MP-3000 Controller
116
22 Capacity Test 1 Error
(Check Alarm)
• Occurs during pre-trip (PTI) test only.
• Difference between supply and return air
temperature is too small with low speed evaporator
fans (less than approximately 4.5 C [8 F]).
• When the return air temperature does not reach
-18 C (0 F) within preset time.
• Indicates:
• Incorrect location of supply or return air sensor
• Air leakage at supply sensor cable
• Defective supply or return air sensor
• Interchanged sensor connections
• Incorrect evaporator fan rotation or high speed
operation
• Incorrect refrigeration system operation
• Container/side panels defective, damaged or
leaking
• Enter Manual Function Test and start
evaporator fans on low speed. Then select
Sensor Checks test and operate fans 2 to 5
minutes. Check supply, return and evaporator
coil (defrost) sensor temperatures. Sensor
readings should be the same (evaporator coil
may be 0.5 C [1.0 F] lower due to fan motor
heat).
NOTE: This sensor check does not detect
air leakage around the sensor cables.
• Open evaporator door and inspect evaporator
fan rotation. Make sure fans are rotating
correctly on low speed.
• Check the sensor connections.
• Enter Manual Function Test menu. Start and
check current draw of the following
components separately and together:
compressor, compressor 100%, condenser
fan and evaporator fans (low). Check
discharge and suction pressure readings. Also
check the refrigerant charge.
NOTE: This alarm can be activated in
ambient temperatures below -10 C (14 F),
even under normal conditions.
23 Capacity Test 2 Error
(Check Alarm)
• Occurs during pre-trip (PTI) test only.
• Difference between supply and return air
temperature is too small with high speed
evaporator fans (less than approximately 3.0 C
(5.4 F); or temperature difference is less than in
test P1.15.
• When the return air temperature does not reach
0 C (32 F) within preset time.
• Indicates:
• Incorrect location of supply or return air sensor
• Air leakage at supply, return or defrost
(evaporator coil) sensor cable
• Defective supply or return air sensor
• Interchanged sensor connections
• Incorrect evaporator fan rotation or low speed
operation
• Incorrect refrigeration system operation
• Container/side panels defective, damaged or
leaking
• Enter Manual Function Test and start
evaporator fans on high speed. Then select
Sensor Checks test and operate fans 2 to 5
minutes. Check supply, return and evaporator
coil (defrost) sensor temperatures. Sensor
readings should be the same (evaporator coil
may be 0.5 C [1.0 F] lower due to fan motor
heat).
NOTE: This sensor check does not detect
air leakage around the sensor cables.
• Open evaporator door and inspect evaporator
fan rotation. Make sure fans are rotating
correctly on high speed.
• Check the sensor connections.
• Enter Manual Function Test menu. Start and
check current draw of the following
components separately and together:
compressor, compressor 100%, condenser
fan and evaporator fans (high). Check
discharge and suction pressure readings. Also
check the refrigerant charge.
NOTE: Alarm can be activated in ambient
temperatures below -10 C (14 F), even
under normal conditions.
Alarm Codes, Descriptions and Corrective Actions (Continued)
Code Description Corrective Action
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