Unit Controller
www.DaikinApplied.com 35
IOM 1322-1 • WATER-COOLED SCROLL COMPRESSOR
Automatic Adjusted Limits
The following are set points that will be limited based on the
option selected.
Evaporator Leaving Water Temperature
Mode
Refrigerant
Type
Range
Unit Mode = Cool
R410A
40 to 60°F
Unit Mode = Cool w/Glycol
R410A
15 to 60°F
Unit Mode = Ice
R410A
20 to 40°F
Evaporator Freeze Temperature
Mode
Refrigerant
Type
Range
Unit Mode = Cool
R410A
36 to 42°F
Unit Mode = Cool w/Glycol,
Ice w/Glycol
R410A
12.5 to 42°F
Ice Leaving Water Temperature
Refrigerant Type
Range
R410A
15 to 40°F
Low Evaporator Pressure Inhibit Loading and Unloading
Mode
Refrigerant Type
Range
Unit Mode = Cool
R410A
97 to 115 psi
Unit Mode = Cool w/
Glycol, Ice w/Glycol
R410A
48 to 115 psi
Dynamic Defaults
Some set points will have a particular default value loaded
when another setting is changed.
Refrigerant Dependent Defaults
NOTE:
The backup mechanical high pressure cutout is set at
450 psi for water cooled applications.
Events & Alarms
Situations may arise that require some action from the chiller
or that should be logged for future reference. Conditions that
cause a shutdown and require manual reset is known as a stop
alarm. Other conditions can trigger what is known as an event,
which may or may not require action in response. All stop
alarms and events are logged.
Unit Stop Alarms
The alarm output and red button is turned ON when any
stop alarm occurs and turned off when all alarms have been
cleared.
Evaporator Flow Loss
Alarm description
: Evaporator Flow Loss
Trigger
:
1. Evaporator Pump State = Run AND Evaporator Flow
Digital Input = No Flow for time > Evap Flow Proof Set
Point AND at least one compressor running.
2. Evaporator Pump State = Start for time greater than
Recirc Timeout Set Point AND all pumps have been tried
AND Evaporator Flow Digital Input = No Flow.
Action Taken:
Rapid stop all circuits.
Reset:
This alarm can be cleared at any time manually via the
keypad or via the BAS clear alarm signal.
If active via trigger condition 1:
When the alarm occurs due to this trigger, it can auto reset
the first two times each day, with the third occurrence being
manual reset.
For the auto-reset occurrences, the alarm will reset
automatically when the evaporator state is Run again. This
means the alarm stays active while the unit waits for flow, then
it goes through the recirculation process after flow is detected.
Once the recirculation is complete, the evaporator goes to the
Run state which will clear the alarm. After three occurrences,
the count of occurrences is reset and the cycle starts over if the
manual reset flow loss alarm is cleared.
If active via trigger condition 2:
If the flow loss alarm has occurred due to this trigger, it is
always a manual reset alarm.
Condenser Flow Loss
Alarm description:
Condenser Flow Loss
Trigger
:
1. Condenser Pump State = Run AND Condenser Flow
Digital Input = No Flow for time > Cond Flow Proof Set
Point AND at least one compressor running.
2. Condenser Pump State = Start for time greater than
Recirc Timeout Set Point AND all pumps have been tried
AND Condenser Flow Digital Input = No Flow.
Action Taken:
Rapid stop all circuits.
Summary of Contents for WGZ030DW
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