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IM 738-2
113
Maintenance:
Servicing Control Panel Components
Maintenance
Installation and maintenance must be performed only by
qualified personnel who are experienced with this type of
equipment and familiar with local codes and regulations.
Servicing Control Panel Components
Disconnect all electric power to the unit when servicing
control panel components. Before servicing, always inspect
units for multiple disconnects to ensure all power is removed
from the control panel and its components.
Planned Maintenance
Preventive maintenance is the best way to avoid unnecessary
expense and inconvenience. Have this system inspected at
regular intervals by a qualified service technician. The
required frequency of inspections depends upon the total
operating time and the indoor and outdoor environmental
conditions. Routine maintenance should cover the following
items:
•
Tighten all belts, wire connections, and setscrews.
•
Clean the evaporator and condenser coils mechanically or
with cold water, if necessary. Usually any fouling is only
matted on the entering air face of the coil and can be
removed by brushing.
•
Lubricate the motor and fan shaft bearings.
•
Align or replace the belts as needed.
•
Clean or replace the filters as needed.
•
Check each circuit's refrigerant sightglass when the circuit is
operating under steady-state, full load conditions. The
sightglass should then be full and clear. If it is not, check for
refrigerant leaks.
Note:
A partially full sight glass is not uncommon at part load
conditions.
•
Check for proper superheat.
•
Check for blockage of the condensate drain. Clean the
condensate pan as needed.
•
Check the power and control voltages.
•
Check the running amperage of all motors.
•
Check all operating temperatures and pressures.
•
Check and adjust all temperature and pressure controls as
needed.
•
Check and adjust all damper linkages as needed.
•
Check the operation of all safety controls.
•
Examine the gas furnace (see Bulletin No. IM 684 or
IM 685).
•
Check the condenser fans and tighten their setscrews.
•
Lubricate the door latch mechanisms.
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.
WARNING
Moving machinery and electrical power hazards. May cause
severe personal injury or death.
Disconnect and lock off all power before servicing equipment.
CAUTION
Sharp edges are inherent to sheet metal parts, screws, clips,
and similar items. May cause personal injury.
Exercise caution when servicing equipment.
WARNING
Hazardous voltage. May cause severe injury or death.
Disconnect electric power before servicing equipment. More
than one disconnect may be required to de-energize the unit.
Summary of Contents for RDT-135c
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