Process Technology Lufran LUF Series Manual page 53

Maintenance Procedures (Continued):
M6: Pressure Relief Valve (PRV), Bottom Half Plumbing
The PRV is located near the inlet water plumbing connection at the bottom of the heater side of the
cabinet. The PRV and the inlet plumbing should be inspected every 6 months to insure that there are no
leaks.
Procedure M6-1: PRV Inspection Procedure:
1) If the unit is in LOCAL mode, press the HEATER
ON/OFF button to the OFF position. If the unit is in
REMOTE mode disable the heater from the
customer supplied remote controller. This will also
prevent the heaters from energizing.
2) Continue water flow through the unit for this
procedure.
3) Open the rear cabinet door.
4) Inspect all of the plumbing connections on the
bottom half of the unit for leaks. Any leaks found
must be repaired.
5) Locate the PRV which is connected to the TEE
fitting that is adjacent to the inlet plumbing
connection (see figure).
6) Inspect the discharge tubing of the PRV. Confirm
that there is no liquid in the discharge tube. If the
PRV is leaking it must be replaced.
7) Confirm that the weep hole of the PRV is not
leaking.
Procedure M6-2: PRV Replacement Procedure:
1) If the unit is in LOCAL mode, press the HEATER ON/OFF button to the OFF position. If the unit is in
REMOTE mode disable the heater from the customer supplied remote controller. This will also
prevent the heaters from energizing.
2) Continue water flow through the unit and allow it to cool to ambient temperature. Shut off power to
the unit.
3) STOP flow of water to the unit and drain the heater. A provision for draining the unit must be installed
on the inlet plumbing when the unit is installed. If no method of draining the unit was provided, the
inlet water connection must be removed.
Vérifiez que l'alimentation électrique est coupée,
et tous les périphériques de verrouillage /
débranchement nécessaires sont correctement
installés.
4) Once the system is drained, open the rear cabinet door. The PRV is attached to the TEE on the inlet
plumbing.
M-43-25
Revision - Date 03-01-04-18
Figure 38: PRV location
Verify that the electrical supply is shut off, and any
necessary lockout/tagout devices are properly
installed.
52
LUF-Series Lufran Manual
Standard outlet, Standard Interface