Carrier 69NT40-541-306, Операция и обслуживание

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T-354 7–34
7. Press the UP or DOWN ARROW key to scroll through the list to obtain the proper model dash number. (If a
defective card is being used, the display will blink the message “bAd CArd." Turn start-stop switch OFF and
remove the card.)
8. Press the ENTER key on the keypad.
9. When the software loading has successfully completed, the display will show the message "EEPrM donE."
(If a problem occurs while loading the soft ware, the display will blink the message "Pro FAIL" or "bad 12V."
Turn start-stop switch OFF and remove the card.)
10. Turn unit OFF using start-stop switch (ST).
11. Remove the programming card from the program ming/software port and return the unit to normal operation
by placing the start-stop switch in the ON position.
12. Confirm correct model configuration using the key pad to choose code select 20 (CD20). The model dis-
played should match the unit serial number plate.
7.22.4 Removing and Installing the Controller
Removal:
1. Disconnect all front wire harness connectors and move wiring out of way.
2. The lower controller mounting is slotted. Loosen the top mounting screw (see Figure 7.27 ) and lift up and out.
3. Disconnect the two back connectors (EC) and re move module.
4. When removing the replacement controller from its packaging, note how it is packaged. When returning the
old controller for service, place it in the packaging in the same manner as the replacement. The pack aging
has been designed to protect the controller from both physical and electrostatic discharge dam age during
storage and transit.
Installation:
1. Install the module by reversing the removal steps.
2. Torque values for mounting screws (item 2, see Figure 7.27 ) are 0.23mkg (20 inch-pounds). Torque value
for the connectors is 0.12mkg (10 inch-pounds).
7.22.5 Battery Replacement
If required, use tool 07-00418-00.
7.23 TEMPERATURE SENSOR SERVICE
Procedures for service of the Return Recorder, Return Temperature, Supply Recorder, Supply Temperature, Ambi-
ent, Defrost Temperature, Compressor Discharge and Compressor Suction temperature sensors are provided in
the following sub paragraphs.
7.23.1 Sensor Checkout Procedure
To check a sensor reading, do the following:
1. Remove the sensor and place in a 0

C (32

F) ice-water bath. The ice-water bath is prepared by filling an
insulated container (of sufficient size to completely immerse bulb) with ice cubes or chipped ice, then filling
voids between ice with water and agitating until mixture reaches 0

C (32

F) measured on a laboratory ther-
mometer.
2. Start unit and check sensor reading on the control panel. The reading should be 0

C (32

F). If the reading is
correct, reinstall sensor; if it is not, continue with the following:
3. Turn unit OFF and disconnect power supply.
4. Refer to paragraph 6.51 and remove controller to gain access to the sensor plugs.
5. Using the plug connector marked "EC," that is connected to the back of the controller, locate the sensor
wires (RRS, RTS, SRS, STS, AMBS, DTS, CPDS OR CPSS as required). Follow those wires to the connec-
tor and using the pins of the plug, measure the resistance. Values are provided in
Table 7–1 .