Check the power source:AC = 108 VAC Minimum, 132 VAC MAXAB = 108 VAC Minimum, 132 VAC MAXBC = <1 VAC MaximumCheck the Power SourceWARNING: Using a multi-meter, check thefollowing voltages at the circuit breaker panel prior toconnecting any equipment. Make sure properpolarity is followed and house ground is proven.(See Fig. 13.)Fig. 12: Wiring ConnectionsFig. 13: Multi-meterNOTE: Minimum 18 AWG, 105°C, stranded wiremust be used for all low voltage (less than 30 volts)external connections to the unit. Solid conductorsshould not be used because they can causeexcessive tension on contact points. Install conduitas appropriate. All high voltage wires must be thesame size (105°C, stranded wire) as the ones on theunit or larger.Making the Electrical ConnectionsRefer to Fig. 12–20.1. Verify that circuit breaker is properly sized byreferring to heater rating plate. A dedicated circuitbreaker should be provided and sized for theheater and all pumps powered through the heater.2. Turn off all power to the heater. Verify that powerhas been turned off by testing with a multi-meterprior to working with any electrical connections orcomponents at the J-box inside the heater.3. Observe proper wire colors while making electri-cal connections. Many electronic controls arepolarity sensitive. Components damaged by im-proper electrical installation are not covered bywarranty.4. Provide overload protection and a disconnectmeans for equipment serviceability as required bylocal and state code.5. Install heater controls, thermostats, or buildingmanagement systems in accordance with theapplicable manufacturers’ instructions.6. Conduit should not be used as the earth ground.NOTE: A grounding electrode conductor shall beused to connect the equipment groundingconductors, the equipment enclosures, and thegrounded service conductor to the groundingelectrode.NOTE: Current draw noted on rating plate does notinclude pump current.20