Carrier 69NT40-541-505, Operation And Service Manual, Page: 115 / 143

7–23 T-368
7.20.5 Battery Replacement
Standard Battery Location (Standard Cells):
a. Turn unit power OFF and disconnect power supply.
b. Slide bracket out and remove old batteries. (See
Figure 4.4 , Item 8.)
c. Install new batteries and slide bracket into con-
trol box slot.
CAUTION
!
Use care when cutting wire ties to avoid
nicking or cutting wires.
Standard Battery Location (Rechargeable Cells):
a. Turn unit power OFF and disconnect power supply.
b. Disconnect battery wire connector from control
box.
c. Slide out and remove old battery and bracket. (See
Figure 4.4 , Item 8.)
d. Slide new battery pack and bracket into the control
box slot.
e. Reconnect battery wire connector to control box
and replace wire ties that were removed.
Secure Battery Option (Rechargeable Cells Only):
a. Turn unit power OFF and disconnect power supply.
b. Open control box door and remove both the
high voltage shield and clear plastic rain shield
(if installed).
c. Disconnect the battery wires from the “KA” plug
positions 14, 13, 11.
d. Using Driver Bit, Carrier Transicold part number
07 − 00418 − 00, remove the 4 screws securing the
display module to the control box. Disconnect the
ribbon cable and set the display module aside.
NOTE
The battery wires must face toward the right.
e. Remove the old battery from the bracket and
clean bracket surface. Remove the protective
backing from the new battery and assemble to
the bracket. Secure battery by inserting the wire
tie from the back of the bracket around the bat-
tery, and back through the bracket.
f. Reconnect the ribbon cable to display and
re − install the display.
g. Route the battery wires from the battery along
the display harness and connect the red battery
wire and one end of the red jumper to “KA14,”
the other end of the red jumper wire to “KA11,”
and the black wire to “KA13.”
h. Replace wire ties that were removed.
7.21 TEMPERATURE SENSOR SERVICE
Service procedures for service of the return recorder,
return temperature, supply recorder, supply tempera-
ture, ambient, defrost temperature, compressor dis-
charge and compressor suction temperature sensors
are provided in the following sub paragraphs.
7.21.1 Sensor Checkout Procedure
To verify that accuracy of a temperature sensor:
a. Remove the sensor from the bracket 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 mix-
ture reaches 0°C (32°F) measured on a labora-
tory thermometer.
b. Start unit and check sensor reading on the con-
trol panel. The reading should be 0C (32F). If
the reading is correct, reinstall sensor; if it is not,
continue with the following:
c. Turn unit OFF and disconnect power supply.
d. Refer to Section 7.20 and remove controller to
gain access to the sensor plugs.
e. 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 connector and using the pins
of the plug, measure the resistance. Values are
provided in Table 7-2.
Table 7–2 Sensor Temperature/Resistance Chart
Temperature
Centigrade
Temperature
Fahrenheit
Resistance
(Ohms)
RRS, RTS, SRS and STS
0 32 32,650 +/ − 91
25 77 10,000 +/ − 50
AMBS and DTS
0 32
32,650 +1720
-1620
25 77
10,000 +450
-430
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