Carrier 69NT40-541-001, Operation And Service

Page: 122 / 156

T-316 7–34
Figure 7.26 Sensor and Cable Splice
7.21.3 Sensor Re-Installation
a. Sensors STS/SRS
To properly position a supply sensor, the sensor must be fully inserted into the probe holder. This positioning will
give the sensor the optimum amount of exposure to the supply 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 6 mm (1/4 inch) should be maintained (see
Figure 7.27 ).
b. Sensor RTS/RRS
Reinstall the return sensor as shown in Figure 7.28 . For proper placement of the return sensor, be sure to position
the seal section of the sensor against the side of the mounting clamp.
c. Sensor DTS
The DTS sensor must have insulating material placed completely over the sensor to insure the coil metal tempera-
ture is sensed.
Figure 7.27 Supply Sensor Positioning Figure 7.28 Return Sensor Positioning
Sensor
Cables
Heat Shrink Tubing
Large Heat Shrink Tubing
REPLACEMENT 2--WIRE TO 2--WIRE OR 3--WIRE TO 3--WIRE
REPLACEMENT FOR DUAL, SINGLE SENSOR CONFIGURATION
RED
BLACK
RED/WHITE
Cable
Sensor
Cap and Grommet
Assembly
Probe
Holder
Return Sensor
Sensor
Wires
Return
Air
Stream
Evaporator
Back Panel
6mm
(1/4--inch)
Evaporator Grille
Combination
Sensor (Mount in
Either Clamp)
Mounting
Clamp
Seal