6--23
T-334
CAUTION
Do not allow moisture to enter wire splice
area as this may affect the sensor resis-
tance.
m.Position sensor in unit as shown in Figure 6--22 and
re-check sensor resistance.
n. Reinstall sensor, refer to paragraph 6.22.3.
NOTE
The P5 Pre-Trip test must be run to inactivate
probe alarms (refer to paragraph 4.8).
6.22.3 Sensor Re-Installation
a. Sensors STS and SRS
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 6--22).
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.
2
3
6 mm
(1/4 inch)
1
4
5
6
1. Sensor Wires
2. Cap and Grommet
Assembly
3. Evaporator Back
Panel
4. Supply Air Stream
5. Supply Sensor
6. Probe Holder
Figure 6--22 Supply Sensor Positioning
b. Sensors RRS and RTS
Reinstall the return sensor as shown in Figure 6--23. 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
3
4
2
1. Evaporator Grille
2. Return Sensor
3. Mounting Cap
4. Enlarged Positioning
(Plastic) Section
Figure 6--23 Return Sensor Positioning
c. Sensor DTS
The DTS sensor must have insulating material placed
completely over the sensor to insure the coil metal
temperature is sensed.
6.23 ELECTRONIC PARTLOW TEMPERATURE
RECORDER
The microprocessor based temperature recorder is
designed to interface with the DataCORDER to log
temperature with time. The electronic recorder will
automatically record the return air, supply air, or both,
based on the setting of temperature controller
configuration code CnF37, refer to Table 3--4. The
recorder reads and records data from the Controller in
present time, under normal operating conditions.
If the power has been OFF for more than thirty days, the
recorder will NOT re-synchronize (the chart will not
advance to present time), the pen tip will move to the
currently recorded temperature, and the recorder will
resume normal temperature recording.
If using the Electronic Partlow Recorder CTD part
number 12-00464-xx
Where xx= an even number (example: 12-00464-08)
The recorder will STOP when the power is OFF, and the
pen tip will remain at the last recorded temperature on
the chart. When power is applied, and the power off
period is less than thirty days; the recorder will retrieve
the logged data from the DataCORDER for the power
off period and record it onto the chart, thereafter, the
recorder will resume normal temperature recording.
If the optional DataCORDER battery pack is being used,
and the charge is too low to enable recording during the
power off period of less than thirty days, the pen tip will
move to below the inner chart ring for the period when
NO data was recorded by the DataCORDER.
If the power has been OFF for more than thirty days, the
recorder will NOT re-synchronize (the chart will not
advance to present time), the pen tip will move to the
currently recorded temperature, and the recorder will
resume normal temperature recording.
6.23.1 Replacing the Recorder
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