Vertiv | Liebert PEX+ Chilled Water | User Manual 93
System Operation and Maintenance
7.9. Electric Heater Maintenance Guide
The electric reheating shown in Figure 7-3, three temperature switches are serially connected to the control
loop inside the electric heater, including two automatic reset switches and one manual reset switch. Check the
electrical heating for rust. Use an iron brush to get rid of or replace the rust, if possible, if the rustiness is immense
or if some damage occurs.
1. Check the rustiness condition of the electric heater; use the iron brush to get rid of the rust or replace it
according to actual conditions.
2. When heating is required, but heating is not eective, or no heating eect is observed, a multimeter should be
used to check whether the cable connected to the temperature switch is functioning correctly to ensure that
the three temperature switches are normal.
3. If the cable is not functioning properly, remove the electrical heater and check if the manual reset switch
is disconnected. Next, check the automatic reset switches or the electric heater pipe for damage or faulty
condition.
No. Description No. Description
1 Manual reset temp switch 3 Auto reset temp switch
2 Auto reset temp switch
Figure 7-3 PTC Electrical Heating
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