Maintenance and Operation
NOTICE
Refrigerant Piping: A qualied 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 qualied professional’s refrigerant piping system design.
NOTICE
Chilled Water Piping: A qualied 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 qualied professional’s piping
system design.
• All access panels must be in place when unit is in
operation.
• For maximum eciency, the condenser coil must be
kept clean. Periodic inspections, depending on local
conditions are recommended. If it is necessary to clean
the condenser coil, use a common garden hose.
• Never operate the unit without filters installed in the air
handler.
Crankcase Heaters
All units are equipped with crankcase heaters that are factory
wired to operate whenever the main power supply to the
unit is “ON” and compressors are “OFF”. Before starting the
equipment after prolonged shutdown or at the time of initial
start-up, be sure that the circuits to the condensing units are
closed for at least 24 hours.
Contactor
The contactor is an electrical switch which operates the
compressor and condenser fans. Relay activates contactor
when safety circuit is made.
High Pressure Switch (HPC)
Opens the contactor circuit on high refrigerant pressure -
Manual Reset - check for cause of tripping before putting unit
back in service.
WARNING
Do not wire around the high pressure switch. 15 ton unit compressors
are not provided with internal pressure relief means. Failure to follow this
warning can cause an explosion resulting in personal injury or death.
Low Pressure Switch (LPC)
Acts as safety against loss of refrigerant.
Relay (R)
Energizes the compressor contactor when safety circuit is made.
Replacement Parts
To nd your local Daikin Applied Certied Parts Distributor, go
to www.DaikinApplied.com and select Parts Locator.
Charge Information
Refer to the appropriate Charging Charts starting on page 21.
Wiring Diagrams
Refer to the appropriate Wiring Diagrams starting on page 27.
Troubleshooting
Refer to the troubleshooting chart Table 15 on page 18.
IM 962-4 • AIR-COOLED SPLIT SYSTEM CONDENSERS 20 www.DaikinApplied.com
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