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Resumen del manual
for propane) while the appliance is firing at 100% of rated input. 7. This is a reference pressure only and is not field adjustable. An ap pli ance supplied with a minimum of 4 inch es water column of gas supply pres sure will operate at the correct man i fold pressure as the burner input var ies with temperature demand. 8. Close the two gas pressure test cocks on the pressure test tree and remove the hoses to the manometer. 9. Close the front control panel. – – – – = FIELD CONNECTED MANIFOLD GAS PRESSURE 3.5" W.C.= gasP AIR INLET GAS WATER OUTLET WATER INLET FLUE OUTLET FIG. 37 Water Connections IMPORTANT Upon completion of any testing on the gas system, leak test all gas connections with a soap solution while the main burner is firing. Immediately repair any leak found in the gas train or related components. DO NOT operate an appliance with a leak in the gas train, valves or related gas piping. FIG. 36 Manifold Gas Pressure Measurement 27 28 Inlet and Outlet Connections For ease of service, install unions on inlet and outlet of the appliance. The connection to the appliance marked “Inlet” on the header should be used for return from the system. The con nec tion on the header marked “Outlet” is to be connected to the supply side of the system. Minimum Pipe Size Requirements Minimum water pipe connections to this appliance is 3 inch (76.2 mm) pipe for single unit installations installed not more than 70 equivalent feet (21.3 m) of pipe from the main system loop or storage tank. The equivalent number of straight feet of pipe for each valve and fitting in the connecting piping must be considered to properly arrive at the total equivalent feet of straight pipe in the field installed piping to the appliance. See the pip ing requirements in the heating boiler or water heater section of this manual. Consult factory if longer piping dis tances are required for a specific application. PRIMARY HEAT EXCHANGER FIG. 38 Primary Heat Exchanger This appliance uses two finned copper tube heat exchangers to maximize the heat transfer process. The primary heat exchanger is mounted in the inner jacket on the front side of the ap pli ance. The primary heat exchanger is composed of two circular glass lined cast iron headers with 24 vertical finned copper tubes. A series of “V” shaped baffles are installed between the individual tubes to control the movement of the flue products over the finned copper surface and increase heat transfer. Water enters the primary heat exchanger and makes four passes over the area exposed to direct heat from the burner. An internal cir cu lat ing pump ensures proper water flow over the heat transfer surfaces during burn er operation. Water temperatures in the primary heat exchanger are con trolled by the operation of the au to mat ic bypass assembly. Operation of the bypass maintains water temperatures above 130°F (54.4°C) in the primary heat exchanger to prevent flue gas condensation on the primary heat ex chang er surfaces. SECONDARY HEAT EXCHANGER FIG. 39 Secondary Heat Exchanger A secondary heat exchanger is mounted in an inner jacket chamber at the rear of the appliance. The secondary heat exchanger is constructed from two glass lined cast iron headers and multiple hor - i zon tal finned copper tubes. The secondary heat exchanger is mounted in the dis charge of the flue products from the primary heat exchanger. This allows additional heat to be absorbed from the flue products exhausted from the com bus tion process. The return water from the system passes through the secondary heat exchanger before it enters the primary heat exchanger. This allows the coolest return water temperatures to enter the secondary heat exchanger before proceeding to the primary heat exchanger. When return water tem per a tures are below approximately 130° F (54.4°C), the flue products passing over the secondary heat exchanger may be cooled below their dewpoint re sult ing in the formation of condensate. The secondary heat exchanger has a special high INTEGRAL BYPASS PRIMARY HEAT EXCHANGER PUMP BYPASS VALVE HOT WATER OUTLET SECONDARY HEAT EXCHANGER COLD WATER INLET FIG. 40 Bypass Piping with Valve Actuator and Pump temperature conformal coating to prevent any corrosive damage to the copper tubes or cast iron head ers from the low pH condensate. The protective coating is brown in color and covers both the headers and finned tube surfaces. The secondary heat exchanger is designed to maximize heat transfer efficiency by fully condensing flue products. The inner jacket that houses the secondary heat exchanger is designed to collect the flue gas con den sate and discharge it from the jacket. This appliance contains an integral bypass and circulating pump that con nects the primary and secondary heat exchangers. A floating-point automatic bypass valve regulates the flow of water through the bypass between the two heat exchangers. The valve is a butterfly type valve with an EPDM seat and a 24 VAC gear driven motorized actuat...
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