Lochinvar 399 - 800 service manual Anti-cycling, No Flame Ign

Page 33

Service Manual

3Troubleshooting (continued)

Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

 

The main control board has received a call

• The control board will release the call for heat after a

Anti-cycling

for heat too quickly after the previous call for

set time period.

 

 

heat has ended.

 

 

 

 

 

 

• The control board will release the call for heat if the

 

 

 

 

outlet temperature drops too quickly.

 

 

 

 

 

 

The unit has failed to prove main burner

• Inspect spark electrode and associated wiring for

 

ignition after four (4) attempts on the 399

damage and connection. Reference page 26 of this

 

model or one (1) attempt on the 500 - 800

manual for removal and cleaning procedures.

 

models. It will require a manual reset before

Replace if necessary.

 

 

 

attempting to fire again.

• Check for proper electrical grounding of the unit.

 

 

 

 

• Check incoming supply gas pressure. Natural gas

 

 

pressures should be between 4 - 14 inches w.c.

 

 

(1.0 - 3.5 kPa) and LP gas pressures should be

 

 

between 8 - 14 inches w.c. (2.0 - 3.2 kPa).

Refer

 

 

to Section 7 - Gas Connections of the Knight XL

 

 

Installation and Operation Manual for detailed

 

 

information concerning the gas supply.

 

 

 

 

• Verify that the plastic hose from the gas valve to the air

 

 

inlet is connected and is not damaged.

 

 

 

 

• Verify that the vent/air intake pipes are correctly

 

 

installed and that there are no obstructions.

 

 

No Flame Ign

 

• Check for 24 VAC to the gas valve at the 2-pin

 

connection on the side of the main control board during

(will require a manual

 

the ignition attempt. If no voltage is present, replace

reset once the condition

 

the main control board.

 

 

has been corrected.

 

• If 24 VAC is present at the main control board, check

Press the RESET button

 

 

the wiring between the main control board and the gas

on the SMART SYSTEM

 

 

valve. Replace the wiring if necessary.

Do not

display to reset.)

 

 

disconnect the wiring from the gas valve and attempt to

 

 

 

 

measure voltage at that point. The main control board

 

 

can detect if the gas valve is not connected and will

 

 

display the Gas Valve Fail fault.

 

 

 

 

• If 24 VAC is present, check the outlet of the valve to

 

 

ensure the valve is flowing gas. With a manometer

 

 

connected to the outlet tap of the gas valve, when the

 

 

unit is in the prepurge period, there should be a

 

 

negative pressure present. When the valve is

 

 

energized a change in pressure should occur. If the

 

 

pressure change does not occur, the gas valve is not

 

 

opening. Replace the gas valve.

 

 

 

 

• Inspect flame sensor and associated wiring.

 

 

Reference page 26 of this manual for removal and

 

 

cleaning procedures. Replace if necessary.

 

 

 

 

• Inspect the burner. Reference page 26 of this manual

 

 

for removal and cleaning procedures. Replace if

 

 

necessary.

 

 

 

 

• Replace the main control board.

 

 

 

 

 

 

 

33

 

 

 

 

 

 

 

 

 

 

 

 

 

Image 33
Contents Models 399 Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid When servicing boiler Service What is in this manual?Maintenance TroubleshootingNear boiler piping ServiceMenu / Exit UP Down Knight XL displayControl inputs Control outputs Smart Control ModuleHow the boiler operates General OperationHow the control module operates Sequence of operationBLR Ignition Sequence of operationBLR SH 41% Rate Use this procedure to access menus from the display panel Display panel menu accessValue will appear Display panel parameter accessParameter table Temperature DataControl Circulation Service Viewable and changeable control parameters Temperature settingsOutdoor air reset DHW settingsData logging FunctionsShift reset curve Maximum air temperatureMaximum SH set point Minimum SH set pointAnti-cycling SH controlling sensor Control modesSH source Boiler cascade addressService Notification Cascade offsetCirculation pumps Maintenance Maintenance and annual startup Service technicianOwner maintenance 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 Inspect ignition and flame sense electrodesCheck flame signal Cleaning boiler heat exchangerReview with owner Before troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner No DisplayOperation Unit Does NotTemperature Resistance Checking temperature sensorsNo Pump NoisyOperation Boiler Pump System PumpFlow Switch/LWCOFlame SequenceNo Flame Ign Anti-cyclingRunning No FlameLimit w/Manual Adjustable HighFan Low Fan Speed LowFan Speed High Fan HighSensor Open Sensor ShortedTemp O/Shoot Parameters Rem Ctrl FltProgr OpenWatch Dog Error Service BlkNo Error Stored Low 24 VACGas Valve Adjustment Combustion Analysis ProcedureOr Obstruction Gas Supply PressureGas valve adjustment procedure ModelModels 600 Page Page KBX-SER Rev E
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399 - 800 specifications

Lochinvar is known for its cutting-edge water heating and boiler systems, and the Lochinvar 399 - 800 series is no exception. Specifically designed for commercial applications, this series brings advanced technology and engineering to the forefront of hydronic heating solutions.

One of the standout features of the Lochinvar 399 - 800 series is its impressive efficiency. Equipped with a condensing design, these boilers utilize high-efficiency stainless steel heat exchangers that allow for maximum heat transfer while minimizing energy consumption. With an impressive thermal efficiency of up to 96%, the Lochinvar 399 - 800 series stands out in its class, offering significant energy savings and reduced operational costs over time.

Another key characteristic of this series is its robust construction. Designed with longevity in mind, the boilers are built using high-quality materials that withstand extreme temperatures and pressures. The stainless steel design not only enhances durability but also combats corrosion, ensuring a long service life and reduced maintenance costs for users.

The Lochinvar 399 - 800 series also incorporates advanced control technologies. With its intuitive control system, users can easily adjust and monitor heating parameters, ensuring optimal performance and comfort. The integrated Control Wizard feature simplifies the setup process, allowing for quick commissioning and troubleshooting. Additionally, the optional Lochinvar SMART CONTROL technology provides remote monitoring capabilities, allowing operators to keep track of system performance from anywhere.

Versatility is another hallmark of the Lochinvar 399 - 800 series. These boilers come in a range of sizes, with the ability to modulate output based on real-time heating demands. This flexibility ensures that systems can operate efficiently under varying load conditions, making them ideal for schools, hospitals, and commercial buildings requiring consistent hot water availability.

In summary, the Lochinvar 399 - 800 series exemplifies modern boiler technology, combining energy efficiency, durability, advanced controls, and versatility. As businesses and facilities seek to enhance their heating systems, the Lochinvar 399 - 800 offers a reliable and forward-thinking solution for today's energy-conscious environment. Investing in this state-of-the-art boiler system not only improves comfort but also fosters sustainability and cost-effectiveness in commercial heating applications.