AERCO BMK 1500-2000 - Manual (Page 35)

Benchmark 1500 - 2000 Boilers
CHAPTER 3 – OPERATION
OMM-0097_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 35 of 188
GF-142
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 valve position (fire rate) is being controlled using
the front panel keypad. This mode of operation is for service
technician use only.
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.
On a BST Master, display flashes & shows header temperature.
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
• BST Messages
4 RS-232 Port
Port permits a Laptop Computer or External Modem to be
connected to the unit’s Control Panel. AERCO offers for purchase
the RS232 Adaptor Cable (P/N 124675), which is designed to
work with this port. This cable features a DB9 connector for
connection to older computers with serial ports or can be used
with a Serial-to-USB adaptor for use in modern computer USB
ports.
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alarm is no longer valid.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.