7
HB Series Desiccant Dryer Models 150-8000
ingersollrandproducts.com
7.0 PRINCIPLES OF OPERATION
7.7.1
BLOWER PURGE TIMER CYCLE
In the blower purge operating mode, the Microprocessor
Control controls an eight-hour cycle. The tower switch-over
occurs every four hours. After switch-over occurs, the
regenerating tower depressurizes for 2 minutes. The optional
EMS feature may reduce the heating time.
7.7.2
BLOWER PURGE TIMER CYCLE WITH SELECTABLE
COOL SWEEP
The Cool Sweep feature makes use of approximately 8% of
the dried compressed air for a portion of the drying cycle.
Using dry purge air cools the regenerating bed, which results
in a lower compressed air temperature at switchover as well
as reduced dew point spikes. In this mode, after switch-over
occurs, the regenerating tower depressurizes for 2 minutes.
Once the tower is depressurized, the blower and heater
operated as described in Section 7.3. The optional EMS
feature may reduce the heating time.
7.7.3
HEATLESS PRESSURE SWING TIMER CYCLE
In the heatless operating mode, the Microprocessor Control
controls a ten-minute cycle. The tower switch-over occurs
every five minutes. Ten seconds after tower switch-over
occurs, the regenerating tower depressurizes and tower
regeneration occurs for four minutes and 15 seconds. At that
time, tower repressurization begins.
7.8 RESTART MODES
The Microprocessor Controller includes a Shutdown Sequence that is
activated when the dryer OFF button is depressed. This feature
positions the valves to their failsafe position and resets the program and
is the recommended method of shutting down the dryer. When the dryer
is subsequently energized, the dryer starts at the beginning of the
program. Should, however, power be cut to the dryer before the
Shutdown Sequence has been initiated, the dryer can be configured to
restart in one of two restart modes.
7.8.1
MANUAL MODE (ZERO)
Ingersoll Rand dryers are shipped from the factory in the
Manual Mode. After power is re-supplied to the dryer, the user
will be presented with the "PRESS ON" display. The valve
switching and timing operations will only start once the ON
button is depressed. In this configuration, to restart the dryer,
the user must manually depress the ON button on the
Microprocessor Control's control panel.
7.8.2
AUTO RESTART MODE (LAST)
In this mode, the dryer will re-start automatically once power
is applied to the dryer. The Microprocessor Control will pick up
where it left off in the program once power is applied.
7.9 OPERATING TIMES
In the CUSTOMER MODE, the Microprocessor Controller provides
access to the operating hours of the dryer. The following describe the
method to access and review the operating and purge hours for the
dryer:
Depress the SELECT DISPLAY button until the OPERATING
TIMES display appears.
OPERATING TIMES
PRESS ENTER
SELECT
DISPLAY
Depressing the ENTER button enters the OPERATING TIMES
menu.
BEGIN TIMES
Depressing the SELECT DISPLAY button displays the
cumulative operating hours of the dryer.
OPERATING HOURS
000000065
SELECT
DISPLAY
PURGE HOURS
000000009
SELECT
DISPLAY
ENTER
Depressing the SELECT DISPLAY button displays the
cumulative hours the dryer has used purge air.
Depressing the ENTER button returns the display to the top of
the OPERATING TIMES menu.
BEGIN TIMES
SELECT
DISPLAY
Depressing the
button returns the controller to the
CUSTOMER MODE
OPERATING TIMES
PRESS ENTER
HEATER HOURS
000000009
SELECT
DISPLAY
Depressing the SELECT DISPLAY button displays the
cumulative hours the heater has been energized.
120.26 Dryer - Operation, Installation, Maintenance Manual, and Parts
