Lochinvar WH 55-399 Knight Wall Mount Boiler How it works, Stainless steel heat exchanger

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Installation & Operation Manual

The Knight Wall Mount Boiler - How it works...

1.Stainless steel heat exchanger

Allows system water to flow around specially designed tubes for maximum heat transfer, while providing protection against flue gas corrosion.

15.Gas connection pipe

Threaded pipe connection. This pipe should be connected to the incoming gas supply for the purpose of delivering gas to the boiler.

2.Combustion chamber access cover

Allows access to the combustion side of the heat exchanger.

3.Blower

The blower pulls in air and gas through the venturi (item 5). Air and gas mix inside the blower and are pushed into the burner, where they burn inside the combustion chamber.

4.Gas valve

The gas valve senses the negative pressure created by the blower, allowing gas to flow only if the gas valve is powered and combustion air is flowing.

5.Venturi

The venturi controls air and gas flow into the burner.

6.Flue gas sensor (limit rated)

This sensor monitors the flue gas exit temperature. The control module will modulate and shut down the boiler if flue gas temperature gets too hot. This protects the flue pipe from overheating.

7.Boiler outlet temperature sensor (housed with high limit sensor)

This sensor monitors boiler outlet water temperature (system supply). If selected as the controlling sensor, the control module adjusts boiler firing rate so the outlet temperature is correct.

8.Boiler inlet temperature sensor

This sensor monitors return water temperature (system return). If selected as the controlling sensor, the control module adjusts the boiler firing rate so the inlet temperature is correct.

9.Temperature and pressure gauge (field installed, not shown)

Monitors the outlet temperature of the boiler as well as the system water pressure.

10.Electronic LCD display

The electronic display consists of 4 buttons, a navigation dial and a multiple line liquid crystal display.

11.Flue pipe adapter

Allows for the connection of the PVC vent pipe system to the boiler.

12.Burner (not shown)

Made with metal fiber and stainless steel construction, the burner uses pre-mixed air and gas and provides a wide range of firing rates.

13.Water outlet (system supply)

The water outlet is the water connection for water leaving the boiler and entering the system.

14.Water inlet (system return)

The water inlet is the water connection for water entering the boiler from the system.

16.SMART SYSTEM Control Module

The SMART SYSTEM Control responds to internal and external signals and controls the blower, gas valve, and pumps to meet the heating demand.

17.Air intake adapter

Allows for the connection of the PVC air intake pipe to the boiler.

18.High voltage junction box

The junction box contains the connection points for the line voltage power and all pumps.

19.Low voltage connection board

The connection board is used to connect external low voltage devices.

20.Low voltage wiring connections (knockouts)

Conduit connection points for the low voltage connection board.

21.Condensate drain connection

Connects the condensate drain line.

22.Access door

Provides access to all internal components.

23.Ignition electrode

Provides direct spark for igniting the burner.

24.Flame inspection window

The quartz glass window provides a view of the burner surface and flame.

25.Gas shutoff switch

An electrical switch designed to cut power to the gas valve to prevent releasing any gas.

26.High limit sensor (housed with outlet sensor)

Device that monitors the outlet water temperature. If the temperature exceeds its setting, it will break the control circuit, shutting the boiler down.

27.Relief valve

Protects the heat exchanger from an over pressure condition. The relief valve provided with the unit is set at 30 psi.

28.Flame sensor

Used by the control module to detect the presence of burner flame.

29.Line voltage wiring connections (knockouts)

Conduit connection points for the high voltage junction box.

30.Transformer

The transformer provides 24V power to the integrated control.

31.ModBus

The optional ModBus option provides intelligent building system communications.

32.On/Off switch

The On/Off switch is used to turn 120 VAC on and off to the unit.

33.Manual air vent

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Allows for removal of trapped air from the heat exchanger.

 

 

 

