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Product Description
The SML Series Air-Cooled Glycol Chiller is a high-performance industrial chiller engineered by Chenxing Machinery for demanding low-temperature process cooling across plastics, electroplating, laser, food, pharmaceutical, and chemical industries. Utilizing 30% glycol solution as the circulating medium with a control range down to -5°C, this glycol chiller eliminates the need for cooling towers, water pumps, and complex piping — delivering a plug-and-play refrigerating machine that installs rapidly and operates reliably in facilities without accessible cooling water sources.
Nine standard models — from SML-7F through SML-15F — provide a cooling capacity range of 25,000 to 160,000 kcal/h, driven by US-manufactured Copeland hermetic scroll compressors (10–60 HP). Every unit is built around a fully enclosed stainless steel insulated water tank (250–1,200 L) with integrated circulation pump (10–50 m³/h), microcomputer centralized control, and a comprehensive multi-layer safety protection system. Premium international components — Emerson refrigeration accessories, Mitsubishi air switches, and Schneider electric parts — ensure long service life and consistent performance under continuous industrial duty.
For plastic processing plants operating extrusion lines, plastic pelletizers, WPC foam board extrusion lines, or PVC hot-cutting pelletizing lines, the SML Series provides stable mold and barrel cooling that directly impacts cycle time, dimensional accuracy, and scrap rate. For electroplating baths, laser resonators, fermentation vessels, reaction kettles, and MRI cold sources, its glycol-based low-temperature capability enables processes that water-cooled chillers cannot support.
All nine models share the following base parameters: Temperature control range: -5°C, Power supply: 380V–50Hz (3-phase), Refrigerant: R22 (R134a / R407c optional), Glycol concentration: 30%.
| Parameter | SML-7F | SML-8F | SML-9F | SML-10F | SML-11F | SML-12F | SML-13F | SML-14F | SML-15F |
|---|---|---|---|---|---|---|---|---|---|
| Cooling Capacity (kcal/h) | 25,000 | 30,000 | 40,000 | 50,000 | 60,000 | 80,000 | 100,000 | 120,000 | 160,000 |
| Compressor Power (HP) | 10 | 12 | 15 | 20 | 25 | 30 | 40 | 50 | 60 |
| Rated Current (A) | 38 | 40 | 45 | 55 | 75 | 100 | 125 | 150 | 200 |
| Tank Capacity (L) | 250 | 300 | 330 | 500 | 580 | 650 | 750 | 1,000 | 1,200 |
| Glycol Charge (L) | 80 | 100 | 110 | 150 | 180 | 200 | 250 | 300 | 400 |
| Circulation Pump Flow (m³/h) | 10 | 12 | 18 | 28 | 30 | 32 | 35 | 40 | 50 |
| Circulation Pump Power (kW) | 2.2 | 2.2 | 3 | 4 | 4 | 5.5 | 7.5 | 7.5 | 7.5 |
| Fan Power (kW) | 0.75×2 | 0.75×2 | 0.75×3 | 0.75×3 | 0.75×3 | 0.75×6 | 0.75×6 | 0.75×6 | 0.75×6 |
| Dimensions L×W×H (mm) | 1750×830×1650 | 1800×830×1650 | 1800×830×1750 | 2150×830×1750 | 2400×1000×1800 | 2450×1000×1950 | 2500×1000×2000 | 4300×1000×1950 | 4600×1350×2050 |
| Weight (kg) | 400 | 450 | 500 | 600 | 700 | 750 | 1,500 | 1,800 | 2,000 |
The SML Series circulates a 30% ethylene glycol-water mixture as the heat transfer medium, depressing the freezing point well below operating temperatures. This enables continuous -5°C chilled glycol delivery to the process load without risk of ice formation in the evaporator, pipes, or tank — a critical requirement for processes that demand below-ambient cooling in unheated factory environments, cold storage facilities, or outdoor installations. Unlike pure water systems that risk freeze damage during winter shutdowns, the glycol-charged SML chiller starts reliably in any season.
