Weil-McLain CGA25SPDN manual SYSTEM-bypass piping method

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GOLD CGa Gas-Fired Water Boiler — Boiler Manual

3d Piping — low temperature systems (continued)

SYSTEM-bypass piping method

This piping method (&IGURE , page 25) is called a SYS TEMBYPASS because part of the circulator flow bypasses the system (through valve A). This bypassed hot water from the boiler outlet mixes with cooler system return water temperature in order to provide minimum 130°F RETURN WATERTTO THEHBOILERL6ALVELB 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 A.

&IGURE  is an alternative piping method that provides return water temperature control for boilers installed on CONVERTEDEGRAVITY SYSTEMS (large water content or steam systems).

$/ ./4 apply the piping of &IGURE  on RADIANTI HEATINGTSYSTEMS. It provides no method of regulat- ing the water temperature provided to the system and could result in excessive water temperature in the radi- ant tubing.

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

$/ ./4 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.

Valve adjustment

1. Start with valve A fully closed and B fully open.

 'RADUALLYUOPEN VALVELA while closing valve B until the temperature at gauge  reads at least 130°F at all times.

 6ALVELA regulates the amount of boiler supply water MIXEDXWITH RETURN WATER 6ALVELB causes a pressure drop in the system needed to balance flow through valve A 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 LOWWRETURN WATERTTEMPERATURE 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 THEHBOILER RETURN WATERTTEMPERATURE and the SYSTEM SUPPLYYTEMPERATURE (such as provided by an INJEC

TION PUMPING CONTROL).

"OILER RETURN WATERTTEMPERATUREAWILL BE ADEQUATELY CONTROLLEDEUSINGITHEGMETHODSESHOWNE in this manual provided the SYSTEM SUPPLYYTEMPERATURE is RELATIVELYYCONSTANT

DO NOT apply the methods of this manual if the system is equipped with an OUTDOORD

RESETSCONTROL Instead, PROVIDE CONTROLSLAND PIPING which can REGULATE THE BOILERTRE

TURN WATERTTEMPERATURE at NO LESS THAN —& regardless of system supply temperature.

#ONTACTTYOUR 7EIL-C,AIN REPRESENTATIVECFORASUGGESTEDEPIPING ANDDCONTROLNMETHODS

Failure to PREVENT COLD RETURN WATERTTEMPERATURE 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 550-101-009/0107

