Raypak 751 Installation And Operating Instructions Manual

Also see for 1001: OPERATING AND INSTALLATION Manual

Raypak 751 Installation And Operating Instructions Manual Manual pdf 23 page image

23Gas Pressure RegulatorThe gas pressure regulator is nominally preset to theoutlet values shown in Tables T and U, within +.1 in.WC. If an adjustment is needed, turn the adjustmentscrew clockwise to increase pressure or counterclock-wise to lower pressure.Venting of Diaphragm GasComponentsBoilers have gas train components that havediaphragms in their construction that are supplied witha bleed line connection that must be connected to theoutside atmosphere as required by NFGC or (forCanada) the B149 Installation code and applicableprovisions of local codes. Under NO circumstancesshall bleed lines terminate in the gas utilization equip-ment flue or exhaust system.ELECTRICAL POWERCONNECTIONSInstallations must follow these codes:· National Electrical Code and any other national,state, provincial or local codes or regulations havingjurisdiction.· Safety wiring must be N.E.C. Class 1.· Boiler must be electrically grounded as required byN.E.C. ANSI/NFPA 70-latest edition.· In Canada, C.S.A. C22. 1 C.E.C. Part 1.The boiler is wired for 120 VAC. The voltage is indicat-ed on the tie-in leads. Consult the wiring diagramshipped with the boiler in the instruction packet. The“TH” leads are connected to the remote tank controlstat, thermostat, or electronic boiler control as applica-ble. 24 Volts are supplied to this connection throughthe boiler transformer. DO NOT attach line voltage tothe “TH” leads. Before starting the boiler check toinsure proper voltage to the boiler and pump.Install a separate disconnect means for each load.Use appropriate-sized wire as defined by NEC, CSAand/or local code. All primary wiring should be 125% ofminimum rating.It is strongly recommended that all individually-pow-ered control modules and the boiler should besupplied from the same power source.Surge ProtectionMicroprocessor-based and solid state controls are vul-nerable to damage from voltage and amperagefluctuations in the power supply. All sensitive controlcomponents should be protected by a suitable com-mercial-grade surge protection device.If any of the original wire as supplied with the boilermust be replaced, it must be replaced with 105°C wireor its equivalent.Check the Power SourceUsing a volt-ohm meter (VOM), check the followingvoltages at the circuit breaker panel prior to connect-ing any equipment: Make sure proper polarity isfollowed and house ground is proven.AC = 108 Volts AC Minimum, 132 Volts MAXAB = 108 Volts AC Minimum, 132 Volts MAXBC = Must be less than 1.0 Volts ACMaking the Electrical ConnectionsRefer to Fig. 18 and the wiring diagram.1. Verify circuit breaker is properly sized by referringto boiler rating plate. A dedicated motor duty circuitbreaker should be provided.2. Turn off all power to the boiler. Verify that powerhas been turned off by testing with a volt-ohmmeter prior to working with any electrical connec-tions or components.3. Observe proper wire colors while making electricalconnections. Many electronic controls are polaritysensitive. Components damaged by improperelectrical installation are not covered by warranty.Fig. 17: Check Power Source