York International DFAA User's Information, Maintenance And Service Manual page 11

TABLE 5: Oil Burner Operation
EXTERNAL ACTION
Power applied to control
Thermostat calls for heat
Call for heat is satisfied
Reset Button pushed two times without
device completing a call for heat
Unitary Products Group
Internal safety check conducted. If no light or flame is detected and all internal conditions are correct, con-
trol enters Idle Mode.
1. Shorts across T - T terminals (on a call for heat) in warm air system and/or provides power to limit ter-
minals. Systems with EnviraCOM
3.
2. Safety period (5 seconds) internal and external check for flame or light. If flame or light is detected,
control remains in the Idle Mode.
3. When flame or light is not present:
a. R7184B,P,U (if valve-on delay is enabled) will apply power to the burner motor and igniter, enter/
complete valve-on delay period and then apply power to the valve.
4. Control enters trial for ignition period.
a. Monitors burner for flame.
b. When flame is not detected:
• Enters lockout mode (after lockout time of 15, 30, or 45 seconds).
• Shuts off valve, igniter and burner motor.
• Flashes indicator light at 1/2 second on, 1/2 second off.
• Depress reset button to return to power-up sequence.
c. When flame is detected, Carry-Over period begins.
5. Control enters Ignition Carry-Over period (continues to spark for 10 to 30 seconds).
a. Turns on indicator light.
b. If flame is lost and lockout time has not expired, R7184 returns to Trial for Ignition period.
c. If flame is lost and lockout time has expired, R7184 enters Recycle Mode.
6. Carry-Over time expires: igniter turns off.
7. Enters Run Mode:
a. Flame is monitored until call for heat ends or flame is lost. If flame is lost:
• Control enters Recycle Mode.
• Recycle time starts (60 seconds).
• Burner and valve are turned off.
• Indicator light flashes at 2 seconds on, 2 seconds off.
• Returns to Idle Mode at end of Recycle Mode.
1. R7184B,P,U (if burner motor-off delay is enabled):
a. Oil valve shuts off.
b. Burner motor runs for selected burner motor-off delay time.
c. Burner motor turns off.
d. Device returns to Idle Mode.
1. R7184 enters Restricted Mode.
2. Indicator light flashes and 1/2 second on, 1/2 second off.
3. Reset device by pressing and holding reset button for a minimum of 30 seconds.
R7184 PRIMARY CONTROL ACTION
TM
network may receive a call for heat on network connections 1, 2,
107273-UUM-C-0306
11