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