Installation Guide
Tools Needed:
- Adjustable wrench set
- Level
- Screwdrivers (flat and Phillips)
- Pipe wrench
- Tape measure
- Air pressure gauge
Step-by-Step Installation
- Choose Installation Location: Select a clean, dry, well-ventilated location with sufficient clearance for maintenance and operation.
- Foundation Preparation: Ensure a solid, level concrete foundation capable of supporting the compressor's weight and vibration.
- Electrical Connection: Connect to appropriate power supply (see specifications). All electrical work must comply with local codes.
- Air System Connection: Install proper air piping with drip legs and shutoff valves. Ensure piping is sized correctly for airflow.
- Oil Level Check: Verify proper oil level in the crankcase before initial startup.
- Pressure Settings: Set cut-in and cut-out pressures according to application requirements.
- Initial Startup: Perform initial startup following the break-in procedure outlined in the manual.
Specifications
| Model Number | IR 750 |
| Type | Two-Stage Reciprocating Air Compressor |
| Compressor Pump | Cast Iron Construction |
| Air Delivery (CFM) | 24.5 CFM at 175 PSI |
| Maximum Pressure | 175 PSI |
| Motor Power | 7.5 HP |
| Tank Capacity | 80 Gallons |
| Noise Level | 78 dB(A) |
| Power Requirements | 230V/460V, 3 Phase, 60Hz |
| Dimensions (LxWxH) | 72 x 36 x 68 inches |
| Weight | 850 lbs |
| Oil Capacity | 2.5 Quarts |
Warranty Information
- Compressor Pump: 2 years limited warranty
- Motor: 1 year limited warranty
- Tank: 5 years limited warranty
- Additional Coverage: Extended warranty options available
For warranty service, contact Ingersoll Rand Customer Service at 1-800-247-3865 or visit IngersollRand.com
Key Features
Two-Stage Compression
Delivers higher efficiency and cooler operation by compressing air in two stages, reducing moisture and increasing compressor life.
Cast Iron Construction
Heavy-duty cast iron cylinders and crankcase provide superior durability, heat dissipation, and long service life.
Pressure Lubrication System
Full pressure lubrication ensures all moving parts receive proper oiling, reducing wear and extending component life.
Thermal Valve Protection
Automatic thermal protection valve prevents overheating by regulating discharge temperature.
Low RPM Operation
Operates at lower RPMs than single-stage compressors, reducing wear, noise, and maintenance requirements.
ASME Certified Tank
80-gallon ASME certified air tank with safety valve and drain cock for reliable, safe operation.
Operating Components
Pressure Switch
Automatically controls compressor operation between preset pressure limits
Check Valve
Prevents backflow of air from tank to pump when compressor is off
Safety Valve
Releases excess pressure if controls fail, ensuring tank safety
Intercooler
Cools air between compression stages, improving efficiency
Aftercooler
Reduces air temperature before storage, removing moisture
Oil Sight Glass
Allows visual inspection of oil level without opening system
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Compressor won't start | Power issue, pressure switch failure, thermal overload | Check power supply, test pressure switch, reset overload |
| Low pressure output | Worn valves, intake filter clogged, belt slippage | Inspect valves, clean/replace filter, check belt tension |
| Excessive noise/vibration | Loose components, worn bearings, improper mounting | Tighten all fasteners, check bearings, verify foundation |
| Overheating | Dirty cooling fins, low oil, restricted airflow | Clean cooling surfaces, check oil level, ensure ventilation |
| Oil in discharge air | Worn piston rings, overfilled oil, wrong oil type | Check rings, adjust oil level, use recommended oil |
| Excessive cycling | Air leaks, faulty check valve, undersized system | Check for leaks, test check valve, verify system sizing |
Maintenance Codes & Indicators
- Red Oil Light: Low oil pressure - Check oil level and pump
- High Temp Light: Overheating - Check cooling system and ventilation
- Motor Overload: Electrical issue - Check amp draw and reset overload
- Pressure Fluctuation: Valve issue - Inspect compressor valves
- Moisture in Air: Drain issue - Check aftercooler and tank drain
- Belt Squeal: Drive issue - Check belt tension and alignment
Manual Downloads
IR 750 Series Manuals
IR 750-80
7.5HP 80 Gallon Two-Stage
IR 750-60
7.5HP 60 Gallon Two-Stage
IR 750V
7.5HP Vertical Tank Model
IR 750Q
Quiet Series Sound Enclosure
Related Models & Accessories
IR 5HP Series
5HP Two-Stage Compressors
IR 10HP Series
10HP Industrial Compressors
Air System Guide
Piping & Accessory Installation
Maintenance Kit
Service Parts & Filter Guide