Aerco KC Series Installation, Operation & Maintenance Instructions Manual page 17

Figure 3.7
Auto/Manual Display with Manual ON
3.4 SECONDARY MENU
The secondary menu is primarily related to
temperature control. It is necessary to access this
menu when temperature calibrating the unit.
To access the secondary menu, press the
arrow key and ENTER simultaneously. To scroll
through the menu press the INDEX button. The
secondary menu allows access to the following
temperature control features:
Func
tout
FFt
Firing rate of the unit
Pct
The desired set point
SetP
of outlet water temp
SEnS
OFSt
LLt
HLt
Pb1
Int
Drt
Fdb
Addr
Local/ remote status
LOre
CONTROL PANEL OPERATING PROCEDURES
!
Unit's mode of
operation
Outlet water
temperature
Water temperature
at the BTU
transmitter sensor
in percent
High flow
temperature
adjustment
Low flow
temperature
adjustment
Low temperature
alarm
High temperature
alarm
Proportional Band
Integral Rate
Derivative Time
Feedback on or off
Controller address
for external
communication
of the control
For a complete explanation of the secondary
menu parameters see the Appendix A of this
manual.
3.5 THE ANNUNCIATOR CIRCUIT
The annunciator consists of the annunciator
circuit board, the front panel LCD display, and 4
function switches (see Fig. 3.8). The annunciator
circuit board is the interface between the LCD
display and the combustion safeguard system. It
monitors the unit during every phase of operation
and prompts the LCD display with start sequence
and fault messages. The function switches are
used to reset the annunciator and gain access to
the annunciator's three function displays.
Annunciator Function Switches and LCD
The annunciator circuit board and LCD display
are not an integral part of the start sequence or
combustion safeguard system. If either should fail
the unit will still operate with no adverse effects.
The annunciator start sequence messages, fault
messages, function switches and function displays
are explained below.
3.5.1 ANNUNCIATOR FUNCTION
DISPLAYS AND SWITCHES
The annunciator has three function displays that
are available to the operator. These are the
MAIN, the CYCLES, and the SET DATE displays.
These displays are accessed using the four
membrane switches located directly under the
12
Figure 3.8
Display