AERCO BMS 168 - Manual (Page 36)

Selecting INTERLOCK 2 causes the
Fault Relay to close and generate an
alarm only when Interlock 2 opens.
However, if INTERLOCK 1 opens, a fault
message will be generated but the Fault
Relay will not be closed.
Selecting INTERLOCK 1 causes the
Fault Relay to close and generate an
alarm only when Interlock 1 opens.
However, if INTERLOCK 2 opens, a fault
message will be generated but the Fault
Relay will not be closed.
Selecting NO INTERLOCK causes the
Fault Relay to remain open and not
generate an alarm when either Interlock
1 or Interlock 2 opens.
It should be noted that the BMS will
always shut down the boilers when
Interlock 1 or 2 opens, regardless of the
selected Fault Relay option.
• Select the desired option using the
▲ or ▼ arrow key.
• Pressing and releasing the CONFIG SYS
key a second time displays FAULT
ALARM CLEAR and allows you to select
how faults are cleared. The available
choices are MANUAL RESET or
AUTOMATIC. Toggle to the desired
option using the ▲ or ▼ arrow key.
Prior to placing the BMS in the System
Configuration Mode, the FIELD ADJ key
must be pressed to exit the Field Adjust
Mode. Pressing and releasing the CONFIG
SYS key places the BMS in the System
Configuration Mode and lights the CONFIG
SYS key LED. When this key is pressed,
the display will read CONFIG. SYSTEM
MAKE SELECTION. Refer to paragraph 4.4
for key functions when in this mode.
NOTE
Sample System Configuration mode
displays with their Factory Default
values are provided in Appendix E.
4.4 S
YSTEM
C
ONFIGURATION
M
ODE
D
ISPLAYS
A
ND
F
UNCTIONS
The System Configuration Mode allows you
to program and operate the BMS to
effectively run and manage the performance
of the boiler plant. In order to effectively use
this mode, the SYSTEM CONFIGURATION
OVERLAY provided with the BMS must be
placed over the keypad for proper
identification of key functions (Figure 12).
The System Configuration Mode is entered
by simply pressing the CONFIG SYS key
and verifying that the CONFIG SYS key
LED lights.
The keys described in the following
paragraphs allow you to view or change
settings currently stored in memory. If the
desired setting is not displayed for the
selected BMS parameter, press the ▲ or ▼
arrow key to increase, decrease or toggle
the displayed setting. All changes made will
be stored in memory.
4.4.1 TEMP FAIL MODE
Pressing and holding this key displays the
actual header sensor water temperature in
°F. This is a “Read Only” display and cannot
be changed.
Pressing and releasing this key allows you
to display and select a Temperature Failure
Mode (TEMP FAIL MODE) of either
SHUTDOWN or SWITCH INPUTS.
If SHUTDOWN is selected, regardless of
the operating mode, the BMS will shut down
the boiler plant whenever a temperature
sensor fails or either interlock opens. If the
BMS is operating in the Remote Setpoint
mode, the BMS will also shut down the
boiler plant if the remote 4-to-20-mA input
signal drops below 3 mA. If any of these
failures occur, the fault relay will close and
the BMS will display the appropriate failure
message.
4-10