S7999B SYSTEM DISPLAY
65-0283—2
60
Burner Control Locks Out Due to Loss of Air
Flow Switch
• The R7999 ControLinks™ controller has a preset of
25% air position/0% fuel for the initial lightoff point.
Depending on the air damper topology, this may not
provide enough airflow to maintain the air flow switch
and cause the burner control to lock out. The R7999
is still functional at this time even though the burner
control is locked out. Therefore, before resetting the
burner control and restarting the lightoff process, you
should first set a new temporary lightoff point to a
higher airflow value to prevent the air flow switch
from dropping out. The next time through the
sequence, the new higher lightoff point may allow the
air flow switch to be maintained or you will have to
repeat the process, i.e., move the lightoff point air
value to a more open value such that the new point
can maintain the air flow switch.
Purge Setting Beyond Maximum Modulation
Point
• A finished profile requires the purge position to be
lower than the maximum modulation. If you
encounter a condition where you are required to
place the maximum modulation point below the
current purge setting, you must first move the purge
point to a lower position. The purge position can be
moved at any time by reselecting the
Air Purge
button in the
Save Position
command window.
R7999 Cannot Establish Communications
• Beyond the difficulties associated with
communications polarity wiring errors, and lack of
power to the R7999, there are several subtle system
errors that preclude communications. All of the errors
are indicated by the green LED and red Lockout LED
being continuously “on.” Fuel select problems after
power up are indicated with all LED’s being “on”
continuously.
a. If no fuel select inputs are on, or both fuel selects
are made, you cannot establish communications
with the controller. The corrective action is to select
one of the fuels or remove one of the fuel select
inputs.
b. R7999 is in a locked out state. The corrective action
is to first reset the control. If that does not work, you
must remove the fault.
Unable to Land on a Predefined Point
• Under unique actuator loading conditions, it may be
difficult to land on an existing programmed point.
This can occur while using the “Move Along the
Curve” command. it can also occur when you are
completing the curve verification process on
extremely flat or steep line segments as you reach
the end of the curve. If you are experiencing
problems, back up from the problem point at least 5
degrees, then move back to the point using a
3-degree, 1-degree or 0.1-degree movement. This
should allow you to complete your curve verification
or land on a problem point for deletion.
Password no Longer Valid
• Bringing an R7999 to an unconfigured state utilizing
the S7999B wipes out the R7999 Commission
password and returns it to the “password” setting.
Enter a new password.
R7999 FAULT CODES AND
CORRECTIVE ACTIONS
The R7999 incorporates two methods to retrieve fault
information:
• Press and hold the reset button. The fault code is indicated
by the blinks of the LED. All codes are two digits. The 10’s
digit is indicated by a series of slow blinks while the 1’s digit
is indicated by a series of short blinks following the slow
ten’s digit. For example, 64 is made up of six slow blinks
followed by four fast blinks. The cadence is repeated as
long as you hold the reset button. The device will not reset
by the action of the reset switch once it enters the flash
mode. To reset the R7999, push and release the reset
button within one second.
• Read the code directly from the Monitor screen of the
S7999B via the Show Faults buttons.