30 TGZ 040A through TGZ 190A OMM TGZ-1
Table 17, Dynamic Defaults (Refrigerant Dependent)
Some set points will have a particular default value loaded when another setting is changed.
Defaults
Refrigerant Type
Set Point
R134a
Low Evaporator Pressure Hold 29 psi
Low Evaporator Pressure Unload
28 psi
High Condenser Pressure Unload 170 psi
High Condenser Pressure 185 psi
Events & Alarms
Protection (Shutdown) Alarms
Equipment protection alarms trigger a rapid compressor shutdown. The following section
identifies each equipment protection alarm, gives the trigger that causes the alarm to occur,
states the action taken because of the alarm and reset method. Most equipment protection
alarms require a manual reset. These alarms will energize a remote alarm if the unit is so
wired in the field.
Alarms and Events
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 will be turned ON when any stop alarm occurs. They will
be turned off when all alarms have been cleared.
Evaporator Flow Loss
Alarm description (as shown on screen): 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:
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