Viewable And Changeable Control Parameters - Lochinvar FTxl 500 Service Manual

1
Service

Viewable and changeable control parameters

Before changing parameters, note the
CAUTION
settings so that the unit can be returned to
its original operating parameters.
General
Vacation Mode
This parameter forces the Space Heating (SH) and DHW set
points to decrease by the amounts programmed in the Night
Setback Offset parameters. It is used to save energy, such
as when the building is unoccupied for an extended period
of time. For this function to work, the Space Heating Night
Setback Offset and/or DHW Night Setback Offset parameters
must be set to a value higher than 0°. The default value of this
parameter is OFF.
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.
The internal clock does not adjust for
NOTICE
Daylight Savings Time and therefore, will
require a manual adjustment.
The clock is automatically updated whenever a PC is connected
and the Win_Pro-Installer program is started.
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).
20
Service Manual
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 and Off Times
These are the times at which the SH Night Setback and DHW
Night Setback Offsets become active and inactive. There are
seven (7) stop times and seven (7) start times each for the SH
and DHW night setback functions. Any start or stop time may
be set to any time during the week. When a start time and a
stop time are programmed for the same day and time, the stop
time has priority (this is how a start time can be disabled).
The installer can adjust the SH Night Setback start and stop
times by accessing the parameter SH NSB On/Off Times. The
installer can access the DHW Night Setback start and stop times
by accessing the DHW NSB On/Off Times parameter. These
settings can be adjusted as follows:
1. When the screen is first accessed, start and stop triggers 1 are
displayed. If a different trigger number is desired, rotate the
NAVIGATION dial until the desired trigger number appears.
Once it is found, press the NAVIGATION dial to adjust the
start and stop times. The day of the week for the start time
will flash.
2. Rotate the NAVIGATION dial to adjust the day of the week
of the start trigger. Once it is set to the desired day of the
week, press the NAVIGATION dial again. The start time
hour will flash.
3. Rotate the NAVIGATION dial to adjust the start time hour
to the desired time. Press the NAVIGATION dial again.
The start time minutes will flash.
4. This process may be continued until the start and stop days
and times are adjusted as desired. When finished with this
set of triggers, press the [SAVE] key.
5. Rotate the NAVIGATION dial to select another set of
start and stop triggers, or press the [EXIT] key to return to
the previous menu.