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EWWD440~850AAYNNO**
Packaged water-cooled water chillers
4PW25558-1B
Installation and operation manual
31
■
Do not use fuses other than ones of proper capacity.
Using wires, in stead of fuses could result in equipment
damage or fire.
■
Check the open-closed state of all valves before usage.
Check the valves in accordance with instructions given
in the operation manual and nameplate. If valves are
opened or closed when they should not be, water may leak, and
in worse cases, the equipment may catch fire or explode.
Before inspecting
■
Always inform other persons when maintenance starts.
■
Recheck all items in chapter
"Safety considerations" on page 1
■
When the unit is being operated from a remote controller, select
"LOCAL" on the graphic panel display "OPERATION" screen.
Make sure that the unit does not start. Check for possible
remote signals in particular.
■
Place a "BEING SERVICED NOW" sign on the unit front and on
the central remote controller which indicates that maintenance is
in progress.
Periodical inspection
■
Check the water.
Drop some water from the water drainage plug.
If the water is dirty, replace all water in the system.
■
Inspect the water piping system for mixing of air.
Even though the air purge is performed at the beginning, mixing
of air into the system may occur. Perform on air purge at regular
intervals.
■
Perform cleaning of the inside of the condenser and evaporator
when needed.
Depending on operation conditions, in case the difference
between chilled water outlet temperature and saturated
temperature corresponding to the suction pressure and
difference between condenser water outlet temperature and
saturated temperature corresponding to the discharge pressure
exceeds 5 to 6°C, the periodical cleaning of the inside of the
heat exchanger tube of the condenser or evaporator must be
increased.
For further information, consult your dealer.
■
Make check of the electric system.
Check the electric system for looseness on terminals and for
deterioration/discoloration of wires.
Refrigerant and lubrication oil
■
Refrigerant and lubrication oil to be used for this unit are as
follows:
CAUTION
Use chilled (hot) water and condenser water that
conforms to water quality standards.
Poor quality water could result in water leaks.
Name
Specified quantity
Refrigerant
R134a
Stated in
manufacturer’s label
Refrigerating machine oil
FVC68D
CAUTION
Do no mistake type of refrigerant and of
lubrication oil.
It may result in fire or explosion.
It is forbidden to discharge refrigerant into the
atmosphere. It is required by law to collect, transport
and discard the refrigerant in accordance with
“chlorofluorocarbon collection and destruction” law.