Raypak 503A Installation & Operating Instructions Manual

Raypak 503A Installation & Operating Instructions Manual Manual pdf 21 page image

Making the Electrical ConnectionsRefer to Fig. 18-21.1. Verify that circuit breaker is properly sized byreferring to heater rating plate. A dedicated circuitbreaker should be provided.2. NOTE: Current draw noted on rating plate doesnot include pump current.3. 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.4. 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.5. Provide overload protection and a disconnectmeans for equipment serviceability as required bylocal and state code.6. Install heater controls, thermostats, or buildingmanagement systems in accordance with theapplicable manufacturers’ instructions.7. Conduit should not be used as the earth ground.21Field-Connected ControllersIt is strongly recommended that all individually-pow-ered control modules and the heater should besupplied from the same power source.NOTE: Field-supplied isolation relays should beinstalled when field-connected controllers aremounted more than 50 equivalent feet (18 AWG)from heater. See wiring diagrams.WARNING: 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. 19.)Fig. 18: Wiring Electrical ConnectionsFig. 19: Wiring ConnectionsFig. 20: 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.Check the Power SourceCheck the power source:AC = 108 VAC Minimum, 132 VAC MAXAB = 108 VAC Minimum, 132 VAC MAXBC = <1 VAC MaximumCIRCUITBREAKERWHITEGROUNDBLACKGREENA B C