Honeywell 05701-A-0302

• Standard Industrial Alias: 24VDC Direct Current Gas Valve Electromagnet Coil for Industrial Burners & Gas Combustion Systems
• Product Affiliation: Honeywell 05701-A Series solenoid coil standardized product lineage

2. Product Brief Introduction

• This component is a factory-calibrated electromagnet drive coil exclusively designed to mate with Honeywell matched gas shutoff solenoid valve main valve bodies, delivering fixed electromagnetic suction force to drive valve core mechanical opening and closing actions for gas pipeline on-off control.
• The coil converts rated DC input electrical energy into stable alternating magnetic field, directly acting on the valve armature inside matched solenoid valve to complete full stroke valve switching under rated operating voltage; it integrates internal overheat protection circuit and winding insulation isolation structure for continuous cyclic switching application.
• It complies with global combustion equipment safety certification standards, supporting continuous long-term energized holding operation and frequent short-cycle on-off switching working mode, applied as core executing component for natural gas, liquefied petroleum gas, coal gas pipeline safety cut-off control inside industrial combustion and heating systems.
• Strict dimensional tolerance control enables full interchangeability with same-series Honeywell original valve accessories and certified third-party matching valve bodies that follow Honeywell 05701-A installation dimensional specification.

3. Complete Technical Specifications

3.1 Electrical Power Parameter

• Rated Nominal Operating Voltage: 24 VDC
• Allowable continuous input voltage tolerance range: 21.6 VDC ~ 26.4 VDC (±10% of rated voltage)
• Rated steady-state energized operating current: 0.38 A DC at 24VDC nominal input
• Nominal rated power consumption under full energized state: 9.12 W
• Insulation voltage withstand grade of internal winding: Class F (155℃ fixed thermal rating)
• Dielectric withstanding test voltage: 2000VAC / 50Hz applied between winding and metal housing for 60 seconds without breakdown

3.2 Electromagnetic Performance Spec

• Rated electromagnetic pull force under nominal voltage at standard ambient 25℃: 28N fixed design pull value
• Minimum guaranteed pull force at lower limit operating voltage 21.6VDC: 23N
• Coil internal inductance value at rated working condition: 185mH fixed factory parameter

3.3 Environmental Working Spec

• Continuous long-term operating ambient temperature range: -20 ℃ ~ +60 ℃
• Non-operational sealed storage temperature range: -40 ℃ ~ +85 ℃
• Applicable working relative humidity: 5% ~ 95% RH without surface condensation
• Working altitude without performance derating: ≤2000 meters above sea level
• Ingress protection rating of finished coil assembly: IP54 under fully assembled with matching valve housing

3.4 Physical Dimension & Weight Spec

• Overall outer outline dimension: 42.2mm (Outer Diameter) × 56.5mm (Total Height)
• Central inner through-hole mounting bore diameter: 16.1mm fixed standard size for valve stem penetration
• Single unit net weight without wiring terminals: 182 g

4. Core Function Features

1. Fixed-value electromagnetic driving function: Converts specified 24VDC input power into constant magnetic field to realize reliable valve armature pull-in and holding, completing gas pipeline circuit opening; power cut triggers magnetic field disappearance to release armature for automatic valve closing via built-in valve spring force.
2. Built-in embedded thermal overload protection: Internal thermal fuse fixed inside winding structure cuts off coil circuit permanently once winding temperature exceeds 155℃ to prevent coil burnout and peripheral fire hazard caused by overheating.
3. Integrated multi-layer insulation isolation structure: Multi-stage epoxy impregnation between copper winding layers eliminates inter-turn short-circuit risk under long-time continuous energized running.
4. Standard unified mechanical interface: Central fixed inner hole follows Honeywell unified mounting dimension to realize direct replacement on all matched 05701-A series solenoid valve assemblies without mechanical modification.
5. Fixed lead outgoing wiring structure: Preinstalled two fixed outgoing connection leads for direct terminal wiring, eliminating additional intermediate terminal transformation requirement during field installation.
6. Cyclic durability design: Structurally optimized winding layout supports over 1 million mechanical on-off switching cycles without performance attenuation under rated operating condition.

