How the boiler works, ① Control module

GOLD CGs — User’s Information Manual

How the boiler works . . .

①Control module

The control module responds to signals from the room thermostat, air pressure switch and boiler limit circuit to operate the boiler circulator, pilot burner, gas valve and inducer. When room thermostat calls for heat, the control module starts the system circulator and inducer.

The control module runs the inducer long enough to purge the boiler flue passages, then opens the pilot valve and activates pilot ignition spark.

The control module allows up to 15 seconds to establish pilot flame. If flame is not sensed within 15 seconds, the control module will turn off the gas valve, flash the Flame light, and then enter a 15-second postpurge. The control module will then start a new cycle. This will continue indefinitely until pilot flame is established or power is interrupted. Once pilot flame is proven, the control module opens the gas valve to allow main burner flame.

When the room thermostat is satisfied, the control module turns off the gas valve, operates the inducer for a 15-second postpurge and waits for the next heat call.

The control module indicator lights show normal sequence when the lights are on steady. When a problem occurs, the control module flashes combinations of lights to indicate the most likely reason for the problem.

②

③

Transformer

The control transformer reduces line voltage to 24 volts for the gas valve and limit circuit.

Inducer

The inducer pulls flue gases through the boiler, causing air to be pulled in through the air intake opening. The inducer pushes the flue gases through the vent pipe as well.

④Air pressure switch

The air pressure switch signals the control module, telling the control module whether air is moving through the inducer.

⑤Water temperature limit switch

The water temperature limit switch turns off the gas valve if the temperature in the boiler goes above its setting. (The circulator will continue to run as long as there is a call for heat.)

⑥Boiler circulator

The boiler circulator circulates water through the external (system) piping. NOTE — The control module provides a pump exercising routine. If the boiler is not operated for 30 days, the control module will power the circulator for 30 seconds, then off.

Other boiler components:

a	supply to system	f	pressure/temperature gauge	k	pilot burner and bracket
b	return from system	g	relief valve (not visible)	l	stainless steel burners
c	combustion air inlet	h	air vent connection	m cast iron boiler sections
d	flue outlet	i	flame rollout switch	n	flue collector
e	gas valve	j	air inlet box	o	junction box

10	Part No. 550-110-261/0999

GOLD CGs specifications

Weil-McLain has established itself as a leader in the heating industry, and the GOLD CG series is a testament to its commitment to innovation, efficiency, and performance. The GOLD CG is a high-efficiency gas boiler designed for both residential and commercial applications. With its robust construction and intelligent engineering, it provides reliable heating while minimizing fuel consumption.

One of the standout features of the GOLD CG series is its advanced cast iron heat exchanger. This allows for excellent heat retention and optimal efficiency, ensuring that the boiler operates at a high performance level while consuming less energy. The cast iron design not only promotes longevity but also helps in maintaining consistent heating throughout the space.

Another key characteristic of the GOLD CG series is its modulating gas burner. This technology enables the boiler to adjust its output in response to the current heating demands, resulting in improved efficiency and significant energy savings. This modulation reduces short cycling, which can lead to increased wear and tear on the system over time.

The GOLD CG boilers are equipped with a user-friendly control interface, allowing homeowners and property managers to easily monitor and adjust settings. The integrated control system features advanced diagnostics that simplify troubleshooting and maintenance, making it easy to keep the system running smoothly.

Moreover, the GOLD CG series supports a wide range of installation options, including natural gas or propane configurations. This adaptability ensures that it can meet various heating needs, whether in smaller residential settings or larger commercial environments. Additionally, the compact design allows for easy placement in tight spaces, making it a versatile choice for numerous applications.

Environmental considerations are also at the forefront of the GOLD CG series. The boilers are designed to operate efficiently, which helps reduce greenhouse gas emissions. With high Annual Fuel Utilization Efficiency (AFUE) ratings, these boilers meet or exceed most energy efficiency standards, contributing to a more sustainable heating solution.

In summary, the Weil-McLain GOLD CG series stands out for its combination of efficiency, advanced technology, and thoughtful design. With features like a durable cast iron heat exchanger, modulating gas burner technology, and user-friendly controls, it provides reliable heating for a variety of applications while promoting energy conservation and sustainability. Whether for residential or commercial use, the GOLD CG series represents a top-tier choice for modern heating needs.