Installation & Service Manual

8 Maintenance

Figure 8-5_Loosening the transition box screws, Models 1437, 1797 and 2067 only

TRANSITION BOX SCREWS

Figure 8-6_Adjusting the air shutter

DECREASE

AIR PRESSURE

INCREASE AIR

PRESSURE

Servicing a hot surface igniter and ignition module

This unit uses a proven hot surface ignition module and a hot surface igniter. The hot surface ignition module is not repairable. Any modification or repairs will invalidate the warranty.

WARNING Do not attempt to repair a faulty hot surface igniter or ignition module. Any

modification or repairs may create hazardous conditions that result in property damage, personal injury, fire, explosion and/or toxic gases.

A faulty hot surface igniter or ignition module must be replaced with an identical part. A specification igniter and ignition module for this specific unit is available from your local distributor. Do not use general purpose field replacement ignition modules or igniters.

Ignition system checkout

1.Turn off gas supply to unit.

2.Turn electric power on.

3.Adjust the set point on the temperature control to a setting above water temperature or to the highest safe setting.

4.The igniter will cycle on trial for ignition.

5.The ignition module will lock out and turn the alarm light on.

6.Adjust the Set Point Differential and High-Fire Offset to the desired settings.

7.Turn on gas supply.

8.Press the module reset button to reset the ignition module. This is a red button beside the ignition module or on the diagnostic panel on the header-end of the unit.

9.If ignition system fails to operate properly, repair work must be performed by a qualified service person or installer.

Sequence of operation

Overview

This sequence of operation can be considered the order of events in sequential order that occur after the appliance has received a call for heat. The process begins with 120VAC power entering the appliance and ends with the appliance going into an idle state after completion of a successful call for heat.

Note: The following descriptions do not include remotely connected devices that may be connected to the appliance. Refer to the wiring diagram for actual point to point wiring connections that show power delivery.

1.The POWER switch is placed in the “ON” position.

2.120VACpowerissuppliedtothecontroltransformeralong with L1 and F1 on the ignition module.

3.24VAC is supplied to the electronic temperature control, the ignition module and the adjustable high limit control.

4.24VAC is then supplied to the auxiliary limit control (if equipped).

5.If equipped, 24VAC is supplied to a low water cut-off and then to the high and low gas pressure switches.

6.24VAC is supplied to the continuous alarm terminals A1 and A2 and then to the remote stage one terminal strip, 1C and 1NO.

7.24VAC is supplied to the electronic temperature control.

8.The electronic temperature control then calls for heat.

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Lochinvar 497 - 2067 Sequence of operation, Servicing a hot surface igniter and ignition module, Ignition system checkout
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497 - 2067 specifications

Lochinvar 497 - 2067 is a highly efficient and versatile condensing boiler that is designed to meet the diverse heating needs of residential and commercial applications. Known for its impressive performance and advanced technology, the Lochinvar 497 - 2067 has garnered a reputation as a reliable choice among heating professionals.

One of the standout features of the Lochinvar 497 - 2067 is its impressive thermal efficiency. The boiler boasts an efficiency rating of up to 95% AFUE (Annual Fuel Utilization Efficiency), allowing users to significantly reduce their energy costs while minimizing environmental impact. This efficiency is facilitated by its innovative condensing technology, which captures and reuses heat from exhaust gases for optimal performance.

The Lochinvar 497 - 2067 is equipped with a robust stainless steel heat exchanger designed to handle high temperatures and ensure long-lasting performance. The heat exchanger’s design maximizes heat transfer, while its corrosion-resistant properties guarantee durability over time. This contributes to the boiler's overall longevity and serviceability, reducing the need for frequent replacements.

Control is another critical feature of the Lochinvar 497 - 2067. The boiler comes with an advanced control system that enables easy management of system operations. Users can take advantage of features such as outdoor reset control, which adjusts the temperature of the boiler based on external weather conditions, enhancing system efficiency and comfort.

In terms of safety, the Lochinvar 497 - 2067 incorporates several cutting-edge safety features, including a flame detection system and multiple safety shut-off devices. These safeguards help to ensure the safe operation of the boiler, providing peace of mind to users and heating professionals alike.

Another important characteristic is the compact design of the Lochinvar 497 - 2067, which allows for flexible installation in various settings, including tight spaces. Its lightweight structure further simplifies the installation process, making it a practical choice for contractors.

In summary, the Lochinvar 497 - 2067 is an exceptional high-efficiency condensing boiler that combines advanced technology, durability, and ease of use. With its impressive thermal efficiency, superior heat exchanger design, advanced control systems, and enhanced safety measures, it stands out as a top choice for those seeking reliable heating solutions. This boiler not only meets but exceeds modern demands for energy efficiency and performance, solidifying its position in the market.
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