LAARS EBP 175 MBTU/h - Installation, Operation and Maintenance Instructions - Manual (Page 26)

Page 26 LAARS Heating Systems
the Anti-Condensing Valve (ACV) based on the
following boiler conditions:
ACV Open:
• Heating system (T-T) call for heat, when
there is no tank charge or DHW call for
heat.
• Cycles open and then closes every time the
Endurance is powered up.
ACV Closed:
• Domestic hot water (DHW) call for heat.
• Tank charge mode.
• No heating system (T-T) call for heat.
6.6.8 Field-Supplied Outdoor Reset
Controls
When a stand-alone outdoor reset control is used
with the Endurance, it will only have the ability to
reset the system water temperature, and start/stop a
call for heat. Although this will work, be aware that
this will likely cut into the modulation range that the
boiler control is calculating, because the boiler control
is not changing its temperature settings. This may
result in an Endurance that works like an on/off boiler,
rather than the modulating boiler, and may cycle on
and off more frequently than desired.
Endurance units have built-in outdoor reset
capability, with the addition of the outdoor reset
sensor. This will reset the boiler supply temperature,
while ensuring that the temperature is not dropped
enough to affect the domestic water output, and
keeping the return temperature to the Endurance high
enough to prevent condensation on the heat exchanger.
IMPORTANT NOTE: The Endurance outdoor reset
is limited, to ensure that internal water temperature is
high enough to prevent heat exchanger condensation
and to keep the temperature of the water in the
20 gallon transfer tank high enough to serve the
domestic water plate heat exchanger at all times.
SECTION 7.
Boiler Start Up
7.1 Removal of Boiler From
Common Vent
NOTE: This section does not describe a method for
common venting Endurance boilers. It describes
what must be done when a unit is removed from a
common vent system. Endurance boilers are not
permitted to be common vented with any other
appliance(s), including other Endurance appliances.
At the time of removal of an existing boiler, the
following steps shall be followed with each appliance
remaining connected to the common venting system
placed in operation, while the other appliances
remaining connected to the common venting system
are not in operation.
Button Action Result
Up Arrow Press for 1/2 second 1. Scrolls up through view menu
(Upper Right Button) 2. In setup menu, scrolls up through setup menu
3. In setup menu, after parameter is chosen, increases
the value of that parameter
Down Arrow Press for 1/2 second 1. Scrolls down through view menu
(Lower Right Button) 2. In setup menu, scrolls down through setup menu
3. In setup menu, after parameter is chosen, decreases
the value of that parameter
Enter Press and hold for 3 seconds Puts the control is setup mode
(Lower Left Button)
Enter
Press for 1/2 second 1. When in setup view, chooses the parameter that the
(Lower Left Button) user wants to adjust
2. When in setup menu, saves an adjusted parameter
Enter & Up Arrow Together Press both together for 2 seconds High fire hold for 5 minutes
(Lower Left and Upper
Right Buttons Together)
Enter & Down Arrow Together Press both together for 2 seconds
Low fire hold for 5 minutes
(Lower Left and Lower Right
Buttons Together)
Power
Press for 1/2 second When in alarm mode, allows the user to scroll through
(Upper Left Button) menu for 30 seconds
Power Press and hold for 3 seconds Turns control off or on to allow programming without a
(Upper Left Button) call for heat interruption.
Table 4. Boiler Control Button Functions.