Carel heaterSteam UR Series, User Manual

Page: 34 / 72

34
ENG
“heaterSteam” +0300075EN - rel. 1.2 - 29.09.2015
9.3 Troubleshooting
Problema Cause Solution
The control does
not turn on
1. no electrical power supply;
2. humidifi er external switch in position 0 (OFF);
3. control connectors poorly installed;
4. fuses blown;
5. transformer faulty.
1. check the protection devices upstream of the humidifi er and the mains
power supply;
2. close the switch on the panel: position I (ON);
3. check that the connectors are properly installed on the terminal block;
4. check the state of fuses F1/F2;
5. check that the secondary circuit of the transformer has an output of 24
Vac.
The humidifi er does
not start
1. remote ON/OFF contact open (relay/terminals 7I - 8I);
2. the external regulator/humidistat or probe has not been connected
correctly;
3. probe/humidistat malfunction;
4. programming parameters are set incorrectly;
5. safety thermostat activated;
6. fan circuit breaker activated (H or T control);
1. close ON/OFF contacts (relay/terminals 7I - 8I);
2. check the external connection;
3. check the external signal;
4. reprogram the parameters correctly;
5. reset the thermostat after having eliminated the cause of the problem;
6. reset the circuit breaker after having eliminated the cause of the
problem;
The humidifi er fi lls
with water without
producing steam
1. steam outlet back-pressure too high;
2. leaking fl ow regulator in the water fi ll electrovalve (with leaks in the
water circuit);
3. level control malfunction;
4. cylinder inlet fi lter blocked;
5. lime in the fi ll tank;
6. drain solenoid valve malfunction;
1. check that the steam outlet pipe is not
bent or choked;
2. replace the feeding solenoid valve;
clean or replace the level gauge, if required;
3. clean the fi lter;
4. clean the fi ll tank;
5. check for the presence of 24Vac at the drain solenoid valve; clean the
drain solenoid valve;
Line circuit breaker
is activated
1. the line circuit breaker is rated too low;
2. resistors short-circuited
1. check that the circuit breaker is rated for a current of at least 1.5 times
the rated current of the humidifi er;
2. check, by measuring, the value of the resistors and replace them if
necessary
The humidifi er wets
the duct
1. the distributor is not installed correctly;
2. the system is rated too high;
3. the humidifi er is active when the duct fan is off ;
1. check that the steam distributor has been installed correctly;
2. reduce the steam production set on the control;
3. check the connection of the device (fl ow switch or diff erential pressure
switch) linked to the humidifi er for ventilation in the duct (terminals
7I - 8I)
The humidifi er wets
the fl oor below
1. the humidifi er drain pipe is blocked;
2. the water supply or overffl
ow circuit has leaks;
3. the condensate drain pipe does not drain the water back to the fi ll tank;
4. the steam outlet pipe is not properly attached to the cylinder;
1. clean the drain pipe in the bottom tank;
2. check the entire hydraulic circuit;
3. check the correct positioning of the condensate drain pipe in the fi ll
tank;
4. check the fastening of the pipe clamp on the steam outlet pipe.
Tab. 9.c