Instruction Manual

Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
APPENDIX A – BOILER MENU ITEM DESCRIPTIONS
Page 142 of 192 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0082_0J
05/21/2014 Ph.: 800-526-0288 GF-130
APPENDIX A: BOILER MENU ITEM DESCRIPTIONS – Continued
MENU LEVEL & OPTION DESCRIPTION
CONFIGURATION MENU (Cont.)
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 750 & 1000.
Lo 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 Setpoint Limiting can be Enables or Disablled. The
default setting is Enabled.
Setpt Limit Band The Setpoint Limit Band can be set from 0 to 10. The
default setting is 5.
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.
Shutoff Dly Temp This feature delays the shutdown of a boiler in order to
reduce excessive cycling. This specifies the temperature
value the Outlet Temperature is permitted to rise above
setpoint before being shut down.
Span is 0 to 25, Default is 10.
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)