GOLD CGa Gas-Fired Water Boiler — Boiler Manual

11c Troubleshooting — spark-pilot boilers (continued)

CHART 3 — Spark-ignited pilot — TSTAT CIRC & POWER lights flashing

— Usually indicates 48 VAC on thermostat circuit (stray voltage) —

 

Electrical shock hazard — Wherever you see

TURN OFF POWER , follow the instructions. Failure to follow

 

instructions could result in severe personal injury, death or substantial property damage.

 

 

 

 

 

 

 

 

• Disconnect the two external wires connected to the boiler

• If a voltage does occur under any condition, check and

thermostat leads (two black low voltage leads in J-box).

 

correct the external wiring. (This is a common problem

• Connect a voltmeter across these two incoming wires.

 

when using 3-wire zone valves.)

• Once the external thermostat circuit wiring is checked and

Close each thermostat, zone valve and relay in the external

circuit one at a time and check the voltmeter reading

 

corrected if necessary, reconnect the external thermostat

across the wires.

 

circuit wires to the boiler thermostat wires and allow the

• There should NEVER be a voltage reading.

 

boiler to cycle.

 

 

 

 

Did you find a voltage across the two external thermostat circuit wires?

 

 

 

 

 

 

 

 

Yes

 

 

No

 

 

 

 

 

 

 

•Leave external boiler thermostat connection wires disconnected from boiler.

•Troubleshoot the external thermostat circuit until you find the source of the stray voltage. (Pay close attention to the wiring connections to 3-wire zone valves.)

•Correct the problem and repeat the voltmeter test above, verifying there is no longer a voltage reading under any condition in the external thermostat circuit.

•If no voltage is found under any condition of the external thermostat circuit, connect the two boiler thermostat connection leads together (or jumper the boiler aquastat T-T terminals).

• Turn off power to the boiler for 1 minute.

• Turn on power and allow boiler to cycle.

Do the TSTAT and POWER lights still flash?

No

 

Yes

 

 

 

 

•Boiler should now operate per the normal sequence of operation shown in Figure 24, page 37.

•Replace control module.

•Retest.

Part Number 550-101-009/0107

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Weil-McLain CGA25SPDN manual Usually indicates 48 VAC on thermostat circuit stray voltage
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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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