25
5.5 Probe in blowdown (or condensate) line - CP10
For most applications the 1.25 m (4 ft) heat resisting probe cable will need to be extended
using a junction box. If not, link terminals 50 to 51, and 52 to 53.
Note: Whilst pairs of conductors are linked at the junction box, the four wire connection is
required to compensate for voltage drop.
5.6 Probe in boiler - CP30
The probe requires a 4 core screened cable connection.
Whilst pairs of conductors are linked at the probe, the four-wire connection compensates for
voltage drop along the cable. See the CP30 IMI for further details.
5.7 Four wire Pt100
Will have two wires one colour, and two wires of another colour.
Link one of the pairs at the junction box, and connect to terminal 56.
Connect one of the remaining two wires to terminal 57, and the other to terminal 58.
5.8 Temperature probe wiring
For the TP20, when the cable is to be longer than the 1.25 m (4 ft) supplied, a junction
box and 3 core-screened cable will be needed. Colour codes for sensor wires vary, but a
three-wire sensor will normally have 2 wires of one colour, and 1 wire of a different colour.
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