24V Solenoid Coil for HVAC
Product Description: 24V Solenoid Coil for HVAC and Refrigeration Systems (φ19mm × H50mm) The 24V solenoid coil from Flying Bull is a reliable electromagnetic component designed for use with solenoid valves in HVAC and refrigeration control systems. Featuring a 19mm inner diameter and a height of 50mm, this coil is compatible with standard valve bodies, making it an ideal replacement or repair part for air conditioning units, refrigerators, heat pump systems, and other refrigeration equipment. It provides consistent electromagnetic actuation for precise refrigerant flow control. Built for Continuous Duty and Harsh Conditions This coil is constructed with Class F insulation, rated for operation up to 155°C. This high-temperature rating, combined with its suitability for continuous duty, ensures reliable performance even in the demanding thermal environments of HVAC systems. The coil is equipped with a standard three-plug (DIN) connector for easy and secure electrical installation, facilitating quick replacement by technicians. It is designed to operate with standard refrigerants and compatible fluids. Understanding Coil Failure and Prevention Like all solenoid coils, this 24V model is susceptible to failure if not properly maintained. A common cause of burnout is the plunger failing to close completely. When energized, an AC (or universal) solenoid draws a high "surge current" to pull the plunger in. Once closed, the current drops to a lower "holding current." If the plunger is blocked—for example, by contamination or a mechanical jam—the coil continues to draw the high surge current. The resulting heat can quickly exceed the coil's dissipation capacity, burning the insulation and causing a short circuit. This condition, often caused by dirt or debris entering the valve (known as "silt lock"), means that simply replacing the coil is not a permanent fix. The underlying contamination in the valve must be addressed. Quality Assurance and Supply This solenoid coil is supplied as a 100% brand-new unit, manufactured in Zhejiang, China, and backed by a 1‑year warranty. Delivery takes 5–7 working days. For HVAC technicians and maintenance teams, this coil offers a reliable, drop-in replacement solution to restore proper refrigerant control and system efficiency.
Product Introduction
Argument: φ: 19mm H: 50mm |
Media: Oil |
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Warranty: 1 YEAR |
Condition: New, 100% Brand-new |
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Place of Origin: Zhejiang, China |
Actuator: Electric |
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Brand Name: FLYING BULL |
Quality: High-Quality |
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Delivery: 5-7 Working Days |
Link mode: Three-plug |
Common causes of damage to Hydraulic Solenoid Valve Coil
In a coil, the resistance or impedance of the coil is when the solenoid is open (i.e. when the plunger is not present). As the plunger is pulled into the closed position, the impedance increases. Therefore, the current of the hydraulic AC solenoid valve is consumed when the solenoid valve is open (the plunger is withdrawn) and when the solenoid valve is closed (the plunger is inserted).
The high current consumption of an open-circuit AC solenoid is called surge current. The current consumed when the solenoid is closed is called the holding current. Ac solenoids can only emit the heat generated by the current they hold. This means that when the AC solenoid valve is energized, it is very important that the plunger is closed.
In other words, the heat generated by the high surge current exceeds the heat continuously emitted by the solenoid. Therefore, if the plunger cannot pull into its coil - for example due to a mechanical problem with the valve - the insulation around the hydraulic solenoid valve coil winding will burn out and the coil will short.
But what happens if the hydraulic valve prevents the electromagnetic plunger * from being pulled in? Well, pollution is a common reason. When hard or soft particles invade the gap between the spool and its hole, the solenoid may not have enough power to move the spool of the valve. This is often referred to as a "silt lock".
If the blockage lock is the problem, then replacing the solenoid valve is a waste of time. Replacing the entire valve takes some time - until it too becomes "silt locked". The solution, of course, is to control pollution.
Company Introduction
Frequently Asked Questions (FAQs)
1. What are the physical dimensions and key specifications of this solenoid coil?
The coil has an inner diameter of 19mm and a height of 50mm (φ19mm × H50mm). It operates on 24V and features a standard three-plug (DIN) connector for electrical connection.
2. What insulation class and temperature rating does this coil have?
The coil is constructed with Class F insulation, which is rated for a maximum operating temperature of 155°C. This makes it suitable for the high-temperature environments typical of HVAC and refrigeration systems and allows for continuous-duty operation.
3. What is the most common cause of failure for this type of solenoid coil?
The most common cause is the plunger failing to close completely. If the plunger is stuck (e.g., by dirt or a mechanical problem), the coil continues to draw a high "surge current" instead of dropping to the lower "holding current." This leads to overheating, burning the insulation, and causing a short circuit.
4. What is "silt lock" and how does it affect my solenoid valve?
"Silt lock" is a condition where hard or soft particles (contaminants) enter the tight clearance between the valve spool and its bore. This causes the spool to stick, preventing the plunger from pulling in fully. If you experience this, simply replacing the coil is not a lasting fix-the new coil will suffer the same fate. The solution is to clean the valve body and improve system filtration.
5. What should I do if my solenoid coil fails?
First, diagnose the root cause. If the plunger is stuck due to contamination, you must disassemble and clean the valve body or replace the entire valve assembly. Only replace the coil if the valve body and spool move freely and the issue is purely electrical (e.g., an open circuit or short in the coil windings). Always address system cleanliness to prevent repeat failures.
6. What warranty and delivery terms are offered for this coil?
The coil is 100% brand new and comes with a 1‑year warranty against manufacturing defects. Damage from contaminated fluid, mechanical jams, or electrical faults outside the coil is not covered. Delivery takes 5–7 working days from Zhejiang, China. Bulk orders and custom packaging options are available upon request.
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