Instruction manual

KOMAC00607-09EN 45
Action Taken: Action Taken: Unload the compressor by decreasing the capacity
by one step every 5 seconds until the evaporator pressure rises above the Low
Evaporator Pressure Unload set point.
Reset: While still running, the event will be reset if evaporator pressure > (Low
Evaporator Pressure Hold SP + 2psi). The event is also reset if the unit mode is
switched to Ice, or the circuit is no longer in the run state.
High Condenser Pressure - Hold
Event description (as shown on screen): CondPressHigh Hold N
Trigger: While the compressor is running and unit mode is Cool, if saturated
condenser temperature >= High Saturated Condenser Hold Value, the event is
triggered.
Action Taken: Inhibit loading.
Reset: While still running, the event will be reset if saturated condenser
temperature < (High Saturated Condenser Hold Value – 10
o
F). The event is also
reset if the unit mode is switched to Ice, or the circuit is no longer in the run state.
High Condenser Pressure - Unload
Event description (as shown on screen): CondPressHighUnloadN
Trigger: While the compressor is running and unit mode is Cool, if saturated
condenser temperature >= High Saturated Condenser Unload Value, the event is
triggered.
Action Taken: Unload the compressor by decreasing the capacity by one step
every 5 seconds until the evaporator pressure rises above the High Condensing
Pressure Unload set point.
Reset: While still running, the event will be reset if saturated condenser
temperature < (High Saturated Condenser Unload Value – 10
o
F). The event is
also reset if the unit mode is switched to Ice, or the circuit is no longer in the run
state.
Failed Pumpdown
Event description (as shown on screen): Pumpdown Fail Cir N
Trigger: Circuit state = pumpdown for time > Pumpdown Time set point
Action Taken: Shutdown circuit
Reset: N/A
Power Loss While Running
Event description (as shown on screen): Run Power Loss Cir N
Trigger: Circuit controller is powered up after losing power while compressor
was running
Action Taken: N/A
Reset: N/A
Alarm Logging
When an alarm occurs, the alarm type, date, and time are stored in the active alarm
buffer corresponding to that alarm (viewed on the Alarm Active screens) also in the
alarm history buffer (viewed on the Alarm Log screens). The active alarm buffers hold
a record of all current alarms.
A separate alarm log stores the last 25 alarms to occur. When an alarm occurs, it is put
into the first slot in the alarm log and all others are moved down one, dropping the last
alarm. In the alarm log, the date and time the alarm occurred are stored, as well as a list
of other parameters. These parameters include unit state, OAT, LWT, and EWT for all
alarms. If the alarm is a circuit alarm, then the circuit state, refrigerant pressures and
temperatures, EXV position, compressor load, number of fans on, and compressor run
time are also stored.