valutazioni - 2, GPA: 4.5 ( )

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See external bypass valve section for details. POLYMER HEADERS Fig.# 2012 CAST IRON HEADERS (ASME) 21 POLYMER HEADERS (STANDARD MODELS) Before attaching the 2-inch unions to the inlet/outlet header, make sure the O-rings are properly seated in the grooves. Use AquaLube or equivalent non-petroleum- based lubricant on the O-ring. Hand tighten the unions. Glue PVC piping directly to the unions. GASKET DESIGN #1: Accepts 1-1/2" copper tube or 1-1/4" galvanized pipe as a slip connection. GASKET DESIGN #2: Accepts 2" copper tube as a slip connection. The flange is threaded for 2" screw in pipe connections. Also used with the 2" CPVC adapters. #1 #2 CAST IRON HEADERS (ASME MODELS) Fig.# 8095.1 Fig.# 8097.1 INLET/OUTLET HEADER - ASME Flange Gasket Header Flange Fig.# 8093.1 INLET/OUTLET HEADER - POLYMER High-temperature CPVC header flanges and header flange nuts are provided. If there is any possibility of back-siphoning when the pump stops, it is suggested that a check valve (or valves) also be installed in the system. O-Ring Header Flange (CPVC) Header Flange Nut (CPVC) Fig.# 2002.1 Heater must be located so that any water leaks will not damage the structure of adjacent area. High temperature 2" plastic pipe (CPVC) may be threaded directly into the header flanges. This is not the same as the Schedule 80 PVC pipe which is also gray. PVC may be used immediately after the supplied CPVC adapters. Header Header Flange (Supplied) CPVC Connector (Supplied) Plumbing WARNING: NEVER install PVC directly into header flanges. Use the 2" CPVC adapter supplied loose with the heater. DO NOT use petroleum-based assembly fluids (such as petroleum jelly or lubricating oil). If assembly lube is required, use a silicon base such as AquaLube etc. There are two sets of flange gaskets supplied with your heater. Use the appropriate gaskets for all your heater connections. Discard unused set. UNITHERM GOVERNOR OPERATION CAUTION: The patented Unitherm Governor is a thermostatic mixing valve specifically designed to maintain constant heater internal temperature between 105° and 115°F despite continually changing flow rates from the filter and changing pool temperatures. This narrow range is needed to prevent damaging condensation on the burners which will occur if the heater runs for any length of time below 100°F. It is also needed to inhibit scale formation in the tubes by maintaining temperatures well below accelerated scaling temperatures. U.G. Plug (Polymer) Unitherm Governor Gasket Fig.# 2011 22 INTERNAL AUTOMATIC BYPASS VALVE In addition to the Unitherm Governor, a built-in automatic bypass valve is provided in the in/out header. While the Unitherm Governor responds to the changes in water temperature in the heater, the internal bypass valve automatically responds to changes in water pressure in the piping system. Proper amount of water flow is maintained through the heater under varying pressures dictated by the conditions of the pump and filter. Bypass Disc Fig.# 2003 Spring Bypass Body EXTERNAL AUXILIARY BYPASS VALVE (Where Required) An auxiliary bypass valve should be used when flow rates exceed 125 GPM. Usually a high-performance pump size larger than two horsepower will exceed this flow rate. This valve is required to complement the function of the automatic bypass valve, particularly when starting the heater in winter or early spring when the spa or pool temperature is below 50°F. It also serves to eliminate needless pressure drop through the heater and accompanying reduction in the flow rate to the spa jets, etc. To Pool/ From Pool/ Spa Spa From Heater To Heater AUXILIARY BYPASS VALVE PRESSURE RELIEF VALVE INSTALLATION To conform to local building codes, it may be necessary to install a pressure relief valve. A 3/4" pressure relief valve, having a capacity equal to the BTUH output of the model to be installed, is recommended for this heater. The maximum acceptable pressure relief valve setting is 125 psi. A 3/4" NPT connection is provided in the Polymer header for installation of a pressure relief valve. The valve shall be installed in a vertical position. Do not overtighten. Install pressure relief valve hand tight plus 1/2 turn. POLYMER HEADER (STANDARD MODELS) Pressure Relief Valve PRV Discharge Connection In/Out Header Fig. #2004 A 3/4" NPT connection is provided in the header forinstallation of a pressure relief valve. The valve shall be installed in a vertical position. CAST IRON HEADER (ASME MODELS) PRV (DO NOT USE GATE VALVE) Fig.# 81.50.0 AUXILIARY BYPASS VALVE ADJUSTMENT To set bypass: With clean filter, adjustment is made by feeling the inlet and outlet pipes at the heater. Outlet pipes should be slightly warmer than inlet and comfortable to the touch. If pipe is hot, close bypass; if cold, open bypass. NOTE: To avoid water damage or scalding due to valve operation, drain pipe must be connected to valve outlet and run to a safe place of discharge. Drain pipe must be the same size as the valve discharge connection ...

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