Aerco Benchmark BMK 750 User Manual page 13

Benchmark 750-3000 Boiler Operation, Service, Maintenance Guide - KOREA
SECTION 2: OPERATION
TABLE 2-1: Controls, Indicators, and Displays (ref. Figure 2-1)
CONTROL, INDICATOR
ITEM
or DISPLAY
Four Status LEDs indicate the current operating status as follows:
COMM =
1
MANUAL =
REMOTE =
DEMAND = Lights when there is a demand for heat.
OUTLET
2
TEMPERATURE
Display
3
VFD Display
4
RS232 Port
5
FAULT Indicator
6
CLEAR Key
7
READY Indicator
8
ON/OFF switch
LOW WATER
LEVEL
9
TEST/RESET
switches
OMM-0128_0C
GF-206-K
LED STATUS INDICATORS
Lights when RS232 communication is occurring – see Item 4.
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.
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 Manager, 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
This port is used only by factory-trained personnel to monitor
onAER communications, in combination with the RS232 Adaptor
Cable (P/N 124675).
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alarm is no longer valid.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 when ON/OFF switch is set to ON and when 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 13 of 146
11/29/2017