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Contents Gold CGa How it works Other boiler componentsGold CGa Gas-Fired Water Boiler Contents Installer Please read before proceedingUser 1a Prepare boiler location codes & checklist Installations must follow these codesBefore locating the boiler, check the following Ss .ATIONAL %LECTRICAL%#ODEResidential garage installations Minimum dimensions are v Length by1b Prepare boiler location clearances FoundationWhen removing boiler from an existing common vent system 1c Prepare boiler location vent systemChimney or vent require- ments Line chimney with corrosion-resistant metal1d Prepare boiler location air contamination Products to avoidTHEHBOILER #HECKETHEHBOILER Placementecompared 1e Prepare boiler location air openingsAir openings must be provided To a,Exhaust fans and air movers Motorized air dampersSingle air opening option Exception for large spaces2a Prepare boiler placement and setup Orifice replacement procedurePlace boiler/crate near position Inspect orifices and burners2b Prepare boiler pressure test Hydrostatic pressure testDrain and remove fittings Prepare boiler for testPrepare boiler draft hood & spill switch Prepare boiler install vent pipingDraft hood installation Spill switch installation2e Prepare boiler vent damper installation InstallationDamper blade Minimum clearances3a Water piping general information 3b Water piping single-zone system Diaphragm-type or bladder- type expansion tank FigureClosed-type expansion tank 3c Water piping multiple zones Piping multiple zones3c Water piping multiple zones 3d Piping low temperature systems Temperature gaugesValve adjustment Figures 13 and 14 only Primary/secondary preferred Bypass piping methodLendetemperaturemgauge Oiler Isolation BALANCING ValvesONE Valve $RAINAVALVE Valve adjustment BOILER-bypass piping method13 !IRISEPARATORRANDNAUTOMATICMVENT NIF Used .OTEOTHAT Theh SYSTEM-bypass piping method Gold CGa Gas-Fired Water Boiler Boiler Manual Gas piping Connect gas supply piping to boilerNatural Gas Propane GasField wiring Installation must comply withWiring connections Ational %LECTRICAL #ODE !.3.&0! LATESTA EDI- tionFreeze protection when used 6a Start-up preparationCheck for gas leaks Determine if water treatment is needed Verify water chemistryFill the system with water Inspect system water pipingInspect base insulation  #LOSEOZONE Isolation VALVES6b Start-up operate boiler Efore STARTINGSTHEABOILER NDO the FOLLOWINGSs 6ERIFY the Boilerhand System are Full Oflwater 6c Start-up if boiler doesn’t start Start the boilerCheck system and boiler Check for6d Start-up verify operation Check burner flamesCheck vent damper operation Check vent system operationCheck-out procedure checklist OO Utton Onospilloswitch PUSHEDLINOO !IRIPURGED FROMGSYSTEM  #ALCULATEUGASAINPUT8a Operation standing pilot boilers Main ignited until thermostat circuit or limit circuit8b Lighting instructions CGa-25 to CGa-8 8b Lighting instructions CGa-25 to CGa-8 9a Operation spark-ignited pilot boilers GAS mOWSSTO Pilot or Main GAS VALVE#ALL for HEATHthermostat circuit closes Damper is de-energized, and cycles to closed posiSchematic wiring diagram Spark-ignited pilot system 9a Operation spark-ignited pilot systemLadder wiring diagram Spark-ignited pilot system 9b Operating instructions CGa-25 to CGa-8 9b Operating instructions CGa-25 to CGa-6 9b Operating instructions CGa-25 to CGa-6 9b Operating instructions CGa-7 to CGa-8 10a Service and maintenance schedule Service technicianOwner maintenance 10b Service & maintenance annual start-up Boiler heating surfaces Oiled-bearing circulatorsRepair.URNERSNANDRBASE Gas piping Cold fill and operating pressuresAir vents and air elimination Limit controls and cutoffsSafety relief valves should be Following installation, the valveReview with owner Boiler relief valve11a Troubleshooting procedure Before troubleshooting #ONTINUITY CHECKER Check the following Event of vent damper failureEffikal or Field Controls damper  ASAPRESSURES11b Troubleshooting standing pilot boilers Chart 1 Standing pilot Boiler will not fire11c Troubleshooting spark-pilot boilers Control indicator lights Lockout modesControl indicator lights NON-LOCKOUT modes Troubleshooting the control module11c Troubleshooting spark-pilot boilers Tstat Circ Usually indicates 48 VAC on thermostat circuit stray voltage Chart 4 Spark-ignited pilot Damper light flashing Chart 5 Spark-ignited pilot Flame & Power lights flashing Item 8 , Verify Sequence 12a Replacement parts Section assembly Base Jacket Trim Controls12b Replacement parts section assembly Part number12c Replacement parts base Igure R Base assembly, manifold, orifices and burners12d Replacement parts jacket Igure R Jacket assembly12e Replacement parts trim Igure R Trim assembly12f Replacement parts controls Igure R Gas control assembly13a Dimensions 13b Ratings DOEHandling ceramic fiber and fiberglass materials Jobosite CONDITIONS #URRENT ./3 RecommenREATHING H&RESHGAIR Ss 5SES E./3 .CERTIlED Dust Crespirator E. 

CGA25SPDN specifications

The Weil-McLain CGA25SPDN is a high-efficiency gas-fired boiler designed to deliver dependable heating performance while maintaining a strong focus on energy savings and user-friendly operation. Ideal for residential applications, this boiler is engineered to provide consistent warmth and comfort in homes with various heating demands.

One of the main features of the CGA25SPDN is its durable construction. Built with high-quality materials, this boiler is designed to withstand the rigors of frequent operation while maximizing longevity. It features an advanced cast iron heat exchanger that efficiently transfers heat to the water, resulting in lower energy costs and improved overall performance.

Efficiency is a key characteristic of the Weil-McLain CGA25SPDN. Its design promotes efficient combustion, allowing for a higher Annual Fuel Utilization Efficiency (AFUE) rating. With an AFUE rating of up to 82%, this boiler ensures that more of the fuel used is converted into usable heat, which translates to reduced energy bills for homeowners.

The boiler exhibits a user-friendly control system that allows for easy operation and maintenance. It comes equipped with an integrated vent damper that maximizes efficiency by reducing heat loss during standby periods. Additionally, the CGA25SPDN features an adjustable thermostat, enabling homeowners to customize their heating preferences easily.

Another significant feature of the CGA25SPDN is its versatility. The boiler is compatible with various heating applications, including hot water heating systems and home heating configurations. This adaptability makes it a great choice for both new installations and retrofitting existing systems.

Safety is always a concern with gas-fired appliances, and the Weil-McLain CGA25SPDN addresses this through its advanced safety mechanisms. The boiler incorporates safety controls that prevent overheating and ensure proper operation, providing peace of mind to homeowners.

In summary, the Weil-McLain CGA25SPDN stands out as a reliable and efficient heating solution for residential settings. With its durable construction, high-efficiency performance, user-friendly controls, and impressive safety features, it is an exceptional choice for those seeking a dependable gas-fired boiler that meets modern heating demands while keeping energy costs in check. Homeowners can trust the Weil-McLain CGA25SPDN for warmth and comfort through the cold months.
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