8
Subject to change without notice.
power source. The second function is to use the
measured voltage to select the control circuit type
208 or 230 volt. Selecting the type of voltage for
the control circuit based the measured voltage
helps to stien the control voltage to the control
components (motor contactor, time delays, etc.).
460 – Volt Applications
In a 460 Volt AC application, the meter is only used
for an over/under applied voltage check. If the
applied voltage from the main power source
is less than 420 Volts AC or greater than 500
Volts AC, do not operate the unit until power is
corrected at the main power source.
3. Review the following steps to insure that
electrical phasing and voltage setup is correct
prior to initial start-up and unit operation.
4. Proper phasing of the electrical power wiring
is critical for proper rotation of the motors and
operation of the compressor. Electrical phase
sequence monitors are standard on all three-
phase 12 Ton Spot Cooler A/C units.
(a) Connect the power cable to the correct
power source as veried by the unit’s data
plate shown in Figure 1 or at the Camlock
connection ttings.
(b) Turn ON the main power to the unit.
(c) As soon as power is applied to the unit,
check two items immediately.
(d) Read the voltage on the Voltage Meter.
(e) Next, verify the Red Out-of-Phase Indicator
(OPI) located on the front of the control
panel is not illuminated as viewed from the
control panel Figure 2.
(f) At this point, TURN OFF POWER to the
unit at the main power source.
(g) If the Red OPI light is illuminated, switch
any two leads of the three main power wires
connected from the main power source.
CAUTION: Do not switch Green. Green is
Ground.
(h) For 208 – 230 volt applications, if the
displayed voltage is greater than 190 VAC
and less than 219 volts AC, set the Control
Voltage Selector Switch (CVSS) to the 208
Volt position.
(i) For 208 – 230 volt applications, if the
displayed voltage is greater than 219 VAC
and less than 250 volts AC, set the Control
Voltage Selector Switch (CVSS) to the 230
Volt position.
(j) Turn main power ON again. When the
Red OPI indicator light is o, the phase
sequence is correct.
(k) Turn OFF main power at this point and
lockout the disconnect switch until the
supply and return air ducting is connected.
CAUTION:
1. IN 208 – 230 VOLT APPLICATIONS, DO
NOT OPERATE THE UNIT IF THE APPLIED
VOLTAGE IS LESS THAN 190 VAC OR
GREATER THAN 250 VAC.
2. IN 460 VOLT APPLICATIONS, DO NOT
OPERATE THE UNIT IF THE APPLIED
VOLTAGE IS LESS THAN 420 VAC OR
GREATER THAN 500 VAC.
3. These units will not operate if phase sequence
is not correct.
DUCT CONNECTIONS
Supply Air Duct
The supply air duct connections are labeled “AIR
OUT”. The connection size is 14” in diameter.
Connect the exible air ducting as follows:
1. Attach the exible air ducting to the unit’s duct
collars making sure that air will not leak past
the connection collar by using appropriate
round exible ducting clamps.
2. Route the ducting as straight as possible to the
space being conditioned avoiding excessive
turns and pinches in the ducting.
