AERCO KC1000 Heater 2002 - 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 Four Status LEDs indicate the current operating status as
follows: LED Status Indicators
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 trhe 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if the alarm is no longer valid.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 Consists of 6 keys which provide the following functions for
the Control Panel Menus: MENU Keypad
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.