Carel heaterSteam UR006 - Solid State Relay (SSR) Replacement

43
ENG
“heaterSteam” +0300075EN - rel. 1.2 - 29.09.2015
Models UR020-UR080
Procedure:
• unthread the 2 screws (V), remove the cover (C) and the drain pump;
• Check the condition of gasket (G) and replace it, if required.
VC
G
Fig. 10.x Fig. 10.y
Solid state relay (SSR)
The solid-state relays (one in the single-phase units, two or three in the
three-phase unit) may damage in two modes: by short-circuit or burn-out.
With regard to power supply, the possible consequences are: continuous
conduction or permanent opening. In the event of malfunctioning,
check the conduction of the relay using a tester.
!
drain
x 1000
Steam
Drain
Fill
Alarm
PRG
reset
SEL
I
Fig. 10.z Fig. 10.aa
For the replacement of the solid-state relay:
• turn the humidi er o ;
• open the breaker of the power supply line;
• 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 DIN guide;
• hook the guide to the new relay and reconnect the wires.
Fan
SSR relays are cooled by a fan at the base of the humidi er, for models
UR002-UR013, and placed on top, on the right side of the unit for models
UR020-UR080. With insu cient ventilation the temperature of the
electrical panel may rise excessively until it reaches 65°C. Power to the
solid-state relays is cut o by a special Klixon (heat sensor) with manual
reset (see the wiring diagram), without signalling the intervention. In this
case, check:
• if an SSR thermal breaker has been triggered;
• whether the fan control board is powered (check the input terminals:
24 Vac) and in turn powers the fan (output terminals: 24 Vdc) (only for
models up to 10 Kg/h).
!
drain
x 1000
Steam
Drain
Fill
Alarm
PRG
reset
SEL
I
F
F
Fig. 10.ab Fig. 10.ac
If the fan is faulty:
Models UR002-UR013:
• replace it after having unthreaded the fastening screws;
Models UR020-UR080:
• unscrew the 4 fastening screws placed on the right side of the
structural work and extract the fan from the inside of the panel.
In case of malfunction, the thermal switch can be replaced unscrewing
the fastening screws.
Note:
• for models UR002-UR013 the fan is of suction type;
• for models UR020-UR080 the fan is of exhaust type.
10.8 Mechanical discharge of water in the
cylinder
Discharge by gravity without turning on the humidi er is recommended if:
• the humidi er is out of order
• it is required to empty the cylinder without turning on the humidi er.
Procedure:
• make sure the humidi er is not powered;
• remove the front panel;
• enable the mechanical device located below the cylinder (A).
Models UR002-UR013
A
Fig. 10.ad