Installation & Operation Manual

10 Operating information (continued)

Sequence of operation

Note: This unit is equipped with two (2) independent, but synchronized combustion systems. The Heat Exchanger 1 combustion system will fire first. If the demand cannot be met by one (1) combustion system the same sequence of operation will be followed to bring the Heat Exchanger 2 combustion system online.

1.Upon a call for heat, the control turns on the appropriate pumps (system and boiler pumps for a space heating call, HW pump relay output for a HW call).

2.The control confirms that the low water cutoff and flow switch (optional) contacts are closed.

3.The control starts the blower and closes the louver contacts to begin the Pre-Purge cycle.

4.The control confirms that the blower comes up to the desired speed, the flap valve opens, and the air pressure switch, gas pressure switch (optional), louver proving switch (optional), and blocked drain switch contacts close.

5.Once the Pre-Purge cycle is complete, the control lowers the blower speed, initiates sparking of the ignition electrode, and opens the gas valve.

6.After a short wait, the control stops sparking and checks for the presence of flame current through the spark and flame sense electrodes.

7.If the control does not detect flame current, the control will lockout indefinitely, until the RESET button on the touch screen LCD is pressed.

If the control detects flame current, the control will hold the blower speed constant for a few seconds to allow the

8.flame to stabilize, then begin modulating the firing rate in order to maintain the controlling sensor to the desired set point temperature.

If the current call for heat is for space heating and a HW call for heat becomes active, the control will turn on the HW

9.pump relay output, then turn off the boiler pumps. It will then modulate the blower speed in order to maintain the outlet temperature to the desired HW outlet set point temperature.

If the first heat exchanger in the boiler is unable to maintain the desired set point temperature, the second heat exchanger in the boiler will be started, using much of the same sequences as described above. Once both heat

10.exchangers are firing, the controls will work in synchronization to maintain the desired set point temperature. If the heat load should decrease sufficiently, the second heat exchanger will be shut down, much like the sequences described below.

11.Once both the space heating and HW calls for heat are satisified, the control will turn off the gas valve and begin the Post-Purge cycle. Any pumps that are running will begin their respective Pump Delay cycles.

12.At the end of the Post-Purge cycle, the louver contacts will open.

13.The control verifies that the blower stops running and the flap valve closes.

14.At the end of the Pump Delay cycle(s), the pump(s) will be turned off.

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Lochinvar 5 operation manual Sequence of operation
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5 specifications

Lochinvar 5 is a cutting-edge residential boiler designed to meet the heating needs of modern homes while ensuring high efficiency and user convenience. As one of the latest offerings from Lochinvar, a trusted name in the heating industry, the Lochinvar 5 combines advanced technology with robust features that make it a top choice for homeowners and contractors alike.

One of the standout characteristics of the Lochinvar 5 is its impressive energy efficiency. It boasts an AFUE (Annual Fuel Utilization Efficiency) rating of up to 95%, which significantly reduces fuel consumption compared to traditional heating systems. This not only translates to lower energy bills for homeowners but also minimizes the environmental impact, aligning with the growing demand for sustainable energy solutions.

The Lochinvar 5 employs a highly efficient modulating burner technology that optimizes fuel usage based on real-time heating demand. This ensures that the boiler operates at peak efficiency, providing consistent warmth without unnecessary energy waste. The inclusion of advanced controls further enhances its performance, allowing users to adjust settings easily and monitor usage through a user-friendly digital display.

Durability and reliability are also paramount in the design of the Lochinvar 5. Constructed with high-quality materials, this boiler is built to withstand the rigors of daily use and provide long-lasting performance. Its compact design allows for flexible installation options, making it suitable for various residential settings, even where space is limited.

In addition to its impressive performance metrics, Lochinvar 5 is equipped with smart technology features that cater to the needs of modern consumers. Wi-Fi connectivity enables remote monitoring and control via a mobile app, giving homeowners the ability to adjust settings on the go. This feature not only enhances user convenience but also allows for proactive maintenance and alerts, helping to prevent potential issues before they arise.

Safety is a key consideration in the design of Lochinvar 5. It includes multiple safety features, such as a sealed combustion system that minimizes the risk of carbon monoxide leaks and an advanced monitoring system that ensures optimal operating conditions at all times.

In conclusion, the Lochinvar 5 stands out as an exceptional choice for those seeking a reliable, efficient, and smart residential heating solution. Its combination of advanced technologies, user-friendly features, and robust construction make it a leading option in the boiler market, ready to meet the demands of today’s homeowners. With an eye on energy efficiency and ease of use, Lochinvar 5 is well-equipped to provide comfortable, cost-effective heating for years to come.
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