Aerco BENCHMARK 2500DF User Manual page 35

Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
Table 3-1: Operating Controls, Indicators and Displays
CONTROL,
ITEM
INDICATOR OR
NO.
DISPLAY
COMM:
1
MANUAL:
REMOTE:
DEMAND:
OUTLET
TEMPERATURE
2
Display
VFD Display
3
RS-232 Port
4
FAULT Indicator
5
CLEAR Key
6
READY Indicator
7
ON/OFF Switch
8
LOW WATER LEVEL
9
TEST/RESET Switches
OMM-0099_0A
GF-145
CHAPTER 3 – OPERATION
LED Status Indicators
Four Status LEDs indicate the current operating status as follows:
Lights when RS-232 communication is occurring
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.
Lights when the unit is being controlled by an external signal from an
Energy Management System
Lights when there is a demand for heat.
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.
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
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.
Red FAULT LED indicator lights when a boiler alarm condition
occurs. An alarm message will appear in the VFD.
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alarm is no longer valid.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.
Lights ON/OFF switch is set to ON and all Pre-Purge conditions
have been satisfied.
Enables and disables boiler operation.
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.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
FUNCTION
Page 35 of 234
PR1: 05/21/2014