ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
45
Accessing the heater RS-485 COM Port
To access the heater control panel RS-485 COM port terminal, the RS-485 cable must be routed through the electrical
hole in the heater’s side panel.
To route the RS-485 cable through the heater’s panel to the control panel circuit board:
1. Release the two wing nuts that secure side panel. Remove the panel from the heater. See Figure 37.
2. Locate the small hole on the side panel, for the RS-485 cable. Use an appropriate size drill bit for the exible conduit
or strain relief to be used in the panel to drill a hole for the RS-485 wires. See Figure 38.
3. Install a exible conduit or a strain relief and securely attach to the heater panel. Note: The conduit or cable connector
should contain an insulating bushing or its equivalent to prevent abrasion of the RS 485 wires as it enters the exhaust
panel.
4. Strip back the outer jacket four inches of the cable. Strip back each conductor ¼-inch.
5. Insert the RS-485 cable (from the Load Center or Power Center) through the exible conduit or a strain relief into
the panel hole and securely attach to the heater panel.
6. Once the cable is inside the heater, route the cable to the control panel RS-485 terminal.
7. Using cable ties, secure to the RS-485 cable to the main wire harness that connects to heater’s control panel circuit
board.
8. Insert the three RS-485 wires (Pin 1-BLACK, 2-GRN, 3-YEL) into the RS-485 port screw terminal. Secure the
conductors with the screws. For wiring details, refer to the pin conguration on next page.
9. Heater Control Panel COM Port (J4): Insert the RS-485 connector onto the heater’s control panel RS-485 COM
Port screw terminal. Note Pin 1 is located on the left side of the terminal connector.
10. Replace the panel onto the heater. Be sure that there are no wires caught under the panel. Secure the panel with
the wing nuts.
11. Continue with “Connecting the RS-485 Cable from the Heater to the Load Center” on next paage.
Drill an appropriate size hole
for the exible conduit or
strain relief to be used.
to secure the
RS-485 wires.
Figure 37. Figure 38.
Connecting the ETi
®
250 Heater to the IntelliCenter Control System Load
Center via RS-485
For remote control and monitoring, the heater can be connected via the heater’s RS-485 COM port to the IntelliCenter
Control System COM port. The heater can be wired to the IntelliCenter Control System via a RS-485 connection. Up
to 16 heaters can be connected. The default address of a heater is 1. If additional heaters are connected, each heater
must have its own address. The address range is 1 to 16. The address for each heater is set from the heater’s front
LCD panel menus.
When a heater is being controlled via the RS-485 interface: • The heater front panel buttons are inactive. Press a
panel button to turn on the LCD display. “RS485 Control” is displayed. • Heater Alarms/Errors are displayed on
IntelliCenter’s control panel(s) Status Home screen.
Panel wing nuts
Control Panel
Electrical Connections
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