Weil-McLain CGA25SPDN manual 3c Water piping multiple zones, Piping multiple zones

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GOLD CGa Gas-Fired Water Boiler — Boiler Manual

3c Water piping — multiple zones

Piping multiple zones

Follow instructions on pages 16 and 17 to install near- boiler or single-zone piping. (Also refer to 0IPING FOR

RADIANTIHEATINGTSYSTEMSTOR CONVERTEDEGRAVITY SYS

TEMS below, if applicable.)

See &IGURE  or &IGURE  PAGE  TO COMPLETE IN- stallation.

Zoning with circulators (Figure 11) (return temp over 130°F)

1.Size each circulator to individual circuit require- ments.

 $O NOTOINSTALLTCIRCULATOR ON BOILER EXCEPTCFOROPRI- mary/secondary piping).

3.Install isolation (balancing) valves to adjust flow to distribute heat to all zones.

4.Install and wire a separate relay for each zone cir- culator.

Zoning with zone valves (Figure 12) (return temp over 130°F)

1.Install isolation (balancing) valves to adjust flow to distribute heat to all zones.

2.Provide a separate 24-volt transformer to power the zone valves. Size the transformer to handle the total rated load of all connected zone valves.

Piping for radiant heating systems or converted gravity systems

Converted gravity (or steam) systems

Whenever possible, use the primary/secondary piping shown in &IGURESU or  on page 21. This piping de- sign allows changing boiler flow rate without affecting primary circuit flow rate.

If &IGURESU or  cannot be used, use the boiler-bypass piping shown in &IGURE  or &IGURE  ON PAGE 9OU can also use the piping shown in &IGURE  on page 25 (system-bypass), if the reduced flow rate in the heating system will not cause heat distribution problems.

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

Radiant heating systems

Preferably, use primary/secondary piping, as shown in &IGURESU or  on page 21. Alternatively, use the method of either &IGURE  or &IGURE  on page 23. $O NOTOUSESTHEHPIPING OF &IGURE  (system-bypass), because this method does not control radiant system supply temperature.

If radiant system tubing has no oxygen barrier, a HEAT EXCHANGER must be used.

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 R"OILER RETURN WATERTTEMPERATURERWILL BE ADEQUATELY CONTROLLED USINGITHEHMETHODSH shown in this manual provided the system supply temperature is relatively constant.

$/ ./4 apply the methods in this manual if the system is equipped with an OUTDOORDRESETS CONTROL. Instead, provide controls and piping which can regulate the boiler return water

TEMPERATURERAT NO LESS THAN —&REGARDLESS OF SYSTEM SUPPLY TEMPERATUREA#ONTACTTYOUR 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 dam- age.

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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 Before locating the boiler, check the following 1a Prepare boiler location codes & checklistInstallations must follow these codes Ss .ATIONAL %LECTRICAL%#ODE1b Prepare boiler location clearances Residential garage installationsMinimum dimensions are v Length by FoundationChimney or vent require- ments When removing boiler from an existing common vent system1c Prepare boiler location vent system Line chimney with corrosion-resistant metal1d Prepare boiler location air contamination Products to avoidAir openings must be provided THEHBOILER #HECKETHEHBOILER Placementecompared1e Prepare boiler location air openings To a,Single air opening option Exhaust fans and air moversMotorized air dampers Exception for large spacesPlace boiler/crate near position 2a Prepare boiler placement and setupOrifice replacement procedure Inspect orifices and burnersDrain and remove fittings 2b Prepare boiler pressure testHydrostatic pressure test Prepare boiler for testDraft hood installation Prepare boiler draft hood & spill switchPrepare boiler install vent piping Spill switch installationDamper blade 2e Prepare boiler vent damper installationInstallation 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 Valve adjustment Figures 13 and 14 only 3d Piping low temperature systemsTemperature gauges 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 Natural Gas Gas pipingConnect gas supply piping to boiler Propane GasWiring connections Field wiringInstallation must comply with Ational %LECTRICAL #ODE !.3.&0! LATESTA EDI- tionCheck for gas leaks Determine if water treatment is needed Freeze protection when used6a Start-up preparation Verify water chemistryInspect base insulation Fill the system with waterInspect system water piping  #LOSEOZONE Isolation VALVES6b Start-up operate boiler Efore STARTINGSTHEABOILER NDO the FOLLOWINGSs 6ERIFY the Boilerhand System are Full Oflwater Check system and boiler 6c Start-up if boiler doesn’t startStart the boiler Check forCheck vent damper operation 6d Start-up verify operationCheck burner flames Check vent system operationOO !IRIPURGED FROMGSYSTEM Check-out procedure checklistOO Utton Onospilloswitch PUSHEDLIN  #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 #ALL for HEATHthermostat circuit closes 9a Operation spark-ignited pilot boilersGAS mOWSSTO Pilot or Main GAS VALVE 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 Air vents and air elimination Gas pipingCold fill and operating pressures Limit controls and cutoffsReview with owner Safety relief valves should beFollowing installation, the valve Boiler relief valve11a Troubleshooting procedure Before troubleshooting #ONTINUITY CHECKER Effikal or Field Controls damper Check the followingEvent of vent damper failure  ASAPRESSURES11b Troubleshooting standing pilot boilers Chart 1 Standing pilot Boiler will not fireControl indicator lights NON-LOCKOUT modes 11c Troubleshooting spark-pilot boilersControl indicator lights 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 DOEREATHING H&RESHGAIR Handling ceramic fiber and fiberglass materialsJobosite CONDITIONS #URRENT ./3 Recommen 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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