Lochinvar KNIGHT 399 - 800, Service Manual

Page: 17 / 44

1
Service
Service Manual
17
Viewable and changeable control parameters
A: General
Boiler model
The control will display “Knight Boiler” as the model number
because the same control is used on several models. This will be
displayed when parameter
A1 has been accessed. This parameter
is not changeable.
User code
The User Code allows the user to access and change a limited
number of control parameters. The access code can be changed
by the user or the installer to a code of their choosing. To change
the code, parameter
A2 must be accessed. The default code is
0704. The code can be changed one digit at a time by using the
arrow keys on the display.
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 boiler is first installed or anytime
the boiler has been powered off for more than 30 days. To set the
clock, parameter
A3 must be accessed. The date and time are
displayed as “YY:MM:DD W hh:mm”. YY = year, MM = month,
DD = date, W = day (1 = Sunday, 2 = Monday, etc.), hh = hour
(24 hour time; 2:00 PM = 14:00), mm = minutes.
Night setback times
If parameter A6 is set to anything other than 32°F (0°C), the
night setback feature becomes active. This will require start and
stop times to be programmed for the days that reduced
temperatures are required. These times can be changed by the
user or the installer by accessing parameter
A7 . Each day of the
week (Sunday through Saturday) will have an on and off time.
Example: Monday ON: 22:30, Tuesday OFF: 6:45. If you wish
to skip a day and have no night setback, leave the on and off
times the same. The default times for each day will be 00:00
(midnight).
B: Temperature settings
SH set point user
The SH set point user sets the water temperature set point for
fixed operation or the maximum temperature set point when
the outdoor air sensor is used. This parameter can be changed
by the user or the installer by accessing parameter
B1 . The
temperature range of this parameter is 50°F (10°C) to 190°F
(88°C). The default value is 125°F (52°C).
SH minimum set point
The SH minimum set point sets the minimum water
temperature set point that can be used for space heating
operation. The user or installer will not be able to program the
control with a lower SH set point. This parameter can only be
changed by the installer by accessing parameter
B2 . The
temperature range of this parameter is 32°F (0°C) to 190°F
(88°C
)
. The default value is 70°F (21°C).
SH Maximum set point
The SH maximum set point sets the maximum water
temperature set point that can be used for space heating. The
user or installer will not be able to program the control with a
higher SH set point. This parameter can only be changed by the
installer by accessing parameter
B3 . The temperature range of
this parameter is 32°F (0°C) to 190°F (88°C). The default value
is 185°F (85°C).
SH Offset
The SH offset sets how many degrees above set point the
temperature has to go before the boiler will shut off. This
parameter can only be changed by the installer by accessing
parameter
B4 . The temperature range of this parameter is 0°F
(0°C) to 54°F (30°C). The default value is 10°F (5°C).
CAUTION
Before changing parameters, note the
settings so that the unit can be returned to its
original operating parameters.
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.
Temperature units
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
A5 . The default is °F.
Night setback temperature
Once the internal clock has been set correctly, the night setback
feature can be used to program a lower water temperature set
point for space heating. This parameter can be changed by the
user or the installer by accessing parameter
A6 . The
temperature range for this parameter is 32°F (0°C) to 140°F
(60°C). The feature is turned off with a setting of 32°F (0°C).
The default value is 32°F (0°C).
NOTICE
The internal clock does not adjust for
Daylight Savings Time and therefore, will
require a manual adjustment.