AERCO KC1000 Heater w/Mod-Box Controller - Manual (Page 15)

CONTROL PANEL OPERATING PROCEDURES
10
The third LED, “ON”, indicates the status of the
start relay, (Fig. 3.2). The start relay is internal to
the controller and is part of the start string for the
unit. When this LED is lit there is a demand for
heat and the start relay is closed.
The last two LED’s, “
o
F” and “
o
C”, indicate
whether the temperature displayed is
°
F or
°
C.
NOTE:
When the temperature controller is
displaying in
o
C only the temperature being
displayed is affected. All other settings
remain in
o
F.
Figure 3.2
Temperature Controller Operating Status
Lights
3.2.3 MENU LEVELS
The temperature controller has two menu levels
that are operator accessible for programming the
unit functions and parameters. These are the
Primary and Secondary menus.
To change from the primary menu to the
secondary menu simultaneously depress the
!
arrow key and ENTER button. To change from
the secondary to the primary menu
simultaneously press the
⇓
arrow key and the
INDEX button.
To scroll through a menu, depress the INDEX
button. To change a parameter scroll through the
menu until the desired parameter is indicated on
the controller’s lower LED display. Then use the
!
and
"
arrow keys to change the parameters
value. Once the desired parameters value has
been changed the ENTER key must be pushed
for the change to be recognized by the controller.
Leaving the desired parameter without entering
the new value will result in that parameter value
defaulting back to the previous value. Detailed
descriptions and instructions for accessing each
menu parameter are listed within this section. For
more data concerning the minimum and
maximum range, and factory defaults of menu
parameters, see the Appendix D of this manual.
3.3 PRIMARY MENU
The primary menu is the default menu. When in
another menu level and there is no activity for
five minutes the temperature controller will
default back to the primary menu. The Primary
menu allows the operator access to the controller
parameters listed below.
Code Meaning
tout Actual unit outlet water temperature.
pct Current firing rate of the unit in
percent.
Setp The desired set-point of outlet water
temperature.
Auto Automatic controlling mode ON or
OFF.
3.3.1 OUTLET TEMPERATURE (TOUT)
Outlet temperature is the actual outlet water
temperature of the unit. To access outlet
temperature, press the INDEX button until (tout) is
displayed in the lower LED. The variable under
this feature may not be manually changed. Fig 3.3,
below, shows an outlet temperature of 120º F
Figure 3.3
Outlet Temperature Display
3.3.2 PERCENTAGE OF FIRING RATE
(Pct)
Percentage of firing rate is a number, in percent,
that is related to the input BTU’s of the unit. For
instance a 50% signal equals approximately
500,000 BTU gas input while a 75 % signal equals
approximately 750,000 BTU gas input.
CAUTION:
Do not leave the unit unattended while in the
manual mode of operation.