LAARS EBP 175 MBTU/h - Installation, Operation and Maintenance Instructions - Manual (Page 23)

Endurance Page 23
Figure 31. Control Logic Example.
off. If there is still a call for heat, it will energize
again when it reaches the Burner On Point. SP
default value is 190°F (88°C). It is adjustable from
170-210°F (77 - 99°C). SP has a fixed 10°F (6°C)
differential to the Burner Control Point. SP minus the
10°F (6°C) differential gives you the Burner Control
Point, which is the temperature the Endurance will
attempt to maintain, using its modulation features. The
differential between SP and the Burner On Point is
adjustable, using the Burner On Differential.
6.4.2 “PO” Pump Operation
This parameter, shown as “PO” in the selection
screen, allows the user to choose between the
Endurance pump running continuously (“Con”), or
running in the automatic mode (“Aut”) such that the
pump is energized only when there is a call for heat,
and has the option of a pump time delay when the call
for heat ends.
6.4.3 “Pd” Pump Delay
Pump delay is shown as “Pd” on the screen.
When pump operation “PO” parameter is set for
automatic (“Aut”), the user can choose the pump delay
6. Calculated Setpoint for Outdoor Reset (shown as
“CSP” – when used) – The temperature that the
controller has calculated for a setpoint, based on
the outdoor temperature, when outdoor reset is
being used.
6.4 Setpoint Menu
The setpoint menu is accessed by pressing the
enter button, and holding it for 3 seconds. Move
through the setpoint parameters by pressing the up and
down arrows. When the desired parameter is displayed,
press the enter button. Use the up and down arrows
to change the value of that parameter, and press enter
to save the change. Parameters that can be set on the
Endurance boilers are shown in the next sections.
The boiler control will automatically return to the
view mode if the control buttons are not pressed for 30
seconds.
6.4.1 “SP” Supply Temperature
Shown as “SP” in the control, the supply
temperature is the Burner Off Point. When the
temperature of the water that is leaving the boiler heat
exchanger reaches this setting, the Endurance shuts