Lochinvar KNIGHT 801 - Manual (Page 19)

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1
Service
(continued)
Viewable and changeable control parameters
Service Manual
General
Time and Date
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 boiler is first
installed or anytime the boiler has been powered off for more
than four (4) hours. This parameter must be accessed to set
the clock.
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 boiler. 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 the Temperature Units parameter.
The default is °F.
Space Heating (SH) and Domestic Hot Water (DHW)
Night Setback Offset
Once the unit’s internal clock has been set correctly, the
Night Setback feature can be used to program a lower set
point during unoccupied times. Both the space heating and
DHW can be programmed for night setback. When in night
setback, the control reduces the set point by a fixed amount.
For space heating, it subtracts the space heating night setback
offset from each of the SH user set points (SH1, 2, and 3 Set
point parameters), or the calculated outdoor reset set point (if
lower). For DHW, it subtracts the DHW night setback offset
from the tank set point (Tank Set point parameter).
NOTE: The DHW night setback will not work without a tank
sensor installed.
The installer may adjust the space heating night setback
offset by accessing the SH Night Setback Offset parameter and
the DHW night setback offset by accessing the DHW Night
Setback Offset parameter. The minimum setting is 0°F (0°C)
and the maximum setting is 90°F (50°C).
Space Heating (SH) and Domestic Hot Water (DHW)
Night Setback On Times
This is the time in which the SH Night Setback Offset becomes
active. There are 7 start times and 7 stop times each for the
space heating and DHW night setback features. 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 space heating night setback start triggers by
accessing the SH Night Setback On Times parameter. The DHW
start triggers in the DHW Night Setback On Times parameter.
This screen shows the start trigger number, the day of the week,
and the time of day.
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 General menu, or press the LEFT SELECT
[EXIT] key to return to the General menu without saving the
changes.
Space Heating (SH) and Domestic Hot Water (DHW)
Night Setback Off Times
The corresponding space heating night setback stop triggers are
set by accessing the SH Night Setback Off Times parameter. The
stop triggers for the DHW night setback feature can be adjusted
by accessing the DHW Night Setback Off Times parameter. The
adjustment procedure for these parameters is identical to the
space heating start triggers described above.
Night Setback Override
Any Night Setback On trigger currently active or scheduled
within the next seven (7) days can be skipped. To skip a trigger,
press the MENU key for 5 seconds, enter the user password,
and press the SAVE key. Rotate the NAVIGATION dial to NSB
OVERRIDE, and press the NAVIGATION dial. A list of the
current (if active) and upcoming NSB On triggers will appear.
CAUTION
Before changing parameters, note the
settings so that the unit can be returned to
its original operating parameters.
NOTICE
The internal clock does not adjust for
Daylight Savings Time and therefore,
will require a manual adjustment.
Please note that the brackets ([]) denote
screen status.
NOTICE