Lochinvar 1.5, 3.5, 2.5 service manual SH/HWG Night Setback

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1 Service

Freeze Protection Burner On

If running the pumps does not prevent the inlet temperature from falling closer to freezing, the SMART TOUCH control will fire the burner at low fire if in the ON state. The installer can adjust the temperature at which the burner fires by adjusting parameter F4.

Freeze Protection Burner Differential

Once the burner has started firing due to a low inlet temperature, the inlet temperature must increase by this amount before the burner turns back off. The installer can adjust this differential by accessing parameter F5.

HWG/SH Switching Time

When a boiler has a HWG demand and it receives a space heating demand, the SMART TOUCH control will start a timer. Once the timer expires, it will stop the HWG demand and service the space heating demand. The installer can adjust the length of time the boiler will service the HWG demand by accessing parameter F6.

SH/HWG Switching Time

When a boiler has a space heating demand and it receives a HWG demand, it will immediately switch to the HWG demand and start a timer. Once the timer has expired, the boiler will switch back to the space heating demand and start another timer. Once this timer expires, it will switch back to the HWG demand. The installer can adjust the length of time the boiler will service the space heating demand by accessing parameter F7.

Anti-Cycling Time

Once a SH demand has been satisfied, a set amount of time must elapse before the control will respond to a new SH demand. The control will block the new heat demand and anti-cycling will be shown in the display until the time has elapsed or the water temperature drops below parameter F9. This parameter can be changed by the installer by accessing parameter F8.

Anti-Cycling Differential

The control will bypass the anti-cycling time if the inlet water temperature drops too much. The control will use the inlet water temperature at the time the boiler shut off as the starting point. If the inlet temperature drops below this temperature parameter the control will abort anti- cycling and allow the boiler to fire. This parameter can be changed by the installer by accessing parameter F9.

Service Manual

HWG Rate Liming (NOT AVAILABLE AT THIS TIME)

This parameter determines the maximum rate to be used when heating a HWG tank. This setting may be used when the tank is unable to accept all of the BTU’s available from the boiler. This parameter may be adjusted by the installer by accessing parameter F10.

Service Mode Timeout

The Service Mode allows the installer to set the unit to any firing rate for the purpose of combustion analysis. The delay sets the length of time the boiler will stay in the Service Mode if no keys have been pressed before going back to its original state. This parameter can only be changed by the installer by accessing parameter F11.

Controlling Sensor

The SH controlling sensor parameter selects the sensor the control will use to regulate the boiler firing rate. This parameter is adjustable by the installer by accessing parameter F12. The sensor selections are as follows: The outlet sensor regulates the firing rate based on the outlet water temperature of the boiler and the inlet sensor regulates the firing rate based on the inlet water temperature of the boiler. If the outlet sensor is selected, and the optional system supply sensor is connected, the control will regulate the firing rate based on the system supply sensor temperature.

Inlet Control Time Delay

When the inlet sensor is selected as the controlling sensor, the SMART TOUCH control will start by controlling the outlet/ system supply temperature to the SH set point. After a time delay, the control will start to increase and regulate the system supply temperature in order to maintain the inlet/system return temperature to the SH set point. This time delay should be long enough for the heated water to work its way through the system loop and be measured by the inlet/system return sensor. This time delay is adjustable by the installer by accessing parameter F13.

G/H: SH/HWG Night Setback

The installer may adjust the space heating night setback offset by accessing parameter G1 and the HWG night setback offset by accessing parameter H1.

Once the internal clock has been set correctly, the SH night setback feature can be used to program a lower set point. The value of this parameter will be subtracted from the normal set point to determine the set point used during night setback. This parameter can be changed by the user or the installer by accessing parameters G2 through G15 and H2 through H15. The temperature range for this parameter is 0°F to 90°F (50°C). The feature is turned off with a setting of 0°F.

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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 Maintenance What is in this manual?Service TroubleshootingService Boiler pipingHome Screen Smart Control Module Control inputsControl outputs StripHow the boiler operates Access modesGeneral Operation How the control modules operateTo adjust and save parameters reference FIG Sequence of operation Parameter table Sub Parameter Name See Min Max Default User InstallerValue Access MenuDelay 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 Cascade Offset ModBusCascade Minimum On/Off TimePumps Service Notification Running Hours Service NotificationService Notification in Months Service Notification CyclesService Cascade Screen 8Cascade ScreenGraph Screen 9Graph ScreenParameter SelectionService History Screen 11History ScreenLockout Faults13History ScreenRuntime History Service Screen 14Service ScreenOwner maintenance Maintenance Maintenance and annual startupService technician See the Crest User’s Information Manual for InstructionsMaintenance Check expansion tank Flue vent system and air pipingCheck water system Check boiler relief valveCheck control settings Check ignition ground wiringCheck all boiler wiring Check flame signalCleaning boiler heat exchanger Review with ownerCheck the following TroubleshootingBefore troubleshooting Check control module fusesTroubleshooting Checking temperature sensors No Pump Low Water Cutoff OpenFlame Failure Anti-cyclingIgnition Flame Out Flame Out SequenceRunning Gas Valve / Relay Failure Unit was running and lost the flameHigh Limit Auto ResetManual Reset High Limit OpenFault Description Corrective Action Delta T High Louver Proving Sw OpenFlue Temp High Outlet TempRem Ctrl Flt Service BlkOutlet Temp High Parameters SavedSensor Shorted Switch OpenSensor Open Flue SensorBurner Supply TemperatureDifferential Too Many Resets Try LaterInternal Fault Writing toWrite EEProm Watch Dog ErrorNo Error Stored CRC ParametersOr Obstruction Combustion Analysis ProcedureGas Valve Adjustment Gas Supply PressureGas valve adjustment procedure 2Gas Valve Adjustment Models 1.5Page
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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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