Daikin WDC Installation, Operation And Maintenance Manual page 24

Long Term Storage
This information applies to new units being stored waiting for
startup or to existing units that may be inoperative for a long
period.
The chiller must be stored indoors and protected from any
damage or corrosion. A Daikin Applied service representative
must perform an inspection and leak test of unit on minimum
quarterly schedule, to be paid by the owner or contractor.
Daikin Applied will not be responsible for any refrigerant
loss during the storage time or repairs to unit during period
of storage, or while moving the unit from original location to
storage facility and back to new installation location. Refer to
"Table 1: Equipment Room Guidelines" on page 8.
The following tasks must be performed:
1. As discussed above, the first and foremost task is to
leak test the unit when it is in its final resting place. If
any leaks exist, repair them immediately. After the unit is
stored, perform a periodic leak test.
2. It is possible that the unit could be bumped, hit or
otherwise damaged while in storage; so in addition to
leak testing, a visual overall inspection should be done.
3. If there is concern about the possibilities of damage
and loss of charge during storage, the customer can
pay to have the charge removed and stored in recovery
cylinders. If this is done, pressurize it to about 20 psi with
nitrogen. Monitor and maintain the pressure. Install a
pressure gauge that can easily be read or tie in a remote
alarm that can be monitored if pressure reduces. This
is desirable if the unit is stored with refrigerant or with a
nitrogen holding charge.
4. If the unit has been shipped and not yet installed, keep it
pumped down (as shipped from the factory) and close all
refrigerant valves.
IOM 1281-2 • CENTRIFUGAL WATER CHILLERS
5. Keep oil sump valves closed to avoid refrigerant
migration to the oil sump. Over a long term, the
refrigerant will migrate to the oil tank and displace the oil.
The oil will spill over in to the evaporator through the vent
line and when the unit is powered up and the heaters
turned on, the refrigerant will boil out and the sump will
be empty.
6. Clean and dry the unit and look for any chipped paint.
Touch up as required to prevent rust.
7. If the storage area is subject to a high humidity, consider
a shrink wrap or water resistant covering of some sort.
Desiccants must be placed inside electrical panels and
starters (mounted or shipped loose) and be renewed as
recommended by manufacturer.
8. The Human Machine Interface (HMI), which is shipped
loose, should be secured in a dry area.
9. Regardless of the temperature of the storage area,
make sure all vessel tubes are drained and blown dry to
prevent the minerals in the standing water, plus oxygen
present, causing tube pitting. This includes the oil cooler
and water piping.
10. Restart by Daikin Applied service technicians will be
required and paid to Daikin Applied by the owner or
contractor. It is prudent to take photos when the unit is
stored to show that the conditions of storage have been
met. It is recommended that periodic inspections and
leak testing are performed during an extended storage
period. Document all inspection reports and abnormal
conditions found. If the unit has been in operation,
the run-time hours and number of starts must be
documented prior to storage, along with the date the unit
was taken out of operation.
If the temperature of where the chiller is located is expected to
exceed 110°F (43.3°C), then the refrigerant must be removed
For additional tasks required, contact Daikin Applied service.
24
Installation
CAUTION
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