Lochinvar 502 - 2072, 402 - 2072 service manual Building Management System BMS, Cascade

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

 

 

 

1 Service (continued)

J: Building Management System (BMS)

I: Cascade

I1: Cascade address

The boiler designated as the Leader needs to be programmed with address 0. All the Member boilers require addresses from 1 to 7, and the addresses must be different for each Member. The addresses can be in any order, regardless of the order in which the units are wired together. This parameter is adjustable by the installer by accessing parameter I1. The outdoor air (if used), system supply sensor, and system return sensor must be connected to the Leader boiler. The default address is 1.

I2: Max. outlet set point

When the system supply sensor is connected, or the system supply temperature is provided through ModBus, this parameter determines the set point used by the individual boilers in a Cascade. When a boiler is commanded to fire by the Leader boiler, it will attempt to achieve this temperature at its outlet. The Leader boiler will limit the modulation of the last boiler to fire in order to hold the temperature at the system supply sensor to the user set point. If any of the boiler outlet temperatures reach the max. cascade set point, the boiler will then modulate down on its own in order to keep its outlet temperature within the max. cascade set point. Therefore, this parameter can be used to limit the outlet temperatures of all the boilers in a Cascade. Note that this parameter does not apply when the boiler is heating an indirect DHW tank. This parameter is adjustable by the installer by accessing parameter I2. The temperature range for this parameter is 32°F (0°C) - 261°F (127°C). The default max. cascade set point is 185°F (85°C).

I3: Cascade offset (boilers only)

This parameter determines how much the temperature must go above set point before the lead boiler will turn off. This parameter can be adjusted by the installer by accessing parameter I3. The temperature range for this parameter is 0°F (0°C) - 54°F (30°C). The default value is 9.9°F (5°C).

I4: Cascade differential (boilers only)

This parameter determines how much the temperature must go below the turn off temperature (Set point + Offset) before the lead boiler turns on. This parameter can be adjusted by the installer by accessing parameter I4. The temperature range for this parameter is 0°F (0°C) - 54°F (30°C).The default value is 19.8°F (11°C).

J1: BMS type

When the unit or cascade is controlled by the 0-10V BMS input, the voltage signal can control either the firing rate (power) or the set point. This parameter may be adjusted by the installer by accessing parameter J1. The default value is Power.

J2: Voltage at minimum

This setting determines the voltage at which the external signal begins to increase either the modulation or the set point. Below this voltage, the modulation or set point will be at their minimum values. This parameter can be adjusted by the installer by accessing parameter J2. The range for this parameter is 0V - (J3 - 0.1V). The default value is 2V.

J3: Voltage at maximum

This setting determines the voltage at which the external signal forces either the modulation or the set point to their maximum value. This parameter, along with the previous parameter, determines how much the modulation or set point changes as the BMS input voltage changes. The modulation or set point will change in proportion to the change in voltage between the minimum and maximum voltage settings. This parameter may be adjusted by the installer by accessing parameter J3. The range for this parameter is (J2 + 0.1V) - 10V. The default setting is 10V.

J4: Power at low voltage

This setting determines the modulation of the unit or cascade when the BMS input voltage is at or below the Voltage at Minimum setting. This parameter is active only when the BMS type is set to Power. This parameter may be adjusted by the installer by accessing parameter J4. The range for this parameter is 0 - J5. The default value is 20%.

J5: Power at high voltage

This setting determines the modulation of the unit or cascade when the BMS input voltage is at or above the Voltage at Maximum setting. This parameter is only active when the BMS type is set to Power. This parameter can be adjusted by the installer by accessing parameter J5. The range for this parameter is J4 - 100%. The default value is 100%.

J6: Set point at low voltage

This setting determines the set point used by the unit or cascade when the BMS voltage is at or below the Voltage at Minimum setting. This parameter is only active when the BMS type is set to Set Point. This parameter can be adjusted by the installer by accessing parameter J6. The temperature range for this parameter is 32°F (0°C) - 230°F (110°C) (boilers), 32°F (0°C) to 190°F (87°C) (water heaters), or 32°F (0°C) to 105°F (40°C) (pool heaters). The default value is 70°F (21°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 Service What is in this manual?Maintenance TroubleshootingCopper-fin display ServiceControl inputs Control outputs How the appliance operates General OperationHow the control module operates Sequence of operationOUT 123.8F129 Sequence of operationHTR Postpurge Display panel menu access Display panel parameter access Parameter table Functions Settingsdhw ResetoutdoorAnti-cycle Delay Yes Viewable and changeable control parameters Temperature settings boiler onlyFunctions Data loggingDHW settings Outdoor air reset boiler only Anti-cycling Control modes Cascade Building Management System BMSCirculation pumps Service NotificationService technician Maintenance Maintenance and annual startupOwner maintenance See the User’s Information Manual for instructionsMaintenance Inspect/replace hot surface igniters Check relief valve Inspect/replace hot surface igniterCheck control settings Check all wiringInspect and clean burner Perform start-up and checksChecking combustion air pressure Access to the burner will require the following stepsChecking manifold gas pressure Adjusting combustion air pressureValve Fitting Control Knob Inspect and clean the heat exchanger Review with ownerOiled bearing circulators Before troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner No DisplayOperation Unit Does NotChecking temperature sensors Resistance TemperatureTemperature Resistance No Pump NoisyBoiler Pump System Pump DHW PumpFlow Switch Flame SequenceAnti-cycling No Flame Ign ErrorHSI Current Low Flame CKTNo Flame Auto ResetRunning High LimitInlet Low Manual ResetSensor Open Sensor ShortedTank Open Louver ProvingAPS Open APS ClosedRem Ctrl Flt Temp O/ShootParameters Service BlkProgr Low VoltageNo Error Stored Watch Dog ErrorWrite EEProm 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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