The integrated water tank is fabricated from stainless steel with full-enclosure construction and thermal insulation. This design achieves three objectives: (a) corrosion resistance against glycol mixtures and potential contaminants in industrial water circuits, extending tank service life; (b) hygienic integrity for food, beverage, and pharmaceutical applications where leachables or microbial growth in the cooling loop are unacceptable; and (c) reduced thermal loss through the tank walls, minimizing compressor cycling and energy consumption. The enclosed structure also prevents foreign object ingress and reduces glycol evaporation loss, keeping the circulating medium concentration stable over extended operation.
The SML chiller rejects heat directly to ambient air through finned-tube condensers and axial fans, completely eliminating the need for cooling towers, condenser water pumps, makeup water lines, and chemical water treatment systems. For factory owners, this translates to: (a) zero cooling water consumption — a significant operating cost advantage in water-scarce regions or facilities with high water tariffs; (b) no cooling tower maintenance (descaling, biocide dosing, legionella risk management); (c) simplified installation — position the chiller, connect power and process piping, charge glycol, and start production; and (d) flexible placement — units can be relocated as production layouts change, unlike water-cooled chillers tied to fixed cooling tower positions.
Every SML chiller is built around a tier-one component chain: Copeland (Emerson) hermetic scroll compressor — the industry benchmark for reliability with compliance, axial, and radial compliance for liquid slug tolerance; Emerson refrigeration accessories — expansion valves, filter driers, sight glasses, and solenoid valves matched to the compressor for optimal superheat control; Mitsubishi air switches — main circuit protection with proven arc-extinguishing capability for 380V–50Hz industrial supplies; Schneider Electric components — contactors, overload relays, circuit breakers, and control relays from the global leader in industrial automation. This brand strategy ensures spare parts availability worldwide and reduces the total cost of ownership through extended service intervals.
A dedicated microcomputer controller serves as the brain of the SML chiller, continuously monitoring tank temperature, glycol flow rate, compressor discharge/suction pressure, and ambient conditions. The controller automatically: (a) stages the compressor on/off based on the difference between setpoint and actual tank temperature, maintaining precision within ±0.5°C; (b) sequences multiple fans for optimal condensing pressure across varying ambient temperatures; (c) logs fault history for diagnostic review; and (d) supports optional RS485/Modbus communication for integration with plant-wide SCADA or building management systems. Once commissioned, the SML chiller runs unattended — no operator intervention required beyond routine maintenance.
The SML Series incorporates eight distinct protection mechanisms, each linked to automatic shutdown and alarm indication:
| Protection | Trigger | Action |
|---|---|---|
| Phase Loss / Phase Sequence Alarm | Missing or reversed phase on 380V supply | Immediate shutdown; prevents motor burnout |
| Pump Overload Alarm | Circulation pump current exceeds rated value | Pump shutdown; protects winding insulation |
| Compressor Overload Alarm | Compressor motor current exceeds threshold | Compressor trips via internal thermal protector or external overload relay |
| Anti-Freeze Alarm | Tank temperature drops below safe threshold | Activates heater or circulates pump; prevents evaporator freeze rupture |
| High-Pressure Alarm | Condenser pressure exceeds safe limit | Compressor stops; prevents burst risk from blocked condenser or fan failure |
| Low-Pressure Alarm | Suction pressure drops below setpoint | Compressor stops; indicates refrigerant leak, clogged filter, or low charge |
| Low Water Flow Protection | Flow switch detects insufficient glycol circulation | Immediate shutdown; prevents evaporator ice formation and tube damage |
| Fan Delay Shutdown Protection | Compressor stops | Fans continue running for several minutes to purge residual condenser heat, extending component life |
The air-cooled condenser section employs multiple axial fans arranged for side-discharge airflow. Fan count scales with model size (2 to 6 units, each 0.75 kW), and the fan blades and shroud geometry are optimized to balance static pressure capability with noise reduction. The fan delay shutdown feature is particularly valuable in noise-sensitive installations — rather than stopping abruptly, fans ramp down gradually after the compressor cycles off, eliminating the sudden pressure equalization "thump" common in less sophisticated designs.
