Process Technology LUFRAN Instruction page 81

Maintenance Procedures (Continued):
Procedure M5-2: Humidistat Replacement 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.
2) Allow the unit to cool to ambient temperature. Press the POWER OFF button on the
front of the unit.
3) Shut down the unit. Turn off main power. Shut off the purge gas supply
4) Open the rear cabinet door.
5) Remove the black plastic enclosure cover on the humidistat.
6) Remove female disconnect terminal connectors.
7) Remove screw from the center of the humidistat switch and remove the humidistat
from the unit. Install new humidistat and replace center screw to mount the switch to
the unit.
Caution: Do not over tighten. The humidistat device needs to be fairly loose in the
black box so that the switch setting is not impeded.
8) Replace female disconnect terminal connectors.
9) Remove electrical lockout/tag out devices as required by facility guidelines. Turn
ON POWER to the unit.
10) Perform procedure M5-1: Humidistat Inspection Procedure and verify that humidistat
is operating properly by performing the humidistat inspection procedure listed in this
section of the manual.
11) Replace the black plastic enclosure cover on the humidistat.
12) Replace the rear cabinet panel.
M-43-01
Revision - Date: 08 – 04/06/15
Verify that the electrical supply and the purge
gas supply is shut off, and any necessary
lockout/tagout devices are properly installed.
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Lufran Single Outlet Manual