34 TGZ 040A through TGZ 190A OMM TGZ-1
Alarm Log
An alarm log stores the last 25 alarms and/or events to occur. When an alarm or event
occurs, it is put into the first slot in the alarm log and all others are moved down one,
dropping the last entry. In the alarm log, the date and time the alarm occurred are stored, as
well as a list of other parameters. These parameters include compressor states, evaporator
pressure, condenser pressure, number of fans on, OAT, and evaporator LWT.
Active Alarms
When an alarm occurs, it appears in the active alarm list. The active alarm list holds a
record of all active alarms, which includes the date and time each occurred.
Clearing Alarms
A password is NOT required to clear an active alarm. Active alarms must be cleared at the
unit controller. To clear active alarms scroll down to the end of the Active Alarm list press
Enter to clear all active alarms. If the user attempts to clear an alarm while the alarm
condition still exists, a new alarm will be generated immediately.
Limit Events
The following events do not cause a rapid stop but limit operation of the chiller in some
way as described in the Action Taken. All limit events do NOT appear in the Active Alarm
window and are NOT logged in the Alarm Log
Low Evaporator Pressure - Hold
Event description (as shown on screen): Evap Press Low HoldN
Trigger:
This event is triggered if all of the following are true:
• circuit state = Run
• circuit is not currently in a low OAT start
• there has been at least 30 seconds since a compressor has started on the circuit.
• evaporator pressure <= Low Evaporator Pressure - Hold set point
Action Taken: Inhibit staging on of additional compressors on the circuit.
Reset: While still running, the event will be reset if evaporator pressure > (Low Evaporator
Pressure - Hold set point is 8 psi for TGZ The event is also reset if the circuit state is no
longer run.
Low Evaporator Pressure - Unload
Event description (as shown on screen): EvapPressLow Unload N
Trigger:
This event is triggered if all of the following are true:
• circuit state = Run
• more than one compressor is running on the circuit
• circuit is not currently in a low OAT start
• there has been at least 30 seconds since a compressor has started on the circuit.
• evaporator pressure <= Low Evaporator Pressure - Unload set point for a time
greater than half of the current freezestat time
Action Taken: Stage off one compressor on the circuit every 10 seconds, except the last
one.
Reset: While still running, the event will be reset if evaporator pressure > (Low Evaporator
Pressure - Hold set point + 8psi for R134a/R22/R407C or 13 psi for R410A). The event is
also reset if the circuit state is no longer run.
To Next Page
Loading...
Need help?
General