FRANCO s. r. l. Instruction Manual AP
23
Use power cables of the appropriate cross-section according to the rated currents of the electrical
components (see section 5.1).
Ensure that the supply voltage complies with the table. Install a differential magnetothermal switch
upstream of the equipment. The motors used on AP series unit heaters are equipped with an internal
thermal protection with automatic reset.
Ensure that all electrical connections have been made according to the instructions in this manual, are
well insulated and comply with current regulations. Power cables must be replaced by the manufacturer,
his technical service department or otherwise by a qualified person in order to prevent any risk.
6 - TROUBLESHOOTING GUIDE
The operations described in this chapter must only be carried out by authorised and qualified
personnel, using suitable personal protective equipment. Before carrying out any work,
disconnect the power supply and cut off the water supply.
PROBLEM
CAUSE
SOLUTION
The machine does not start
Power failure
Check connections and mains voltage
Outgoing air flow is
insufficient
Incorrect supply voltage Check supply voltage
The hot water heater is
dirty or clogged
Checking that the heat exchanger is not
obstructed, clean if necessary
Defective motor
Check and, if necessary, replace the motor
The air leaving the unit
heater is not hot/cold
Hot/cold water
production system not
in operation or
defective
Check for leaks in the water supply circuit,
contact heating system service
The hot water heater is very
noisy or vibrates
Dirty fan
Cleaning the fan
Faulty fan
Check that the blades are not damaged or
cracked and that the motor turns freely,
replace the fan if necessary
Machine not correctly
installed, fasteners
loose
Check installation and tightening of screws,
nuts, etc. Correct/fix if necessary
