Carrier 69NT40-541-306, Operation And Service

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T-354 7–36
Figure 7.29 Sensor Types
5. Strip back insulation on all wiring 6.3mm (1/4-inch).
6. Slide a large piece of heat shrink tubing over the cable, and place small pieces of heat shrink tubing, one
over each wire, before adding crimp fittings as shown in Figure 7.28 .
7. If required, slide the cap and grommet assembly onto the replacement sensor. If the replacement sensor is
of a larger diameter than the original, a different grommet may be required.
8. Slip crimp fittings over dressed wires (keeping wire colors together). Make sure wires are pushed into crimp
fittings as far as possible and crimp with crimping tool.
9. Solder spliced wires with a 60% tin and 40% lead Rosincore solder.
10. Slide heat shrink tubing over splice so that ends of tubing cover both ends of crimp as shown in Figure 7.28 .
11. Heat tubing to shrink over splice. Make sure all seams are sealed tightly against the wiring to prevent mois-
ture seepage.
12. Slide large heat shrink tubing over both splices and shrink.
CAUTION
!
Do not allow moisture to enter wire splice area as this may affect the sensor resistance.
13. Reinstall sensor, refer to Section 7.23.3 .
NOTE
The P5 Pre-Trip test must be run to inactivate probe alarms (refer to Section 5.8 ).
7.23.3 Sensor Re-Installation
Sensors RTS/RRS
To properly position a return sensor, the sensor must be fully inserted into the probe holder. This positioning will
give the sensor the optimum amount of exposure to the return air stream, and will allow the Controller to operate
correctly. Insufficient probe insertion into the probe holder will result in poor temperature control due to the lack of
air flow over the sensor.
It is also necessary to ensure that the probe tip does not contact the evaporator back panel. The design minimum
clearance of 6mm (1/4-inch) should be maintained (see
Figure 7.30 .
Sensor
40mm (1--1/2 inch)
6.3mm (1/4--inch)
Mounting Stud Type
Sensor
40 mm (1-1/2 inches)
6.3--mm (1/4--inch)
Bulb Type