The SML Series operates on a vapor-compression refrigeration cycle coupled with a glycol secondary loop, as follows:
Step 1 — Compression: The Copeland scroll compressor draws low-pressure, low-temperature refrigerant gas from the evaporator and compresses it into a high-pressure, high-temperature gas. The scroll mechanism's continuous compression profile delivers smooth torque with lower vibration than reciprocating alternatives.
Step 2 — Condensation: The hot, high-pressure refrigerant gas flows into the air-cooled finned-tube condenser. Axial fans force ambient air across the copper-tube/aluminum-fin coil, removing heat and condensing the refrigerant into a high-pressure liquid. The side-discharge airflow path directs waste heat away from the chiller and adjacent equipment.
Step 3 — Expansion: The high-pressure liquid refrigerant passes through a thermostatic expansion valve (or capillary tube on smaller models), where a sudden pressure drop causes partial flashing. The refrigerant exits as a low-temperature, low-pressure liquid-vapor mixture, ready to absorb heat.
Step 4 — Evaporation & Glycol Cooling: The cold refrigerant flows through the evaporator (plate or shell-and-tube heat exchanger), absorbing heat from the 30% glycol solution circulating on the other side. The glycol temperature drops to the setpoint (as low as -5°C), and the refrigerant evaporates fully into a gas, returning to the compressor to repeat the cycle.
Step 5 — Glycol Delivery: The chilled glycol is pumped from the insulated stainless steel tank through the circulation pump to the process load — injection mold cooling channels, electroplating bath heat exchangers, laser resonator cold plates, fermentation jacket, or reactor coil. After absorbing process heat, the warmed glycol returns to the chiller tank for re-cooling, completing a closed loop with zero water consumption and zero effluent discharge.
Anti-Freeze Logic: During shutdown or in sub-zero ambient conditions, the microcomputer monitors tank temperature. If it approaches the glycol freezing point, the system either activates an electric immersion heater or runs the circulation pump to keep the glycol moving — preventing stagnation and localized freezing in the evaporator.
The SML Series glycol chiller is an ideal thermal management solution for plastics manufacturing facilities. For injection molding, chilled glycol at -5°C flowing through mold cooling channels accelerates cycle times by 15–30% compared to ambient water cooling, directly increasing throughput on high-cavitation molds. For extrusion lines — whether pipe extrusion producing PVC, HDPE, or PPR pipes, or WPC foam board extrusion forming composite decking and wall panels — precise glycol temperature control in calibrators and sizing tanks ensures dimensional stability and surface finish consistency. Downstream equipment such as plastic pelletizers, plastic crushers, disc grinding pulverizers, and plastic grinding machines also benefit from glycol cooling to prevent thermal degradation of heat-sensitive materials during size reduction. Auxiliary equipment in the plastics value chain — high-speed mixers for PVC compounding, vibrating screens for powder classification, and screw feeders for material handling — can also be served by the SML chiller as part of a centralized cooling system. For complete plastic recycling solutions, pairing the SML chiller with PVC hot-cutting pelletizing lines ensures recycled granule quality through controlled strand cooling.
Electroplating bath temperature directly determines deposit quality — hardness, brightness, throwing power, and adhesion. The SML chiller maintains electrolyte solutions (acid copper, nickel, chrome, zinc, anodizing) at optimal temperatures (often 18–25°C) by circulating chilled glycol through titanium or stainless steel immersion coils. Glycol media eliminates the corrosion risk that water would pose to heat exchanger surfaces in aggressive chemical environments. For hard chrome plating and anodizing, where bath temperatures can spike from high current densities, the chiller's rapid pull-down capability prevents "burning" defects.
Industrial laser resonators — CO₂ lasers for cutting/welding, fiber lasers for marking/engraving, diode lasers for medical applications — generate significant waste heat that must be removed to maintain stable wavelength output and beam quality. The SML chiller provides precise glycol cooling (±0.5°C) to laser cold plates and optical bench assemblies, preventing thermal drift that degrades cutting accuracy and spot size consistency. Its compact, self-contained air-cooled design suits laser machine enclosures where floor space is limited.
