Product Overview

4. When the operating control opens its circuit, or if a power failure occurs, the entire system is de-

energized. Power interruptions in the millisecond range do not affect the operation of the con-

trol. Power interruptions of 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 pilot flame is not detected by the end of trial for ignition period, the pilot gas

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 sec-

onds 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 pilot gas valve and spark ignition are re-energized and a

five or ten sec. (as determined by dipswitches #6 or #7) trial for ignition is initiated (PTFI LED

lit). If pilot flame is detected (Flame LED lit), the main fuel valve is energized, the spark igni-

tion is de-energized. If the pilot flame is not detected during the trial for ignition period, the pilot

gas 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 sec-

onds after the safety lockout occurs.

7. Manual reset is required following any safety lockout.

NOTE: Wait 10 seconds after lockout before resetting the control.

Pilot Ignited Burners - “Non-recycle” Operation

The function of “non-recycle” pilot ignited burners is the same as described for the “recycle” con-

trols, 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 pages 26

(MC120, MC230) or 28 (MC120P) for direct spark ignited burners provides 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 switch circuit closes (Air Flow LED lit).

2. Following the selected prepurge period (as determined by dipswitches #1 through #5), KL-1

closes, 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 pilot flame is detected (Flame LED lit), KF-1 closes, energizing Terminal 5 which pow-

ers the secondary main fuel valve, and KF-2 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 pilot flame is not detected by the end of the trial for ignition period, the pilot gas

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 sec-

onds after the safety lockout occurs.