User’s Manual - Mascot II Boilers and Water Heaters
Page 5
Figure 3. The User Interface.
The Mascot II has an integrated electronic control
that replaces many of the individual component controls
found on older appliances. The control acts as the
ignition control, pump control, high limit and cascading/
lead lag control and more. All of these functions and
setups are managed through the Digital Display.
3.1 Digital Display Navigation
The Digital Display is centered in the middle
of the User Interface and has 3 seperate modes of
control. They are USER, SETUP and DIAGNOSTIC.
The names of these modes gives you an idea of the
levels of control. A USER might be the homeowner or
a service technician. SETUP displays all the controls
needed when setting up or expanding the boiler. And
DIAGNOSTIC is intended for a Mascot ll trained
technician. Please view
Table 1, Table 2, and Table 3
.
USER Mode is the home screen shown on the
control. If the display is not in USER Mode wait for the
display timeout period to be reached or press the Done
button to return to the USER Mode.
SETUP Mode is accessed by holding the up and
down arrow keys simultaneously for 3 seconds.
DIAGNOSTIC Mode can be activated by a trained
Mascot II technician.
Once in a particular menu structure, navigation
consists of pressing the next button to scroll from item
to item and then pressing the up and down arrows to
change values. Once the value is adjusted, the NEXT or
DONE button can be pressed.
MENU ITEM
DEFINITION
F or C
Selects temperature units
LBTHODLOD Outdoor reset enable/disable -
enables menu items
LBT
Low boiler setpoint during outdoor reset
HOD
High outdoor temperature setpoint
LOD
Low outdoor temperature setpoint
RMT Add
Used for Lead/Lag (follow menus)
LL
Lead/Lag enable/disable - enables menu items
HS
Hysteresis - temp range between on/off cycles
bL
Base Load % - input rate before next boiler fires
Sd
Warm weather shut-down temperature
ASC
Anti short cycle - minutes of delay between
startup
bAC
Future use - Press DONE to exit menu.
PAS
Future use - Press DONE to exit menu.
NOTE:
When enabling/disabling functions, select "Done" and wait 30
seconds before scrolling.
Table 2. SETUP Mode Parameters.
MENU ITEM
FUNCTION
RANGE
DEFAULT
Outlet water Displays the current outlet 55-180°F 120°F
temperature water temperature & allows
the setpoint to be adjusted
Inlet water
Displays the current inlet
—
—
temperature water temperature
Delta T
Displays the current
—
—
temperature rise across
the heat exchanger
DHW
Domestic Hot Water
Caution
Stack
Displays the current stack
—
—
temperature temperature
Outdoor
Displays the current outdoor
—
—
temperature air temperature
Firing Rate Displays an indicator of the
—
—
current firing rate based
upon fan RPM. The actual
firing rate may vary.
Table 1. USER Mode Menu.
MENU ITEM
DESCRIPTION
Please view your Install/Operating Manual
Table 3. DIAGNOSTIC Mode Menu.
3. Digital Display and Control
Caution
Scalding Risk: Laars recommends
the use of a thermostatic mixing
valve at domestic hot water
outlet (boiler location) to
reduce potential for scalding.
The following thermostatic mixing
valve model has been tested and
approved for Mascot II application: Honeywell AM100-
US-1. Contact Laars for additional recommended models.
