Code +030220215- rel. 1.4 – 25.04.2007-
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4. Installing the probes
4.1 Suction temperature probe
The temperature probe must be selected based on the application.
Showcases/cold rooms
: NTC***HF** (with clamp) or NTC***HP**.
Air-conditioners/chillers
: NTC***WF** preferably in a socket, or NTC***HF** or NTC***HP**.
The position of this probe is extremely important, as it determines the accuracy of the superheat value and the
speed of response to variations in this.
The probe should be installed after the evaporator outlet, in a straight and horizontal section. Comparing the
section of pipe to the face of a clock, the probe must be positioned at 12 o’clock for pipes with a diameter less than
22 mm, and at 4.30 or 7.30 for pipes with a diameter greater than or equal to 22 mm.
All precautions must be taken to maximise the thermal coupling between the pipe and probe, spreading conductive
paste on the point of contact between the probe and the pipe, fastening the probe with a clamp (included with the
NTC***HF**).
The probe cable must be looped in the immediate vicinity of the probe and then secured by elastic band; this will
prevent significant variations in temperature (such as those that occur during the defrost cycles) that may damage
the cable connection to the probe.
Finally, the pipe-probe assembly should first be covered with aluminium tape, and then with insulating material.
No types of adhesive should be used, to avoid ruining the plastic material used to make the probe or the
cable.
Fig. 4.a
Fig. 4.b
Fig. 4.c
Fig. 4.d
Fig. 4.e
Fig. 4.f
NTC**HF**
NTC**HP**
installation
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