Daikin RoofPak RPS Series, Руководство по установке и обслуживанию

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IM 926-3 • ROOFPAK APPLIED SYSTEMS 108 www.DaikinApplied.com
Maintenance and Service
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. Once every two weeks, rotate the fan and motor shafts.
Mark the shaft positions first to make sure they stop in a
different position.
4. 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,
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. Provide that each circuit is properly pumped down.
2. Pull the fuses to each compressor (store them in the
control cabinet)
3. Close all the refrigerant service valves on each circuit
4. 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 Applied 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
provide that the heat source is functional and is adequate
for current conditions.
Winterizing Water Coils
Coil freeze-up can be caused by such things as air stratification
and failure of outdoor dampers and/or preheat coils. Routine
draining of water cooling coils for winter shutdown cannot be
depended upon as insurance against freeze-up. Severe coil
damage may result. It is recommended that all coils be drained
as thoroughly as possible and then treated in the following
manner.
• Fill each coil independently with an antifreeze solution
using a small circulating pump and again thoroughly drain.
• Check freezing point of antifreeze before proceeding
to next coil. Due to a small amount of water always
remaining in each coil, there will be a diluting effect.
The small amount of antifreeze solution remaining in
concentrated enough to prevent freeze-up.
NOTE: Carefully read instructions for mixing antifreeze
solution used. Some products have a higher freezing
point in their natural state than when mixed with water.