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INTER 2V4SA
4.4.
Temperature Probes
The controller is supplied with one tempera-
ture probe connected to input #1. Up to three
additional probes can be connected to the
controller in order to obtain a more accurate
reading of the average room temperature and
a faster reaction time.
I. Connecting the Probes
• Connect additional probes to
inputs # 2, 3 and 4 as shown on
the wiring diagram and then use
dipswitches 3-5 to enable the
proper inputs:
#
OFF
3
Probe 2 disabled
4
Probe 3 disabled
5
Probe 4 disabled
II. Extending the Probes
Probes operate at low voltage and are
isolated from the 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.
Extending a probe: Each probe can be ex-
tended up to 500 feet (150 meters).
To extend a probe: Use a shielded cable of
outside diameter between 0.245 and 0.260
in (6.22 and 6.60 mm) (the cable dimensions
should not be under 18 AWG) to ensure the
cable entry is liquid tight. Do not ground
the shielding.
It is preferable to solder the cable joint to
ensure a proper contact between the two
cables.
ON
OFF
ON
Probe 2 enabled
Probe 3 enabled
Probe 4 enabled
Do not run probe cables next to other
power cables. When crossing over other
cables, cross at 90°.
III. Defective Probes
If a defective probe is detected, the Defective
Probe Pilot Light turns on. The room tempera-
ture shown on the display corresponds to the
average temperature measured by the probes
in working condition.
To identify the defective probe:
• Select the PROBE TEMP / MIN / MAX menu.
If the probe connected to input # 1 is not
defective, the letters "PR1" are displayed,
alternating with the on/off state of the probe
and the temperature measured by the probe.
If the probe is defective, the letters "PR1" are
displayed, alternating with the state of the
probe and the letter "P".
• Press the Other Functions button to step
to the following probe.
• Proceed as explained above to make sure
all probes are in working order.
INTER 2V4SA, rev.02
9
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