Connecting The Rs-485 Cable From The Heater To The Load Center - Pentair MT125 Installation And User Manual

Section 1. Installation Instructions
38

Connecting the RS-485 Cable from the Heater to the Load Center

To connect the MasterTemp heater to the load center:
BEFORE REMOVING THE HIGH VOLTAGE COVER PANEL FROM THE
LOAD CENTER OR POWER CENTER ENCLOSURE SWITCH OFF THE
POWER AT THE HOUSE MAIN CIRCUIT BREAKER BOX.
1. Switch OFF AC power to the enclosure at the main house panel circuit breaker.
2. Unlatch the front door latch and open the front door. Remove the two retaining screws from the High Voltage Cover
Panel and remove the panel. See Figure 35.
3. Loosen the two retaining screws securing from the top edge of the Outdoor Control Panel. Fold down the Outdoor
Control Panel to access the circuit board sockets connectors for the electrical connections.
Loosen Outdoor Control Panel
Retaining screws
Front door
LOW VOLTAGE
RACEWAY
Figure 35.
Note: Use a 22 AWG four conductor low voltage RS-485 cable to connect to the MasterTemp heater to the
IntelliCenter Control System Load Center:
4. Run the RS-485 cable from the heater's control board RS-485 COM port terminal connector to the Load Center or
Power Center. See wiring connection on the page 39.
5. Insert the cable into the one of the plastic grommet fittings, located on the lower left side of the enclosure and pull the
cable up through the low voltage to the circuit board, as shown below.
6. Strip back the outer jacket four inches. Strip back each conductor ¼-inch.
7. IntelliCenter Control System COM Port (J4 or J5): Insert the conductors into the COM Port screw terminals located
on the top of the IntelliCenter Control System circuit board (see diagram below). Secure the conductors with the screws.
For wiring details, refer to the pin configuration shown below. Note: Multiple conductors may be inserted into a single
screw terminal.
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
HiHigh Voltage Cover Panel slots (3)
Flip down the Outdoor Control Panel to ac-
Circuit board and low
voltage compartment
HigHighHigh Voltage Cover Panel Tabs (3)
460906 Rev. D 8/2020