Manuals / Lochinvar / Household Appliance / Water Heater

Lochinvar 1 service manual Sequence of operation space heating and HW

Models: 1

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Service Manual

1 Service

Sequence of operation

Table 1A Sequence of operation - space heating and HW

Note: This unit is equipped with two (2) independent, but synchronized combustion systems. Heat Exchanger 1 (top) 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 switches, louver proving switch (field installed), 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, 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 satisfied, 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 pumps will be turned off.

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Lochinvar 1 service manual Sequence of operation space heating and HW
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1 specifications

Lochinvar 1 is a remarkable achievement in the realm of modern technology and engineering. As a powerful and efficient water heater, it has been designed to cater to a wide range of residential and commercial needs. One of the standout features of Lochinvar 1 is its advanced heating technology, which incorporates a high-efficiency condensing design. This technology allows the unit to achieve impressive energy savings by maximizing heat transfer while minimizing energy consumption.

The Lochinvar 1 utilizes a stainless steel heat exchanger that enhances durability and corrosion resistance. This not only extends the lifespan of the unit but also ensures consistent performance over time. Coupled with a user-friendly control system, users can easily adjust settings and monitor performance, enhancing overall convenience and usability.

Another key characteristic of the Lochinvar 1 is its compact design, making it suitable for a variety of installation environments. Whether in a residential basement or a commercial utility room, the unit’s space-saving configuration allows for efficient use of available area without compromising on capability.

Safety features are integral to the Lochinvar 1, providing peace of mind for users. The unit is equipped with advanced monitoring systems that can detect irregularities and automatically shut down the system if necessary. This not only protects the equipment but also enhances the safety of the environment in which it operates.

In terms of performance, Lochinvar 1 boasts a high recovery rate, ensuring hot water is available on demand. This is particularly beneficial for settings with high water usage, allowing simultaneous operations without lag.

Moreover, the unit supports various venting options, offering flexibility during installation. Whether using traditional vertical venting or innovations like direct venting, Lochinvar 1 accommodates different building designs and local codes, making it highly versatile.

In conclusion, Lochinvar 1 epitomizes the melding of efficiency, reliability, and user-friendly technology. With its high-performance features, robust safety systems, and adaptable installation options, it stands out as a forefront player in the water heating industry, meeting the diverse needs of today's consumers and businesses alike.