CHAPTER 3: CONTROL PANEL OPERATION
PR2: 04/22/13 Page
29
of
158
Benchmark 2.0LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0052_0E
GF-127
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
Table 3-1 Operating Controls, Indicators and Displays
ITEM
NO.
CONTROL,
INDICATOR OR
DISPLAY
FUNCTION
1
LED Status
Indicators
Four Status LEDs indicate the current operating status as
follows:
COMM
Lights when RS-232 communication is occurring
MANUAL
Lights when the unit is being controlled using the front panel
keypad.
REMOTE
Lights when the unit is being controlled by an external signal
from an Energy Management System
DEMAND
Lights when there is a demand for heat.
2
OUTLET
TEMPERATURE
Display
3–Digit, 7–Segment LED display continuously displays the
outlet water temperature. The
°F
or
°C
LED next to the
display lights to indicate whether the displayed temperature is
in degrees Fahrenheit or degrees Celsius. The
°F
or
°C
blinks
when operating in the Deadband Mode.
3
VFD Display
Vacuum Fluorescent Display (VFD) consists of 2 lines each
capable of displaying up to 16 alphanumeric characters. The
information displayed includes:
Startup Messages
Fault Messages
Operating Status Messages
Menu Selection
4
RS-232
Port
Port permits a Laptop Computer or External Modem to be
connected to the unit’s Control Panel.
5
FAULT
Indicator
Red
FAULT
LED indicator lights when a boiler alarm
condition occurs. An alarm message will appear in the VFD.
6
CLEAR
Key
Turns off the
FAULT
indicator and clears the alarm message
if the alarm is no longer valid. Lockout type alarms will be
latched and cannot be cleared by simply pressing this key.
Troubleshooting may be required to clear these types of
alarms.
7
READY
Indicator
Lights
ON/OFF
switch is set to
ON
and all Pre-Purge
conditions have been satisfied.
8
ON/OFF
Switch
Enables and disables boiler operation.
9
LOW WATER
LEVEL
TEST/RESET
Switches
Allows operator to test operation of the water level monitor.
Pressing
TEST
opens the water level probe circuit and
simulates a Low Water Level alarm.
Pressing
RESET
resets the water level monitor circuit.
Pressing the
CLEAR
key (item 6) resets the display.
