ESH150
–3PE~400V
Service Manual
41/56
Ref. NR-000144-ENG
To check the elements, proceed as follows:
With the power switch in the OFF position, use a tester to check the total resistance of the
heater, which should be that indicated in the table according to the power, voltage and number
for each installed heater elements, a higher value would indicate that one or more elements are
faulty.
Disconnect them and check that the individual value of each element is as shown in the table
according to the installed power and voltage.
Table 2. Elements Values List
(W)
(V)
x1 (
Ω)
x2 (
Ω)
x4 (
Ω)
x6 (
Ω)
900
400
177±2
88±2
44±2
29±2
1500
400
106±2
53±2
26±2
17±2
Under extreme environmental conditions, the heater might be affected and fail to reach the
required temperature. In this case, put the unit in a more favorable place, or use an auxiliary
heating system.
2.
Static relay
If the above checks have not revealed any problems, check the static relay.
3.
Automatic switch
The automatic switch protects the heating elements against voltage surges. With the power
disconnected, open the control panel and make sure the switch is primed (see circuit diagram).
If not, prime it.
4.
Temperature sensor
Temperature sensor malfunctions are automatically displayed on the control panel. In the event
of a malfunction, replace the sensor, being careful not to damage it during installation. The
sensor should be in contact with the element.
