Lochinvar 151 - 801 Viewable and changeable control parameters, A General, Date and Time

Service Manual

1Service

Viewable and changeable control parameters

CAUTION	Before changing parameters, note the
	settings so that the unit can be returned to
	its original operating parameters.

A: General

Date and Time

The control uses an internal clock for the night setback feature and for logging of events. For these features to work correctly, the clock must be set when the water heater is first installed or anytime the water heater has been powered off for more than four (4) hours. To set the clock, parameter A1 must be accessed.

NOTICE	The internal clock does not adjust for
	Daylight Savings Time and therefore,
	will require a manual adjustment.

Software Version

The software version allows the user to view the software version in use by the control. This software controls the operation of the water heater. When a new software version becomes available, the existing control can be replaced with a new control to update the software.

Software version is read only.

Temperature units (°C / °F)

The control can be configured to display temperature in either °C or °F. This parameter can be changed by the user or the installer by accessing parameter A3. The default is °F.

Domestic Hot Water (DHW) Night Setback Offset

The unit’s internal clock can be set up to run at a lower set point temperature during unoccupied times. When in night setback, the control reduces the set point by a fixed amount. It subtracts the DHW night setback offset from the tank set point (parameter E2).

NOTE: The DHW night setback will not work without a tank sensor installed.

The installer may adjust the DHW night setback offset by accessing parameter A4. The minimum setting is 0°F (0°C) and the maximum setting is 90°F (50°C).

Domestic Hot Water (DHW) Night Setback On Times

This is the time at which the DHW Night Setback Offset becomes active. There are 7 start times and 7 stop times. Both may be set to any time within a 7-day week. These settings are referred to as triggers. Multiple start or stop triggers may be set within a single day, if desired. When a start trigger and a stop trigger are set to the same time, the stop trigger has priority. The installer may adjust the DHW start triggers in parameter A5. This screen shows the start trigger number, the day of the week, and the time of day.

NOTICE	Please note that the brackets ([]) denote
	screen status.

1.When the screen is first accessed, start trigger number 1 is shown. If a different trigger number is desired, the installer can rotate the NAVIGATION dial until the desired trigger number is displayed. Once the desired trigger number is selected, the installer can press the NAVIGATION dial and the day of the week will start to flash.

2.The installer can adjust the day of the week to the one he wishes to set. Once the day is set, the installer can press the NAVIGATION dial and the hour will begin to flash.

3.After setting the hour, the installer can press the NAVIGATION dial and the minutes will flash. Once all settings have been made, the installer can press the RIGHT SELECT [SAVE] key. The installer can now select a different trigger and adjust the settings for that trigger.

4.Once all adjustments are made, the installer can press the RIGHT SELECT [SAVE] key to save all of the new settings and return to the A menu, or press the LEFT SELECT [EXIT] key to return to the A menu without saving the changes.

Domestic Hot Water (DHW) Night Setback Off Times

The stop triggers for the DHW night setback feature can be adjusted by accessing parameter A6. The adjustment procedure for these parameters is identical to the space heating start triggers described above.

Display Timeout

This is the time in which the display remains illuminated. The range is 10 seconds to 10 minutes. The default is 3 minutes.

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