ACL- 3500 - Industrial Burner Controller, (Local Control)

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DESCRIPTION

The ACL 3500 provides low cost ignition, flame fail and shutdown capabilities for gas fired heaters.

 

ACL 3500 (12/24 VDC)/(120 VAC) Specifications

ACL 3500 12/24 VDC
Voltage	12-24 VDC
Current	.204/.102 amps
Power	2.45 watts
Operating temperature	-40 C to 60 C
Flame signal current	1 micro amp minimum
Flame failure response time	0.8 seconds maximum
Spark rate	30 sparks/second
ACL 3500 120 VAC
Voltage	120/240 VAC
Current	1.05 amps
Power	12.75 watts
Frequency	50/60 Hertz
Operating temperature	-40 C to 60 C
Flame signal current	1 micro amp minimum
Flame failure response time	0.8 seconds maximum
Spark rate	30 sparks/second

Simple Design

• No programming necessary
• Two button operation (Stop & Start)
• New innovative design allows ignition and flame fail with the use of one flame rod
• Control and ignition components are all housed in the Nema 4x enclosure control box
• Easily installed into any burner.

Features

• Simple to use, no programming necessary
• Built in logic allows for automatic ignition & re-light, shutdown interlocks, run status.
• Versatile power supply 9-30 VDC, 120 VAC 50/60 Hz. & Solar
• Fastest flame out response time of 0.8 seconds
• CSA approved for Class 1, Div 2 lo-cation
• CSA approved C22.2 No 199-M89. Combustion safety controls and solid-state Ignitors for Gas & Oil burning equipment.
• CSA B149.3 Compatible.
• Nema 4x enclosure, corrosion resistant and weatherproof.

Technical Features

• Provides safe ignition and flame monitoring for gas fired heaters.
• 12-24 VDC
• 120 VAC option available.
• CSA Class 1 Div 2
• CSA C22.2 No 199-M89
• Solid state ignition delivers 30 sparks per second.
• Flame rod technology utilized to sense flame, ignition resumes immediately upon loss of flame

Operation

The ACL-3500 utilizes a single ignitor/flame rod to provide both flame acknowledgement and ignition at the burner tip. When the ACL-3500 starts its ignition sequence, fuel gas travels to the burner tip where the ignitor/flame rod is located and sparking. Once the gas is lit, the flame becomes a current path for the ignitor/flame rod for flame acknowledgement and the unit stops sparking. If this flame is extinguished, the current path is broken and the ignitor/flame rod starts sparking within 1 second.

Controller Mounting

The ACL-3500 can be mounted in a Class 1 Div 2 area, usually close to the burner. The maximum recommended length of ignition lead is 10' (supplied) and can be run free air. Note: Lead lengths in excess of 10'or use of metal or metallic sheathed conduit may result in a diminished ignitor rod voltage. A ground wire (also supplied) must be connected between the ground lug on the burner assembly and the bonding ground terminal on the main circuit board. If the controller must be mounted farther away from the burner assembly, the ignition module, which is mounted on the main circuit board, may be mounted in or near the burner housing using the optional, CSA approved, ACL5000R remote mount kit.

Power Connections

The ACL-3500 is available in 12-24 VDC or an optional 120 VAC. Voltage requirements must be specified when ordering. The supply voltage of each unit is clearly marked inside the door on the speci-fication label and on the circuit board beside its respective terminal. Incorrect polarity on 12-24 VDC units may result in damage to circuit board components. The terminal marked ground is for power sup¬ply or system ground and the terminal marked bonding ground is strictly for the ground wire to the burner assembly. It is important that a ground wire (supplied) be connected between the bonding ground terminal and the burner assembly to provide an uninterrupted path for the flame acknowledge¬ment current.

Solenoid Outputs

There are two solenoid output terminals on the main circuit board marked solenoid #1 and solenoid #2. The output voltage at these terminals is always the same as the controller supply voltage. The com¬bined power consumption of solenoids connected to a system should not exceed 12 watts for a 12 VDC unit, 24 watts for a 24 VDC unit and 30 watts for a 120 VAC unit. (ACL Manufacturing carries a line of Class I Div I extra low watt solenoid valves available in all three voltages.) Solenoid #1 output con¬nects to the pilot or low fire solenoid and is energized when a start is initiated. Solenoid #2, (main burner) energizes only after the pilot or low fire flame has been proven. The time delay between proof of flame and energizing of output #2 is factory set at 20 seconds and is adjustable with T1.

S/D Interlock

The shutdown interlock provides a means of connecting other shutdown devices such as low level or high temperature switches for additional protection. A jumper is installed at the factory and should only be removed to utilize this feature. Shutdown devices connected (in series) to the S/D interlock termi¬nals must be dry contacts and be in a closed state during normal operating conditions. If any of the S/D switches go to a fault condition, their contacts will open, de-energizing the solenoid output and shutting down fuel to the burner. The controller will attempt one 5 second re-light but will be unsuccessful and go into alarm. Once the fault condition is corrected the system can be restarted by pressing the stop/ reset and then the start buttons. Note: If a restart is attempted without clearing the fault condition the controller will again attempt a re-light, without energizing the solenoid output and will return to an alarm condition.

Proof of Closure (Optional)

This feature allows controller to use valves with proof of closure switches for valve status. When valve switch contacts are in an open state confirming the valve may be open, the controller will not start. The contacts must be closed in order for controller to start. Once start is initiated, the contacts from proof of closure switch can then change state.

Run Status

This output provides a run status of the controller. These contacts are a normally open set of dry con¬tacts when the controller is off or in alarm state. When the controller is running normally, these con¬tacts are closed.