Filter
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3 - 6 Operation
5. Close any manual vent or drain valves installed in
prefilter and afterfilter assemblies.
6. If the prefilter assembly utilized was factory-
equipped with an automatic drain valve or drain trap,
inspect for, and remove pipe plug or cap which may
have been installed in drain port for shipping pur-
poses.
7. Ensure that all associated pipe and tubing connec-
tions, flanges, unions, plugs, mounting bolts, pipe
hangers, etc., have been checked tight and/or prop-
erly secured.
IMPORTANT: It is recommended that the System's
process gas output not be consumed or used at the
intended points of use until the Start-Up and any re-
lated adjustments have been completed, and the
system is producing process gas of the required
quality. The quality of the process gas should be
verified through test and analysis when a specific
quality process gas is required.
8. Supply compressed air up to Inlet Isolation Valve.
9. Close the Pilot Gas Supply Valve and pressurize the
pilot gas system with compressed gas to line pres-
sure. Use the Ball Valve located in the pilot gas line
prior to the Pilot Gas Filter and after the Pilot Gas
Supply Valve. Both desiccant chamber Inlet Valves
will open and both Purge Exhaust Valves will close.
10. Supply pressure to system by slowly opening the
System Inlet Isolation Valve (customer supplied).
Both Inlet Switching Valves are open. Both Purge
Exhaust Switching Valves are closed (Refer to step
9). The desiccant chambers will immediately begin
pressurizing to system pressure as indicated by
chamber pressure gauges.
11. When both chambers are at supply pressure, open
the Pilot Gas Supply Valve and disconnect the gas
supply to the pilot gas system at the Start-Up Ball
Valve.
12. The Moisture Indicator’s (if dryer so-equipped) bleed
valve is installed directly into the back of the
indicator’s body. Close the Indicator’s Bleed Valve.
FULLY open the Moisture Indicator Supply Valve.
13. Soap bubble test all external piping, fittings, and con-
nections. Locate and repair all noted points of leak-
age. Do not soap bubble test components lo-
cated inside dryer control system's enclosure.
Note: Small leaks noted in inlet piping to the dryer
will not affect operation, other than a slight loss of
pressure supplied to the dryer. HOWEVER, any gas
leaks, (no matter how small), detected at, or down-
stream of the dryer outlet MUST BE FIXED to ensure
that the dryer will provide a continuous supply of pro-
cess gas at specified dew point, to intended points-
of-use.
IMPORTANT: Water molecules can diffuse through
a pinhole-size leak even though pressure inside the
piping is several hundred PSIG. It is not uncommon
to have a minute pinhole leak in a gas line cause an
increase in dew point from -40°F to -10°F at a dis-
tance of forty or more feet downstream of the leak.
14. SLOWLY open the System Outlet Isolation Valve
(customer supplied), while monitoring the Outlet
Pressure Gauge (if dryer so-equipped). DO NOT per-
mit the Dryer's Outlet Pressure Gauge to exceed a
5% drop in pressure while pressurizing downstream
piping.
15. Close the System Bypass Valve (if gas system has
been so-equipped).
16. Open and adjust the Moisture Indicator’s Bleed Valve
until a very slight, continuous gas bleed is felt ex-
hausting from the bleed valve’s exhaust port. Ensure
that the granular indicator crystals remain motionless
after final adjustment.
17. Energize the dryer’s electrical power supply.
18. Refer to Appendix A (Appendix C for -100°F pdp) of
this manual and calculate your dryer model's purge
pressure setting as instructed.
19. SLOWLY rotate dryer’s Purge Adjusting Valve until
the Purge Pressure Indicator indicates the calculated
purge pressure setting. (See following Note).
Note: The purge pressure can only be read and ad-
justed when an off-stream desiccant chamber has de-
pressurized for regeneration. (When the off-stream
chamber is pressurized, the Purge Pressure Indicator
will read “system pressure”.)
For dryers with the Hydrobloc Compu-Save Energy
Management System: During operation in the Energy
Management Mode, the off-stream chamber may re-
main pressurized (in ENERGY MANAGEMENT AC-
TIVE). If this condition is noted, proceed as follows to
adjust purge pressure.
a) Open Dryer Control System Enclosure. Locate
DIP switches on MEC CPU Board.
b) Switch DIP switch position 7 to OFF position
(down). De-energize dryer’s electrical power sup-
ply for approximately fifteen (15) seconds; then
re-energize. Dryer is now in Fixed Cycle Opera-
tion. The off-stream chamber will depressurize to
atmosphere for regeneration.
c) Calculate and set purge pressure as previously
instructed.
d) Return DIP switch position 7 to ON position.
De-energize the dryer’s electrical power supply
for approximately fifteen (15) seconds; then re-
energize. Dryer should be in Compu-Save En-
ergy Saver Mode.