Installation: Powerex Vertical Scroll Tankmount Compressors Instruction Manual

Overview

Vertical Scroll Tankmount Compressors are oil-less compressed-air systems designed for applications that require clean air, continuous operation, and a compact vertical layout. The Powerex tankmount models covered by this guide are complete systems with the scroll pumps, receiver tank, controls, pressure components, and associated air connections assembled as a functional package.

These compressors are suitable for users who need dependable compressed air for equipment, production processes, workshops, and other applications that do not require breathing-quality air. The oil-less design eliminates the need for oil separation and oil filtration inside the compressor air end.

Specifications

• Models: STSV0302, STSV1302, STSV0502, STDV0303, and STDV0503
• Motor ratings: 3 HP or 5 HP
• Configuration: simplex or duplex
• Receiver capacity: 60 gallons for simplex models and 80 gallons for duplex models
• Air delivery at 100 PSIG: 8.8 SCFM for the 3 HP simplex model, 15.2 SCFM for the 5 HP simplex model, 17.6 SCFM for the 3 HP duplex model, and 30.4 SCFM for the 5 HP duplex model
• Electrical options: 208/230/460 volts, three phase, on applicable models; 208/230 volts, single phase, on the applicable 3 HP model
• Maximum high-pressure setting: 145 PSIG on applicable high-pressure units
• Outlet connection: 1/2-inch FNPT
• Operating inlet temperature: 34°F to 104°F, or 1°C to 40°C
• Control panel: UL 508A listed
• Lubrication: grease-filled bearings and self-lubricated scroll tip seals
• Overpressure protection: factory-set and sealed ASME safety valve

Detailed Description

The compressor uses two intermeshing spiral scrolls to compress atmospheric air. One scroll remains stationary while the other orbits around it without rotating. This motion creates crescent-shaped pockets at the outside edge of the scroll set. As the pockets travel toward the center, their volume decreases and the air pressure increases.

Air enters around the outside of the scroll assembly and leaves through the discharge opening at the center of the fixed scroll. Because compression is produced by the orbiting scroll action, inlet and discharge valves are not required within the air end.

The oil-less rotary scroll design supports continuous 100% duty-cycle operation. A self-lubricated tip seal helps maintain the seal between the scroll components without introducing oil into the compressed-air path. The scroll pumps are mounted above the receiver, while the motor, pulley, belt, beltguard, aftercooler, hoses, check valve, pressure gauge, pressure switch, regulator, and safety valve form the principal serviceable system components.

Simplex systems use one scroll pump. Duplex systems use two pumps and a larger receiver, allowing the system to provide the listed combined air delivery and stage operation according to demand and pressure conditions.

The hourmeter records actual compressor operating time. Use this reading to plan inspections, component replacement, bearing service, and tip-seal maintenance.

Safety

Read and retain the operating and maintenance instructions before assembling, installing, operating, or servicing the compressor. Failure to follow safety directions can cause personal injury, equipment damage, or property damage.

• Do not use the compressor by itself to provide breathing-quality air. Human-consumption applications require suitable inline filtration, purification, safety equipment, and alarm equipment that meet the applicable breathing-air requirements.
• Only qualified electricians should complete wiring and electrical connections. Follow applicable local and national electrical codes.
• Disconnect electrical power and relieve stored air pressure before servicing the compressor, receiver, piping, or controls.
• Keep the beltguard installed during operation. Do not operate the equipment with rotating components exposed.
• Never block the cooling-fan exhaust or place the compressor where hot air from another machine can enter the cooling airflow.
• Install the compressor in a clean, dry, well-lit, and well-ventilated area away from excessive dust, moisture, water, toxic gas, flammable gas, and direct sunlight.
• Do not install the unit where the ambient temperature exceeds 104°F or where humidity is high.
• Keep at least 24 inches of clearance above the compressor, on the drive-belt side, and on the other sides to permit inspection and maintenance.
• Do not use wood as a leveling shim. Use metal shims or suitable leveling pads when needed.
• Operate the tank condensate drain every day to remove collected liquid.
• Do not alter, block, relocate, or connect tubing directly to the safety valve. The valve must remain accessible and installed ahead of possible blockage points.

