Service Manual

3 Troubleshooting

Table 3-4(continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT

DESCRIPTION

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

APS:

 

 

 

 

 

• Check the wiring connections to switch. Wires should

 

 

be connected to the common and normally closed

 

 

terminals.

 

 

 

 

 

• Air intake lengths exceed the maximum allowed

 

 

lengths. Refer to Section 3 - General Venting of the

 

 

Knight XL Installation and Operation Manual for

 

 

proper lengths.

 

 

 

 

 

• Check for obstruction or blockage

in the

air

APS / HEX

 

intake pipes or at terminations.

 

 

 

• Check reference hoses connected to the air pressure

Temp Sw

 

switch for blockage or obstruction.

 

 

Open

Either the air pressure switch contacts are

• Inspect the burner. Reference page 31 of this manual

(will require a manual

reset once the condition

open, or the O-temp heat exchanger switch

for removal and cleaning procedures.

Replace if

necessary.

 

 

 

has been corrected.

has opened.

 

 

 

• Inspect the heat exchanger.

Reference page 32 of

Press the RESET button

 

 

this manual for removal and cleaning procedures.

on the SMART SYSTEM

 

 

Replace if necessary.

 

 

 

display to reset.)

 

• Faulty air pressure switch. Replace switch.

 

 

 

 

 

 

 

 

 

 

 

O-TEMP HEX SWITCH

 

 

 

 

• Inspect the back of the inner combustion chamber at

 

 

burner level for refractory breakdown / missing.

 

 

Replace heat exchanger if refractory is broken and unit

 

 

has fired.

 

 

 

 

 

• Check continuity across two contacts. Wires should be

 

 

connected at both poles of the normally closed switch.

 

 

• Faulty O-Temp HEX Switch. Replace switch.

 

 

 

 

 

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.

 

 

 

 

 

 

 

• Inspect spark electrode and associated wiring for

 

 

damage and connection. Reference page 31 of this

Flame Fail Ign

 

manual for removal and cleaning procedures.

(will require a manual

 

Replace if necessary.

 

 

 

 

• Check for proper electrical grounding of the unit.

 

reset once the condition

The unit has failed to prove main burner

 

has been corrected.

• Check incoming supply gas

pressure.

Natural

gas

Press the RESET button

ignition after four (4) attempts.

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

on the SMART SYSTEM

 

 

LP gas pressures should be between 8 - 14 inches w.c.

display to reset.)

 

Refer to Section 7 - Gas Connections of the Knight

 

 

XL Installation and Operation Manual for detailed

 

 

information concerning the gas supply.

 

 

 

 

 

 

 

 

38

Page 37 Page 39
Page 38
Image 38
Lochinvar 801, 400 service manual Temp Sw, Open, Anti-cycling, Flame Fail Ign
Page 37 Page 39

400, 801 specifications

The Lochinvar 801,400 is a cutting-edge solution in the realm of high-efficiency commercial water heating. This model represents a significant advancement in the design and functionality of water heaters, catering primarily to the demands of large-scale facilities like hotels, hospitals, and large industrial operations.

One of the standout features of the Lochinvar 801,400 is its impressive heating capacity, which can produce up to 801,400 BTUs, making it suitable for high-demand applications. This output is crucial for establishments that require a consistent supply of hot water, such as commercial kitchens and laundry facilities. The robust design ensures that it can handle peak demand periods without compromising performance.

Another significant aspect is the innovative use of advanced technology in its operation. The Lochinvar 801,400 integrates smart controls that enhance its efficiency and ease of operation. These controls allow for precise monitoring and adjustment of water temperatures, ensuring that the system operates within optimal parameters while maximizing energy savings. The intelligent monitoring system can provide real-time updates, making it easier for facility managers to keep track of performance and address maintenance needs proactively.

The construction of the Lochinvar 801,400 incorporates durable materials that not only enhance the longevity of the unit but also offer resistance to corrosion and wear. This durability translates into lower maintenance costs and an extended lifespan for the unit, making it a worthwhile investment for businesses.

Moreover, the Lochinvar 801,400 is designed with energy efficiency in mind. It boasts a high thermal efficiency rating, which reduces operational costs and minimizes the carbon footprint of heating operations. This efficiency is critical in today’s environmentally conscious market, where businesses are seeking to reduce their energy consumption and comply with strict regulations.

The design of the Lochinvar 801,400 also prioritizes safety, featuring innovative safety controls and fail-safes that protect both the unit and the users.

In summary, the Lochinvar 801,400 offers a combination of high capacity, advanced technology, durability, and energy efficiency, making it an excellent choice for commercial water heating solutions. As industries continue to evolve, the demand for reliable and efficient water heating solutions like the Lochinvar 801,400 will only increase.
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