Glycol cooling is widely used in food processing for: fermentation tank temperature control (brewing, yogurt, enzyme production), jacketed kettle cooling (sauce, confectionery, dairy processing), pasteurization tunnel cooling, and cold storage humidity control. The SML chiller's stainless steel tank and closed glycol loop meet hygienic requirements, with no open water reservoirs that risk bacterial growth. The 30% glycol solution is food-grade compatible (propylene glycol option available on request) for incidental contact applications.
For reaction kettle cooling in exothermic chemical synthesis, the SML chiller removes heat at a controlled rate to prevent runaway reactions. In crystallization processes, precise low-temperature control determines crystal size distribution and polymorph purity — critical for active pharmaceutical ingredient (API) manufacturing. The chiller's multi-layer protection (high/low pressure, flow, phase monitoring) aligns with the safety requirements of chemical processing environments.
MRI magnets require stable cryogenic cooling; the SML chiller can serve as a secondary cooling loop for helium compressor heat rejection. Blood analyzers, laser surgical systems, and laboratory environmental chambers all depend on reliable chilled glycol circulation for temperature stability. The microcomputer controller's RS485 communication option enables integration with building management systems for centralized monitoring in hospital and research facility settings.
Chenxing Machinery, headquartered in Zhangjiagang City, Jiangsu Province, is a specialized manufacturer with over 20 years of engineering heritage in plastics and industrial processing equipment. We hold ISO and CE certifications, with products exported to North America, Europe, Southeast Asia, the Middle East, Africa, and South America.
Factory-Direct Manufacturing: Every SML chiller is built in our own CNC-equipped assembly workshops, with strict production control, in-house quality inspection, and factory acceptance testing before shipment. No intermediaries — you receive direct factory pricing and direct technical support.
Complete Ecosystem: Unlike standalone chiller suppliers, Chenxing manufactures a full range of upstream and downstream equipment — from high-speed mixers and plastic crushers to extrusion lines, pelletizing lines, disc grinding pulverizers, vibrating screens, and screw feeders. A single-source supplier simplifies commissioning, spare parts logistics, and after-sales service.
Global Support: Remote commissioning via video call, optional on-site technician dispatch for installation and operator training, and lifetime technical support are standard. Spare parts ship same-day from our comprehensive inventory.
Custom Engineering: Tank volume, pump head/flow, compressor brand (Copeland standard; Bitzer or Hanbell available), refrigerant type, control system features (PLC upgrade, Modbus/RS485, remote monitoring), and voltage/frequency can be configured per order — not limited to catalog specifications.
The SML Series is configured for 30% ethylene glycol by default, which provides freeze protection to approximately -15°C — a safe margin above the -5°C operating setpoint. Propylene glycol is available on request for food, beverage, and pharmaceutical applications where incidental contact with product is possible. Note that propylene glycol has slightly lower heat transfer efficiency and higher viscosity at low temperatures compared to ethylene glycol; our engineering team will adjust pump sizing and heat exchanger surface area accordingly when quoting a propylene glycol configuration. Never use automotive antifreeze, which contains silicate and phosphate corrosion inhibitors incompatible with industrial chiller materials.
Model selection depends on three primary factors: (a) Process heat load — calculate the total heat rejection from your equipment (for injection molding: shot weight and cycle time; for electroplating: rectifier kW and bath volume; for laser: resonator rated power). (b) Required glycol supply temperature — the SML Series delivers -5°C standard; if you need warmer glycol (e.g., +10°C for fermentation cooling), the effective cooling capacity increases, and a smaller model may suffice. (c) Required glycol flow rate and pressure — match your process piping, heat exchanger, and manifold specifications to the circulation pump curves. Contact our engineering team with these parameters, and we will recommend the optimal SML model with a detailed technical proposal within 24 hours.
