1 Service
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1 Service
24 VAC Louver Relay Coil
If louvers need to operate when the boiler fires, they can be
controlled by this output.
ModBus / BACnet
An optional ModBus or BACnet interface module can
be used to provide a 0-10V input value for a Building
Management System (BMS) set point or modulation
control.
0-10V BMS In
Boiler set point or firing rate can be controlled using a
BMS 0-10V signal.
0-10V Rate Out
This output provides a 0-10V signal proportional to
the firing rate of the boiler. This may be used by a BMS
controller to monitor the firing rate of the boiler.
Alarm Contacts
The control closes these contacts when the boiler is locked
out or power is turned off. This can be used to turn on an
alarm or signal a Building Management System.
Run Time Contacts
These contacts are closed whenever the boiler is firing.
Typically used by Building Management Systems to verify
the boiler is responding to a call for heat.
Cascade
The heating load may be divided among multiple boilers
when they are wired together in Cascade.
These parameters set operating temperatures and boiler
operating modes. Boiler operation can be based on boiler
outlet water temperature, boiler return water temperature
or system supply temperature, depending on the parameter
setting.
Sequence of operation
Table 1-1 shows control module normal sequences of operation
for space heating and DHW operation. The combined
operation sequence is for a typical application, programmed
to provide DHW priority.
Parameter access modes
User Access
The user can adjust space heating set points, DHW target
temperatures, and high limit settings from the Set Points
Screen. This screen is accessed from the Main Status Screen
by pressing the NAVIGATION dial. The date and time and
the temperature units can also be changed.
Installer Access
Most parameters are available only to the installer, accessible
by entering the password 5309 (see Table 1-2). For installer
menu access, press and hold the LEFT SELECT key [MENU]
key for 5 seconds. Turn the NAVIGATION dial until the first
digit of the password is displayed. Press the NAVIGATION
dial to keep this value and move to the next number. When
the full password (5309) is displayed, press the RIGHT
SELECT [SAVE] key. The screen will now display the installer
parameter menu.
Setup wizard
The Knight Fire Tube boiler control has a Setup Wizard
feature that is automatically accessed the first time the unit is
powered. This feature allows setting of commonly required
parameters without the need to enter the installer password.
Once the Setup Wizard is completed or canceled, it can only
be accessed through the installer menu.
Changing and saving parameters
From the main parameter menu, scroll down to the desired
listing and press the NAVIGATION dial to access the
specific parameter menu (see Table 1-3). Scroll and press
the NAVIGATION dial to adjust parameter settings. Press
the RIGHT SELECT [SAVE] key to retain the settings for
that menu. Once all adjustments for the current menu have
been made, press the LEFT SELECT [EXIT] key to return
to the main parameter menu. Repeat the process for each
menu section as needed. Once all desired changes have been
made, press the LEFT SELECT [HOME] key from the main
parameter menu. This will save all settings to the control.
Service Manual
Please note that the brackets ([]) denote
screen status.
NOTICE
How the boiler operates
The Knight Fire Tube boiler uses an advanced stainless
steel heat exchanger and an electronic control module that
allows fully condensing operation. The blower pulls in gas
and air and pushes flue products out of the boiler through
the heat exchanger and flue piping. The control module
regulates blower speed to control boiler firing rate. The gas
valve senses the amount of air flowing into the boiler and
allows only the right amount of gas to flow.
How the control module operates
The Knight Fire Tube boiler control module receives input
from boiler sensors. The control module activates and
controls the blower and gas valve to regulate heat input
and switches boiler, DHW, DHW recirculation, and system
pumps on and off as needed. The user/installer programs
the module to meet system needs by adjusting control
parameters.
General Operation
