Lochinvar 801, 400 No Display, No Burner, Operation, Unit Does, Not Modulate, Above 50%

Models: 400 801

1 48
Download 48 pages 13 Kb
Page 34
Image 34

Service Manual

3 Troubleshooting

Table 3-1Troubleshooting Chart - No Display

FAULT

CAUSE

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

- No 120 vac supplied to unit.

Check external line switch, fuse, or breaker.

 

 

Check position of ON/OFF switch. Turn switch to the

 

 

 

 

 

ON position.

 

 

 

 

 

 

 

 

 

• Check 120 vac through the ON/OFF switch.

 

 

 

• Check wiring

harness connection

between

display

 

 

 

board

and

main

control

board.

Connect

No Display

 

 

harness at both points.

 

 

 

 

 

- No voltage through the switch.

Replace switch.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad display board.

Replace board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Bad main control board.

Replace the main control board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Blown fuse.

Replace

fuse

F3 on

the main

control

board, see

 

 

page 33 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Main control board temperature set point

Review temperature setting.

 

 

 

 

 

 

satisfied.

 

 

 

 

 

 

 

 

 

 

 

- Remote thermostat satisfied.

Review remote thermostat setting.

 

 

 

 

 

 

 

 

 

 

 

 

No Burner

- Outside air temperature above Warm

Check

location of

outside

air

sensor.

Check

Weather Shutdown (WWSD) set point for

 

resistance of outdoor air sensor and compare to Table

Operation

main control board.

 

3-2B on page 35 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Consult

display for

specific

fault.

Refer

to fault

 

- Unit locked out on fault.

 

descriptions on page 37 of this manual for corrective

 

 

 

actions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- Unit in Shutdown Mode.

• Take unit out of Shutdown Mode.

 

 

 

 

 

 

 

 

 

 

Check ramp delay parameter settings. Optional PC

 

- Ramp delay active.

 

software required.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn ramp delay feature off.

See page 23 of this

 

 

Unit Does

 

 

manual for instructions on how to turn this feature off.

 

 

 

 

 

 

 

 

 

 

 

 

• Check BMS parameter settings. Optional PC

Not Modulate

- Boiler controlled by BMS.

 

software required.

 

 

 

 

 

 

Above 50%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Verify that the flue sensor is located in the flue outlet.

 

 

 

 

 

 

 

 

- Flue sensor open.

Check wiring connections at the flue sensor.

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the resistance of the flue sensor and compare

 

 

 

 

 

to Table 3-2D on page 35 of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

34

Page 34
Image 34
Lochinvar 801, 400 service manual No Display, No Burner, Operation, Unit Does, Not Modulate, Above 50%

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.