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

1 Service (continued)

D5: Freeze protection pump on

In order to prevent the water in the heater from freezing, the SMART SYSTEM control turns on the boiler pump whenever the inlet temperature goes below the minimum temperature. This temperature can be adjusted by using parameter D5. The range of this parameter is 32°F (0°C) to 104°F (40°C). The default value is 45°F (7°C).

D6: Freeze protection burner on

If the inlet temperature continues to drop after strating the pump (see Freeze Protection Pump On), and the inlet temperature goes below a second minimum temperature, the first stage will fire. This second temperature can be adjusted by using parameter D6. The temperature range of this parameter is 32°F (0°C) to 104°F (40°C. The default value is 37°F (3°C).

D7: Freeze protection differential

Once the pump has turned on, this parameter determines how much the inlet temperature must rise before the pump turns off. Similarly, once Stage 1 has turned on, this parameter also determines how much the inlet temperature must rise before Stage 1 turns back off. This temperature differential can be adjusted using parameter D7. The temperature range of this parameter is 0° to 72°F (40°C). The default temperature is 5°F (3°C).

E:DHW settings

E1: DHW tank set point

When a temperature sensor is installed in the DHW tank, the DHW tank set point sets the target temperature of the water in the tank. The user or installer can adjust this set point by accessing parameter E1. The temperature range of this parameter is 60°F (15°C) to 190°F (88°C). The default value is 120°F (49°C).

E2: DHW boiler set point (boiler only)

When an indirect DHW call for heat becomes active, the control will use the DHW boiler set point to determine the firing rate of the unit based on the actual outlet water temperature. This parameter can be changed by the installer by accessing parameter E2. The temperature range of this parameter is 32°F (0°C) to 261°F (127°C). The default value is 180°F (82°C).

E3: Minimum tank set point

The minimum allowable tank set point can be adjusted using parameter E3. The temperature range of this parameter is 60°F (16°C) to the value of parameter E4. The default value is 60°F

(16°C).

E4: Maximum tank set point

The maximum allowable tank set point can be adjusted using parameter E4. The temperature range of this parameter is 60°F (16°C) to the value of parameter E3 to 190°F (88°C). The default temperature is 190°F (88°C).

E5: SH/DHW switching time (boiler only)

When a SH call for heat and a DHW call for heat are present at the same time, the SMART SYSTEM control can switch back and forth between the two calls. The time that the control services the SH demand before switching to the DHW demand can be adjusted by using parameter E5. The range of this parameter is 0 to 240 minutes. Setting this parameter to 0 disables the switching function. The control will service the DHW demand until it ends, then return to the SH demand (if active). The default value of this parameter is 30 minutes.

E6: DHW/SH switching time (boiler only)

The time that the SMART SYSTEM control services a DHW demand before returning to the SH demand is set by parameter E6. The range of this parameter is 0 to 240 minutes. Setting this parameter to 0 disables the switching function. The default value of this parameter is 30 minutes.

E7: Tank offset (water heater only)

The tank offset is the number of degrees the DHW tank temperature must go above the tank set point before the water heater will turn off. To adjust this value, access parameter E7. The temperature range of this parameter is 0° to 10°F (5°C). The default value is 4°F (2°C).

E8: Tank differential

The tank differential is the number of degrees the DHW tank temperature must go below the tank set point before the heater or boiler will start to heat the DHW tank. To adjust this value, access parameter E8. The temperature range of this parameter is 0° to 40°F (22°C). The default value is 6°F (3°C).

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Lochinvar 502 - 2072, 402 - 2072 service manual DHW settings
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502 - 2072, 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.

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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.
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