Carrier 50RLP Start-Up, Water Flow Switch Troubleshooting, Recommended Cables, Problem Solution

Table 5 — Water Flow Switch Troubleshooting

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	Check for air in the chilled water system.
when 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.
	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	Check for 24 vac across pins 1 and 3. These are small pins and caution should
when no flow is present	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.

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

MANUFACTURER	CABLE PART NO.
Alpha	2413 or 5463
American	A22503
Belden	8772
Columbia	02525

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 SET . The LID display will show: Controller Password

2.Press ENTER . 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 EXPN/EDIT key to toggle to the Status mode.

3.Key in the password and press ENTER . NOTE: The default password is 1111.

4.The LID display will show: Log in to Controller Logged In

14