Carrier 69NT40-561-019, Operation And Service Manual

Page: 117 / 136

7–31 T-359
g. If required, slide the cap and grommet assembly onto the replacement sensor.
h. 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.
i. Solder spliced wires with a 60% tin and 40% lead Rosincore solder.
j. Slide heat shrink tubing over each splice so that ends of tubing cover both ends of crimp as shown in
Figure 7.15 .
k. Heat tubing to shrink over splice. Make sure all seams are sealed tightly against the wiring to prevent mois-
ture seepage.
CAUTION
!
Do not allow moisture to enter wire splice area as this may affect the sensor resistance.
l. Slide large heat shrink tubing over both splices and shrink.
m. Position sensor in unit as shown in Figure 7.15 and re-check sensor resistance.
n. Reinstall sensor (refer to Section 7.19.3 ).
NOTE
The P5 Pre-Trip test must be run to inactivate probe alarms (refer to Section 5.7 ).
7.19.3 Sensor Re-Installation
Sensors STS and SRS
To properly position a supply sensor, the sensor must be fully inserted into the probe holder. Figure 7.16 . Do not
allow heat shrink covering to contact the probe holder. For proper placement of the sensor, be sure to position the
enlarged positioning section of the sensor against the side of the mounting clamp. This positioning will give the
sensor the optimum amount of expo sure to the supply air stream, and will allow the controller to operate correctly.
Sensors RRS and RTS
Reinstall the return sensor as shown in Figure 7.17 . For proper placement of the return sensor, be sure to position
the enlarged positioning section of the sensor against the side of the mounting clamp.
Sensor DTS
The DTS sensor must have insulating material placed completely over the sensor to ensure the coil metal tempera-
ture is sensed.
Sensors ETS1 and ETS2
The ETS1 and ETS2 sensors are located in a tube holder under insulation, as illustrated in Figure 7.18 . When the
combo sensor is removed and reinstalled, it must be placed in a tube holder by applying thermal grease. Insulating
material must completely cover the sensor to ensure the correct temperature is sensed.