Technical information

Page: 20
VL Series Portable Chillers, 2 to 40 Tons UGH021/0301
d. Toggle the CHILLER
ON switch. This will
quickly cycle the
electrical motor
“on” and then “off”.
e. Observe the motor
shaft. When the
CHILLER ON switch
is turned “on”, the
motor shaft will
rotate. When the
CHILLER ON switch
is turned “off”, the
motor shaft will
slowly “coast” to a
stop. As the shaft
slows to a stop, the
operator must
identify its rotation.
Correct rotation
(correct phase) is
“clockwise”, when
viewed from the
rear of the motor.
Incorrect rotation is “counter-
clockwise” (incorrect phase) when viewed from the
rear of the motor. If the shaft does not rotate when
the PUMP switch is toggled, the operator must
identify the cause as outlined in this manual’s
troubleshooting and repair section.
f. If the motor shaft is phased correctly (shaft turns in
a clockwise direction), continue with step C. If the
motor shaft is NOT phased correctly (shaft turns in
a counter-clockwise direction), continue the
procedure with step 2.
2. If the motor shaft is NOT phased correctly, the operator
must:
a. Disengage the electrical power supply to the unit at
the disconnect switch. Follow proper lockout
procedures before proceeding. Verify the POWER
light on the instrument display is off.
b. With the electrical power supply is disengaged,
reverse any two power leads of the power cord at
the disconnect terminals.
c. Note: reversing any two power leads of the power
cord will correctly phase an incorrectly phased
Figure 3.2C
Motor shaft
Vent slots
Figure 3.2B
Electric motor
Pump