (AOVH-5 and AOVH-10 brackets are rotated 90°), and fan projection.
AOVH models use a one-pass flow path (lower inlet → upper outlet). AOVHR models route oil in and out on the same side, using an internal cap to create the two-pass circuit. Always verify flow direction before installation.
Lubrication & Motor Bearing Maintenance
Standard motors include sealed, factory-lubricated ball bearings. Typical regreasing intervals include:
| Operating Condition | Grease Interval |
|---|---|
| Up to ~5,000 hours/year | Every 5 years |
| Continuous duty | Every 2 years |
| Seasonal or intermittent duty | Every 1 year |
| High heat, dust, or vibration | Every 6 months |
Over-greasing may cause bearing damage—follow manufacturer recommendations.
Viscosity Correction Factors (Cv)
Use these multipliers to adjust performance when oil viscosity or temperature differs from standard sizing conditions (approximately 50 SSU oil 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-5 | 780 | 85 | 1/2 | 115/208-230 | 1 | 7.4 / 3.9-3.7 | 60 | 48 | 3450 | TEFC | C | No | Ball |
| AOVH-10 | 1110 | 85 | 1/2 | 115/208-230 | 1 | 7.4 / 3.9-3.7 | 60 | 48 | 3450 | TEFC | A | No | Ball |
| AOVH-15 | 1590 | 91 | 1/2 | 115/208-230 | 1 | 7.4 / 3.9-3.7 | 60 | 48 | 3450 | TEFC | A | No | Ball |
| AOVH-20 | 2168 | 91 | 1/2 | 115/208-230 | 1 | 7.4 / 3.9-3.7 | 60 | 48 | 3450 | TEFC | C | No | Ball |
| AOVH-25 | 3000 | 81 | 1 | 115/208-230 | 1 | 12.4 / 6.5-6.2 | 60 | 56 | 1725 | TEFC | C | No | Ball |
| AOVH-30 | 4095 | 84 | 1 | 115/208-230 | 1 | 12.4 / 6.5-6.2 | 60 | 56 | 1725 | TEFC | C | No | Ball |
| AOVH-35 | 5921 | 89 | 3 | 208-230/460 | 3 | 9.0-8.6 / 4.3 | 60 | 182T | 1725 | TEFC | D | No | Ball |
| 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. Verify electrical ratings directly from the motor nameplate.
Frequently Asked Questions
AOVH-30 Fan-Driven Air-Oil Cooler
▶️ Question: What types of hydraulic or lubrication systems typically require an AOVH-30?
Answer: The AOVH-30 is designed for large hydraulic power units, continuous-duty industrial machinery, marine systems, process equipment, and high-horsepower gearboxes that generate substantial heat. If your system operates for long periods, has elevated working pressures, or experiences significant thermal load, the AOVH-30 provides the cooling surface area and airflow needed to maintain stable oil temperatures.
▶️ Question: How does the AOVHR-30-2 two-pass version improve cooling, and when should I choose it?
Answer: The AOVHR-30-2 increases heat rejection by routing the oil through the core twice, giving it more dwell time for temperature reduction. It also includes an integral relief bypass valve to protect the system during cold starts or viscosity spikes. With a typical flow range of around 4–80 GPM, the AOVHR-30-2 is ideal for demanding applications where higher thermal loads or variable flow conditions are present.
▶️ Question: What are the physical installation requirements for the AOVH-30?
Answer: The AOVH-30 must be mounted horizontally with clear airflow to and from the finned core. Its larger size and weight (approx. 190 lb) require a sturdy mounting surface or frame. Oil should enter the lower port and exit the upper port. Always allow adequate clearance for motor cooling, access to electrical wiring, and routine maintenance. Using flexible hose connections helps reduce vibration and mechanical stress on the cooler.
▶️ Question: What electrical data and noise levels should I plan for?
Answer: The AOVH-30 typically uses a 1 HP TEFC fan motor rated for 115/208–230 V, single-phase, 60 Hz. It operates at approximately 1725 RPM and produces around 84 dB(A). Ensure wiring, circuit protection, and ventilation comply with the motor nameplate. If your installation is in a noise-sensitive area, consider acoustic shielding or placement further from personnel.
▶️ Question: How can I maximize cooler performance and lifespan in demanding applications?
Answer: Keep airflow unobstructed, clean the finned core regularly, and maintain proper oil filtration to prevent fouling. Monitor system pressure and temperature to ensure the cooler is sized correctly—especially at higher viscosities. Check the fan motor, guard, and mounting hardware periodically, and follow lubrication schedules for motors that require greasing. Installing the cooler in a return line or dedicated cooling loop typically offers the most consistent performance.
