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3.1.1.2

Automatic Purge Saving System Control Board

3.1.1.2.1 Voltage selection - Set the voltage selection

switch located at the lower edge of the power board for the
proper voltage.

NOTE:

Make certain that paper insulation in front of battery has been
removed.

3.1.1.2.2 Cycle selection

A cycle selector allows two choices in the fixed cycle mode and
three in the demand cycle mode. Cycle selection is accom-
plished by depressing the cycle selector switch repeatedly until
the light indicating the desired cycle mode illuminates.
1) Fixed cycle mode
10 minute - in this mode the dryer switches towers every 5
minutes. With 100

F (38

C) inlet air, a -40

F (-40

C) pres-

sure dew point is produced.
4 minute - In this mode the dryer switches towers every 2
minutes. With 100

F (38

C) inlet air, a -100

F (-73

pressure dew point is produced.
(2) Demand Cycle Mode
In this mode the dryer switches when the desiccant bed is
loaded as signalled by a calculated temperature rise. Unit can
be set to produce three outlet dew points, -40

F (-40

C), 0

(-17.8

C) and 40

F (4.4

C).

NOTE:

Automatic control will begin 1/2 cycle after start-up.

NOTE:

If a cycle change is made while dryer is operating, dryer will
finish previous cycle (right tower drying terminates) before
changing. Indicating light of newly selected mode will blink until
changeover is complete. If it is necessary to begin a new
selection immediately, shut unit off and on. (This is not
recommended if either tower is in the regeneration mode since
rapid repressurization could result.)

NOTE:

If switching to a cycle mode producing a lower dew point (e.g.
0

F to -40

F [ -17.8 to -40

C] ) while dryer is operating, one or

two days of operation may possibly be needed before the new
dew point is achieved.

3.1.2 SLOWLY pressurize dryer to full line pressure (open
inlet valve, outlet valve remains closed).

NOTE

During initial start-up check entire system for leaks. If neces-
sary, depressurize and correct any leaks.

3.1.3 Energize dryer using the power switch located on the
control panel.

NOTE

Standard controller - Switching failure alarm: alarm (light) may
be activated if unit is energized before it is pressurized. To
deactivate alarm, allow dryer to cycle to next step and press
the reset button.

3.1.4 Adjust the purge rate valve.
3.1.4.1 Determine:
1)Maximum working pressure (MWP) of dryer from the dryer
serial number tag
2) Air pressure at inlet to dryer
3) Cycle time setting (4 or 10 minutes)

For units with optional

Automatic Purge Saving System in the demand cycle mode
use the 10 minute setting.
3.1.4.2 Refer to

Table 3B for proper purge rate pressure

setting at the conditions found in 3.1.4.1
3.1.4.3 Adjust purge rate valve until purge flow indicator
reads required pressure setting.

NOTE

Adjustment must be made while a tower is purging (air
exhausting from muffler).

IMPORTANT

INSUFFICIENT PURGE AIR WILL EVENTUALLY RESULT IN
SATURATION OF DESICCANT BED AND WET AIR DOWN-
STREAM. MAKE CERTAIN THAT CYCLE TIME, PURGE
ECONOMIZER SWITCH, AND PURGE PRESSURE ARE
CORRECTLY SET.

3.1.5 Establish normal flow through dryer (open outlet
isolation valve). Close air by-pass valve if present.

NOTE

When dew points below -40

F (-40

C) are required, the dryer

must be run with an inlet flow rate of less than 50% of maxi-
mum until the desired dew point is attained. Depending on the
initial dryness of the desiccant, this can take as long as 2 to 3
days. This stabilization period is required on initial startup,
after dryer has been shutdown for extended periods of time, or
after dryer maintenance (desiccant change, etc.).

3.1.6 With the inlet pressure to the dryer at its minimum
level, readjust the purge pressure as determined in 3.1.4.

150 psig, 10.5 kgf/cm

M.W.P. models

INLET PRESSURE

60-100

110

120

130

140

150

(psig)