Carel humiFog UA1K0HM00, User Manual

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10. Trouble-Shooting
The identification and solution of the problem may vary depending on the version of the software: Section 8.12 “Service ” explains how
to display the version of the software.
PROBLEM POSSIBLE CAUSES CHECKING PROCEDURE SOLUTION
No power supply (controller
doesn't start). Incorrect power supply or fuses
on the transformer primary
blown. Use a voltage tester and check the power
supply at the terminals on the terminal
block. Refer to the wiring diagram Correct power supply. Replace any
blown fuses. See the wiring diagram
Fuse on transformer low
voltage side blown Use a tester to check the electrical
continuity at the ends of the fuse. Replace the fuse.
Transformer defective. Use a tester to check for 24 volts at the
secondary Replace the transformer
Controller or board defective Use a tester to check the correct power
supply to the board and the controller. Replace controller and board
Is the main switch on? Check the position of the main switch Turn the knob on the main switch
located on the door of the electrical
panel
No atomization at all or
insufficient atomization Is the remote ON-OFF contact
closed? Check the connection (or presence of
jumper) at correct wire terminals Connect appropriate terminals to the
remote contact, if not jumper the two
terminals.
Check control algorithm. Refer to control type menu Set correct control parameter type
No supply water Check for LP alarm on the controller
display Check the water supply upstream and
downstream of the filters and restore
the water supply
Low supply water pressure Calibrate the pressure of the supply
water to the correct limits
Water filter blocked Check the pressure measured by the
pressure gauges upstream and
downstream of the water filters Replace the dual gradient water filter
Water leaks from the rack or
the connection circuit between
humiFog and rack. Repair the causes of any water leaks.
Low discharge pressure replace the worn seals and valves on
the pump: (see the spare parts section
or pump manual)
Activation of VFD protection Alarm “VFD Fault” Check VFD configuration
Alarm EP, VFD on and high motor
temperature Electric motor overload
Nozzles blocked Nozzles do not atomize or atomize
incorrectly Clean the nozzles
Alarms “Low Inlet Pressure” Check the quality of the supply water
Capacity control solenoid
valves blocked Incorrect electrical connection Connect the power supply of the
solenoid valve correctly (see wiring
diagram)
Solenoid valve position not vertical Reposition the solenoid valve correctly
Some nozzles do not
atomize correctly Some capacity control solenoid
valves not open Position of solenoid valve not correctly
vertical Reposition the solenoid valve
Too many nozzles for the flow-
rate of the pump With maximum production demand some
solenoid valves do not open Choose a larger pump or decrease the
number of nozzles
Droplets atomized by the
nozzles too large Low pressure. Check the pressure displayed by the
pressure gauge. This must be
approximately between 860-1200 psi (60-
75 bar). Adjust the pressure using the cap on
the high pressure regulator
Too many nozzles for the flow-
rate of the pump Check the flow-rate of the pump and the
distribution system installed Decrease the number of nozzles;
choose a pump with a higher flow-rate
High pressure alarm Some lines downstream of the
pump are choked/blocked Check the pressure on the pressure gauge
located on the pump Restore the discharge circuit, high
pressure side, freeing the circuit from
any obstructions.
Continuous discharge of
water by the thermal valve Water temperature in the
bypass above 135°F Check that there are no blockages
downstream of the pump Restore the discharge circuit, high
pressure side, freeing the circuit from
any obstructions.
Tab 10.a