Setup and Installation

Receiving the Unit

1. Inspect the compressor immediately after delivery for shipping damage.
2. Check the nameplate to confirm the ordered model, voltage, and configuration.
3. Report visible transportation damage through the appropriate freight-claim process before putting the unit into service.
4. Remove shipping brackets, packing materials, and other temporary restraints before startup.

Positioning and Ventilation

1. Place the compressor on a firm, level surface in a clean and ventilated room.
2. Maintain the required clearance around the tank and pump assembly.
3. Install an exhaust fan with access to outside air if the compressor room is completely enclosed.
4. Make sure the cooling air can leave the room and is not recirculated from another heat-producing machine.
5. Level the tank with metal shims or leveling pads if necessary.

Electrical Connections

Have a qualified electrician connect the power supply and grounding conductor. Use solderless terminals and verify that the supply voltage, phase, fuses, circuit breakers, motor overload protection, and starter match the compressor nameplate and the wiring diagram supplied with the unit. System electrical information, including motor full-load-current ratings, must be taken from the wiring diagram for the specific compressor.

Air Piping

• Align piping carefully so the compressor connection is not strained, twisted, or forced into position.
• Use expansion loops or bends to reduce stress caused by hot and cold temperature changes.
• Support connected piping independently from the compressor to limit vibration and noise transfer.
• Do not use piping smaller than the compressor outlet connection.
• Connect the compressor outlet to the facility piping with flexible hose to isolate vibration.

Remote Intake Piping

When a remote intake is used, install the intake piping at the final operating location. Humid air can condense inside the intake line and send liquid water toward the pump. The supplied intake filter does not prevent liquid-water ingestion. Install drip legs with enough capacity and low enough air velocity to capture water before it reaches the filter. Drain the drip legs frequently so they remain effective.

Safety Valve

Tank-mounted compressors are supplied with the safety valve installed in the receiver. The valve setting must not exceed the tank maximum working pressure. Keep the valve ahead of any possible blockage point, including a shutoff valve, and do not connect it through additional tubing or piping. Manually operate the safety valve every six months to help prevent sticking or freezing.

Operation

Before Startup

1. Read and understand all safety instructions and warning labels.
2. Remove shipping materials and confirm that the compressor is level and stable.
3. Verify that power and grounding connections are secure.
4. Inspect all pressure connections for tightness.
5. Confirm that the safety valve and other pressure-protection components are installed correctly.
6. Verify the size and condition of fuses and circuit breakers.
7. Check that the inlet filter is correctly installed.
8. Close the receiver drain valve.
9. If a dryer is installed, power it on and open the appropriate valves.

Starting the Compressor

1. Switch on the electrical supply breaker.
2. Open the tank discharge valve completely.
3. Observe the compressor for excessive vibration, unusual sound, or air leakage.
4. Close the discharge valve completely after confirming normal initial operation.
5. Check the discharge pressure gauge and verify that pressure rises to the designated setting.
6. Open the tank outlet valve and confirm that the pressure switch starts the compressor as receiver pressure decreases.

If a three-phase compressor does not build pressure, switch the unit off and have a qualified electrician disconnect power and exchange two of the incoming phase connections inside the magnetic enclosure. Do not attempt phase changes while the equipment is energized.

Cleaning and Maintenance

Follow a maintenance program based on the hourmeter and actual operating conditions. Dust, high temperatures, heavy loads, corrosive surroundings, and other adverse conditions require more frequent inspection and service than the normal schedule.

Routine Tasks

• Daily: Drain moisture from the receiver tank.
• Monthly: Switch a desiccant dryer online and offline to verify operation, following the dryer’s service instructions.
• Every 2,500 hours or less: Inspect the inlet air filter, clean the blower fan, clean the fan duct, clean compressor fins, inspect or adjust the V-belt, and confirm safety-valve operation.
• Every 2,500 hours or less: Inspect the pressure gauge and confirm pressure-switch operation.
• Every 2,500 hours: Inspect the magnetic starter and replace it if the contact points are deteriorated.
• Every 10,000 hours on standard-pressure units: Replace the scroll tip seal and heat-insulation pipe as required, and have the bearings serviced by a service center.
• Every 5,000 hours on high-pressure units: Replace the scroll tip seal and heat-insulation pipe as required, and have the bearings serviced by a service center.

