9
left note the pressure reading on the right side gauge that is installed in the test port see figure 4, it should
be approx. 1050 psig then rotate the arrow clockwise to the right and note the pressure reading on the right
side gauge again it should read 1250 psig approx. Note what those two pressures are and determine the
mean between those two pressures it should be approx. 1150 psig. On the left preset regulator there is a
nut and lock washer fixing the adjusting screw. Remove the nut and lock washer, rotate the adjusting screw
in clockwise to increase the setting of the left side regulator to be equal to the mean of the right side two
pressure settings (approximately 1150 psig) it should require approximately between 1 to 2 turns to set that
pressure as indicated on the left side gauge installed in the test port located on the left side regulator.
Reinstall the lock washer and nut to fix the left side pressure setting. Cycle the unit thru simulated switchovers
by closing the inlet isolation valves while flowing gas downstream to ensure the set pressures are fixed
properly. Note that the pressures will drop slightly (approx. 30 psig) from static to flowing condition this is
normal. If left side pressure needs to be reset do so ensuring it falls in the approximate middle or mean of the
two right side switching pressures.
MAINTENANCE
On regular intervals, the system should be checked for leaks and proper function (see trouble shooting).
Any leaks in the system should be corrected immediately. The pigtail check valve should also be checked
for leaks when a depleted cylinder is removed. NOTE: the system inlet and pigtail should be pressurized
when check- ing for leaks. At no time should the preset regulator’s or priority valve regulator’s pressure
settings be changed.
Typical symptoms listed below indicate regulator malfunctions needing repair. Replace immediately with a
clean, repaired and tested, or new system.
1. Gas leakage at the line regulator outlet when the adjusting screw of the line regulator is completely
backed out.
2. With no flow through the system (downstream valves closed and adjusting screw in) line pressure
steadily increases above set pressure.
3. Gas leakage from spring case (adjusting screw/knob end of regulator).
4. Gas leakage from any joint.
5. Excessive drop in working pressure with regulator flowing gas.
6. Gas leakage from gauge
7. Gauge does not return to zero when not under gas pressure
8. Gauge does not consistently repeat the same reading.
10. The system makes a noise or hums.
both inlet gauges at the same time), please contact a CONCOA customer service personnel. Please be
prepared to give the following:
Model number
Gas service
Inlet pressure and type of gas supply
Outlet pressure
Approximate gas usage
NOTE: Maximum rated flow for these systems is 4000 SCFH.
TROUBLE SHOOTING
