6
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 reapplied. Had drain been
ready to drain before the loss of power, the drain bowl’s
capacity would prevent downstream 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.
2.6 I-Controller Level 4
(Optional on models RNC200-RNC750)
Energize dryer. Green power on light will illuminate.
IMPORTANT: Energize dryer disconnect switch (provided by
others, see NEC) 24 hours before refrigeration compressor
is started! Never use the disconnect switch to shutdown the
dryer for a extended period of time (except for repair). Failure
to follow these instructions may result in a non-warrantable
compressor failure.
NOTE: If there is no power to the control board for a period
of two weeks or more, it may return to the default mode.
A.
Program Monitor
Press and hold Program Mode button until Main Menu screen
appears. Use the Up and Down arrow buttons to scroll through
the list of submenu choices. Press Enter button to view the
submenu that is displayed. Press ESC to exit the Main Menu
and return to Display mode.
Table 2 LED Legend
LED
Illuminated
Minutes
between
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
Condensate Draining
(Flashes in
programming mode)
Drain Interval
Program
Dew Point
Temperature Indica-
tor
Drain Interval
Selector
(LED illuminated
indicates drain cycle
setting)
Table 1 Timed drain illuminated LED Settings
Inlet Pressure
75
100*
125
150
200
225
Dryer Model
RNC100
3
3
4
4
4
4
RNC125
3
3
3
3
4
4
RNC150
2
3
3
3
3
4
RNC200
2
3
3
3
3
3
RNC250
2
2
2
3
3
3
RNC300
1
2
2
2
3
3
RNC400
1
2
2
3
3
4
RNC500
1
1
2
2
3
3
RNC600
1
1
1
2
2
3
RNC750
1
1
1
1
2
2
* 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.
2.3 Timer Drain
(Only Models with I-Controller Level 2)
NOTE:
The Timer Drain LED level has been pre-programmed
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 efficiency. 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.
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.
