Daikin MicroTech III Operation Manuals page 82

Variable Compressor Oil: Problem
If the variable speed compressor has been operating at the High
Oil Boost value for the Oil Boost Timing period and the low oil
input (EMC-X3) is still open the variable speed compressor is
stopped and a Low Oil problem alarm is generated . The alarm is
also generated if the oil boost sequence becomes active 5 times
in a 24 hour operating period .
High Pressure Circuit 2
Normal variable speed compressor control is limited when
a high discharge pressure conditions occur on the variable
speed compressor circuit . If the variable speed compressor
is operating and the discharge pressure (PTD) is greater
than 525 PSI, a High Pressure Unloading Control Event
is generated and the VFD compressor is slowed every 10
seconds until either the discharge pressure falls to less than
525 PSI or remains higher than 575 PSI for 10 minutes . If
the discharge pressure is above 575 PSI for 10 minutes the
variable speed compressor is shut off and a High Pressure
Problem alarm is generated . If the OAT is below 45F at the
time the variable speed compressor is shut off immediately
and a High Pressure Problem alarm is generated anytime the
discharge pressure rises above 575 PSI . The alarm must be
manually cleared .
High Pressure Circuit 1
Normal variable speed compressor control is limited when
a high discharge pressure conditions occur on the variable
speed compressor circuit . If the variable speed compressor
is operating and the discharge pressure (PTD) is greater
than 525 PSI, a High Pressure Unloading Control Event is
generated and the variable speed compressor is slowed every
10 seconds until either the discharge pressure falls to less
than 525 PSI or remains higher than 575 PSI for 10 minutes .
If the discharge pressure is above 575 PSI for 10 minutes the
variable speed compressor is shut off and a High Pressure
Problem alarm is generated . If the OAT is below 45F at the
time the variable speed compressor is shut off immediately
and a High Pressure Problem alarm is generated anytime the
discharge pressure rises above 575 PSI . The alarm must be
manually cleared. (Not Yet Applicable – except normal fixed
circuit high pressure switch alarm still applies
OM 920-6 • MICROTECH UNIT CONTROLLER
No Water Flow Problem - (Water Flw Sw: Problem)
(Self Contained only)
When a unit is equipped with a water flow switch WFS, the No
Water Flow problem occurs when lack of water flow is indicated
by an open water flow switch or a network signal and all of the
following conditions are true:
• Lack of water flow is indicated by an open water flow
switch or a Network signal
• Either of the following is true:
• The Bypass Valve has been opened greater than 50% for
more than the Bypass Valve Timer
• A water side economizer is installed and its position is
greater than 50%
• Unit is not in the Off, Start or Recirc operating state
When the No Water Flow problem occurs, the unit continues
to operate however cooling provided by compressors disabled .
When all of the alarm condition are no longer present, the
No Water Flow problem normally clears automatically and
normal unit operation resumes . If the alarm occurs three times
between 2:00 am of one day and 2:00 am of the next day, it
becomes necessary to manually clear the alarm .
Water Regulating Valve Problem - (Water RegVlv:
Problem) (Self Contained only)
When a unit is equipped with the head pressure control
option, the Water Regulating Valve Problem occurs when the
greater of the two refrigerant pressure readings drops below
the head pressure setpoint by more than the deadband while
at least one compressor is operating and the entering water
temperature is less than 58°F . These conditions have to be true
for more than 5 minutes for the alarm to become active . When
the Water Regulating Valve problem occurs, the unit continues
to operate but mechanical cooling is disabled . Mechanical
cooling remains disabled until the Water Regulating Valve
problem is manually cleared through the unit keypad or via a
network signal .
Low Pressure - Circuit 1, 2, 3, 4, 5, 6 - (Lo Press 1, 2,
3, 4, 5, 6: Problem)
When a unit is equipped with individual cooling circuits, the
Low Pressure Circuit 1 problem occurs when the compressor
on circuit #1 has been running longer than the low pressure
alarm delay (65 seconds factory default for R22 or 407C
application, 5 seconds for 410A) and the low pressure switch
LP1 remains open . The alarm also occurs any time afterward
if the low pressure switch opens up while the compressor on
the circuit is running . Note: The Low Pressure Circuit 2, 3, 4, 5,
& 6 problems occur in the same manner for cooling circuits 2,
3, 4, 5, 6 . Compressor #1 (2, 3, 4, 5 or 6) remains disabled for
at least one cooling stage time period . After the cooling stage
time period expires, the alarm automatically clears and the
circuit is re-enabled . If the alarm occurs three times between
2:00 a .m . of one day and 2:00 a .m . of the next, the alarm does
not automatically clear the third time but must be manually
cleared through the unit keypad or via a network signal .
82
a
larMs
www .DaikinApplied .com