Lochinvar 2.5, 1.5, 3.5 service manual ModBus, Cascade Offset, Minimum On/Off Time

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1 Service (continued)

I: ModBus

ModBus (Active / Inactive)

When BMS is set to ACTIVE (see BMS Active / Inactive) and the boiler is being controlled through ModBus, set parameter I1 to ACTIVE. Otherwise, set the ModBus parameter to INACTIVE. Note that the boiler can still be monitored by ModBus with this parameter set to

INACTIVE.

ModBus Out of Order Timer

When the boiler is being provided with certain commands and temperatures through ModBus, this information must be updated frequently. If it is not updated before this timer expires, the boiler will revert back to its own internal readings and control. This parameter is adjustable by the installer by accessing parameter I2.

J: Cascade

Cascade Active / Inactive

The boiler is part of a group of units sequenced together. The designated Leader unit determines the total output needed from the group based on the set point and controlling sensor reading. It assigns portions of the output to itself (Leader) and the Member units. When Cascade is active, each boiler in the group requires a unique address. This setting is adjustable by the installer by accessing parameter J1.

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 J2. The outdoor air (if used) and system supply sensor must be connected to the Leader boiler.

Cascade Offset

This parameter determines how much the temperature can go above set point before the lead boiler will turn off. This parameter can be adjusted by the installer by accessing parameter J3.

Service Manual

Cascade Off-On Differential

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 J4.

Maximum Boiler Set Point for Cascade

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. If any of the boiler outlet temperatures reach the maximum cascade set point, the boiler will then modulate down on its own in order to keep its outlet temperature within the maximum 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 HWG tank. This parameter is adjustable by the installer by accessing parameter J5.

Cascade Type

The Cascade divider method is Efficiency Optimization, designated as EFF in the menu. This method is used, as the name implies, when it is desired to have the most efficient system. When the first boiler reaches a certain rate (default = 80%), it lowers its rate to 40% and turns on the next boiler at 40%. The two (2) boilers then modulate at the same rate. As the calculated load increases further and both boilers ramp up to 80%, it lowers the rate of the first two (2) boilers to 53% and brings the next boiler on at 53%. The three (3) boilers then modulate together. As the calculated load decreases, the boilers will reach a lower threshold (default = 10%), at which time the last boiler (the third in our example) will turn off and the Cascade will increase the rates of the remaining boilers to provide the equivalent total output as before ((3 x 10%) / 2 = 15% in our example). This parameter can be adjusted by the installer by accessing parameter J6.

Minimum On/Off Time

In order to prevent units in a Cascade from short cycling, this parameter defines the minimum ON and OFF time for each unit. The installer can adjust this time by accessing parameter J7.

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Contents Models 1.5 2.0 2.5 3.0 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials When servicing boiler Troubleshooting What is in this manual?Service MaintenanceBoiler piping ServiceHome Screen Control inputs Smart Control ModuleStrip Control outputsHow the control modules operate Access modesGeneral Operation How the boiler operatesTo adjust and save parameters reference FIG Sequence of operation Menu Sub Parameter Name See Min Max Default User InstallerValue Access Parameter tableDelay Ramp BMS Setup Setback HWG Night Pumps Set Points Initial SetupViewable and changeable control parameters Outdoor Reset Ramp Delay Advanced Setup SH/HWG Night Setback Minimum On/Off Time ModBusCascade Cascade OffsetPumps Service Notification Cycles Service NotificationService Notification in Months Service Notification Running Hours8Cascade Screen Service Cascade Screen9Graph ScreenParameter Selection Graph Screen11History ScreenLockout Faults Service History Screen13History ScreenRuntime History 14Service Screen Service ScreenSee the Crest User’s Information Manual for Instructions Maintenance Maintenance and annual startupService technician Owner maintenanceMaintenance Check boiler relief valve Flue vent system and air pipingCheck water system Check expansion tankCheck flame signal Check ignition ground wiringCheck all boiler wiring Check control settingsReview with owner Cleaning boiler heat exchangerCheck control module fuses TroubleshootingBefore troubleshooting Check the followingTroubleshooting Checking temperature sensors No Pump Cutoff Open Low WaterIgnition Anti-cyclingFlame Failure Running Flame Out SequenceFlame Out Unit was running and lost the flame Gas Valve / Relay FailureHigh Limit Open Auto ResetManual Reset High LimitFault Description Corrective Action Outlet Temp Louver Proving Sw OpenFlue Temp High Delta T HighParameters Saved Service BlkOutlet Temp High Rem Ctrl FltFlue Sensor Switch OpenSensor Open Sensor ShortedDifferential TemperatureBurner Supply Writing to Resets Try LaterInternal Fault Too ManyCRC Parameters Watch Dog ErrorNo Error Stored Write EEPromGas Supply Pressure Combustion Analysis ProcedureGas Valve Adjustment Or Obstruction2Gas Valve Adjustment Models 1.5 Gas valve adjustment procedurePage
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3, 2, 3.5, 2.5, 1.5 specifications

Lochinvar is a leader in manufacturing high-efficiency water heating solutions, and their Lochinvar 1.5, 1.3, and 1.0 models exemplify the company's commitment to innovation and performance. These advanced heating systems are designed to meet the diverse needs of commercial and residential applications, providing reliable hot water while ensuring energy efficiency and environmental sustainability.

The Lochinvar 1.5, 1.3, and 1.0 models incorporate cutting-edge technologies that set them apart from traditional water heaters. One of the most notable features is their use of high-efficiency condensing technology, which extracts maximum heat from the combustion process. This process allows the units to achieve high thermal efficiencies, often exceeding 95%, which not only reduces energy costs but also lowers greenhouse gas emissions.

In terms of design, Lochinvar's models are constructed with durable materials, ensuring longevity and reliability in demanding environments. The stainless steel heat exchanger is a key element that contributes to the durability and performance of the units. This material is resistant to corrosion and scale build-up, enhancing the lifespan of the heater and reducing maintenance requirements.

The Lochinvar 1.5, 1.3, and 1.0 models feature advanced control systems that provide precise temperature management and easy operation. The intuitive digital display allows users to monitor performance metrics, temperature settings, and energy consumption with ease. Additionally, these units are equipped with intelligent modulating gas valves that optimize fuel usage based on demand, ensuring efficient operation across various load conditions.

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In summary, Lochinvar's 1.5, 1.3, and 1.0 water heating models represent the pinnacle of efficiency, safety, and reliability. With their advanced technologies, durable construction, and user-friendly features, these units are an excellent choice for anyone seeking a high-performance water heating solution.
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