V-Belt Inspection

Adjust belt tension during the initial operating period and inspect it every 2,500 hours afterward. Correct tension is sufficient to prevent belt slip without placing unnecessary load on the motor or pump bearings. Keep the beltguard in place after inspection or adjustment.

Filters, Fans, and Fins

Inspect the inlet filter regularly and replace its element at 2,500-hour intervals or sooner when operating conditions are dusty. Keep the blower fan, fan duct, and compressor cooling fins free of accumulated debris so air can move freely through the cooling system.

Maintenance Parts

• Inlet air filter element: ST073921AV
• Scroll tip seal: Use the replacement part specified for the installed pump and pressure version.
• Belts: BT012001AV is listed for the 3 HP and 5 HP compressor assemblies.
• Pressure gauge: GA031901AV
• Standard-pressure safety valve: V-215100AV
• High-pressure safety valve: V-215106AV
• Standard-pressure switch: CW207573AV
• High-pressure switch: CW207595AV

Use the model nameplate, pump rating, pressure version, and supplied parts list to confirm replacement components before ordering or installing them.

Troubleshooting

Compressor Does Not Start

• Confirm that the electrical supply breaker is on.
• Check that the incoming voltage and phase match the unit nameplate.
• Inspect fuses, circuit breakers, overload protection, and starter components.
• Check whether receiver pressure has already reached the pressure-switch cutoff setting.
• Have a qualified electrician inspect wiring and controls before resetting or replacing electrical components.

Pressure Does Not Increase

• Check that the discharge valve and connected piping are configured correctly.
• Inspect pressure connections, hoses, and fittings for leaks.
• Confirm that the inlet filter is installed and not blocked.
• On three-phase units, verify correct phase rotation and reverse two incoming phases only with power disconnected by a qualified electrician.
• Check the pressure gauge and pressure switch for proper operation.

Excessive Noise or Vibration

• Stop the compressor and inspect for loose mounting hardware.
• Check that connected piping is independently supported and joined with flexible hose.
• Inspect belt condition and tension.
• Make sure the beltguard, fan duct, and other covers are secure.
• Arrange qualified service if abnormal vibration continues or if scroll-pump bearings may require service.

Water in the Air System

• Drain receiver moisture every day.
• Inspect dryer operation and valve positions when an optional dryer is installed.
• Inspect remote intake piping for condensation.
• Drain intake drip legs frequently and confirm that they are correctly sized for the airflow.

Warranty

The stated limited warranty applies to qualifying Powerex products purchased and used in the United States or Canada by non-OEM customers. The standard parts-and-labor period is 18 months from shipment, 12 months from documented startup, or 5,000 operating hours, whichever occurs first.

When premium warranty coverage is purchased with the system, the parts-and-labor period is 30 months from shipment, 24 months from documented startup, or 7,500 operating hours, whichever occurs first.

Powerex-branded compressor air ends and vacuum pumps have an additional parts-only period of 42 months from shipment, 36 months from documented startup, or 10,000 operating hours, whichever occurs first. Replacement air ends, pumps, motors, and other replacement parts have separate coverage periods and conditions.

Warranty coverage can be excluded when the product is installed or maintained contrary to written instructions, materially modified without approval, operated beyond its rated capacity, or damaged by improper operation, corrosion, abrasion, abnormal temperature, dirt, corrosive matter, ordinary wear, or negligent attendance. The applicable warranty terms control if they differ from general product descriptions.

Pros & Cons

Pros

• Oil-less scroll compression avoids oil separation and oil filtration in the air end.
• Continuous 100% duty-cycle capability supports demanding operating schedules.
• Vertical tank mounting provides a compact system arrangement.
• Simplex and duplex configurations support different airflow requirements.
• Receiver, aftercooler, controls, pressure gauge, safety valve, and air connections are integrated into the tankmount system.
• Greaseable bearings and an hourmeter support planned maintenance.

Cons

• Installation requires qualified electrical work and correctly supported air piping.
• Receiver moisture must be drained daily.
• Remote intake systems require drip legs and frequent drainage to prevent liquid-water damage.
• Tip-seal, bearing, belt, filter, cooling, and safety-device maintenance must follow the operating-hour schedule.
• The compressor cannot supply breathing-quality air without additional filtration, purification, safety, and alarm equipment.