3 - 6
Operation
3.
Close the System Inlet Isolation Valve (customer sup-
plied).
IMPORTANT: Inlet and Outlet Isolation Valves
MUST be closed to prevent moisture overloading of
desiccant beds, due to continuous flow without regen-
eration.
4.
Close the Moisture Indicator Supply Valve (if dryer
has been so-equipped). This MUST be done to pre-
vent depressurization of the pilot gas supply, which in
turn, will eventually result in dryer depressurization.
5.
Shutdown is now complete. The dryer may be left
pressurized during periods of non-use, if desired.
However, if any servicing or maintenance is to be
performed, ensure that the dryer is depressurized
BEFORE beginning work. Proceed to Step 6 for de-
pressurization instructions.
WARNING!
Ensure that the system is de-energized, valve iso-
lated, and fully depressurized before attempting
to remove or disassemble any component or sub-
assembly. Failure to do so may result in serious
personal injury and/or equipment damage.
6.
To depressurize dryer, proceed as follows:
a) Open customer-supplied System Bypass Valve
(if gas system has been so-equipped).
b) Close the Pilot Gas Supply Valve.
c)
Open the Pilot Gas Filter's Bleed Valve. Allow
pilot gas system to depressurize through the Pilot
Gas Filter’s Bleed Valve. When pilot gas pres-
sure is sufficiently reduced, the Purge Exhaust
Switching Valves will automatically open to de-
pressurize dryer through Purge Exhaust Muffler.
d) SLOWLY open customer supplied depressuriza-
tion valve to vent the dryer internal air pressure.
e) When all dryer pressure gauges indicate zero
pressure, close the depressurization valve. De-
pressurization is complete.
