AERCO KC1000 Low NOx Water Heater July 2011 - Manual (Page 20)

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 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
Alarm Messages
Operating Status Messages
Menu Selection
3 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.
4 RS-232 Port Port permits a Laptop Computer or External Modem to be
connected to the water heater Control Panel.
5 READY Indicator Lights when all Pre-Purge conditions have been satisified.
6 ON/OFF Switch Enables and disables heater operation.
7 LOW WATER LEVEL
TEST/RESET Switches Allow the operator to test the 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.
8 FAULT Indicator Red FAULT LED indicator lights when a heater alarm
condition occurs. An alarm message will appear in the VFD.
9 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if the alarm is no longer valid.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
10 MENU Keypad Consists of 6 keys which provide the following functions for
the Control Panel Menus:
MENU Steps through the main menu categories shown in Figure 3-2.
The Menu categories wrap around in the order shown.
BACK Allows you to go back to the previous menu level without
changing any information. Continuously pressing this key will
bring you back to the default status display in the VFD. Also,
this key allows you to go back to the top of a main menu
category.