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Table 5 — Water Flow Switch Troubleshooting
Connect to CCN Communication Bus —
The
Aquazone™ system control panel primary controller connects
to the bus in a daisy chain arrangement. Negative pins on each
component must be connected to respective negative pins and
likewise positive pins on each component must be connected to
respective positive pins. The controller signal pins must be
wired to the signal ground pins. Wiring connections for CCN
must be made at the 3-pin plug. See Fig. 9.
At any baud (9600, 19200, 38400 baud), the number of
controllers is limited to 239 devices maximum. Bus length may
not exceed 4000 ft, with no more than 60 total devices on any
1000-ft section. Optically isolated RS-485 repeaters are
required every 1000 ft.
NOTE: Carrier device default is 9600 baud.
COMMUNICATION BUS WIRE SPECIFICATIONS —
The CCN Communication Bus wiring is field-supplied and
field-installed. It consists of shielded three-conductor cable
with drain (ground) wire. The cable selected must be identical
to the CCN Communication Bus wire used for the entire
network. See Table 6 for recommended cable.
Table 6 — Recommended Cables
NOTE: Conductors and drain wire must be at least 20 AWG
(American Wire Gage), stranded, and tinned copper. Individual
conductors must be insulated with PVC, PVC/nylon, vinyl,
Teflon, or polyethylene. An aluminum/polyester 100% foil
shield and an outer jacket of PVC, PVC/nylon, chrome vinyl,
or Teflon with a minimum operating temperature range of
–20
C to 60
C is required.
The communication bus shields must be tied together at
each system element. If the communication bus is entirely
within one building, the resulting continuous shield must be
connected to ground at only one single point. If the communi-
cation bus cable exits from one building and enters another
building, the shields must be connected to the grounds at a
lightning suppressor in each building (one point only).
START-UP
LID Power Up Display —
When power is applied to
the Aquazone System Control panel, the red LED on the top
front of the processor module will flash at a rapid pace (about
twice a second) for the first 20 seconds. This rapid flash will
then be replaced by a slower pace of about once per second.
The green LED below the red LED will start flashing. This
LED indicates input/output communications for accessory input
output modules and the LID display.
The first six red LEDs on the controller will light.
The yellow LED will flash when the controller is broadcast-
ing CCN messages to a laptop or other computer.
The LID display will show the controller identification,
time and date as shown below.
Aquazone System
hh:mm mm-dd-yy
Log On to the LID Display —
To Log On to the LID
display of the Aquazone System Control panel, perform the
following procedure:
1. Press 3 and then . The LID display will show:
Controller Password
2. Press . The LID display will show:
Log in to Controller
Enter Password
NOTE: The LID display has two modes: Edit mode and
Status/Maintenance mode. If the LID display is in Edit
mode, then the display will only show the word “pass-
word.” Press the key to toggle to the Status
mode.
3. Key in the password and press .
NOTE: The default password is 1111.
4. The LID display will show:
Log in to Controller
Logged In
PROBLEM SOLUTION
No display or output from the flow sensor
Check for 24 VAC across pins 1 and 3. These are small pins and caution should
be used when measuring the voltage in the harness so as not to damage the connector.
Check flow switch pin connections for damage.
Flow sensor indicates zero flow
when flow is present
Check for air in the chilled water system.
Check for 24 vac across pins 1 and 3. These are small pins and caution should be used
when measuring the voltage in the harness so as not to damage the connector.
Check for fouling on the sensor switch, which could inhibit the dissipation of heat from the probe.
Consider replacing the flow switch. The switch might be out of calibration,
the internal heater may have been damaged by extreme temperatures, pressure
or vibration, or mechanical damage to the tip of the device may have occurred.
Flow Sensor indicates flow
when no flow is present
Check for 24 vac across pins 1 and 3. These are small pins and caution should
be used when measuring the voltage in the harness so as not to damage the connector.
Low voltage can lead to less heat generated by the internal heater.
Consider replacing the flow switch. The switch might be out of calibration, the internal
heater may have been damaged by extreme temperatures, pressure or vibration, or
mechanical damage to the tip of the device may have occurred.
MANUFACTURER CABLE PART NO.
Alpha
2413 or 5463
American
A22503
Belden
8772
Columbia
02525
SET
ENTER
EXPN/EDIT
ENTER