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Performing Service 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.
WARNING
Moving machinery and electrical power hazards . May
cause severe personal injury or death .
Disconnect and lock
off all power before servi ng equipment.
CAUTION
Sharp edges are inh rent to sheet metal parts, screws,
clips, and similar items . May cause personal injury .
Exercise caution when servicing equipment.
IMPORTANT
Chilled Water Piping:
A qualified Architect or Systems
HVAC Design Engineer familiar with piping design, local
codes and regulations, must provide piping design. The
following manufacturer recommendations serve as a general
guide and should not replace a qualified professional’s
piping system design.
IMPORTANT
Refrigerant Piping:
A qualified Architect or Systems HVAC
Design Engineer familiar with refrigerant piping design, as
well as local codes and regulations, must provide refrigerant
piping design. The following manufacturer recommendations
serve as a general guide and should not replace a qualified
professional’s refrigerant piping system design.
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.
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 or vacuuming.
• Lubricate the motor and fan shaft bearings.
• Align or replace the belts as required.
• Clean or replace the filters as required.
NOTE:
A partially full sight glass is not uncommon at part
load conditions. A varying amount of bubbles may be
noticeable in the sightglass, which is normal.
• 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.
• Check the condenser fans and tighten their setscrews.
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
98
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