S&P TERMOTECH-MT Serie Instrucciones De Uso página 11

• This range includes several models, differentiated by the number of heating elements or
their power consumption. To make the installation as flexible and compatible as possible
with your requirements, all the products have an external connection box. Inside the box
there is a multipin terminal strip for connecting ground, neutral and phases cables.
• For products with 2 or 3 resistances, all the phases are at the disposal of the terminal inde-
pendently, so that it is possible:
– To design power supply circuits enabling separate activation of the heating elements one
by one, enabling reduction of total energy consumption when less heating is needed.
– Connect the product to a three-phase electricity supply, distributing the loads between
the different phases to balance the system in an optimum manner.
• For correct installation and connection to the mains, it is necessary to:
1. Opt for a single-phase or three-phase connection, according to the diagrams indicated
in table TAB 2 and then determine the amount of conductors needed.
2. Respect the minimum section of conductors.
3. You can choose a connection via a power cable or via a tube (rigid or flexible) and
choose the device to hold the cables or an adequate connection joint (Minimum degree
of protection: IP54).
4. Open the connection box (Fig. 3/a) to perforate it in the predefined point (Fig. 3/b) and
secure the device for holding the cables or connection joint (Fig. 3/c-d). The diameter
of the orifice to be made in the connection box will vary according to the device used
for holding the cable gland seal chosen and it must be made at the top of the box, cor-
responding to the predetermined point.
5. Make the necessary electrical connections (Fig. 3/e-f), stripping the cables no more than
8 mm, so as not to run the risk of them coming into contact with other cables. Do not
screw the terminal to the insulation.
6. Tighten the cable-holding device or connection joint adequately (Fig. 3/g).
7. Close the connection box with the screws supplied (Fig. 3/h).
• If you have chosen to use a power cable, you should:
– Select one of the H05RN-F or FROR 450/750V type.
– Identify the most adequate cable gland according to cable diameter, using table TAB 3.
– Ensure that the cable, when connected, cannot come into contact with any metal parts of
the product.
Example:
You have purchased the TERMOTECH HT-5250 and wish to use a power cable for a three-
phase connection. Hence, you'll have to:
1. Identify the necessary number of conductors: you choose connection type "E" (three-
phase), so you'll get 5 conductors for earth, neutral, L1, L2 and L3.
2. Verify the minimum section diameter of the conductors as indicated in TAB 2: 2,5 mm
in this case.
3. Choose which type of wire you wish to use: type FROR 450/750V 5G2,5 (yellow/green
connector for earth) is necessary for the required needs.
4. Verify the exterior diameter of the wire by measuring or contacting the supplier: section
of the wire in this case is 12,4 mm.
5. Identify the strain relief, according to TAB 3: for 12,4 diameter wire you could choose
among strain relief with different threads: M20, PG16 and GAS ⅝". We choose
PG16.
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