OM 200MICRO 45
Faults
The chiller will be shut down by the MicroTech control panel in response to any of the following fault
conditions. These faults must be cleared manually to restart the unit.
FAULT CONDITION DISPLAY
Low Evaporator Pressure Evaporator Pressure is less than low limit (26 psig) Lo Evap Pressure-SD
Low Oil Delta Pressure
Oil Pump output has been energized for more then
30 seconds and Oil Feed Pressure is less than the
Evaporator Refrigerant Pressure by more than the
alarm set point (30 psi)
Lo Evap Pressure-SD
Low Oil Feed Temperature
Oil Feed temperature is less than Evaporator
Refrigerant Temperature plus Low Oil delta Spt
(30°F) for greater than 1 minute (adjustable)
Low Oil Feed Temp
High Oil Feed Temperature
Oil Feed temperature is greater than high limit
(140°F) for greater than 1 minute (adjustment)
High Oil Feed Temp
Low Motor Current
MCR has been energized for more than 30 seconds
and Motor Current is less than low limit (10%)
Low Motor Current
High Motor Current
MCR has been de-energized for more than 30
seconds and Motor Current is greater than shutdown
limit (10%)
High Motor Current
High Discharge Line Temperature Discharge Temperature is > Set Point (190°F) Hi Disch Line Temp
High Condenser Pressure
Condenser Pressure is greater than high limit (140
psi) or High Cond Pressure digital input in Alarm
position
Hi Condenser Press
Mechanical High Pressure Switch High Pressure digital input in Alarm position Mech Hi Pres Switch
High Motor Temperature
Motor High Temperature digital input in Alarm
position
High Motor Temp
High Suction Superheat Suction Superheat temperature > Set Point (50°F) Hi Suction Superht
No Starter Transition
MCR has been turned on more than 15 seconds
and Starter Transition digital input is not in Delta
position
No Starter Transition
No Evaporator Water Flow Fault
UnitStatus > EvapPmpOn_Recirc and UnitStatus <
EvapPmpsOff_Shutdn and Evaporator Water Flow
switch digital input in No Flow position for more than
3 second (adjustable)
No Evap Water Flow
No Condenser Water Flow Fault
UnitStatus > CondPmpOn_WaitingForFlow and
UnitStatus < CondPmpsOff_Shutdn and Condenser
Water Flow switch digital input in No Flow position
for more than 3 seconds (adjustable)
No Cond Water Flow
Starter Fault
MCR Output energized and Starter Fault digital input
in Alarm position
Starter Fault
No 5Vdc at sensor #19 Analog sensor #19 value is < 213 or > 252 counts No 5Vdc at Sen #19
Leaving Evaporator Water Temperarture
Sensor Fail
Sensor is shorted or open Lvg Evap T Sen Fail
Evaporator Pressure Sensor Fail Sensor is shorted or open Evap Press Sen Fail
Entering Condenser Water Temperature
Sensor Fail
Sensor is shorted or open Ent Cond T Sen Fail
Suction Temperature Sensor Fail Warning Sensor is shorted or open Suction T Sen Fail
Discharge Temperature Sensor Fail Sensor is shorted or open Discharg T Sen Fail
Condenser Pressure Sensor Fail Sensor is shorted or open Cond Press Sen Fail
Oil Feed Temperature Sensor Fail Sensor is shorted or open Oil Feed T Sen Fail
Oil Sump Temperature Sensor Fail Sensor is shorted or open Oil Sump T Sen Fail
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