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WARNING
The Installation Instructions below apply for both Air Handler (Air-H) and Simple Building Management Switch
(S-BMS) Configurations.
1. Power OFF the water heater by unplugging the power cord or turning off the circuit breaker. The controller on
the water heater does not control the electrical power.
2. Remove the front panel of the water heater by removing the four screws that secure the panel in place.
3. Locate the wiring bundle and find the wiring tagged "S-BMS" or "Air-H." Temporarily remove the cable tie and
separate this connector from the main bundle. Fasten the cable tie around the remaining bundle.
4. Attach the switch circuit board using the mounting screw provided (A). If required, adjust the position of the
main wiring bundle to provide enough room.
5. Attach the harness plug labeled "S-BMS" or "Air-H" to the matching socket on the S-BMS/Air Handler Switch
(C).
6. For Air-H — Thermostat Wiring: Using the provided crimp connectors (B), connect the white and black leads of
the switch circuit board to the "W" contact on the indoor thermostat and fan coil (polarity is not important).
See Table 1 and Figures 24, and 27 through 32 for additional details. Final crimp connector should be
connected to the unused red wire lead on the switch circuit board.
For S-BMS: Using the provided crimp connectors, use the red and black leads as a Normally Open (NO)
connection for Building Management System (BMS). Final crimp connector should be connected to the unused
white wire lead on the switch circuit board. DIP Switch 4 on bank one must be in the OFF position. Refer to
Table 1 in the next section for more information.
6
OPU Installation Instructions
Ensure the power supply to the water heater and hydronic air handler is disconnected
before starting installation. Removing the front cover will expose live mains voltage
connections.
Figure 17
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C
B
A
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