Laars Mascot II Installation And Operation Instructions Manual

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Laars Mascot II Installation And Operation Instructions Manual Manual pdf 17 page image

Mascot II Boilers and Water Heaters Page 17SECTION 5.Pump Capacity5.1 Mascot II Heating SystemPump Capacity (see Figure 11)HEATING DHWSIZE CONN SIZE CONN SIZE125 3/4" 1/2"Table 7. Water Connection Pipe Sizes.SECTION 6.Water Connections6.1 Central Heat System PipingNOTE: This appliance must be installed in a closedpressure system with a minimum of 12 psi (82.7kPa)static pressure at the boiler.Hot water piping should be supported by suitablehangers or floor stands. Do not support piping with thisappliance. Due to expansion and contraction of copperpipe, consideration should be given to the type ofhangers used. Rigid hangers may transmit noise throughthe system resulting from the piping sliding in thehangers. It is recommended that padding be used whenrigid hangers are installed. Maintain 1" (2.5cm)clearance to combustibles for hot water pipes.Pipe the discharge of the relief valve (full size) toa drain or in a manner to prevent injury in the event ofpressure relief. If system contains more than 24 gallons(91 liters), then an auxiliary expansion tank is required.Minimum fill pressure must be 12psig (82.7kPa). Installshutoff valves where required by code.Suggested piping diagrams are shown in Figures12 through 19. These diagrams are meant only as aguide. Components required by local codes must beproperly installed.Mascot II's efficiency is higher with lowerreturn water temperatures.Mascot II MUST be piped in a primary-secondaryfashion (using either piping or a hydraulic separator)such that the pump that is mounted on the boiler ONLYserves the boiler.Mascot II boiler must be located within 15 feet(4.6m) of the supply and return header (or the hydraulicseparator). The pump is sized for a maximum of 30 feet(9.1m) of piping and the headloss of the boiler only (seeFigure 11).For custom configurations, the available pumphead is provided in Figure 18. The system designershould take into account allowable boiler temperaturerise of 65°F (36°C).6.2 Cold Water Make-Up1. Connect the cold water supply to the inletconnection of an automatic fill valve.2. Install a suitable back flow preventer between theautomatic fill valve and the cold water supply.3. Install shut off valves where required.The boiler piping system of a hot water heatingboiler connected to heating coils located in air handlingappliances where they may be exposed to refrigeratedFigure 11. Available Pump Head.Figure 12. DHW Connections with Anti-Scald Valve andFlow Restrictor.