50
Part No. 6-847703-00 Rev. C00
Service Procedures
5. Remove pressure switch from bank regulator
fitting.
6. Disconnect black plastic vent tubing from inlet
relief valve (if equipped).
7. Remove 1/8" copper tube between bank
regulator elbow fitting and front panel bank
pressure gauge.
8. Loosen large union nut on inlet of bank
regulator.
9. Remove nylon tube from regulator dome.
10. Remove two bank regulator bracket mounting
nuts.
11. Remove regulator and bracket from manifold.
12. Remove pressure gauge and remaining
fittings from old regulator.
NOTE:
• Replacement bank regulator is supplied with
inlet nut and tailpiece. All other fittings,
pressure gauge and pressure switch must be
removed from old regulator and reused.
• Refer to Techniques For Leak-Tight Fittings
for recommendations concerning removal and
reassembly of fittings.
• Some pressure ports in new regulator body
will be shipped with pipe plugs. Remove
plugs where applicable.
• Check valves downstream of line regulators
will prevent back flow. These check valves
are intended to prevent gross leaks during
service and may not be bubble tight.
• Secondary supply pressure switch may be
separated from bank regulator without
disconnecting pressure switch wires from
control board. Carefully unscrew pressure
switch and allow wires to twist. Removal of
switch typically requires 4 - 5 revolutions.
When reinstalling switch, twist wires 4 - 5
revolutions in a counterclockwise direction so
that when tightened, wires will return to
approximate original position.
13. Noting regulator/bracket alignment, remove
regulator bracket from old regulator.
14. Install regulator bracket on new regulator.
Align bracket as noted above.
15. Using Teflon tape, reinstall pressure gauge
and fittings into new regulator body.
16. Attach new regulator and bracket to manifold's
base plate. Hand-tighten mounting nuts.
17. Tighten large nut on inlet of new bank
regulator.
18. Install 5/8" OD copper tube.
19. Tighten regulator bracket mounting nuts.
20. Install secondary supply pressure switch.
Remember to pre-twist pressure switch wires.
Tighten switch so that switch adjustment
opening (Figure 26) is facing outward.
21. Install 1/8" copper tube between regulator
fitting and front panel bank pressure gauge.
22. Reinstall nylon vent and dome tubing.
23. Slowly open liquid cylinders or high-pressure
cylinders and set bank regulator's output
pressure as described in Bank Regulator
Pressure Adjustment procedure.
24. Check all joints for leaks using an oxygen
compatible leak detector solution.
25 Loosen front panel hinge screws and return
front panel to upright position. Reinstall two
front panel screws and tighten hinge screws.