5. Detailed Performance Parameters

• Winding DC resistance value measured at 25℃ standard ambient: 63.2 Ω fixed nominal resistance tolerance ±3%
• Full pull-in response time after rated voltage input: ≤35ms
• Full release closing time after input power cut-off: ≤22ms
• Maximum allowable continuous uninterrupted energized working duration: Unlimited under rated ambient and rated input voltage condition
• Inter-turn insulation resistance of finished coil: ≥1000MΩ measured at 500VDC megohmmeter test

6. Material Composition Details

6.1 Outer Enclosure & Mechanical Housing Material

• Outer protective casing: Cold rolled low-carbon steel sheet with black electrostatic anti-rust epoxy spray coating, anti-corrosion and mechanical impact resistance
• End fixed plastic baffle: UL94-V0 flame retardant modified PA66 nylon engineering plastic

6.2 Internal Core Component Raw Material

• Electromagnetic winding conductor: High-purity enameled copper wire with double-layer polyimide high-temperature resistant insulating paint film
• Central magnetic core skeleton: Glass fiber reinforced PBT flame retardant plastic framework
• Internal thermal protection component: Organic thermal cutoff fuse rated 155℃ fixed breaking temperature
• Encapsulation filling material: High-temperature resistant epoxy resin for full vacuum impregnation and fixed encapsulation of winding space
• External outgoing lead wire: Silicone rubber insulated high-temperature resistant stranded copper control wire

7. Structural Feature Description

1. Concentric cylindrical overall structural layout: Central hollow through hole for valve armature penetration, surrounding annular fixed copper winding encapsulated by solid epoxy filling layer, external wrapped metal protective shell for mechanical protection.
2. Axial two-section separation design: Upper plastic positioning end cap fixes outgoing wire outlet position, lower metal cylindrical shell wraps full winding body to form closed magnetic circuit peripheral shielding structure.
3. Fixed built-in wire outgoing channel: Preformed sealed wire outlet on upper plastic end cap to prevent external dust and moisture penetrating into internal winding cavity.
4. Internal fully sealed encapsulation structure: Entire copper winding immersed and fixed by vacuum poured epoxy resin with zero internal air gap to avoid damp-induced insulation degradation.
5. Standard coaxial mounting design: Central bore keeps strict concentricity tolerance with outer cylinder to ensure smooth armature reciprocating movement after installation on matched valve body.

8. Working Principle

1. Energization Excitation Stage: After 24VDC rated voltage is applied onto two outgoing leads of coil, DC current flows through internal enameled copper winding to generate closed annular electromagnetic magnetic field around central hollow bore of coil.
2. Magnetic Pull-In Stage: Generated magnetic field produces axial suction force on ferromagnetic armature of matched solenoid valve; suction overcomes preloaded valve spring elastic force to pull armature upward, driving valve spool to open internal gas flow channel and realize pipeline gas circulation.
3. Continuous Holding Stage: Rated input voltage maintains stable coil current and constant magnetic field, sustaining armature pull-in state to keep valve continuously open during full power supply period.
4. Power Cut Release Stage: When external control circuit disconnects 24VDC input power supply, winding current disappears instantly and magnetic field vanishes; compressed valve spring releases stored mechanical energy to push armature reset downward, driving valve spool to cut off gas flow passage for pipeline shutoff.
5. Overheat Protection Action Stage: Excessive abnormal current causes winding temperature to rise beyond 155℃; internal embedded thermal fuse breaks coil circuit permanently to stop current input, cutting magnetic field output and triggering valve automatic closing for system safety protection.

9. Product Advantage Highlights

1. High temperature resistant F-class insulation and epoxy full encapsulation design adapts high ambient temperature environment near industrial combustion burners without early insulation aging failure.
2. Fixed standard dimensional specification realizes direct interchange replacement with original Honeywell matching valve parts, reducing field spare part stocking varieties and equipment maintenance downtime.
3. Built-in independent thermal fuse protection eliminates coil overheating ignition risk under abnormal locked rotor or overvoltage operating fault, meeting global industrial gas combustion safety regulatory requirements.
4. Strict controlled winding resistance tolerance guarantees consistent pull force across all production batches to avoid inconsistent valve opening performance after component replacement.
5. IP54 outer protection structure prevents dust, splash water and slight corrosive gas erosion for long-term stable operation inside humid factory workshop environment.
6. High cycle mechanical fatigue structure supports frequent intermittent on-off working mode commonly used in automatic combustion temperature control systems.

