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STEP 3 - TEMPERATURE PROBES
Extending the Probes
Each probe can be extended up to 500 feet (150 m):
Use a shielded cable of outside diameter between 0.245 and
0.260 in (6.22 and 6.60 mm) to ensure the cable entry is liquid tight (cable
dimensions should not be under 18 AWG). Do not ground the shielding.
It is preferable to solder the cable joint to ensure a proper contact
between the two cables.
CAUTION
: Do not run probe cables next to other power cables. When
crossing over other cables, cross at 90
Connecting the Probes
The controller is supplied with two temperature probes connected to
terminals # 1 and 2. Probe 2 can be deactivated by setting internal switch
# 3 to OFF.
CAUTION:
supply. Be sure that probe cables remain insulated from all high voltage
sources. In particular, do not route the probe cables through the same
electrical knockout as other cables. Do not connect the shield from the probe
cable to a terminal or a ground.
Detecting Faulty Probes
If a faulty probe is detected, the Defective Probe pilot light turns on. The
room temperature shown on the display is then the average temperature
measured by the probes in working condition. The controller will operate
according to this temperature. If all the probes are defective, the display
shows "P".
Probes operate at low voltage and are insulated from the
TC4-NVS/P
o
.
TC4-NVS/P.rev.05
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