Perma Pure Mini-GASS - Manual (Page 30)

30
Mini-GASS User Manual | Original Instructions
PERMA PURE LLC
Mini-GASS™ User’s Manual
Doc. #212: Revision: 00A
Page 30 of 32
APPENDIX E: Z-Purge
Operation
With the inert gas supply connected, enclosure power de-energized and alarm system (if utilized).
Follow steps to purge system:
1. Carefully read Start-Up Instruction Nameplate on system.
2. Check operation of the Enclosure Protection Vent (EPV-1, if utilized), opening it manually
several times (see helpful hints below)
3. Seal protected enclosures.
4. Open Enclosure Pressure Control Regulator, but turning CW, to set Enclosure Pressure
Indicator at “Safe” pressure.
5. Ensure the Protection System Enclosure Pressure Indicator maintains a “Safe” pressure
for one minute.
6. Standby for exchange time as specified on the Instruction Nameplate, then energize the
protected enclosure power.
7. Ensure the Enclosure Pressure Indicator maintains a “Safe” pressure before leaving
system unattended.
Z-Purge Troubleshooting
Problem or Fault Possible Causes Corrective Action
Enclosure pressure control regulator will
not hold a safe pressure. Leakage around gasketing, covers,
seams, piping and tubing connections,
conduit connections and electrical
conduit seal of the enclosure. Tighten enclosure latches: silicone
sealant can be applied from inside the
protected enclosure where tightening is
not feasible.
Enclosure pressure indicator reading is
difficult to stabilize. In sufficient enclosure leakage or
opening of the venturi orifice is crimped
too small. Remove the orifice, cut off crimped end
and ream tube, then recrimp and
reinstall tube. As tube is shortened,
sensitivity decreases allowing easier
setpoint on the enclosure.
Enclosure pressure Indicator “Drifts” up
or down from the “Safe” pressure setting. Application involves a small, tightly
sealed enclosure and/or a fluctuating
protective gas supply. Pre-regulate gas supply upstream of the
enclosure protection system to 5 psi
maximum.
Enclosure pressure loss alarm switch
does not appear to be operating. Pressure switch is out of calibration. Calibrate by slowly adjusting
counterclockwise to decrease setpoint
and clockwise to increase setpoint.
Helpful Hints
- The term “Safe” pressure for purposes of this manual is defined as follows:
Class I = a minimum 0.25 inch of water column pressure.
Class II = a minimum 1.0 inch of water column pressure.
- Regulator may be in the locked position upon arrival. To adjust regulator, pull handle to outward position.
- To test the vent’s operation, gently prod the vent flapper open with a soft pointed object (i.e. eraser end
of pencil) ensuring that the vent works freely.