Preliminary steps, Check oil primary control, Warning – Honeywell R7184A User Manual
Page 5: Cad cell resistance check
R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
5
69-1233—2
1.
Flashing at 1 Hz (1/2 second on, 1/2 second off):
system is locked out or in restricted mode.
2.
Flashing at 1/4 Hz (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.
Fig. 8. Switch settings for burner-off delay times.
Table 2. Switch Settings and Delays.
X = Don’t Care.
+ = S-3 not provided on R7184P models.
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. Indicator light will flash 1 to
4 flashes. See Table 3 for equivalent cad cell resistance.
Table 3. Cad cell resistance when sensing flame.
Preliminary Steps
1.
Check wiring connections and power supply.
2.
Make sure power is on to the controls.
3.
Make sure limit control is closed.
4.
Check contacts between ignitor and the
electrodes.
5.
Check the oil pump pressure.
6.
Check the piping to the oil tank.
7.
Check the oil nozzle, oil supply and oil filter.
Check Oil Primary Control
If the trouble is not in the burner or ignition hardware,
check the oil primary control by using the following
equipment:
1.
Screwdriver.
2.
Voltmeter (0 to 150 Vac).
3.
Insulated jumper wire with both ends stripped.
WARNING
Electrical Shock Hazard.
Can cause serious injury or death.
Troubleshoot with the system powered. Be
careful to observe all precautions to prevent
electrical shock or equipment damage.
Refer to Table 4 for further troubleshooting
information.
0 MIN.
2 MIN.
4 MIN.
6 MIN.
M17535
(SHADED AREA IS SWITCH HANDLE POSITION)
1
2
1
2
1
ON
ON
ON
ON
2
1
2
ENABLED
DISABLED
3
3
VALVE ON DELAY TIME: 15 SEC. (FIXED)
DELAY TIMES:
BURNER MOTOR OFF DELAY TIME:
Delay Timings
DIP Switch Settings
Valve-On
Delay
(seconds)
Burner Motor-Off Delay
(minutes)
S-1
S-2
S-3 Enable/Disable
R7184U
R7184P
R7184U
R7184P
0
0
—
X
X
Off
+
15
0
0.5
Off
Off
On
+
15
2
2
Off On
On
+
15
4
4
On
Off
On
+
15
6
8
On On
On
+
Flashes
Cad Cell Resistance in ohms
1
Less than 400
2
More than400 and less than 800
3
More than 800 and less than 1600
4
More than 1600 and less than 5000