7
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optional ED510 display. Refer to the section using the optional ED510 display for detailed
information.
The ED510 display operates at 4800 baud only. To use the ED510 display, power must be
removed and dip switches 1 & 2 must be set in the
CLOSED
position.
Dipswitch Definitions
Baud Rate:
On every application of power, the communication baud rate is determined by
switches 1 & 2. The available selections are 4800, 9600 ad 19200 baud.
Note the ED510
requires the baud rate to be set at 4800, switches 1 & 2 closed.
Post Purge
: If enabled, Terminal #8 (blower motor or contactor) will remain energized for
60 seconds after terminal #7 or Terminal #6 is detected as open.
PTFI Time
: The length of time that Terminal #3 and Terminal #4 will be energized after the
pre-purge period to detect pilot flame.
Prove Air Flow Open:
After power is detected on Terminal #7 (limit control) and before
energizing Terminal #8 (blower motor or contactor) no power must be detected on Terminal
#6 (running interlock switch). If power is detected on Terminal #6, the MicroM will hold
for 60 seconds after which safety lockout will occur. On recycle operation, if this is enabled,
Terminal #8 will be de-energized to allow Terminal #6 to open.
Recycle:
Applies to air flow interlock opening during the Run condition. If the air flow
interlock (Terminal #6) opens, the control will de-energize Terminals #3, #4 and #5, and if
Recycle is selected a new prepurge period will begin. Lockout and alarm will occur imme-
diately after air flow interlock opening if Non-Recycle is selected.
LED INDICATOR LIGHTS
The MEP696 Programmer Module has 5 LED lights to indicate the operating status of the
control and also to display the coded sequence under locked out conditions. The function of
the lights under a normal operating condition is:
Operating Control:
This LED is energized whenever the burner control switch and all
other various limit switches are closed and power is applied to Terminal #7.
Interlock or Air Flow:
This LED is illuminated whenever power is detected on Terminal
#6, indicating the air flow switch or other running interlock is closed. If the operating con-
trol is closed and the running interlock switch remains open, this LED will flash at a 1 sec-
ond rate. Lockout will occur if the switch remains open for 10 seconds into the start of the
cycle.
PTFI:
This LED is illuminated only during the pilot trial for ignition period and the stabili-
zation period.
Flame:
This LED is on whenever a flame signal is detected, and the control is not in a
locked out state.
LED
INDICATORS
SWITCHES
(shown in closed or OFF position)
DIP
