Lochinvar 1.5, 3.5, 2.5 service manual Outdoor Reset

Page 19

1 Service (continued)

HWG Minimum User Set Point

This setting controls the minimum user set point for the tank temperature. The installer can adjust this by accessing parameter B10.

HWG Maximum User Set Point

This setting controls the maximum user set point for the tank temperature. The installer can adjust this by accessing parameter B11.

HWG Boiler Set Point

When a HWG call for heat becomes active, the control will use the HWG boiler set point to determine the firing rate of the boiler based on the boiler outlet water temperature.

This parameter can be changed by the installer by accessing parameter B12.

HWG Boiler Offset

This parameter reflects the degrees above HWG boiler set point the outlet temperature can go before the boiler will shut off. This parameter can be changed by the installer by accessing parameter B13.

HWG Boiler Differential

This parameter reflects the degrees below HWG boiler offset the outlet temperature has to go before the boiler turns on. This parameter can be changed by the installer by accessing parameter B14.

Service Manual

C: Outdoor Reset

SH Set Point at Low Outdoor Temperature

When the outdoor air temperature drops to or below the Low Outdoor Temperature setting (parameter C3), the water temperature will be at this setting (see FIG. 1-6). However, if the user set point is set lower, the water temperature will be limited by the user set point instead. This parameter can be changed by accessing parameter C1.

SH Set Point at High Outdoor Temperature

When the outdoor air temperature rises to or above the High Outdoor Temperature setting (parameter C4), the water temperature will be at this setting (see FIG. 1-6). This parameter can be changed by accessing parameter C2.

Low Outdoor Temperature

When the outdoor air temperature drops to its minimum (C3), the water temperature will be at parameter C1 (FIG. 1-6). As the outdoor temperature continues to drop, the water temperature set point will continue to rise. However, if the user set point is set lower, the water temperature will be limited by the user set point instead. This parameter can be changed by accessing parameter C3.

High Outdoor Temperature

When the outdoor air temperature rises to or above this set point, the water temperature will be at parameter C2 (FIG. 1-6). This parameter can be changed by the installer by accessing parameter C4.

Outdoor Air Shutdown

When the outdoor temperature rises above this point, the control will block all SH demands (HWG demands will still be active). This parameter can be changed by the installer by accessing parameter C5.

Figure 1-6Outdoor Air Reset Curve

SET POINT AT

LOW OUTDOOR

TEMPERATURE

(SH)

SET POINT

SET POINT AT

HIGH OUTDOOR

TEMPERATURE

HIGH OUTDOOR

TEMPERATURE

LOW OUTDOOR

TEMPERATURE

19

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Contents Models 1.5 2.0 2.5 3.0 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid 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 Viewable and changeable control parameters Initial SetupSet Points 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 WaterFlame Failure Anti-cyclingIgnition Flame Out Flame Out SequenceRunning 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 ShortedBurner Supply TemperatureDifferential 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.

Safety is a priority in the design of Lochinvar's water heaters. The models come with built-in safety features, including flame failure detection, overheat protection, and venting safeguards. These systems work together to ensure the safe operation of the units, giving users peace of mind.

Another characteristic that makes the Lochinvar 1.5, 1.3, and 1.0 models popular among users is their compact design. These units are engineered to fit in tight spaces, making them ideal for installations where space is at a premium. Despite their small footprint, they deliver powerful performance, ensuring that users have access to the hot water they need.

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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