AERCO BMK 2.0 LN October 2012 - Manual (Page 122)

Appendix A
Benchmark 2.0LN Low NOx Boiler
GF-123
Menu Items Installation, Operation and Maintenance Manual OMM-
0046_0F
Page 122 of 172 AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288 PR1 10/17/12
Table A-1: Boiler Menu Item Descriptions-Continued
MENU LEVEL & OPTION DESCRIPTION
CONFIGURATION MENU (Cont.)
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.
Analog Output Must be set to Valve Pos 0-10V for BMK 2.0LN.
Low Fire Timer
Specifies how long (2 to 600 sec.) to remain in the
low fire position after ignition, before going to the
desired output. Default is 2 sec.
Setpt Limiting
Allows Setpoint Limiting to be set to Enabled or
Disabled. Default is Disabled.
Setpt Limit Band
When Setpt Limiting is enabled, this menu item
allows the Setpt Limit Band to be set from 0ºF to
10ºF. Default is 5ºF.
Network Timeout
Specifies the timeout value (seconds) before a
Modbus fault is declared. Available settings range
from 5 to 999 seconds. Default is 30 seconds.
HI DB Setpt EN
Operating at a Valve Position below this value will
inhibit the DEADBAND feature. When operating at a
Valve Position below this value, the effective
Setpoint is equal to Active Setpoint + DEADBAND
HIGH. Setting range is from 0 to 100. (Default is 30)
Demand Offset
This entry will reduce excessive ON/OFF cycling in
AUTO mode. When this entry is a non-zero value,
the unit will not turn on again until Valve Position In
reaches the Start Level value AND the Outlet
Temperature goes below the Active Setpoint –
Demand Offset. In addition, the boiler will fire at the
29% Valve Position level or below for a period of
one minute.
When this entry is set to zero, the unit will turn on
again as soon as the Valve Position in reaches the
Start Level value. There will not be a one minute
delay when firing at the 29% Valve Position level.
Setting range is 0 to 25. (Default is 10)