Raypak 503-2003 Installation And Operating Instructions Manual

Also see for 503-2003: Installation & operating instructions

Raypak 503-2003 Installation And Operating Instructions Manual Manual pdf 21 page image

SECTION C: Installation19Manifold Gas Pressure(High Fire Values)ModelNo. Natural Gas Propane Gas503 -0.1 -0.1753 -0.1 -0.11003 -0.2 -0.21253 -0.1 -0.11503 -0.4 -0.31753 0.4 0.42003 0.6 0.6NOTE: Manifold pressures should be + 0.2” WC.Table I: Manifold Gas Pressure SettingsDuring normal operation, carbon dioxide should be 8.0to 9.0% at full fire for natural gas and between 9.0 and10.0% for propane gas. Carbon monoxide should be‹100ppm.Electrical Power ConnectionsInstallations must follow these codes:• National Electrical Code and any other national,state, provincial or local codes or regulations hav-ing jurisdiction.• Safety wiring must be NEC Class 1.• Heater must be electrically grounded as required bythe NEC.• In Canada, CSA C22. 1 C.E.C. Part 1.The MVB 503-1503 heaters are wired for 120 VAC, 12amps while the MVB 1753 & 2003 heaters are wiredfor 120 VAC, 18 amps. Consult the wiring diagramshipped with the heater. Before starting the heater,check to ensure proper voltage to the heater and pump.Boiler mounted pumps (up to ¾ hp) get their powersupply directly from the boiler power supply (connec-tions in rear wiring box). Install a circuit breaker sizedsufficiently for both the heater and the pump. Pumpslarger than ¾ hp must use a separate power supply andrun the power through the optional pump contactorwhich is located in the rear wiring box (see Fig. 16).Use appropriately-sized wire as defined by NEC, CSAand/or local codes. All primary wiring should be 125%of minimum rating.If any of the original wire as supplied with the heatermust be replaced, it must be replaced with 105°C wireor its equivalent.Fig. 16: Rear Wiring Box Electrical ConnectionsAll field wiring connections to the MVB heater aremade inside the rear wiring box as shown in Fig. 16.Pump power should be taken from terminals 2 (Com),3 (GND) and 6 (Hot) – ¾ hp and smaller ONLY.Power to the MVB heater should be connected to ter-minals 1, 2, and 3 as noted in Fig. 16. Sensors,interlocks, Enable/disable, and various options arewired into terminals 1 – 12 as noted in Fig. 16.Field-Connected ControllersIt is strongly recommended that all individually-powered control modules and the heater should be sup-plied from the same power source.NOTICE: Field-supplied isolation relays should beinstalled when field-connected controllers are mountedmore than 50 equivalent feet (18 Ga) from heater.Check the Power SourceWARNING: Using a multi-meter, check the followingvoltages at the circuit breaker panel prior to connectingany equipment. Make sure proper polarity is followedand house ground is proven. (See Fig. 17.)