Carrier 69NT40-561-300, Operation And Service Manual

Page: 154 / 174

T-365 7–38
CAUTION
!
Do not allow moisture to enter wire splice area as this may affect sensor resistance.
12.Slide large heat shrink tubing over both splices and shrink.
13.Position sensor in unit as shown in Figure 7.23 and re-check sensor resistance:
Figure 7.25 - Return Sensor Positioning
Figure 7.24 - Supply Sensor Positioning
Figure 7.26 - ETS Sensor Positioning
14.Reinstall sensor, refer to:
Section 7.25.3 - STS and SRS Re-Installation
Section 7.25.4 - RRS and RTS Re-Installation
Section 7.25.5 - DTS Re-Installation
Section 7.25.6 - ETS1 and ETS2 Re-Installation
NOTICE
The P5 Pre-Trip test must be run to deactivate probe alarms (refer to Section 5.8 ).
7.25.3 Sensors STS and SRS Re-Installation
To properly position a unit supply sensor (Supply Temperature Sensor STS or Supply Recorder Sensor SRS),
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 back panel. The design minimum clearance of
6 mm (1/4 inch) should be maintained (see
Figure 7.24 ).
Figure 7.24 Supply Sensor Positioning
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