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Contents Models WH 55 Contents When servicing boiler Please read before proceedingBoiler operation Boiler waterKnight Wall Mount Boiler How it works Stainless steel heat exchangerModels 55 Ratings Knight Wall Mount Boiler Ahri RatingInstallation must comply with Closet and alcove installationsDetermine boiler location Before locating the boiler, check1Closet Installation Minimum Required Clearances Precautions Vent and air pipingWall mounting location Prevent combustion air contaminationProducts to avoid When using an existing vent system to install a new boilerAreas likely to have contaminants When removing a boiler from existing common vent system Remove boiler from wood pallet Prepare boilerGas conversions Mounting the boiler Mounting to a wood studded wallMounting to a concrete wall Mounting to a metal studded wallGeneral venting Direct venting options Sidewall VentInstall vent and combustion air piping Air intake/vent connectionsRequirements for installation in Canada SizingModel Kit Number Equivalent Vent Length Model Max Vent AirMaterials Air inlet pipe materialsOptional room air Air contaminationApproved PVC/CPVC Vent Pipe and Fittings Material StandardVent pipe Vent fittingsPolypropylene ModelCentrotherm InnoFlue SW Duravent Polypro Stainless steel vent If using the alternate sidewall termination Sidewall direct ventingVent/air termination sidewall Determine location2AClearance to Gravity Air Inlets Model Air Vent Centerline Width Prepare wall penetrationsPrepare wall penetrations Alternate Field Supplied Option Multiple vent/air terminationsSidewall termination optional concentric vent Sidewall termination installationDescription and usage 92 and 3 Concentric Vent Dimensional Drawing reference D on Sidewall termination optional concentric vent models12Concentric Vent Sidewall Attachment Multiventing sidewall terminationsVent/air termination vertical Vertical direct ventingPrepare roof penetrations Vertical termination installation Vertical termination optional concentric ventMultiventing vertical terminations Minimum Combustion AIR TypicalAlternate vertical concentric venting Vent / Air Inlet Size Minimum Existing Vent / Chase SizeConcentric Venting Arrangement Existing vent as a chaseHydronic piping System water piping methods General piping informationLow water cutoff device Chilled water systemNear boiler piping components Near boiler piping connections Circulator sizing20F Temperature Rise Applications 25F Temperature Rise Applications35F Temperature Rise Applications Pump Size GrundfosVariable speed pump setup Smart System / Multi-temperature loop control optionVariable speed pump option 3Single Boiler Primary / Secondary Piping Make UP Water Indirect Number of Units Boiler Member 8Single Boiler Multiple Temperature DHW Priority Model Required Pipe Sizes Boiler Make UP Boiler Connecting gas supply piping Gas connectionsNatural gas Propane GasCheck inlet gas supply Natural Gas Pipe Capacity ChartLength of Pipe in Straight Feet for 1/2 PSI Gas valve replacement Gas PressureInstallation must comply with Low voltage connections Field wiringLine voltage connections Outdoor temperature sensor Louver proving switchFlow switch ThermostatAlarm contacts Wiring of the cascadeSystem supply sensor Boiler management systemInstallation FieldwiringCondensate disposal Condensate drainFreeze protection when used Start-upCheck/control water chemistry Fill and test water systemClean/Inspect Trap Assembly Check for gas leaks Inspect/fill condensate systemCheck thermostat circuits Inspect/check condensate lines and fittingsFinal checks before starting the boiler Start the boilerIf boiler does not start correctly Check system and boiler2Operating Instructions Models 55 Operating Instructions Model Set space heating operation Natural Gas PropaneConfiguration of the cascade Verify DHW modeSet domestic hot water DHW operation Operating information GeneralProtection features Boiler temperature regulation Outdoor reset operation, if used CascadeSequence of operation Operation DisplayInstaller Access modesUser Knight wall mount boiler control module 1Control PanelCall for Heat Information Dial Function Maintenance Maintenance and annual startup Service technicianOwner maintenance See the following pages for instructions GeneralMaintenance Check ignition ground wiring Check all boiler wiringCheck control settings Flue vent system and air pipingCheck flame signal Cleaning boiler heat exchangerPerform start-up and checks Check burner flameDiagrams PC Interface2Wiring Diagram

WH 55-399 specifications

The Lochinvar WH 55-399 is a high-efficiency water heater designed for residential and commercial applications, offering a reliable solution for hot water needs. This model represents an advanced approach to water heating, combining cutting-edge technologies and features that ensure optimal performance and energy efficiency.

One of the standout features of the Lochinvar WH 55-399 is its high thermal efficiency, which is a key factor in reducing energy consumption and operating costs. With an efficiency rating exceeding 90%, this water heater ensures that more energy is converted into usable hot water, making it an environmentally friendly choice.

The WH 55-399 utilizes advanced condensing technology, which allows it to extract additional heat from the exhaust gases before they are expelled. This process not only increases efficiency but also significantly decreases greenhouse gas emissions. The unit is also equipped with an intelligent control system that allows for precise temperature adjustments, ensuring that the user has an optimal supply of hot water while maintaining energy savings.

Another important aspect of this model is its impressive recovery rate. The ability to quickly heat water after a significant draw ensures that users will not experience interruptions in their hot water supply, making it ideal for busy households or commercial environments. This is particularly beneficial in applications requiring consistent hot water availability, such as restaurants or athletic facilities.

The Lochinvar WH 55-399 is designed with durability in mind. Constructed from high-quality materials, this water heater boasts a robust tank lined with corrosion-resistant coatings, extending the lifespan of the unit and reducing maintenance needs. Additionally, it features a reliable gas burner and a well-insulated tank, contributing to its overall efficiency and performance.

Safety is also a priority with the WH 55-399. The unit incorporates multiple safety features, including a flame sensor, automatic shut-off valve, and over-temperature protection, ensuring peace of mind for users.

In summary, the Lochinvar WH 55-399 stands out with its combination of high efficiency, advanced technology, and durable construction. Whether for residential or commercial use, this water heater provides a dependable and cost-effective solution for all hot water needs. Its innovative design and performance characteristics make it a top choice for anyone seeking a premium water heating option.
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