Product Overview

19
®
TIMING CHART
Pilot Stabilization timing begins as soon as flame is proven.
Selectable Recycle/Non-Recycle operation on loss of flame after Terminal 5 is energized.
Pilot Ignited Burners - “Non-recycle” Operation
The function of “non-recycle” pilot ignited burners is the same as described for the “recycle” controls,
except that the “non-recycle” operation will lock out following any flame failure. “Recycle” or “non-
recycle” operation is determined by the position of dipswitch #8. See Programmer Dipswitch Settings
on page 11.
Direct Spark Ignited Burners - “Recycle” Operation
With dipswitch #8 in the “recycle” position, the typical wiring arrangement illustrated on page 28
(MC120, MC230) or 25 (MC120P) for direct spark ignited burners will provide the following function:
1. With power applied, and the limit-operating control circuit closed (Operating Control LED lit),
the burner motor circuit is energized. The air flow circuit closes (Air Flow LED lit).
2. Following the selected prepurge period (as determined by dipswitches #1 through #5), KL-1 and
K1-1 close, energizing Terminal 3 which powers the primary main fuel valve, and Terminal 4 which
powers the spark ignition. A five or ten second (as determined by dipswitches #6 and #7) trial for
ignition is initiated (PTFI LED lit).
3. When primary flame is detected (Flame LED lit), an 8 second stabilization period begins and KF-1
closes, energizing Terminal 5 which powers the main fuel valve. Ten seconds later K1-1 opens, de-
energizing Terminal 4 which shuts off the spark ignition.
4. When the operating control opens its circuit, or if a power failure occurs, the control is de-ener-
gized. Power interruptions in the millisecond range do not affect the operation of the control. Power
interruptions at longer duration will cause the control to recycle.
NOTE: Controls with UV amplifiers (MAUV1 and MAUV1T) are always powered via Terminal #1.
5. In the event the primary flame is not detected by the end of the trial for ignition period, the primary
valve and spark ignition are de-energized. A safety lockout occurs which de-energizes the burner
motor and energizes the lockout alarm circuit (Alarm LED lit) approximately 30 seconds after the
safety lockout occurs.
6. In the event of a flame failure during a firing period, the pilot and main fuel valves are de-ener-
gized. 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 5 or
10 sec. (as determined by dipswitches #6 and #7) trial-for-ignition is initiated (PTFI LED lit). If
flame is detected (Flame LED lit), the secondary main fuel valve (if used) is energized. The spark
TYPE MP560
PROGRAMMING SEQUENCE
L1/7
PURGE
COMPLETE
FIRING
PERIOD
L1/7
SELECTABLE PTFI
5 OR10 SEC
SELECTABLE
PURGE
8
T
E
R
M
I
N
A
L
3
4
5
SELECTABLE
POST PURGE
AIR
FLOW
PROVEN
STABLIZATION PERIOD
8 SEC
MTFI
10 SEC