Lochinvar 151-286 operation manual Boiler temperature regulation

Page 41

Outdoor Knight Boiler Installation & Operation Manual

8 Operating information (continued)

Monitor external limits

Connections are provided on the connection board for external limits such as a flow switch, low water cutoff and gas pressure switches. The SMART SYSTEM will shut off the burner and inhibit relighting whenever any of these external limits open.

Run-time and alarm outputs

The boiler provides dry contacts for indicating when the boiler is running, and when it is unable to operate.

Run-time and cycle counting

The control uses two timers to monitor the total hours of burner operation. One timer monitors the time the boiler is firing in the Space Heating Mode. The other timer monitors the time the boiler is firing in the DHW Mode.

The control uses two (2) ignition counters to monitor the amount of boiler cycles. The first counter counts all ignitions of the control. The second counter counts only ignition attempts that have failed.

Service reminder

The control can be programmed for service reminder notification. This notification will become active when either a set time frame has expired, or a set amount of running hours or cycles has expired (all adjustable by the installer). The display will show a Maintenance Required screen. The installer's name and phone number can be programmed into the control. This information will appear on the Maintenance Required screen. The service reminder notification can be reset or disabled by the installer.

The time dependent feature has been disabled by the manufacturer. To enable this feature change the parameter to the desired time interval, reference the Outdoor Knight Service Manual for details regarding parameters.

Error logging

The control will hold in memory the last 10 lockouts as well as the last 10 blockings. The date and time of the occurrence will be recorded as well. Only the 10 most current occurrences of each will be held in memory.

Boiler temperature regulation

Operating temperature (target)

The SMART SYSTEM control module senses water temperature and regulates boiler firing and firing rate to achieve a target temperature. The target temperature can be set between 32°F and 190°F.

Target temperature is calculated as described in the “Outdoor Reset Operation” section, when the outdoor sensor is connected.

If the outdoor sensor is not connected, the target temperature is fixed at SH (1 - 3) set points. An outdoor sensor fault will remain on the display screen until the outdoor sensor is reconnected.

High limit operations

The outdoor boiler is equipped with adjustable automatic reset and manual reset high limits. The automatic reset high limit has a maximum set point of 200°F and the manual reset high limit has a maximum set point of 210°F.

When the outlet temperature exceeds 200°F, the automatic high limit action occurs. The boiler shuts down until the outlet water temperature cools below 190°F, and a 60 second timer has expired. If the outlet temperature continues to increase, the manual reset high limit action will occur at 210°F.

High limit test procedure

NOTICE

Please note that the brackets ([]) denote

 

screen status.

 

1.Turn ON the main power to the boiler by placing the ON/OFF switch in the ON position.

2.From the Status Screen, press the NAVIGATION dial to access the Set Points Screen.

3.Press the LEFT SELECT (LIMITS) key.

4.Select the manual reset high limit (MRHL) by rotating the NAVIGATION dial counterclockwise, then press the NAVIGATION dial.

5.Decrease the set point of the MRHL to below the current outlet temperature (or to its minimum setting, whichever is higher) by turning the NAVIGATION dial counterclockwise.

6.Press the RIGHT SELECT [SAVE] key.

7.Press the RIGHT SELECT [HOME] key. The new parameter will upload to the control.

8.If the current outlet temperature is above the new MRHL set point, the MRHL will function causing boiler lockout. If this occurs, skip to Step 11.

9.If the current outlet temperature is below the new MRHL set point, locate the pinhole (SERVICE button) below the RESET button on the display board. Insert a thin probe (such as a paper clip) into the hole and press the button continuously for five (5) seconds to place the boiler into Service Mode. In Service Mode, the boiler will fire at ignition speed and will then modulate up to full fire.

10.Once the outlet temperature rises up to the MRHL set point, the MRHL will function, causing the boiler to shut down and lock out.

11.Repeat Steps 2, 3 and 4.

12.Set the MRHL to the appropriate set point by turning the NAVIGATION dial clockwise.

13.Repeat Steps 6 and 7.

14.Press the RESET button to clear the lockout.

15.If needed, press the RIGHT SELECT [STOP] key to exit Service Mode.

Low water cutoff protection

1.The SMART SYSTEM control module uses temperature sensing of both supply and return areas of the heat exchanger. If the flow rate is too low or the outlet temperature too high, the control module modulates and shuts the boiler down. This ensures boiler shutdown in the event of low water or low flow conditions.

2.Some codes and jurisdiction may accept these integral features of the control in lieu of requiring an additional limit control or low water cutoff. Consult local jurisdiction to determine. A low water cutoff is available from the factory (WTR30024).

