Daikin IOM 1322-1, Installation, Operation And Maintenance Manual

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Unit Controller Operation
www.DaikinApplied.com 59 IOM 1322-1 • WATER-COOLED SCROLL COMPRESSOR
NOTE:
If a compressor with CoreSense Communications
fails in the field, the CoreSense module should
remain with the failed compressor so the manufacturer
can download the CoreSense data to assist with
determining the root cause of compressor failure.
DANGER
LOCKOUT/TAGOUT all power sources prior to starting, pressurizing,
de-pressuring, or powering down the Chiller. Failure to follow this warning
exactly can result in serious injury or death. Be sure to read and understand
the installation, operation, and service instructions within this manual.
WARNING
Disconnect the compressor three-phase power before removing the
terminal box cover. Removal of the terminal box cover will expose the three-
phase power connections. Contact with them can cause serious injury or
death. Servicing should be done by technicians familiar with this equipment.
Warning Codes (Green LED Flash Code)
• Code 1 – Loss of Communication: The module will flash
the green Warning LED one timeindicating the module
has not communicated with the master controller for
longer than 5 minutes. Once communication is reinitiated,
the Warning will be cleared.
• Code 2 – Reserved For Future Use
•
Code 3 – Short Cycling: The module will fl ash the green
Warning LED three times indicating thecompressor has
short cycled more than 48 times in 24 hours. A short cycle
is defined as compressor runtime of less than 1 minute.
The Warning will be activated when the “Short Cycling”
dipswitch (#10) is “off” or in the “down” position. When
fewer than 48 short cycles are accumulated in 24 hours
the Warning code will be cleared.
• Code 4 – Open/Shorted Scroll Thermistor. The module
will flash the green Warning LED four times indicating
the scroll NTC thermistor has a resistance value that
indicates an open/shorted thermistor (see Table 2 ). The
Warning
will be cleared when the resistance value is in
the normal range.
Alert/Lockout Codes (Red LED Flash Code)
Code 1 – Motor High Temperature: The module will flash
the red
Alert
LED one time indicating the motor PTC circuit
has exceeded 4.5K Ohms. A code 1 Alert will open the
M2-M1 contacts. The
Alert
will reset after 30 minutes and
the M2-M1 contacts will close if the resistance of the motor
PTC circuit is below 2.75K Ohms. Five consecutive Code
1 Alerts will lockout the compressor. Once the module has
locked out the compressor, a power cycle or Modbus reset
command will be required for the lockout to be cleared.
Code 2 – Open/Shorted Motor Thermistor: The module will
flash the red Alert LED two times indicating the motor PTC
thermistor circuit has a resistance value that indicates an
open/shorted thermistor chain (see Table 2 ). A Code 2 Alert
will open the M2-M1 contacts. The Alert will reset after 30
minutes and the M2-M1 contacts will close if the resistance
of the motor PTC circuit is back in the normal range. The
module will lockout the compressor if the trip condition exists
for longer than 6 hours. Once the module has locked out the
compressor, a power cycle or Modbus reset command will
be required to clear the lockout.
Code 3 – Short Cycling: The module will flash the red
Alert LED three times indicating the compressor is locked
out due to short cycling. A Code 3
Alert
will open the
M2-M1 contacts. Code 3 will be enabled when the “Short
Cycling” dipswitch (#10) is “on” or in the “up” position and
the compressor has exceeded the number of short cycles
configured by the user in a 24 hour period. Once the module
has locked out the compressor, a power cycle or Modbus
reset command will be required to clear the lockout.
Code 4 – Scroll High Temperature: The module will flash the
red Alert LED four times indicating the scroll NTC circuit is
less than 2.4K Ohms. A Code 4 Alert will open the M2-M1
contacts. The Alert will reset after 30 minutes and the M2-
M1 contacts will close if the resistance of the scroll NTC
circuit is higher than 5.1K Ohms. The module will lockout
the compressor if the number of Code 4 Alerts exceeds the
user configurable number of Code 4 events within a 24 hour
period. Once the module has locked out the compressor, a
power cycle or Modbus reset command will be required to
clear the lockout.
Code 5 – Reserved for Future Use
Code 6 – Missing Phase: The module will flash the red
Alert LED six times indicating a missing phase in one of the
three leads to the compressor. A Code 6 Alert will open the
M2-M1 contacts. The Alert will reset after 5 minutes and the
M2-M1 contacts will close if the missing phase condition is
not present. The module will lockout the compressor after 10
consecutive Code 6 Alerts. Once the module has locked out
the compressor, a power cycle or Modbus reset command
will be required to clear the lockout.
Code 7 – Reverse Phase: The module will fl ash the red
Alert LED seven times indicating a reverse phase in two
of the three leads to the compressor. A Code 7 Alert will
open the M2-M1 contacts. The module will lockout the
compressor after one Code 7 Alert. A power cycle or
Modbus reset command will be required to clear the lockout.