Product Overview

16
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6. In the event of a flame failure during a firing period, all fuel valves are de-energized. Following
the prepurge period (as determined by dipswitches #1 through #5), with proven air flow (Air
Flow LED lit), the primary main fuel valve and spark ignition are re-energized and a five or ten
second (as determined by dipswitches #6 and #7) trial for ignition period is initiated (PTFI LED
lit). If flame is detected (Flame LED lit), the secondary main fuel valve (if used) is energized.
The spark ignition is de-energized. If flame is not detected during the trial for ignition period,
the primary main fuel valve and spark ignition are de-energized. A safety lockout occurs, de-
energizing the burner motor and energizing the lockout alarm circuit (Alarm LED lit) approxi-
mately 30 seconds after the safety lockout occurs.
7. Manual reset is required following any safety lockout.
NOTE: Wait 10 seconds after lockout before resetting the control.
Direct Spark Ignited Burners - “Non-recycle” Operation
The function of “non-recycle” direct spark ignited burners is the same as described for the “recycle”
controls, except that the “non-recycle” operation will lock out following any flame failure. “Recy-
cle” or “non-recycle” operation is determined by the position of dipswitch #8. See Programmer
Dipswitch Settings on page 11.
TIMING CHART
Selectable Recycle/Non-Recycle operation on loss of flame after Terminal 5 energized.
Recycle on loss of air flow after flame proven.
TYPE MP230
PROGRAMMING SEQUENCE
L1/7
ON
PURGE
COMPLETE
FIRING
PERIOD
L1/7
OFF
SELECTABLE PTFI
5 OR10 SEC
SELECTABLE
PURGE
8
T
E
R
M
I
N
A
L
S
3
4
5
SELECTABLE
POST PURGE
AIR
FLOW
PROVEN