AERCO BMK 3.0 LN Nat. Gas APRIL 2009 - Manual (Page 29)

CONTROL PANEL OPERATING PROCEDURES
Table 3-4. Configuration Menu - Continued
Available Choices or Limits
Menu Item Display Minimum Maximum Default
Failsafe Mode Shutdown or Constant Setpt Shutdown
*mA Output
(See CAUTION) Setpoint, Outlet Temp,
Fire Rate Out, Off
*Fire Rate
Out
Low Fire Timer 2 sec. 120 sec. 2 sec.
Setpt Limiting Enabled or Disabled Disabled
Setpt Limit Band 0°F 10°F 5°F
*CAUTION : DO NOT CHANGE mA Output Menu Item from its Default setting.
3.7 TUNING MENU
The Tuning Menu items in Table 3-5 are Factory
set for each individual unit. Do not change
these menu entries unless specifically requested
to do so by Factory-Trained personnel.
Table 3-5. Tuning Menu
Available Choices or Limits
Menu Item Display Minimum Maximum Default
Prop Band 1°F 120°F 70°F
Integral Gain 0.00 2.00 1.00
Derivative Time 0.0 min 2.00 min 0.00 min
Reset Defaults? Yes
No
Are You Sure?
No
3.8 START SEQUENCE
When the Control Box ON/OFF switch is set to
the ON position, it checks all pre-purge safety
switches to ensure they are closed. These
switches include:
• Safety Shut-Off Valve Proof of Closure
(POC) switch
• Low Water Level switch
• High
Water Temperature switch
• High Gas Pressure switch
• Low Gas Pressure switch
• Blower Proof switch
If all of the above switches are closed, the
READY
light above the ON/OFF switch will light
and the unit will be in the Standby mode.
When there is a demand for heat, the following
events will occur:
NOTE
If any of the Pre-Purge safety device
switches are open, the appropriate fault
message will be displayed. Also, the
appropriate fault messages will be displayed
throughout the start sequence, if the
required conditions are not observed.
1. The DEMAND LED status indicator will light.
2. The unit checks to ensure that the Proof of
Closure (POC) switch in the Safety Shut-Off
Valve (SSOV) is closed. See Figure 3-3 for
SSOV location.
3-7