Burnham 81433101R16-1/10 Control Operating Characteristics, LED Error Codes, Burner START-UP

After approximately 60 seconds without any key pressed, the display will enter a dim display mode. To return to the bright display mode, simply press any key.

2.Control Operating Characteristics

The L7248/L7224 can be in any three (3) operational states: Normal, High-Limit and Error. The controller moves back and forth from High- Limit to Normal state as part of normal operation.

The controller will enter the Error state when there is an abnormal condition. The operating states are:

a.Normal: Boiler temperature has gone below the high limit setting (minus the differential) and has not exceeded the high limit setting.

b.High-Limit: Boiler temperature has gone above the high limit setting and has not dropped below the high limit setting (minus the differential).

c.Error: The controller has detected an error condition (e.g., open sensor) and has shut down the burner output. The controller continues to monitor the system and automatically restarts if the error condition clears. See Table 4.

Table 4: LED Error Codes

Error Code	Cause/Action
Err1	Sensor fault; check sensor.
Err2	ECOM fault; check EnviraCom™ wiring.
Err3	Hardware fault’ replace control.

d.Low-Limit: Boiler temperature has gone below the low limit setting (minus the low limit differential) and has not gone above the low limit setting.

e.The operating sequence for L7248/L7224 is described below and shown in Table 5.

The switching action in the L7248/L7224 control has one setting, the high limit, see Figure 14. The switching relay is controlled by the low voltage room thermostat. On a call for heat, the relay contacts make to complete the line voltage circulator circuit and also the burner circuit if the boiler water temperature is below the high limit

Table 6: Beckett AFII Burner

Table 5: L7248/L7224 Controller

Operating Sequence

Action	System Response
Thermostat	Circulator starts.
calls for	Boiler temperature is checked. Burner
heat	restarts when the water temperature is
	below high limit setting.
Boiler	Burner is turned off. Burner restarts when
exceeds the	the water temperature drops below the
high limit	high limit setting minus the differential.
Thermostat	Circulator and burner turn off.
is satisfied
Error	If an error condition is detected, all outputs
condition	are shut down. Burner is off. Control
	continues to function and restarts when
	error is corrected.
	During the error check sequence, the
	system checks for drift in the sensor and
	corrosion in the connections.

setting. The high limit switch shuts off the burner if boiler water temperature exceeds the high limit setting. The circulator will continue to operate as long as the thermostat is calling for heat. The high limit automatically resets after the water temperature drops past the setpoint and through the differential.

F. BURNER START-UP

WARNING

Do not attempt to start the burner when excess oil has accumulated in the chamber, when boiler is full of vapor or when combustion chamber is very hot.

1.VERIFY burner settings.

a.Refer to Table 6 for Beckett Burner Settings. Refer to Table 6A for Riello BF Burner Settings.

b.Check electrodes to comply with dimensions shown in Figure 20A. For adjustment, loosen the electrode clamp screw and slide/rotate electrodes as needed. Securely re-tighten the clamp screw when finished.

Boiler	Firing Rate	Burner	Air Tube	Delavan		Settings
Model	(GPH)	Model	Combination	Nozzle	Air	Head	Pump Pressure
						(stop screw)	(PSIG)
LEDV1	0.60	AFII 85	HLX50HD	0.50 x 70°B	2.5	#2	140
LEDV2	1.00	AFII 150	HLX50HE	0.85 x 60°B	3.5	#3	140
LEDV3	1.25	AFII 150	HLX50HE	1.00 x 60°B	4.0	#5	140

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