Yes, provided the installation location meets several requirements: (a) Ambient temperature range: the chiller is designed for -10°C to +43°C ambient; outside this range, consult for special configuration (crankcase heater upgrade, fan speed control, larger condenser). (b) Weather protection: install a canopy or shelter to prevent direct rain/snow ingress into electrical enclosures and fan openings; maintain minimum 1.5 m clearance on all sides for airflow. (c) Foundation: a flat concrete pad with vibration isolation pads (supplied) is recommended. For outdoor installations in regions with winter temperatures below -10°C, we recommend an electric tank heater option to maintain glycol temperature above freezing during idle periods.
Routine maintenance is minimal and can be performed by on-site maintenance staff: (a) Monthly: Inspect condenser fins for dust/debris accumulation; clean with compressed air or soft brush if airflow appears restricted. Check glycol level in the tank and top up with pre-mixed 30% glycol solution if needed. (b) Quarterly: Verify circulation pump mechanical seal integrity (look for drip at pump shaft). Inspect electrical connections for tightness and signs of overheating. Test the operation of all alarm functions (simulate low flow by partially closing a valve). (c) Annually: Have a qualified refrigeration technician check refrigerant charge, compressor oil condition, expansion valve superheat setting, and condenser fan bearings. Replace the filter drier. Chenxing provides a detailed maintenance manual with each chiller and can supply spare parts kits tailored to your model.
Chenxing Machinery provides a 12-month warranty from the date of shipment (or 18 months from shipment for the compressor, whichever occurs first), covering manufacturing defects in materials and workmanship. During the warranty period, replacement parts are supplied free of charge; on-site labor for warranty repairs is provided at cost. After the warranty period, we offer: lifetime technical support via phone/email/video call, same-day spare parts dispatch from our Zhangjiagang inventory, remote commissioning and troubleshooting via video call, and optional on-site service engineer dispatch for major repairs, upgrades, or operator training. Our after-sales team responds to all technical inquiries within one business day.
Yes. The SML chiller can be incorporated into existing chilled glycol distribution loops as an additional or replacement cooling source. The microcomputer controller provides potential-free alarm contacts (dry contacts) for remote fault indication, and an RS485/Modbus RTU communication interface is available as an option for integration with PLC, SCADA, or BMS platforms. For factories with a centralized monitoring system, the chiller can report tank temperature, compressor running status, alarm codes, and accumulated run hours — enabling predictive maintenance scheduling. Our engineering team can provide the Modbus register map and assist your automation integrator with communication setup.
Tell us your process details: industry and application (injection molding, electroplating, laser, food, chemical, medical, laboratory), required glycol supply temperature, estimated heat load (kcal/h, kW, or RT), and any special constraints (available floor space, outdoor installation, noise limits, food-grade glycol requirement).
Our engineering team evaluates your parameters and provides a configuration recommendation — optimal SML model, tank/pump sizing, refrigerant type, electrical specification, optional features (PLC upgrade, remote monitoring, custom voltage) — with a detailed commercial quotation, typically within 24 business hours.
After order confirmation with deposit (T/T or L/C at sight), production begins. Standard lead time is 4–8 weeks depending on model and customization. We provide weekly production progress updates with photos/video. A factory acceptance test (FAT) is conducted before shipment — you are welcome to witness it in person at our Zhangjiagang facility or via live video.
The chiller is packed in seaworthy export crate and shipped FOB Shanghai or CIF to your port. Upon arrival, our engineer provides remote video guidance for installation, glycol charging, and commissioning — or travels to your site for hands-on setup and operator training. Your team achieves independent operation at rated capacity typically within 1–2 days after power-on.
| Channel | Detail |
|---|---|
| Phone WhatsApp WeChat | +86 159 5118 7228 |
| ceo@cxsljx.com | |
| Company | Zhangjiagang Chenxing Machinery Co., Ltd. |
| Website | www.chenxingmachinery.com |
We respond to all inquiries within one business day. For urgent requests, WhatsApp message typically receives a reply within 2 hours during China business hours (UTC+8, 08:00–18:00).
