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Look and listen for signs of leaks and repair as necessary before continuing. Note: If installing on a city supply, a properly sized thermal expansion tank is required and should be installed in accordance with the product installation manual. Note: If a water heater is installed in a closed water supply system, such as one having a back-flow preventer in the cold water supply, means shall be provided to control thermal expansion. Contact the water supplier or local plumbing inspector on how to control this situation. Note: If an external electrical source is utilized, the appliance, when installed,must be electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70. Note: The thermostat is adjusted to 120° F, when shipped from the factory. 4. Install the blowdown tube on the T&P relief valve outlet. Plumb to within 6 inches above a floor drain or as directed by plumbing code. Do not drill, puncture or otherwise penetrate the steel outer tank shell. Do not screw pipe hangers or other hardware into the exterior of the tank. BOILER PIPING 1. Plumb the circulator or zone valve on the BOILER SUPPLY line. 2. Pipe the BOILER RETURN connection to the boiler return line. Be sure the return line is NOT plumbed to the suction side of any heating circulators. This may require moving the heating circulator off the boiler tapping on packaged boilers. Failure to do so will result in overheating and tank damage when the heating system is in operation. 3. Install a weighted flow check on the boiler return line. This is not necessary on systems utilizing a zone valve to control the water heater temperature. 4. After completing the boiler piping, slowly open the boiler fill valve and pressurize the water heater loop. Check for leaks and repair as necessary. Proceed to the appropriate wiring section in this manual. EXPLOSION HAZARD. Do not install to a high pressure steam boiler (greater than 15 psig). An explosion could occur. LEFT SIDE . . . . . . . . . . .1" RIGHT SIDE . . . . . . . . . .1" TOP . . . . . . . . . . . . . . . . .9" REAR . . . . . . . . . . . . . . .1" FLOOR . . . . . . . . . . . . . .0" FRONT . . . . . . . . . . . . . .1" Clearance From Combustible Surfaces LEFT . . . . . . . . . . . . . . . 12" RIGHT . . . . . . . . . . . . . . 12" FRONT . . . . . . . . . . . . . 30" HEAD ROOM . . . . . . 36" REAR . . . . . . . . . . . . . 1" Recommended Clearance for Servicing PIPING USING ZONE VALVE REAR VIEW (FOR CLARITY) DRAIN BLOWDOWN TUBE TOP VIEW FROM FRONT WIRING AND AQUASTAT ON FRONT CAP HALF BOILER RETURN BOILER SUPPLY TEMPERATURE SENSOR WELL HOT WATER OUTLET COLD WATER SUPPLY 5. Ener-G-NET™ Wiring Ener-G-NET incorporates all of the temperature sensing and control necessary for HYDROMAX™ operation. Built-in switching relays may be wired to operate the boiler control and circulator pump or zone valve. The diagram below illustrates these internal switching functions. Examples of common wiring scenarios are provided on the following page. Normally Open Close on call for hot water Post-Purge function Front Panel Control Screws (4) Wiring Cover Ground Screw Conduit Holes (3) Normally Open Close on call for hot water Normally Closed Open on call for hot water Priority function Constant 24VAC or 120VAC Power In { { { { ORANGE ORANGE BLUE BLUE VIOLET VIOLET WHITE BLACK After wiring is complete, insert the white temperature sensor (thermistor) plug into the receptacle at the base of the digital control. Select the plug marked CIRCULATOR or ZONE VALVE based on the application. Zone valves can be slow actuating. Therefore, the zone valve sensor contains a built-in temperature offset to account for the time it takes the zone valve to fully close. This results in potable water temperature that is representative of the digital control temperature set point. This is why it is important to install the correct sensor into the digital control. See Page 2 for information regarding the selection of a circulator or zone valve. Temperature Water Sensor Plug Sensor Plug Water Sensor NOTE: This sensor should not be the primary means of water detection. US PATENT NO: 7,671,754 and other patents pending. NOTE: Line-voltage and safety-circuit wiring which is external to the water heater jacket when all panels are in place, and which is part of the appliance, shall be protected by metal conduit, metal-clad cable or raceways. “Power Limited Circuit Cable” needed not be provided with the protection specified above if it is securely fastened to the appliance jacket and follows the contour of the appliance jacket. Thermoelectric wiring shall be exempt from this provision. NOTE: Strain relief shall be provided for all conductors leaving an enclosure. For low-voltage wiring, strain relief at the point of exit from an enclosure is not necessary if, by wire location or support, protection is provided against accidental strain. NOTE: For models equipped with a water sensor, th...

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