Rheem P-M406 Operating Instructions - Page 27

TRANSFORMER WIRING 120 VAC WIRING For 120 VAC input power to the unit, connect the black wire to the "L1" or hot leg of the power supply. Connect the white wire to the "Ret" or neutral leg of the power supply. Attach the wire nut to the red wire. There should be no connection to the red wire for 120 VAC operation. For Lo NOx pool heaters attach a wire nut to each red wire independently. 120V ATMOSPHERIC HEATER SUPPLY SIDE HOT L1 BLACK RETURN or NEUTRAL WHITE GROUND GREEN BLACK WHITE GREEN HEATER 4 WIRES 120V LOW NOx HEATER HOT L1 BLACK BLACK BLACK SUPPLY SIDE RETURN or NEUTRAL WHITE WHITE WHITE HEATER 7 WIRES GREEN GREEN RED RED RED 240 VAC WIRING For 240 VAC input power to the unit, connect the black wire to the "L1" or hot leg of the power supply. Connect the red wire to the "L2" or second hot leg of the power supply. Attach the wire nut to the white wire. There should be no connection to the white wire for 240 VAC operation. For Lo NOx pool heaters attach a wire nut to each white wire independently. WARNING: DO NOT attempt to operate the heater at 208 VAC. 240V ATMOSPHERIC HEATER SUPPLY SIDE HOT L1 BLACK HOT L2 RED GREEN BLACK RED GREEN HEATER 4 WIRES 240V LOW NOx HEATER SUPPLY SIDE HOT L1 BLACK HOT L2 RED GROUND GREEN BLACK BLACK RED RED GREEN HEATER 7 WIRES WHITE WHITE WHITE Heater must be electrically grounded and bonded in accordance with local codes, or, in the absence of local codes, with the latest edition of the National Electrical Code, ANSI/NFPA 70. (Canada - Canadian Electrical Code, CSA C22.1, Part 1 and Part 2.) NOTE: If the transformer's primary side is wired for 120 VAC and 240 VAC is applied, damage to the transformer and PC board may result. Such damages are not covered under manufacturer's limited warranty. NOTE: Input power to the heater (120 or 240 VAC) can be supplied from the load (pump) side of time clock or directly from the GFCI power source. It is preferred that full-time power be supplied to the heater from the GFCI power source, and that the heater be controlled by the fireman's switch connection or using a two or three-wire remote. See pages 36-38. If using a switched GFCI power source, the heater could display false service indicators on the display panel if the pump is turned off. 27