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Model Number RL03S-D

 

Bootstrap Compressor • Installation and Operating Instructions

Midwest Pressure Systems, Inc.

RAV

Rev. 0

MPS

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MPS Logos

12/5/91

1/2" Square

3/4" Square

1" Square

1-1/4" Square

1-1/2" Square

2" Square

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Mount the Model RL03S-D Bootstrap Compressor on a 
horizontal surface. Other mounting orientations are not 
recommended.   The booster system vibrates while operating, so 
use the four 1/2” mounting holes, shown in the diagram to the 
right, to bolt it to a solid surface.

1

Connect your shop air line to the 1/4” FNPT air inlet filter on the 
front of the booster.  A shutoff valve can be installed upstream of 
the filter for convenient removal of the system for maintenance. 
The booster has a built-in discharge pressure regulator. Do not 
install a supply pressure regulator. Lowering the supply pressure 
reduces the efficiency of the system. The unit is permanently 
lubricated.  

Use of an inlet lubricator will void the 

warranty. The maximum inlet pressure is 150 psig.

2

Attach discharge line to the 1/2” FNPT ball valve located in 
front of the receiver tank.  

If the application requires a 

lubricator, make sure the lubricator is installed 
downstream of the booster.

3

The discharge pressure regulator is set by the black, snap- 

lock knob mounted on the top of the unit. Pull up on the 

knob to unlock it. Adjust the knob by turning it clockwise for 

a higher discharge pressure (up to a maximum of 240 psig), 

or counterclockwise for a lower discharge pressure. Inlet 

pressure is read on the gauge to the left hand side. The 

second gauge indicates discharge pressure. Supply shop air 

to the booster and it will start to operate. Set the regulator to 

attain the desired discharge pressure, and push down on the 

regulator knob until it “clicks” to lock the regulator on that 

setting. The regulator is self-relieving. When the discharge 

pressure setting on the regulator is reduced, the higher 

pressure stored in the system will vent through the regulator 

until pressure equilibrium is reached. 

If the inlet pressure 

is higher than 120 psig, it is possible to set the 

regulator so the booster exceeds the maximum 

discharge pressure of 240 psig. Do not operate the 
booster under these conditions. It is designed to 
operate continuously at a maximum discharge 
pressure of 240 psig. 

 

5

The Bootstrap Compressor will operate as long as there is 

demand for high pressure air. When there is no demand, the 
booster will “stall” at the pressure set by the booster’s discharge 
regulator. The stalled condition consumes no energy and does 
not damage the booster. The booster will start up automatically 
when the pressure falls slightly as a result of demand for high 

7

Mounting Bolt Pattern:

 7.5” 

 6.5” 

Inlet port
1/4” FNPT

Discharge port
1/2” FNPT

The accumulator tank has a 1/4” ball valve to drain condensate. A 
drain line or automatic drain valve can be attached to this valve 
when needed. Close the valve before starting booster.

4

The accumulator is rated for 350 psig and includes a relief valve 
set for 250 psig. 

This relief valve was selected to prevent 

operation of the booster above its maximum 
allowable discharge pressure of 240 psig. 

8

For maximum high pressure air storage,Bootstrap Compressor’s 
regulator to charge the accumulator to 240 psig. Set the 
secondary regulator on the discharge line to the desired 
discharge pressure. This allows for greater accumulator storage 
capacity, and minimizes pressure fluctuations in the system. 
Make sure that any downstream components are rated for the 
accumulator pressure, or are protected by a relief valve in case 
the secondary regulator fails. 

6

250 psig 
Pressure 
Relief Valve

Secondary 
Regulator

Midwest Pressure Systems, Inc.

850 Transport Drive, Valparaiso, IN 46383
Phone 219-462-0070  Fax 219-318-2277

www.midwestpressuresystems.com

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