Weil-McLain 550-110-260/02002 manual 3f Water piping low temp systems

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GOLD CGs Gas-Fired Water Boiler

3f Water piping — low temp systems

System-bypass piping method

Valve adjustment

This piping method is called a system-bypassbecause part of the circulator flow bypasses the system (through valve 7a). This bypassed hot water from the boiler outlet mixes with cooler system return water temperature in order to provide minimum 130 °F return water to the boiler. Valve 7b will most often be full open, but may need to be slightly closed on some low pressure drop systems in order to cause enough flow through valve 7a.

Figure 12 is an alternative piping method that provides return water temperature control for boilers installed on converted gravity systems (large water content or steam systems).

Do not apply the piping of Figure 12 on radiant heating systems. It provides no method regulating the water temperature provided to the system and could result in excessive water temperature in the radiant tubing.

System-bypass piping as shown in Figure 12 can be used with either zone valve or circulator zoning. When used with circulator zoning however, the boiler circulator (item 3), must be piped as shown. It cannot be used as one of the zoning circulators.

Do not apply system-bypass piping if the reduced flow in the system could cause poor heat distribution. That is, system-bypass piping reduces the flow in the system and increases the water temperature supplied to the system. This can cause increased heat from radiators at the beginning of the system and reduced heat from radiators near the end of the system.

1.Start with valve 7a fully closed and 7b fully open.

2.Gradually open valve 7a while closing valve 7b until the temperature at gauge 8 reads at least 130 °F at all times.

3.Valve 7a regulates the amount of boiler supply water mixed with return water. Valve 7b causes a pressure drop in the system needed to balance flow through valve 7a and the system.

4.The valve adjustment should be done with the system at the coldest expected temperature (60 °F for converted gravity systems or high mass radiant systems).

Failure to prevent low return water temperature to the boiler could cause corrosion of the boiler sections or burners, resulting in severe personal injury, death or substantial property damage.

Radiant heating system piping should include a means of regulating the boiler return water temperature and the system supply temperature (such as provided by an injection pumping control).

Boiler return water temperature will be adequately controlled using the methods shown in this manual provided the system supply temperature is relatively constant.

DO NOT apply the methods of this manual if the system is equipped with an outdoor reset control. Instead, provide controls and piping which can regulate the boiler return water temperature at no less than 130 °F regardless of system supply temperature. Contact your Weil-McLain representative for suggested piping and control methods.

Failure to prevent cold return water temperature to the boiler could cause corrosion damage to the sections or burners, resulting in possible severe personal injury, death or substantial property damage.

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Part number 550-110-260/0200

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Contents Page How it works ① Control modulePage Contents Please read before proceeding InstallerUser 1a Prepare boiler location codes & checklist 1b Prepare boiler location clearances Residential garage installationFlooring and foundation 1c Prepare boiler location vent system Removing from existing vent1d Prepare boiler location contamination Air contamination1e Prepare boiler location air openings CGs combustion air optionsSizing air openings for CGs installations Place boiler/crate near position 2a Prepare boiler placement & setupOrifice replacement procedure Inspect orifices and burnersPrepare boiler for test 2b Prepare boiler pressure testPerform hydrostatic pressure test Fill and pressure test3a Water piping general information Diaphragm-type or bladder-type expansion tank Figure 3b Water piping single-zone systemExpansion tank Closed-type expansion tank Figure3c Water piping multiple zones Converted gravity or steam systemsTypical piping multiple-zone installations Temperature gauges Valve adjustment 3d Water piping low temp systemsPrimary/secondary preferred bypass piping For radiant heating or converted gravity systems3e Water piping low temp systems Boiler-bypass alternate piping 3f Water piping low temp systems 3g Water piping refrigeration system 3f system-bypass alternate pipingPrevent chilled water from entering boiler Venting and combustion air Connecting gas supply piping to boilerGas piping Natural Gas LengthThermostat Field wiringWiring connections Junction Box furnishedDetermine if water treatment is needed Freeze protection when used7a Start-up preparation Check for gas leaks7a Start-up preparation 7b Start-up operate boilerCheck burner flames 7c Start-up if boiler doesn’t startCheck for Check-out procedure checklist Installation and service certificate9a Operation sequence Raise room thermostat to call for heat9b Operation wiring diagrams Schematic wiring diagramService For Your Safety Read Before Operating 9c Operation lighting instructions10a Service and maintenance schedule Service technician10b Service & maintenance annual start-up Condensate drain system Burners, base and inlet air boxBoiler heating surfaces Inducer motor10b Service & maint. annual start-up Boiler relief valve Lever must be operated AT LeastReview with owner 11a Troubleshooting procedure Before troubleshooting11b Troubleshooting air pressure switch Check pressure switch setting11c Troubleshooting control module Control indicator lights lockout modesControl module connections 11d Troubleshooting control module lights Chart 1 Troubleshooting Power light statusChart 2 Tstat Circ & Power lights flashing Chart 3 Press Switch & Power lights flashing Chart 4 Flame & Power lights flashing Turn OFF Power to boiler at service switch or breaker Does blower motor operate? Verify Sequence of operation, , 12a Replacement parts Page Page Page Page Page 13a Dimensions Dimensional drawing13b Ratings DOEHandling ceramic fiber and fiberglass materials Removal of Combustion Chamber Lining or Base Panels

550-110-260/02002 specifications

Weil-McLain is a well-known manufacturer of high-quality heating systems and boiler solutions, and the 550-110-260/02002 model is a testament to the company's commitment to innovation and performance. This particular boiler is designed for commercial and residential applications, providing exceptional heating efficiency and reliability.

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Another important characteristic of the Weil-McLain 550-110-260/02002 is its adaptability. It can be configured to work with various types of fuel including natural gas and propane, giving users the flexibility to choose the most cost-effective energy source. This versatility also helps to extend the lifespan of the boiler as it can be easily adapted to changing energy needs.

In conclusion, the Weil-McLain 550-110-260/02002 is a high-performance boiler that combines durability, efficiency, and advanced technology. With its robust construction, efficient burner system, and user-friendly controls, it stands out as a reliable heating solution for both commercial and residential applications. The commitment to quality and innovation makes this model a preferred choice for those seeking dependable heating systems. Whether for new installations or replacements, the Weil-McLain 550-110-260/02002 delivers exceptional performance and value.
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