Watts AERCO Benchmark 2.0LN, Operating & Maintenance Instructions

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APPENDIX A
A-3
BOILER MENU ITEM DESCRIPTIONS - Continued
MENU LEVEL & OPTION DESCRIPTION
Reset Ratio Permits setting of Reset Ratio when operating boiler
in the Outdoor Reset Mode. Reset Ratio is
adjustable from 0.1 to 9.9. Default is 1.2.
Outdoor Sensor Allows outdoor sensor function to be enabled or
disabled. Default is Disabled.
System Start Tmp If outdoor sensor is enabled in the Configuration
Menu, this menu item allows the system start
temperature to be set from 30°F to 100°F. Default
is 60°F.
Setpoint Lo Limit Used to set the minimum allowable setpoint (40°F to
Setpoint Hi Limit). Default is 60°F
Setpoint Hi Limit Used to set the maximum allowable setpoint
(Setpoint Lo Limit to 220°F). Default is 200°F.
Temp Hi Limit Used to set the maximum allowable outlet
temperature (40°F to 240°F). Any temperature
above this setting will turn off the unit. The
temperature must then drop 5°F below this setting
to allow the unit to run. Default Temp Hi Limit is
210°F.
Max Fire Rate Sets the maximum allowable fire rate for the unit
(40% to 100%). Default is 100%.
Pump Delay Timer Specifies the amount of time (0 to 30 min.) to keep
the pump running after the unit turns off. Default is
zero.
Aux Start On Dly Specifies the amount of time to wait (0 to 120 sec.)
between activating the Aux Relay (due to a demand)
and checking the pre-purge string to start the boiler.
Default is 0 sec.
Failsafe Mode Allows the Failsafe mode to be set to either
Constant Setpoint or Shutdown. Default is
Shutdown.
mA Output Can be set to allow this output to monitor Setpoint,
Outlet Temperature, Fire Rate Out or be set to OFF.
Default is OFF.
Lo Fire Timer Specifies how long (2 to 120 sec.) to remain in the
low fire position after ignition, before going to the
desired output. Default is 2 sec.