Start Up And Safety Check Procedure; Troubleshooting And Maintenance - York International DFAA User's Information, Maintenance And Service Manual

8. BURNER MOTOR-OFF DELAY (Postpurge) - If applicable, the
fuel valve is de-energized and the burner motor is kept on for the
selected postpurge time before the control returns to standby.

START UP AND SAFETY CHECK PROCEDURE

Fire or Explosion Hazard - Can cause severe injury, death or
property damage. Make sure the combustion chamber is free
of oil and/or oil vapor before starting system.
Burner Start-up
1. Open hand valve in oil supply line.
2. Make sure system is powered. Check circuit breaker or fuse and
close system switch located on the right side of the control box.
3. Set thermostat to call for heat.
4. Make sure burner lights and operates until call for heat ends.
5. Verify that burner turns off when thermostat call for heat is satis-
fied.
Safe Start:
1. Place a jumper across cad cell terminals
2. Follow burner start-up. Burner must not start, indicator light turns
on and control remains in Idle Mode.
3. If burner starts, replace control.
Simulate Flame Failure:
1. Follow burner start-up.
2. Close hand valve in oil supply line.
3. Device enters recycle mode.
4. Device tries to restart system after approximately 60 seconds.
5. Safety switch locks out approximately in the selected time indi-
cated on label. Indicator light flashes 1/2 second on, 1/2 second
off. Ignition and motor stop and oil valve closes.
Lockout Mode
The R7184 Primary Control will enter the lockout mode when:
• Flame is detected during valve-on delay.
• When flame is not established during Trial for Ignition.
• When flame is lost three times in one call for heat.
• When flame is detected during burner motor-off delay period.
Diagnostic LED
The diagnostic LED has four states:
• On - Flame present.
• Off - No Flame.
• Two seconds on, two seconds off - Recycle.
• 1/2 second on, 1/2 second off - Lockout.
Cad Cell Resistance
Cad cell resistance can be checked without using an ohmmeter. During
the run mode, press and release the reset button. The resulting flashes
indicate the resistance. See Table 4.
Valve-on Delays / Blower Motor-off Delays
Select models may have fixed or selective delays for valve open or
blower motor off. The safety circuits will check for flame during these
delays and, if a flame is present, will switch the control to lockout.
Unitary Products Group
Simulate Ignition Failure:
1. Follow burner start-up, but do not open oil supply hand valve.
2. Observe that safety switch locks out approximately within the
selected time as indicated on the label. Indicator light flashes 1/2
second on, 1/2 second off. Ignition and motor stop and oil valve
closes.
MINNEAPOLIS, MN 55422
FOR T-STAT
DIAGNOSTIC LIGHT
CUT JUMPER
ON=FLAME
OFF = NO FLAME
FLASHING
(2 SEC. ON) = RECYCLE
ENVIRACOM
(1/2 SEC. ON) = LOCKOUT
PUSH RED BUTTON TO
RESET FROM LOCKOUT
ENVIRACOM
VALVE ON DELAY TIME: 15 SEC. (FIXED)
BURNER MOTOR OFF DELAY TIME: DELAY TIMES:
T
0 MIN 2 MIN 4 MIN 6 MIN
T
ALARM CONTACTS
Honeywell
by
R7184 X XXXXX
Interrupted Ignition Oil Primary Control
May be replaced by R7184A1000
WARNING
(WIRING
DIAGRAM)
Fire hazard! Electrical shock hazard!
Can cause severe burns! Can cause injury or death!
To prevent fire or spilling Disconnect power before
fuel oil, press red button servicing.
only once to reset. Call
local service company if
burner does not light.
US
C
RATINGS
120 VAC 60 HZ
BURNER 10 FLA* STAT 24 VAC
MOTOR 60 LRA LOAD 0.1 AMP
VALVE 1 AMP ALARM 30 VAC
IGNITOR 360 VA CONTACTS 2 AMP
*REDUCE BURNER MOTOR FLA RATING BY IGNITOR LOAD
LOCKOUT TIMING: 15 SECONDS
32005456-002 REV. A
FIGURE 11: Interrupted Electronic Oil Primary Control
DIRECT SPARK IGNITION SYSTEM
Do not attempt to light this furnace by hand (with a match or
any other means). There may be a potential shock hazard from
the components of the Ignition Transformer. The furnace can
only be lit automatically by its direct spark ignition system.

TROUBLESHOOTING AND MAINTENANCE

IMPORTANT: Due to the potential hazard of line voltage, only a trained,
experienced service technician should perform the troubleshooting pro-
cedures.
IMPORTANT: This control contains no field-serviceable parts. Do not
attempt to take it apart. Replace entire control if operation is not as
described.
To completely troubleshoot an oil burner installation, check the burner
and oil primary control for proper operation and condition.
The indicator light on the oil primary control provides lockout, recycle
and cad cell indications as follows:
1. Flashing at 1/2 second on, 1/2 second off: system is locked out or
in restricted mode.
2. Flashing at 2 seconds on, 2 seconds off: control is in recycle
mode.
3. On: cad cell is sensing flame.
4. Off: cad cell is not sensing flame.
Cad Cell Resistance Check
For proper operation, it is important that the cad cell resistance is below
1600 ohms. During a normal call for heat, once the control has entered
the run mode, press and release the reset button. See Table 4 for
equivalent cad cell resistance and Figure 12 for an example of the cad
cell resistance reading.
107273-UUM-C-0306
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