AERCO KC1000 Heater w/Mod-Box Controller - Manual (Page 16)

CONTROL PANEL OPERATING PROCEDURES
11
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.
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.
Figure 3.6
Auto/Manual Display with Auto On