9
f. Check drain operation - push Drain (push-to-test) button
to energize electric drain. A flow of condensate and/or
air should be present at the drain outlet.
D.
Using the RS-232 port
The RS-232 port is used to monitor dryer operation from a
host computer. A (1 to 1) DB-9 cable is required to connect
dryer and computer. For PC connections, data is transmitted
on pin 2, received on pin 3, ground is pin 5, pins 7 and 8 are
jumpered at dryer.
Operation is at fixed baud rate of 9,600; asynchronous format
is 8 bit, no parity, 1 stop bit (“8,N,1”). No check sum or error
correction values are provided. If required, request status string
two (or more) times and compare for agreement.
Request data by sending ASCII ? character (3FH). Response may
take up to two seconds as certain processing functions may
require completion before serial port is acknowledged.
Dryer responds with line feed (0AH), carriage return (0DH),
and character string: (1), (2), (3), (4), (5), (6), (7), (8), (9)
(1) = STX (start-of-text character, may appear as a smiley
face or some other character
(2) = 108, Control board ID
(3) = 0 or 1, Compressor running status (0=off, 1=on)
(4) = M or S, Operating Mode (M= MANUAL OVERRIDE, S
= SCHEDULE RUNNING)
(5) = xxxx, HOURS TO SERVICE
(6) = xxxxxx, TOTAL HOURS
(7) = xx, Alarm or Service Code (0=no alarm, 30=LOW
PRESSURE ALARM, 31=HIGH PRESSURE ALARM,
32=COMPRESSOR ALARM, 36=HIGH EVAP TEMP ALARM,
37=HEATER ALARM, 38=DRAIN ALARM, 39=SERVICE
DRYER, 41=TEMP SENSOR ALARM)
(8) = xx.x, Evaporator temperature (°F)
(9) = ETX, (end-of-text character, may appear as a heart
or some other character)
2.7 Electronic Demand Drain –
I-Controller Level 4
A. An automatic electric demand drain (EDD) discharges
condensate removed by the separator.
B. All standard I-Controller Level 4 models are supplied
with one EDD. Models with the additional (optional) cold
coalescing filter are supplied with a second EDD.
C. Models 200-750
For manual draining, convenient dryer depressurization,
and EDD service, a three-way valve assembly has been
installed at the bottom of the moisture separator (and
cold coalescing filter where applicable). Review the
following for proper drain function:
•
Automatic Draining - Valve handle should be
positioned parallel to the valve body (as shown), with
the arrow on the handle pointing toward the EDD.
In this position, condensate will flow from the bowl
to the EDD.
•
Drain Isolation (Shutdown) - Valve handle shall be
turned perpendicular to the valve body (rotate 90°).
In this position, condensate flow is shutoff.
•
Manual Draining - Drain valve handle shall be rotated
slightly past the drain isolation position to allow
throttling through the valve for manual discharge
and depressurization.
•
NOTE:
The quick disconnect fitting allows removal
of the entire drain assembly.
However, the unit
must be depressurized prior to disassembly or
serious injury may occur.
NOTE:
Discharge is at system pressure. Drain line should be
anchored.
NOTE:
Condensate may contain oil. Comply with applicable
laws concerning proper disposal.
D. Verify that isolation valves are open. If the drain fails to
discharge after the valve is energized, the electronic
control circuit will repeatedly energize the valve in an
attempt to clear the discharge port. If, after 60 seconds,
the drain still fails to discharge, the control circuit then
switches to the alarm mode. In this mode the valve
is de-energized and the red alarm light is activated
on the drain and the dryer controller. The valve is
then automatically energized every 80 seconds for 60
seconds. Check the drain operation. Push drain (push-
to-test) button on the Energy Management Monitor
control board to energize drain. A flow of condensate
and/or air should be present at the drain outlet. The
alarm mode automatically clears after the drain returns
to normal operation.
E. The condensate flows through the feed line
(1)
into
the condensate drain and accumulates in the housing
(2)
. A capacitive sensor
(3)
continuously registers the
liquid level. As soon as the container is filled, a fixed
waiting period begins during which more condensate
accumulates. After the waiting time has expired the pilot
valve (4) is then activated and the diaphragm
(5)
opens
the outlet line
(6)
for discharging the condensate.
When the condensate drain has been emptied, the outlet
line is closed again quickly and tightly without wasting
compressed air.