12
ST 5220
QM 1336.rev.01
1
Connecting the Probes
The controller is supplied with one room probe connected to input # 1. Three
additional probes can be connected to inputs # 2, 3 and 4 (see wiring diagram
enclosed).
CAUTION
:
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 an input or a ground.
2
Extending the Probes
Each probe can be extended up to 500 feet (150 meters). To extend a probe:
n
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.
n
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°.
T
EMPERATURE PROBES
