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
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.
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 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 to 140°F. The feature is turned off with a setting of 32°F. The default value is 32°F.
Night setback times
If parameter A6 is set to anything other than 32°F, 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 to 190°F. The default value is 125°F.
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 to 190°F. The default value is 70°F.
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 to 190°F. The default value is 190°F.
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 to 86°F. The default value is 10°F.
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