Process Technology LUFRAN Instruction page 96

Maintenance Procedures (Continued):
M14:
Safety Contactors
The safety contactors are mounted on the high-voltage section of the electrical panel.
Each safety contactor should be inspected for proper operation every 6 months.
Procedure M14-1: Safety Contactor Inspection Procedure:
1) If the unit is in LOCAL mode, press the DISABLE HEATER button on the command
panel of the OIP. If the unit is in REMOTE mode disable the heater from the
customer supplied remote controller.
energizing.
2) Turn OFF power to the unit.
3) Continue water flow through the unit for this procedure. Allow the unit to cool to
ambient inlet temperature.
4) Open the front cabinet door.
5) Using an ohm meter, measure the continuity across each of the poles of each safety
contactor (ie. L1 to T1, etc).
continuity (infinite ohms).
6) If continuity is detected across any of the poles of the safety contactor at this time,
when power is turned off, the contactor must be replaced.
7) Press and hold the test button on the each safety contactor.
depressed, measure the continuity across each of the poles again. This time you
should measure continuity (low ohms).
Depress buttons here
8) If no continuity is detected while the button is depressed, the contactor must be
replaced.
M-43-01
Revision - Date: 08 – 04/06/15
This will also prevent the heaters from
Verify that the electrical supply is shut off, and
any necessary lockout/tagout devices are
properly installed.
With power turned off, you should measure no
Figure 51: Safety Contactor
- 96 -
With the button
Lufran Single Outlet Manual