19
19
problem or Fault
Enclosure pressure control regulator
will not hold a safe pressure.
Enclosure pressure indicator reading
is difficult to stabilize.
Enclosure Pressure Indicator "Drifts"
up or down from the "Safe" pressure
setting.
Enclosure pressure loss alarm switch
does not appear to be operating
(if utilized).
Problems persists, or if the system
does not appear to be operating
properly.
troubleshooting procedures
possible Causes
Leakage around gasketing, covers,
seams, piping and tubing connections,
conduit connections and electrical
conduit seals of the enclosure.
Insufficient enclosure leakage or
opening of the venturi orifice is crimped
too small.
Application involves a small, tightly
sealed enclosure and/or a fluctuating
protective gas supply.
Pressure switch is out of calibration.
Corrective action
Tighten enclosure latches. Where
tightening is not feasible, and
gasketing materials are not practical,
holes or gaps can be closed with
silicone sealant applied from inside
the protected enclosure.
Remove the orifice, cut off the
crimped end and ream the tube, then
recrimp and reinstall the tube to note
effect. As tube is shortened, reamed,
and recrimped, sensitivity decreases,
allowing easier adjustment of setpoint
on the enclosure.
Pre-regulate the protective gas supply
upstream of the enclosure protection
system to 5 psi maximum.
For dramatic fluctuations in the
protective gas supply, it may be
neccessary to utilize a self-relieving
low flow precision regulator to pre-
regulate the protective gas supply.
Calibrate by slowly adjusting
counterclockwise to decrease the
setpoint, and clockwise to raise the
setpoint. (Do not attempt to calibrate
the switch until all efforts to make the
switch respond properly have failed)
Persisting problems
Contact Pentair Technical Products at
(763) 422-2211 for more information.
This section covers the most common problems documented with these systems. Any problems not covered in this
section should be addressed directly to our factory. Please address all service needs to Pentair Technical Products
(763) 422-2211.
RSPSupply - 1-888-532-2706 - www.RSPSupply.com
http://www.RSPSupply.com/p-6798-Hoffman-A1001YZUMC2-Purging-Pressurization-System-10-CF.aspx