OMM 1130 25
Dynamic Defaults
Some set points will have a particular default value loaded when another setting is changed.
Refrigerant Dependent Defaults
Refrigerant Type
Set Point
R134a
R22 R407C R410A
Low Evaporator Pressure Hold 29 psi 59 psi 60 psi 101 psi
Low Evaporator Pressure Unload
28 psi
58 psi 59 psi 100 psi
High Condenser Pressure Unload 170 psi
370 psi AC
265 psi WC
370 psi AC
265 psi WC
550 psi AC
405 psi WC
High Condenser Pressure 185 psi
380 psi AC
280 psi WC
380 psi AC
280 psi WC
565 psi AC
420 psi WC
AC = Air Cooled, WC = Water Cooled (R134a is water cooled ONLY)
Number of Fans Dependent Defaults
When the number of fans setting is changed, the forced fan set points will default to values as shown in
the following table:
Number of Fans Set Point
Set Point
4 6 8 10
Forced Fan 1 (>75°F) 1 1 1 1
Forced Fan 2 (>90°F) 1 1 2 2
Forced Fan 3 (>105°F) 2 2 3 3
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 (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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