41

Image 41
Contents Save this manual for future reference Contents Please read before proceeding When servicing boilerStainless steel heat exchanger Outdoor Knight Boiler How it worksModels 151 Model Outdoor Knight Boiler Ahri Rating RatingsBefore locating the boiler, check Installation must comply withDetermine boiler location Prevent combustion air contamination Provide clearancesOutdoor vent / air intake location Flooring and foundation Gas conversions Prepare boilerRemove boiler from wood pallet 286 Leveling the boilerHydronic piping Near boiler piping components Near boiler piping connections System temperature sensorCirculator sizing Indirect water heatersPressure FeetModel Minimum Pipe Pump Size GrundfosVariable speed pump setup Smart System / Multi-temperature loop control optionVariable speed pump option UP26-96 FC/VS IFC VS Stratos 1.25 3 xZone #1 Number of Units Model Required Pipe Sizes 6Single Boiler Multiple Temperatures 151 211 286 IMG00374 Number of Units 10Multiple Boilers Non-Zoned Primary/Secondary Piping Gas connections Connecting gas supply pipingPropane Gas Natural gasLength of Pipe in Straight Feet for 1/2 PSI Single Unit Natural Gas Pipe Capacity ChartCheck inlet gas supply Gas Pressure Gas valve replacementInstallation must comply with Field wiringLine voltage connections Low voltage connectionsHigh gas pressure switch Outdoor temperature sensorLow gas pressure switch ThermostatAlarm contacts Flow switch Runtime contactsWiring of the cascade System supply sensor3Low Voltage Field Wiring Connections Condensate drain Condensate disposalStart-up Freeze protection when usedCheck/control water chemistry Fill and test water systemCheck thermostat circuits Check for gas leaksInspect/fill condensate system Inspect/check condensate lines and fittingsStart the boiler Final checks before starting the boilerIf boiler does not start correctly Check system and boiler2Operating Instructions Natural Gas Propane Set space heating operationSet domestic hot water DHW operation Verify DHW modeConfiguration of the cascade General Operating informationHow the boiler operates How the control module operatesProtection features Temperature controlBoiler temperature regulation Cascade Outdoor reset operationOperation Display Sequence of operationStandby, ready to start a new cycle Installer Access modesOutdoor Knight boiler control module UserCall for Heat Operating information Dial Function Owner maintenance Maintenance Maintenance and annual startupService technician Maintenance Check water system Flue vent system and air pipingCheck expansion tank Check boiler relief valveCheck all boiler wiring Check ignition ground wiringCheck control settings Check flame signalReview with owner Cleaning boiler heat exchangerOiled bearing circulators Model Kit Part Component Number DescriptionPC Interface DiagramsHigh Voltage 120 VAC

151-286 specifications

Lochinvar 151-286 is a high-efficiency water heater designed for both residential and commercial applications. This model stands out due to its advanced technology, user-friendly controls, and robust construction, making it a reliable choice for those seeking to optimize their hot water supply.

One of the key features of the Lochinvar 151-286 is its impressive heating capacity. With a maximum input of 286,000 BTU/hr, it can efficiently meet hot water demands for a variety of settings, including hotels, restaurants, and other commercial facilities. This substantial output ensures that even during peak usage hours, hot water availability is maximized, reducing wait times and enhancing customer satisfaction.

The water heater utilizes a state-of-the-art condensing technology that maximizes efficiency by capturing and utilizing flue gas heat. This process allows the Lochinvar 151-286 to achieve an impressive thermal efficiency rating of up to 98%. The benefit of such high efficiency translates to significant energy savings and reduced operational costs over time, making it an environmentally friendly option as well.

The Lochinvar 151-286 is equipped with a user-friendly control system featuring advanced microprocessor controls. These controls allow for precise temperature management and monitoring, enabling users to set optimal temperatures according to their specific needs. Additionally, the heater includes built-in diagnostics, allowing for easy troubleshooting and maintenance, which minimizes downtime and extends the life of the unit.

Another standout characteristic of the Lochinvar 151-286 is its durable construction. Built with high-quality materials, including a robust stainless steel heat exchanger, this model is designed to withstand the rigors of daily use. The unit also features a compact design, which facilitates easy installation in various locations, whether it be in a utility closet or alongside existing equipment.

Safety features are paramount in the Lochinvar 151-286, with multiple safeguards in place to protect against overheating and other potential issues. The unit is designed to operate reliably, ensuring peace of mind for users who depend on consistent hot water availability.

In summary, the Lochinvar 151-286 water heater combines high capacity, exceptional efficiency, and user-friendly technology, making it an excellent choice for those seeking reliable hot water solutions. Its advanced features deliver performance and durability that stand out in the competitive market of water heating systems.