MP-3000 Controller
104
7. The controller then checks the new software
and loads the new control program into
memory.
NOTE: If the flash load procedure is
interrupted or fails, the controller will
continue to use the previous control
program.
NOTE: Installing new software does not
change any configuration settings or the
setpoint setting, or erase the data log
currently stored in the controller.
Temperature Sensors
Thermistor type temperature sensors are used.
Each sensor is connected to a shielded cable and
placed in a sealed stainless steel tube. The
temperature signal from the sensor is transmitted
through the shielded cable. Temperature sensors
include:
• Supply Air, Left Hand
• Supply Air, Right Hand
• Return Air
• Evaporator Coil
• Condenser Coil
• Compressor Discharge Manifold
• Ambient Air
All sensors should be properly installed:
• Supply air sensors must be inserted to the
bottom of the sensor tube and completely
sealed by the grommet connection.
• Left hand supply sensor installs in the sensor
tube behind the compressor.
• Right hand supply sensor installed in the
sensor tube next to the control box.
• Return air sensor installs in a grommet
between the evaporator fans.
A. Coil Support Brackets
B. Unit Front
C.
Insert Sensor at least 75 mm into coil
between Tube Rows 2 and 3.
Figure 33: CSR20SL and CSR40SL Evaporator Coil
(Defrost) Sensor Location
AXA0171
A. Coil Support Bracket
B. Unit Front
C.
Insert Sensor at least 75 mm into coil
between Tube Rows 2 and 3.
Figure 34: CSR40 Evaporator Coil (Defrost) Sensor
Location
CAUTION: Sensors are permanently
calibrated and can be checked using an
ohmmeter. Ohm readings should agree
with the data shown in the Sensor
resistance tables on 105.
AXA0172
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