Troubleshooting, Check control module fuses

Copper-fin II/IIE Boiler and Water Heater Service Manual

3 Troubleshooting

WARNING

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Always disconnect power to the appliance before servicing. Failure to comply could result in severe personal injury, death, or substantial property damage.

Check control module fuses

	NOTICE	ALWAYS check control module fuses before
	NOTICE	replacing control module or any major
		replacing control module or any major
		components (blower, etc.). If one of these
		fuses is blown, it can prevent the control
		module or other components from operating.

Never jumper (bypass) any device except WARNING for momentary testing as outlined in the

Troubleshooting chart. Severe personal injury, death, or substantial property damage can result.

Before troubleshooting:

1.	Have the following items:
	a.	Voltmeter that can check 120 VAC, 24 VAC, and
		12 VDC.
	b.	Continuity checker.
	c.	Contact thermometer.
2.	Check for 120 VAC (minimum 102 VAC to maximum

1.Turn OFF the power to the appliance at the external line switch.

2.Remove front access cover.

3.Inspect fuses F2, F4, F5, and F6, see FIG. 3-1 below.

Figure 3-1_Control Module Fuses

5 AMPS

	132 VAC) to appliance.
3.	Make sure thermostat is calling for heat and contacts
	(including appropriate zone controls) are closed. Check for
	24 VAC between thermostat wire nuts and ground.
4.	Make sure all external limit controls are installed and
	operating.

Check the following:

5 AMPS

3.15 AMPS

5 AMPS

1.Wire connectors to control module are securely plugged in at the module and originating control.

2.Gas pressures:

Refer to the Gas Connections Section of the Installation and Operation Manual for detailed information concerning the gas supply.

4.The appliance is shipped with four (4) spare fuses in a plastic bag attached to the control panel.

5.If necessary, replace open fuse (F2 is 3.15 amps and F4, F5, and F6 are 5 amps).

Note: Fuses F2 - F6 are all slow blow fuses.

WARNING

Do not jumper fuse or replace with any fuse except as specified. Failure to comply could result in severe personal injury, death, or substantial property damage.

6.Install front access cover after fuse inspection.

7.Restore power to the appliance at the external line switch and verify boiler/water heater operation (Start-up Section in the Installation and Operation Manual) after completing boiler/water heater service.

402 - 2072 specifications

The Lochinvar 402 - 2072 is a versatile and highly efficient boiler designed to meet the heating demands of modern residential and commercial applications. This model stands out due to its innovative technologies, advanced features, and a high level of reliability, making it an ideal choice for consumers looking for an enduring and economical heating solution.

One of the primary characteristics of the Lochinvar 402 - 2072 is its impressive energy efficiency. With an exceptional annual fuel utilization efficiency (AFUE) rating, this boiler ensures minimal energy waste, allowing homeowners and business operators to save significantly on their energy bills. The model incorporates advanced condensing technology that enables it to extract heat from the combustion gases, maximizing heat transfer and reducing emissions.

The Lochinvar 402 - 2072 is built with a robust stainless steel construction that enhances durability and resilience against corrosion and other environmental factors. This material not only prolongs the lifespan of the unit but also contributes to its outstanding thermal efficiency. Additionally, the boiler's compact design allows for flexible installation options, making it suitable for various spaces, including tight utility rooms and basements.

Equipped with a user-friendly control interface, the Lochinvar 402 - 2072 allows for easy monitoring and adjustment of settings. Its advanced digital display provides real-time data on system performance, ensuring the operator can maintain optimal performance and efficiency.

Another noteworthy feature is the unit's quiet operation. The design includes sound-dampening insulation and high-efficiency circulators, keeping noise to a minimum, which is an essential trait for both residential and commercial settings.

The Lochinvar 402 - 2072 is also designed with safety in mind. It incorporates multiple safety features including an automated vent damper, low water cutoff, and a comprehensive control system that monitors various operating conditions. This proactive approach to safety ensures that potential issues are identified and addressed before they become critical.

In conclusion, the Lochinvar 402 - 2072 boiler presents an exceptional combination of efficiency, durability, and user-friendly features. Its advanced condensing technology, stainless steel construction, and focus on safety make it a leading choice in the competitive boiler market, catering to the heating needs of a diverse range of applications while ensuring environmental responsibility. For those in search of a dependable and efficient heating solution, the Lochinvar 402 - 2072 is certainly worth considering.