Ingersoll-Rand EP 20-ESP, Operators/Instruction Manual And Parts List

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2.5 ELECTRICAL INSTALLATION
Before proceeding further, we recommend that you
review the safety data in the front of this manual.
Locate the compressor data plate on the left end of
the cooler box next to the control box.
The data plate lists the rated operating pressure, the
maximum discharge pressure, the electric motor char-
acteristics and power.
Confirm that the line voltage and compressor name-
plate voltage are the same.
The standard control box meets the intent of NEMA 1
guidelines.
It will be necessary to make a hole in the control box
for the incoming power connection. Care should be
taken to not allow metal shavings to enter the starter
and other electrical components within the box. After
making the power inlet hole, all shavings and debris
must be removed from inside of control box before
power is turned on.
Incoming power should be connected per the electrical
schematic at the rear of this manual (See Section 6.0).
Confirm that all electrical connections are made and
tightened. Confirm that the control transformer is wired
correctly for supply voltage (See Figures 2.6-1 / 2.6-2).
Inspect the motor and control wiring for tightness.
Close the panel front.
2.6 VOLTAGE CONVERSION
IMPORTANT: This procedure should only be carried
out by a qualified electrician, electrical contractor or
your local Ingersoll Rand Distributor or Air Center.
NOTE: This procedure applies only to units manufac-
tured to multi-voltage specifications. Motor nameplate
must indicate multiple voltages.
PROCEDURE:
Put main disconnect in the OFF position, lock and tag
(See Figure 2.6-3).
Open the motor junction box on the side of the motor.
Reconnect the motor to the desired voltage. Use the
connection decal provided on the motor as a guide.
Reconnect the primary side of the control transformer
for the desired voltage, as shown on the control trans-
former wiring decal.
After referring to the heater chart decal located in the
starter box panel, remove the original heater packs
and replace them with the appropriate heater packs
based on horsepower and voltage.
Again referring to the heater chart, set the dial position
of the overload relay to the appropriate setting.
Make sure all wiring connections are tight.
Put main disconnect in the ON position and check
motor rotation, as outlined in Section 2.7 of this manu-
al.
FIGURE 2.6-1 CONTROL
TRANSFORMER
CONNECTIONS - 60HZ
FIGURE 2.6-3 MAIN DISCONNECT
LOCKED AND TAGGED
PRIMARY
SECONDARY
115V
200V
LEVER
TAG
KEY LOCK
HASP
FIGURE 2.6-2 CONTROL
TRANSFORMER
CONNECTIONS - 50 HZ
PRIMARY
SECONDARY