Installation - Electrical - Conair EP2 series User Manual

Installation - Electrical

All wiring must comply with local codes and the
National Electric Code. Minimum circuit amps (MCA)
and other unit electrical data are on the unit
nameplate. A unit specific electrical schematic ships
with the unit. Measure each leg of the main power
supply voltage at the main power source. Voltage
must be within the voltage utilization range given on
the drawings included with the unit. If the measured
voltage on any leg is not within the specified range,
notify the supplier and correct before operating the
unit. Voltage imbalance must not exceed two
percent. Excessive voltage imbalance between the
phases of a three-phase system can cause motors to
overheat and eventually fail. Voltage imbalance is
determined using the following calculations:
%Imbalance = (Vavg – Vx) x 100 / Vavg
Vavg = (V1 + V2 + V3) / 3
Vx = phase with greatest difference from Vavg
For example, if the three measured voltages were
442, 460, and 454 volts, the average would be:
(442 + 460 + 454) / 3 = 452
The percentage of imbalance is then:
(452 – 442) x 100 / 452 = 2.2 %
This exceeds the maximum allowable of 2%.
There is a terminal block for main power connection
to the main power source. The main power source
should be connected to the terminal block through
an appropriate disconnect switch. There is a separate
lug in the main control panel for grounding the unit.
Check the electrical phase sequence at installation
and prior to start-up. Operation of the compressor
with incorrect electrical phase sequencing will result
in mechanical damage to the compressors. Check
the phasing with a phase sequence meter prior to
applying power. The proper sequence should read
"ABC" on the meter. If the meter reads "CBA", open
the main power disconnect and switch two line leads
on the line power terminal blocks (or the unit
mounted disconnect). Do not interchange any load
leads that are from the unit contactors or the motor
terminals.
WARNING: This equipment contains hazardous
voltages that can cause severe injury or death.
WARNING: This equipment contains refrigerant under
pressure. Accidental release of refrigerant under
pressure can cause personal injury and or property
damage.
WARNING: This equipment may contain fan blades or
other sharp edges. Make sure all fan guards and other
protective shields are securely in place.
WARNING: The exposed surfaces of motors, refrigerant
piping, and other fluid circuit components can be very
hot and can cause burns if touched with unprotected
hands.
CAUTION: Disconnect and lock out incoming power
before installing, servicing, or maintaining the
equipment. Connecting power to the main terminal
block energizes the entire electric circuitry of the unit.
Electric power at the main disconnect should be shut
off before opening access panels for repair or
maintenance.
CAUTION: Wear eye protection when installing,
maintaining, or repairing the equipment to protect
against any sparks, debris, or fluid leaks.
CAUTION: Wear protective gloves when installing,
maintaining, or repairing the equipment to protect
against any sparks, debris, or fluid leaks.
CAUTION: Wire the unit ground in compliance with
local and national codes.
CAUTION: The unit requires the main power to remain
connected during off-hours to energize the
compressor's crankcase heater. Disconnect main
power only when servicing the chiller. The crankcase
heater should remain on when the compressor is off to
ensure liquid refrigerant does not accumulate in the
compressor crankcase. Connect main power at least
24 hours prior to initial startup.
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