5
2.4 Timer Drain Programming Mode
1.
Press the “Drain Interval Program” button (the
“Condensate Draining” LED will start to flash, and
the illuminated LED on the “Dew Point Temperature
Indicator” will identify the factory setting for “Minutes
Between Drain Cycles.”
(See Table 1)
2.
Press and release the “Drain Interval Selector” button
to sequence the “Minutes Between Drain Cycle LED’s”
from left to right until reaching your selection. The
“Red” LED is not used (Reference Table 2 for “Drain
Cycle Intervals”)
3.
To initiate the new setting, press the “Drain Interval
Program” button (this will store the new setting and
exit the program).
4.
Exiting the Program will cause the Timer Drain to
discharge and begin a new cycle.
Note: Failure to perform step 3 within 25 seconds of
completing step 2 will cause the unit to revert back to the
previous setting.
Note: In the event of a brief or extended period of
power loss, the unit will retain the existing program
setting and will begin a new cycle once power is reap-
plied. Had drain been ready to drain before the loss of
power, the drain bowl’s capacity would prevent down-
stream flooding. Condensate will drain completely within
a couple of cycles. (Manually pressing the “Push-to-Test”
button would drain bowl immediately)
2.5 Operating check points
Check the following on a periodic basis:
A. Green power on light is illuminated.
B. Dewpoint indicator is in green area.
C. Condensate is discharging from drain.
1.
For minimum inlet air pressures that fall between
column values, the setting for the lower pressure is
recommended. (i.e. select the 100 psi column values
for 124 psi inlet pressure listed in Table 1.)
2.
Where the dryer is consistently operating at less than
maximum capacity, it may be possible to increase the
LED set point to minimize air loss. Discretionary
adjustments to the dryer should only be made on a
hot, humid day when the maximum expected air load
is flowing through the dryer. Failure to do so may
prevent the condensate from draining completely
when operating under peak load conditions.
Table 1 Timed drain illuminated LED Settings
2.2 Start-up
1.
Confirm On/Off Switch is in the “Off” position.
2.
Energize dryer. Green power-on light will illuminate.
2.3 Timer Drain Option
(Only Models with I-Controller Level 2)
Note: The Timer Drain LED level has been pre-pro-
grammed at the factory for your specific RNC Series
dryer. Programming is based upon a minimum of 100 psi
saturated inlet air pressure and maximum energy effi-
ciency. The drain open time is fixed at one second and a
small amount of air will be exhausted with each cycle.
Generally, no adjustment to the timer is required.
If water is present downstream of the
dryer, always verify that any condensate drains installed
upstream of the dryer are draining properly before
attempting to readjust the LED setting.
Inlet Pressure
75
100*
125
150
200
225
RNC25
4
5
5
5
6
6
RNC35
4
4
4
4
5
5
RNC50
3
3
4
4
4
4
RNC75
4
4
4
4
5
5
RNC100
3
3
4
4
4
4
Dr
yer Model
Table 2 LED Legend
* Recommended and pre-programmed factory settings for each RNC Series model dryer.
Assumes CAGI ADF100 inlet conditions with 100
°
F ambient and 10
°
F air-cooled
aftercooler approach temperature.
Minutes
LED
between
Illuminated
Drain Cycles
1
st
1
2
nd
3
3
rd
5
4
th
10
5
th
20
6
th
30
7
th
40
8
th
50
9
th
60
33
°
F......................39
°
F
1
°
C.......................4
°
C
Dew point Temperature
Indicator
Drain
Interval
Selector
Condensate
draining LED
(Flashes in
programming
mode)
Drain Interval
Program
(LED Illuminated indicates
drain cycle time)
