EWWD440~850AAYNNO**
Packaged water-cooled water chillers
4PW25558-1B
Installation and operation manual
17
B
EFORE
TEST
RUN
For your safety and to ensure the lifetime of the unit, make sure to
check before test run what follows.
Refer to
"Safety considerations" on page 1
as well.
If any imperfection is found during this check, do not perform test run
and consult your dealer.
Checking the electric circuit (Check the following
before power-up)
■
Sufficient insulation resistance of the circuit
Before power-up, be sure to confirm the insulation resistance
between ground and each phase and between respective
phases.
Use a 500 V DC insulation-resistance tester. Reference value is
≥
10 M
Ω
.
■
Correct connection of power supply
Make sure that there is no reverse phase or phase interruption.
Check the power connection section (terminal block) for
looseness.
■
Earthing work
Make sure that earthing work has been performed according to
the wiring diagram supplied with the unit.
■
Cleaning inside the switch box
Remove wire scrap, chips, etc. produced during installation work
and power supply work before powering up the unit.
Checking the bridge wiring
■
Interlock circuit of the pump is connected
Make sure that the interlock signal of the pump is connected.
This contact is one of the protective devices of the unit and very
important.
■
Contact specification is correct
Check that the voltage circuit is connected to the voltage free
Run/Stop circuit.
Recheck that contact capacity is correct.
■
Connection of bridge wiring
Make sure that there is no cross connection or omission of
connection, etc.
■
No looseness in terminal connection
Make sure that there are no loose terminal connections.
Looseness may present problem in exchange of I/O signals and
further lead to fire.
Check at first electrification
■
Correct power supply specification
Make sure that the voltage is within ±10% of the value stated in
machine label.
Make sure that the frequency is within ±2% of the value stated in
machine label.
The voltage imbalance level among 3 phases must be within
±2% of the rated voltage.
■
In order to avoid compressor damage, it is necessary to switch
on the crankcase heater for at least 6 hours before starting the
compressor.
WARNING
Do not dismantle or modify the touch panel.
Electric shock or fire may result.
Do not replace the built-in lithium battery by yourself.
Incorrect replacement methods may result in explosion of
the battery.
CAUTION
Do not expose the graphic panel display to direct
sunlight.
Liquid crystal inside the graphic panel display deteriorates
by ultraviolet light in sunlight.
Do not expose the graphic panel display to high/low
temperature.
Exposure to temperatures
≤
–20°C may result in breaking
of the panel due to coagulation of liquid crystals.
Exposure to temperature of
≥
60°C can cause the liquid
crystal not to return to original isotropic liquid.
Do not wipe the graphic panel display with thinner or
organic solvent.
This may result in damage to the product.
WARNING
Use prescribed cables for wiring, and make sure
that connections are secure.
Fix the wiring correctly.
It must be impossible that external force on cables has
influence on terminal connections.
Incomplete connection or fixing can lead to heat
generation or fire.
CAUTION
Provide proper grounding for the unit.
Do not connect the earth wire to gas piping, water
piping, lightning rod, earth wire of telephones, etc.
Incomplete earthing may result in electric shock.
CAUTION
Do not leave unnecessary objects inside the
switch box.
Remove wire scrap, chips, tools, etc. before powering
up the unit. It may result in electric shock or fire.
CAUTION
Do not perform any forced operation by short-
circuiting protective devices.
Do not perform operation with interlock circuit of the
pump short-circuited. It may result in explosion or
damage to the equipment.
CAUTION
Observe the specified power source.
If you use a power supply other than specified on the
machine rating plate, it could result in fire or electrical
shock.
