6
−
21
T-364
6.22.3 Sensors STS and SRS Re-Installation
To properly position a unit supply sensor (Supply Tem-
perature 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 al-
low the Controller to operate correctly. Insufficient probe
insertion into the probe holder will result in poor temper-
ature 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
Cap and Grommet
Assembly
Probe
Holder
Supply Sensor
Sensor
Wires
Supply
Air
Stream
Evaporator
Back Panel
6 mm
(1/4 inch)
Figure 6
−
16 Supply Sensor Positioning
6.22.4 Sensors RRS and RTS Re-Installation
Reinstall the return sensor (Return Temperature Sensor
RTS or Return Recorder Sensor RRS), as shown in
17. For proper placement of the return sensor,
be sure to position the enlarged positioning section of
the sensor against the the side of the mounting clamp.
1.50 in.
(38.1cm)
Mounting
Clamp
Return
Sensor
Figure 6
−
17 Return Sensor Positioning
6.22.5 Sensor DTS Re-Installation
The Defrost Temperature Sensor (DTS) must have in-
sulating material placed completely over the sensor to
ensure the coil metal temperature is sensed.
6.22.6 Sensors ETS1 and ETS2 Re-Installation
The Evaporator Temperature Sensors, ETS1 and ETS2
are located in a tube holder under insulation, as illus-
trated in Figure 6
18. When the combo sensor is re-
moved 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 tem-
perature is sensed.
1.00 in.
(25.4cm)
1. Wire Tie
2. ETS1 and ETS 2
3. ETS Tube Holder
4. Insulation
Figure 6
−
18 Evaporator Temperature Sensor
Positioning
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