Watts AERCO KC Series, User Manual

Page: 16 / 82

CONTROL PANEL OPERATING PROCEDURES
11
The third LED, “ON”, indicates the status of the
start relay, (see 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
q
F or
q
C,
(see Fig. 3.2).
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
× Ø arrow keys to change the
parameters value. Once a parameters value has
been changed the ENTER key must be
depressed for the change to be recognized by
the controller. Leaving the desired parameter
without entering the new value will result in that
parameters value defaulting back to the original
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 Appendix E of this manual.
Each menu level is described below.
3.3 THE PRIMARY MENU
The primary menu is the default menu. When in
another menu level and there is no activity for 5
minutes the temperature controller will default
back to the primary menu. The Primary menu
allows the operator access to the following
temperature controller parameters:
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 variables
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% firing rate equals approximately
500,000 BTU gas input while a 75 % firing rate
equals approximately 750,000 BTU gas input.
CAUTION:
Do not leave the unit unattended while in
the manual mode of operation.