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Operating information
General
How the boiler operates
The Noble Combi Boiler uses an advanced stainless steel heat
exchanger and electronic control module that allows fully
condensing operation. The blower pulls in air and pushes
flue products out of the boiler through the heat exchanger
and flue piping. The control module regulates blower speed
to control the 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 boiler control module receives inputs from boiler sensors
and external devices. The control module activates and
controls the blower and gas valve to regulate heat input.
Switches the boiler pump on and off and controls the
diverter valve as needed. The user programs the module to
meet system needs by adjusting control parameters. These
parameters set operating temperatures and boiler operating
modes. Boiler operation can be based on boiler outlet water
temperature or system supply temperature.
Menus
Parameters in the set points menu:
- SH SETPT (COLD DAY)
• Space heating water set point temperature, or the
space heating water set point temperature when
outdoor temperature is at the cold day setting if
outdoor reset is used.
•
Range: 68°F – MAX SH SETPT
•
Default:
125°F
- DHW
SETPT
• This is the desired set point temperature of domestic
hot water generated by the unit. Note that the required
anti-scald mixing valve will likely require a setting
greater than the desired domestic hot water
temperature.
• Range: 60°F – MAX DHW SETPT
•
Default:
120°F
- TEMPERATURE
UNITS
• This parameter can be used to select temperature units
to be displayed on the screen (°F/°C)
-
AUTO RESET HI LIMIT
• When the outlet temperature exceeds the Automatic
Reset High Limit setting, automatic high limit action
occurs. The boiler shuts down until the outlet water
temperature cools below 10°F under this setting and
a 60 second timer has elapsed. Note that this setting
applies to both SH and DHW Modes.
• Range: 32°F – 200°F
•
Default:
200°F
-
MAN. RESET HI LIMIT
• If the outlet temperature continues to increase after
automatic reset high limit action, the Manual Reset
High Limit action occurs when the outlet water
temperature exceeds this setting. This will require
a manual reset before operation can resume. Note that
this setting applies to both SH and DHW Modes.
• Range: 32°F – 210°F
•
Default:
210°F
Installer menu (installer only access)
Th
e Installer Menu can be accessed by pressing the
►
button
and then entering the installer password.
Installation & Service Manual
CAUTION
NOTICE
Before changing parameters, note the
settings so that the unit can be returned
to its original operating parameters.
Parameters will be automatically saved
after menu timeout.
Set points menu (user access)
The Set Points Menu can be accessed by pressing the
◄
button.
Figure 11-1 Set Point Menu
Button functions in the set points menu
▲
/
▼
- Change value of current parameter.
►
- Move to the next parameter.
◄
- Save changes and exit the menu.
To exit the menu without saving changes, you must cycle
power to the unit before exiting the menu.
Figure 11-2 Installer Menu
F I R E T U B E C O M B I
™
