User Manual

LAARS Heating Systems
Page 26
SECTION 8.
Control Setup and Operation
The Mascot II control is an integrated electronic
control that replaces many of the individual components
found on older appliances. The control acts as the
ignition control, pump control, high limit and cascading/
lead lag control and is setup using the digital display on
the appliance.
8.1 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 clearly labels the intent of the different
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 trained Mascot ll
technician. The menu structure and variables in each are
shown in Table 9, Table 10, and Table 11.
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 is accessed by holding the
NEXT button for 3 seconds
Once in a particular Mode, 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.
Figure 23. The USER INTERFACE.
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 res
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 10. 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
Stack Displays the current stack — —
temperature temperature
Outdoor Displays the current outdoor — —
temperature air temperature
Firing Rate Displays an indicator of the — —
current ring rate based
upon fan RPM. The actual
ring rate may vary.
Table 9. USER Mode Menu.
MENU ITEM DESCRIPTION
mA Display the ame sense signal
Alert codes Displays the current alert code
Lockout code Displays the current lockout code
Outlet limit Displays outlet temperature limit
DHW limit Displays Domestic Hot Water limit setting
DHW actual Displays Actual DHW temperature
Stack limit Displays Stack limit setting
Min. ring rate Displays the minimum ring rate allowed
Min. forced Allows the user to force the boiler to re at
ring rate the minimum ring rate
Max forced Allows the user to force the boiler to re at
ring rate the maximum ring rate
Rate indicator Displays a indicator of the ring rate based
off of the fan RPM. Actual ring rate may
vary depending upon setup.
Table 11. DIAGNOSTIC Mode Menu.