Watts AERCO Benchmark 2.0, User Manual

Page: 22 / 97

CONTROL PANEL OPERATING PROCEDURES
3-2
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.
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 boiler 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if the alarm is no longer valid.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 when 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 CLEAR resets the display.