AERCO KC1000 Boiler equipped with Mod-Box Controller - Manual (Page 17)

CONTROL PANEL OPERATING PROCEDURES
12
To access the percent of firing rate press the
INDEX button while in the primary menu until
(Pct) is displayed in the lower LED. Use the
! "
arrow key to increase or decrease the
percentage of firing rate. Press the ENTER
button to accept the desired change. Figure 3.4
shows the temperature controller displaying a
100% firing rate.
Figure 3.4
Percent of Firing Rate Display
WARNING:
WHEN SWITCHING FROM AUTO TO
MANUAL MODE, THE FIRING RATE
DOES NOT CHANGE. THE UNIT WILL
CONTINUE TO OPERATE AT THE SAME
FIRING RATE PERCENTAGE AS WHEN
THE UNIT WAS IN AUTO MODE.
3.3.3 SETPOINT (Setp)
Setpoint is the desired outlet water temperature
that is to be maintained by the unit when in
automatic mode. Fig 3.5 shows the controller
with a setpoint of 120º F.
To access the unit’s setpoint press the INDEX
button until (Setp) is displayed in the lower LED.
To increase or decrease the unit’s setpoint press
the
! " arrow keys. Press the ENTER button to
accept the change.
Figure 3.5
Setpoint Display
NOTE:
Changing the setpoint will only be
recognized when the unit is in the automatic
mode.
3.3.4 AUTOMATIC / MANUAL (Auto)
When set to automatic mode the controller is
receiving and processing inputs from
temperature sensor(s) located externally or on
the unit. The controller uses these inputs to
automatically decrease or increase the firing rate
to match the load.
In manual mode the controller no longer
automatically controls the firing rate of the unit. It
is up to the operator to control the outlet
temperature and firing rate. Manual mode is
commonly used for service and troubleshooting
the unit. All safety limits remain functional
whether the controller is in automatic or manual
mode.
To place the controller in automatic mode press
the INDEX button until (Auto) is displayed in the
lower LED.
Now press the ! " arrow keys until ON is
displayed in the upper LED (see fig 3.6). Press
the enter button to accept the change. The MAN
LED should not be lit.
Figure 3.6
Auto/ Manual Display with Auto On
To place the KC 1000 in manual mode, press
the
! " arrow keys until OFF is displayed in the
upper LED (see Fig 3.7). Press the enter button
to accept the change. The MAN LED should
now be lit.