10. Applicable Industry Scope

1. Industrial Thermal Energy Industry: Industrial gas-fired boiler burner gas safety shutoff valve drive assembly, hot air circulation furnace fuel pipeline cut-off control, industrial heat treatment furnace gas supply control system.
2. Petrochemical Processing Industry: Refining plant heating furnace fuel gas pipeline solenoid executing component, chemical reactor auxiliary heating gas supply cut-off equipment.
3. Food Processing Industry: Food baking tunnel oven natural gas supply valve drive part, food sterilization equipment combustion system safety shutoff control assembly.
4. HVAC Central Heating Industry: Large commercial building centralized gas heating boiler solenoid control core component, factory workshop independent gas heating unit pipeline cut-off accessory.
5. Glass & Ceramic Manufacturing Industry: Kiln combustion system gas inlet safety solenoid matching coil, glass melting furnace auxiliary fuel supply control assembly.

11. Model Series Classification

• Parent Product Series: Honeywell 05701-A full series solenoid drive coil product family
• 05701-A-0302 belongs to fixed 24VDC DC-powered standard specification variant of 05701-A subseries; sibling series models adopt different suffix codes to distinguish rated voltage grades including 12VDC, 110VAC, 220VAC specifications.
• All 05701-A serial coils share unified central mounting hole dimensional standard for compatible interchange with corresponding Honeywell solenoid valve body groups; incompatible with non-standard dimensional third-party valve assemblies outside Honeywell design specification.

12. Detailed Installation Requirements

1. Mounting fixed mode: Direct coaxial penetration installation of matched valve armature through coil central inner bore, rely on valve body prefabricated fixed nut to complete axial clamping fixation without extra independent fixing support parts.
2. Installation ambient restriction: Mounting position keeps minimum 150mm safety distance from open flame and high-temperature burner combustion zone to avoid direct radiant heat baking of coil outer housing.
3. Wiring standardized specification:
   • Coil lead connection wiring uses ≥0.75mm² cross-section insulated copper control wire; wire connection terminals complete crimp fixation and insulating wrapping after wiring finishing.
   • External control power circuit must configure independent fuse protection component rated 0.5A to limit abnormal overcurrent into coil loop.
4. Space clearance requirement: Reserve ≥20mm free surrounding clearance around coil outer cylinder for natural convection heat dissipation during continuous energized operation.
5. Installation position orientation: Forbid inverted upside-down mounting of finished coil assembly to avoid condensed water flowing into internal winding cavity via wire outlet.
6. Environmental cabinet requirement: Install related control components inside IP40 and above protection grade control cabinet for control power wiring arrangement.

13. Standard Use Precautions

1. Pre-installation inspection regulation: Measure coil DC resistance value with multimeter before installation; measured resistance must fall within 63.2Ω±3% tolerance range, reject damaged coil with open-circuit or short-circuit resistance reading for field mounting.
2. Power supply restriction: Strictly apply only rated 24VDC DC power input; AC alternating voltage and overvoltage beyond 26.4VDC upper limit are forbidden to access coil terminals.
3. Wiring operation specification: Complete power supply circuit cut-off before any coil lead wiring modification work to avoid accidental energization short-circuit damage.
4. Fault replacement regulation: Once internal thermal fuse triggers permanent open-circuit protection caused by overheat fault, whole coil assembly needs full replacement; internal disassembly and thermal fuse manual bypass repair are prohibited.
5. Spare part storage standard: Uninstalled spare coils store in dry constant-temperature warehouse within -10℃~+40℃ ambient with original factory packaging intact; high-humidity damp storage environment is forbidden to prevent winding insulation damp deterioration.
6. Long-term operation maintenance rule: Inspect lead wire insulation integrity and fixed connection tightness every six calendar months during continuous equipment running; wipe outer casing surface dust only with dry soft cloth, liquid cleaning solvent cannot contact coil plastic and metal shell surface.
7. Chemical environment restriction: Forbid long-term service of coil assembly in environment containing strong acid, strong alkali corrosive gas and volatile organic solvent vapor.