MP-3000a Controller
99
6. Flash loading of new software is complete
when “FLASH LOADING” clears from the
LCD display.
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 setpoint setting, or
erase 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 Temperature
•
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 installs in the sensor
tube next to the control box.
•
Return air sensor installs in a grommet
between the evaporator fans.
CAUTION: Sensors are permanently
calibrated and can be checked using an
ohmmeter. Ohm readings should agree
with data shown in Sensor Resistance
Tables.
Resistance Values for Supply, Return,
Evaporator Coil, Condenser Coil and Ambient
Air Sensors
Temp.
°F
Temp
. °C
OHMS
Temp.
°F
Temp.
°C
OHM
S
-40
-40
42618
53.6
12
3360
-31
-35
32198
57.2
14
3094
-22
-30
24532
60.8
16
2852
-13
-25
18850
64.4
18
2632
-4
-20
14618
68
20
2431
5
-15
11383
71.6
22
2347
10.4
-12
9838
75.2
24
2079
14
-10
8941
78.8
26
1925
17.6
-8
8132
82.4
28
1785
21.2
-6
7406
86
30
1657
24.8
-4
6752
89.6
32
1539
28.4
-2
6164
93.2
34
1430
32
0
5634
96.8
36
1330
35.6
2
5155
100.4
38
1239
39.2
4
4721
104
40
1154
42.8
6
4329
107.6
42
1076
46.4
8
3907
111.2
44
1004
50
10
3652
113
45
970
Summary of Contents for CRR-40 119
Page 4: ......
Page 16: ...Safety Precautions 16...
Page 18: ...Service Guide 18...
Page 20: ...Model Features 20...
Page 32: ...Specifications 32...
Page 120: ...MP 3000a Controller 120...
Page 160: ...Wiring and Schematic Diagrams Index 160...
Page 161: ...161 MPC2000 Wiring Schematic...
Page 162: ...162 MPC2000 High Voltage Wiring Diagram...
Page 163: ...163 MPC2000 Low Voltage Wiring Diagram...
Page 164: ...164 MPC2000 WCC Wiring Schematic...