10
ELECTRICAL POWER SUPPLY (CONT’D)
Figure 1-2 Duplex Wiring Diagram
CAUTION
Wiring must be such that when viewing compressor from opposite shaft end, rotation of shaft is
clockwise as shown by arrow on guard. Wrong direction rotation for any length of time will result in
damage to compressor.
GROUNDING INSTRUCTIONS
This product should be connected to a grounded, metallic, permanent wiring system, or an
equipment-grounding terminal or lead on the product.
AIR LINE PIPING
Connection to air system should be of the same size, or larger, than discharge pipe out of unit.
The table gives recommended minimum pipe sizes. A union connection to the unit and water
drop leg is recommended. Install a flexible connector between the discharge of the unit and the
plant air piping. Plant air piping should be periodically inspected for leaks using a soap and water
solution for detection on all pipe joints. Air leaks waste energy and are expensive.
Minimum Pipe Sizes For Compressor Air Lines
(Based on clean Smooth Schedule 40 Pipe)
MODEL 25’
50’ 100’ 200’ 300’
R70A
1-1/4” (1-1/2”) 1-1/4” (1-1/2”) 1-1/4” (1-1/2”)
1-1/2” (2”)
1-1/2” (2”)
Values in ( ) are for duplex unit.
WARNING
Never use plastic pipe or improperly rated metal pipe. Improper piping material can burst and
cause injury or property damage.
312CAD546-B
(Ref. Drawing)
