Lochinvar 402 - 2072, 502 - 2072 service manual Outdoor air reset boiler only

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

1 Service

Figure 1-1_Outdoor Air Reset Curve

F:Outdoor air reset (boiler only)

Outdoor air reset operation

When the outdoor air sensor is installed, the control will calculate the water temperature set point based on the outdoor air temperature. As the outdoor air temperature drops, the water temperature set point increases. This feature allows the unit to be more efficient in periods of mild weather, see FIG. 1-1 on page 17.

F1: Minimum air temperature

When the outdoor air temperature drops to this point, the water temperature will be at its maximum setting (FIG. 1-1). The set point will continue to increase as the outdoor temperature drops below this setting. The water temperature will be limited by the user set point. This parameter can be changed by the installer by accessing parameter F1. The temperature range of this parameter is -22°F (-30°C) to 86°F (30°C). The default value is 25°F (-4°C).

F2: Maximum air temperature

When the outdoor air temperature rises to or above this point, the water temperature will be at its minimum setting (FIG. 1-1). This parameter can be changed by the installer by accessing parameter F2. The temperature range of this parameter is -22°F (-30°C) to 86°F (30°C). The default value is 70°F (21°C).

F3: Maximum SH set point

When the outdoor temperature drops to its minimum setting (F1) the water temperature set point will be at this value, if the SH set point is set higher (FIG. 1-1). This parameter can be changed by the installer by accessing parameter F3. The temperature range of this parameter is 32°F (0°C) to 248°F (120°C). The default value is 180°F (82°C).

F4: Minimum SH set point

When the outdoor temperature rises to or above its maximum setting (F2) the water temperature will be at this value (FIG. 1-1). This parameter can be changed by the installer by accessing parameter F4. The temperature range of this parameter is 32°F (0°C) to 248°F (120°C). The default value is 70°F (21°C).

F5: Outdoor air shutdown

When the outdoor temperature rises above this point, the control will block all SH demands (DHW demands will still be active). This parameter can be changed by the user or the installer by accessing parameter F5. The temperature range of this parameter is 32°F (0°C) to 122°F (50°C). The default value is 80°F (27°C).

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Contents Copper-fin II/IIE Boiler, Water Heater Pool Heater Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid Maintenance What is in this manual?Service TroubleshootingService Copper-fin displayControl inputs Control outputs How the control module operates General OperationHow the appliance operates Sequence of operationSequence of operation OUT 123.8F129HTR Postpurge Display panel menu access Display panel parameter access Datalogging Functions Settingsdhw Resetoutdoor Parameter tableAnti-cycle Delay Yes Temperature settings boiler only Viewable and changeable control parametersData logging FunctionsDHW settings Outdoor air reset boiler only Anti-cycling Control modes Building Management System BMS CascadeService Notification Circulation pumpsOwner maintenance Maintenance Maintenance and annual startupService technician See the User’s Information Manual for instructionsMaintenance Check relief valve Inspect/replace hot surface igniter Inspect/replace hot surface ignitersInspect and clean burner Check all wiringCheck control settings Perform start-up and checksAccess to the burner will require the following steps Checking combustion air pressureAdjusting combustion air pressure Checking manifold gas pressureValve Fitting Control Knob Inspect and clean the heat exchanger Review with ownerOiled bearing circulators Check control module fuses TroubleshootingBefore troubleshooting Check the followingOperation No DisplayNo Burner Unit Does NotChecking temperature sensors Resistance TemperatureTemperature Resistance Boiler Pump System Pump NoisyNo Pump DHW PumpFlow Switch Flame SequenceAnti-cycling HSI Current Low ErrorNo Flame Ign Flame CKTRunning Auto ResetNo Flame High LimitSensor Open Manual ResetInlet Low Sensor ShortedAPS Open Louver ProvingTank Open APS ClosedTemp O/Shoot Rem Ctrl FltProgr Service BlkParameters Low VoltageWrite EEProm Watch Dog ErrorNo Error Stored Program EEProm
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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.

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.
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