equipped with a reset button which must be pressed to restore normal burner operation. An open blocked vent switch is indicative of a problem with the vent system. If the blocked vent switch opens, the cause of the venting problem must be found and corrected by a qualified gas service technician before the blocked vent switch is reset.

Sequence of Operation - Water Boiler, Less Tankless Heater

1)When the boiler is energized, 24 volts is immediately applied to terminals “1” (blue) and “4” (yellow) on the vent damper. Assuming that there is no call for heat, and that the damper switch is in the “automatic” position, the damper (if used) will close.

2)A call for heat from the thermostat energizes relay coil 1R (the relay on the L8148E), causing contacts 1R1 and 1R2 to make. Contact 1R1 starts the circulator. Contact 1R2 sends power to the high limit.

3)Assuming that the high limit is made, current will flow to pin terminal #2 (orange) at the vent damper (if used) and the damper will open.

4)Once the vent damper is fully open, an end switch inside the damper will make, energizing pin #3 (red) at the damper. This pin is connected through the damper harness to terminal “B1” on the L8148E. At this point in the operating sequence, 24 volts is present across “B1” and “B2”.

5)Under normal conditions, the blocked vent switch is made. Voltage will therefore immediately appear across the “24V” and “24V (GND)” terminals on the ignition module.

6)Upon application of voltage across the “24V” and “24V (GND)” terminals, the ignition module will start an ignition spark at the pilot and apply 24 volts across the pilot valve (terminals “PV” and “MV/PV”).

7)Once the pilot is established, the pilot flame will act as a diode, converting the AC current at the electrode to a half wave DC current at the pilot’s ground strap. This DC current flows through the boiler to the “GND (BURNER)” connection on the ignition module. For the ignition module to recognize that a pilot flame is present, the DC current flowing into this ter- minal must be in excess of approximately 1.0 uA.

8)Once the ignition module detects the presence of a pilot flame, voltage is applied across the main valve (terminals “MV” and “MV/PV”), opening the valve and establishing main flame.

9)The way in which the ignition module handles failure to establish pilot or the loss of an already established pilot depends upon the exact ignition module supplied with the boiler. For more information on module operation, consult the ignition module instructions supplied with the boiler or the local Crown representative.

Sequence of Operation, Intermittent Ignition, With Tankless Heater

1)If the boiler water temperature is less than the low limit setting minus the differential setting, terminals “R” and “B” in the L8124E are made through the low limit switch. The low limit switching action is SPDT with “R” being common. “R” and “W” are therefore open whenever “R” and “B” are made. This means that while “R” and “B” are made relay coil R1 is deenergized, regardless of whether or not there is a call for heat. The circulator will therefore not operate if the boiler water temperature is too low to generate domestic hot water.

2)Assuming that the high limit is made, current will flow to terminal “B1” on the L8124E.

3)Under normal conditions, the blocked vent switch is made. Voltage will therefore immediately appear across the “24V” and “24V (GND)” terminals on the ignition module.

4)Upon application of voltage across the “24V” and “24V (GND)” terminals, the ignition module will start an ignition spark at the pilot and apply 24 volts across the pilot valve (terminals “PV” and “MV/PV”).

5)Once the pilot is established, the pilot flame will act as a diode, converting the AC current at the electrode to a half wave DC current at the pilot’s ground strap. This DC current flows through the boiler to the “GND (BURNER)” connection on the ignition module. For the ignition module to recognize that a pilot flame is present, the DC current flowing into this ter- minal must be in excess of approximately 1.0 uA.

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Crown Boiler 32-380ECS, 32-475ECS manual Sequence of Operation Water Boiler, Less Tankless Heater
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32-380ECS, 32-475ECS specifications

Crown Boiler is renowned for its innovative and reliable heating solutions, and its models 32-475ECS and 32-380ECS are prime examples of the company’s commitment to performance and efficiency. These residential and light commercial steam boilers are designed to deliver warmth and comfort while minimizing energy consumption, all within a robust and durable framework.

One of the standout features of the Crown Boiler 32-475ECS and 32-380ECS is their adaptability to various heating applications. These boilers are sized appropriately for numerous residential settings, providing heating solutions for homes of different dimensions and layouts. Their large heating capacities, rated at 475,000 BTUs/hour for the 32-475ECS and 380,000 BTUs/hour for the 32-380ECS, are suitable for larger spaces or buildings requiring significant heat output.

Both models utilize a fire-tube design, which promotes efficient heat transfer and helps conserve fuel. This design leads to improved thermal efficiency compared to traditional designs, making them an environmentally-friendly choice for homeowners concerned about carbon footprints. Additionally, the units feature advanced natural gas burners that enhance combustion efficiency, ensuring that less fuel is consumed to achieve the desired heating level.

The Crown Boiler models also come equipped with various safety features, including a pressure relief valve and low water cutoff, which help to ensure safe and reliable operation during the boiler's lifecycle. The combination of these safety mechanisms with robust construction materials ensures long-lasting performance even under demanding conditions.

Furthermore, the 32-475ECS and 32-380ECS are designed for ease of installation and maintenance. They feature a user-friendly control system, allowing homeowners and technicians to monitor performance and make necessary adjustments easily. The serviceability of these units is enhanced by their compact design, which can save space in mechanical rooms and facilitate troubleshooting.

In summary, the Crown Boiler 32-475ECS and 32-380ECS represent an exceptional choice for those seeking efficient, reliable, and safe heating solutions. With their powerful heating capacities, advanced technology, and thoughtful design, these models exemplify Crown Boiler's dedication to quality and innovation in the heating industry. Whether for residential or light commercial use, these boilers provide the performance and efficiency that modern buildings demand.
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