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disconnect the PTC sensor terminals from the ST terminal block located on the cylinder cover (see Figs.: 7.9.1, ..., 7.14.1);
remove the electrical elements corresponding to the sensors being replaced;
unscrew the PTC sensor (Fig. 14.1.4, part. no. 18 or Fig. 14.1.5, part. no. 17) using a spanner on the hexagonal spigot,
accessible from the under side of the cover;
reassemble a new PTC sensor, replacing the O-ring and screwing it tight; reconnect the terminals to the ST terminal block;
reposition the electrical heating elements, making sure the PTC sensor enters into the corresponding sheath in the
aluminium casting.
NTC temperature sensor
As for the PTC sensors, the NTC sensor controlling the water temperature does not require regular maintenance.
To replace this sensor, remove the cylinder following the procedure described in Maintenance of the cylinder-boiler and then:
disconnect the terminals of the NTC sensor from the ST terminal block located on the cylinder cover (see Figs.: 7.9.1, ...,
7.14.1);
remove the sensor from the well (marked with a coloured dot) housed in the measuring sheath (Fig. 14.1.4, part. no. 8 or
Fig. 14.1.5, part. no. 17);
reposition and connect the new sensor in the place of the old one, making sure that it is completely inserted into the well.
Auxiliary circuit fuses
These measure 10.3 x 38mm and are housed in the fuse cartridge; to control the state of the fuses, check their continuity using
a tester.
Use the types of fuses indicated in Tab. 14.3.6.1.
UR002
fuses 1 and 2
*: single-phase **: three-phase
Solid state relays
(version with type H or T control module only)
The solid-state relays (one in the single-phase unit, two in the three-phase unit) can malfunction in one of two ways: by short-
circuit or burn-out. The respective consequences for the supply of power are: continuous conduction or permanent opening.
In the event of malfunctioning, check the conduction of the relay using a tester.
For the replacement of the solid-state relay:
turn the humidifier off;
open the disconnection switch in the power line (safety procedure);
disconnect the power and auxiliary cables from the solid-state relay terminal block;
remove the relay from the electrical panel by using a screwdriver to lower the fastening lever to the omega guide;
replace the new relay on the omega guide and reconnect the wires as before.
Cooling fan and circuit breaker
The solid-state relays are cooled by a fan placed above the relays, on
the right hand side of the appliance.
With insufficient ventilation the temperature of the electrical panel
may rise excessively until, reaching 65°C, power to the solid-state
relays is cut by a special klixon (heat sensor, used in this application
as circuit breaker - hereafter: circuit breaker), with manual reset
(indicated by S2 in the wiring diagram) and without an activation
signal.
In this case, check:
if the circuit breaker placed on the air conveyance deflector fitted
above the solid-state relay intervenes on pressing the reset button
(see Fig. 14.3.8.1);
that the fan power board, fitted in front of the deflector, is
powered (input terminals: 24Vac) and in turn powers the fan
(output terminals: 24Vdc).
If the fan is malfunctioning:
remove the deflector, after having unscrewed the two side nuts for fastening to the partition of the appliance;
replace the fan after having unscrewed the nuts for fastening to the side frame upright;
reassemble the deflector correctly, as its positioning can influence the effectiveness of the cooling.
Carel code +030221761
(version with type H or T control module only)
UR004
UR006 - 1
all fast-blow fuses with 1A capacity
(version with type H or T control module only)
models
*
**
UR010
UR006 - 3
48
preliminary version - rel. 2.0 - 03/09/99
heaterSteam
UR020
UR030
Tab. 14.3.6.1
F a n
S o lid s ta te relay (S SR )
(in th e m od e l, w h e re it is eq uip p ed )
Fig. 14.3.8.1
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Troubleshooting
