Unit Storage - Daikin RDT Installation And Maintenance Manual

Unit Storage

Location
The Daikin Rooftop Packaged System Unit is an outdoor
unit. However, the schedule may dictate storage either on the
ground or in its final position at the site. If the unit is stored on
the ground, additional precautions should be taken as follows:
• Make sure that the unit is well supported along the length
of the base rail.
• Make sure that the unit is level (no twists or uneven
ground surface).
• Provide proper drainage around the unit to prevent
flooding of the equipment
• Provide adequate protection from vandalism, mechanical
contact, etc. The condenser fins are particularly
vulnerable to damage by even light contact with ground
based objects.
• Make sure all doors are securely closed.
• If isolation dampers are provided, verify that they are
properly installed and fully closed to prevent the entry
of animals and debris through the supply and return air
openings.
• Units without isolation dampers should be fitted with
covers over the supply and return air openings.
Preparation
Supply (and Return) Fans
1. Move the motor base to check and lubricate slides and
leadscrews.
2. Remove the drive belts, tag them with the fan name and
unit serial number, and store them in a conditioned space
out of direct sunlight.
3. Turn the supply and return fan manual motor protectors
(MMP) to the OFF position.
4. Once every two weeks, rotate the fan and motor shafts.
Mark the shaft positions first to make sure they stop in a
different position.
5. Depending on local climatic conditions, condensate
may collect on components inside the units. To prevent
surface rust and discoloration, spray all bare metal parts
with a rust preventive compound. Pay close attention to
fan shafts, sheaves, bearings, and bearing supports,
IM 893-10 • ROOFPAK SINGLEZONE UNITS
Cabinet Sections
Once a month, open a door on each section and verify that no
moisture or debris is accumulating in the unit.
Cooling Circuits
The steps below are necessary only if the unit has been
started.
1. Turn the compressor manual motor protectors (MMP) to
the OFF position.
2. Close the discharge and liquid line refrigerant service
valves on each circuit.
3. Tag the valves as a warning for the technician who
restarts the units.
Gas Furnace
If the unit is equipped with a gas furnace, close the gas shutoff
valve and open furnace control switch S3.
Control Compartment
1. Daikin recommends that the electronic control
equipment in the unit be stored in a 5% to 95% RH (non-
condensing) environment.
2. It may be necessary to put a heat source (light bulb) in
the main control panel to prevent the accumulation of
atmospheric condensate within the panel.
3. The location and wattage of the heat source is
dependent on local environmental conditions.
4. Check the control compartment every two weeks to
check that the heat source is functional and is adequate
for current conditions.
Restart
After extended storage, perform a complete start up. Inevitable
accumulations of dirt, insect nests, etc. can contribute to
problems if not cleaned out thoroughly prior to start up. In
addition, thermal cycling tends to loosen mechanical and
electrical connections. Following the startup procedure helps
discover these and other issues that may have developed
during the storage interval.
Gas Furnace
For information on maintenance of the gas furnace, refer to
IM 684 or IM 685.
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aInTenanCe
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