Ningguo Kingcool Import and Export Co., Ltd is a China-based supplier of refrigeration and appliance parts, combining our own metalized polypropylene film capacitor production with a broad agency range of air conditioner and refrigerator accessories. Within that range, our Microcomputer Temperature Control range covers digital refrigeration controllers used in cold rooms, display cabinets, condensing units and small cold-chain equipment.
We supply these controllers as part of a one-stop parts programme: the controller, the sensors, the defrost heater, the fan motor and the run capacitor can be configured together, so a single shipment supports a complete repair or production build.
What Our Microcomputer Temperature Control Range Covers
As a Refrigeration Parts-Microcomputer Temperature Control Manufacturers, we match product configuration to the application, operating limits, interfaces and acceptance criteria defined for each project.
Our microcomputer temperature controllers are digital panel instruments for refrigeration-only and combined refrigeration/defrost duty. The range is built around the ETC-512B style refrigeration controller with off-cycle defrost mode, and we configure variants for different sensor types, relay outputs and supply voltages.
- Refrigeration-only controllers — cabinet and cold-room control with compressor relay output and off-cycle defrost.
- Defrost controllers — timed or demand-based defrost with evaporator termination sensor and drip time.
- Dual-sensor versions — cabinet air sensor plus evaporator coil sensor for accurate defrost termination.
- Panel-mount and DIN-rail formats — for OEM cabinets, retrofit panels and service replacements.
Where These Controllers Fit
Microcomputer control is the practical choice wherever a mechanical defrost timer or bimetal thermostat cannot hold temperature closely enough or cannot protect the compressor. Typical applications we support include:
Commercial Cold Rooms
Walk-in chillers and freezers where defrost timing affects product quality and running cost.
Display Cabinets
Retail refrigeration with frequent door openings and tight temperature display requirements.
Condensing Units
Small and medium condensing units needing anti-short-cycle delay and alarm output.
Cold-Chain Equipment
Transport and storage equipment where supply voltage fluctuates and compressor protection matters.
Mechanical Timer vs. Microcomputer Control
The table below summarises the practical difference between a mechanical defrost timer and a microcomputer controller of the type we supply. It is a selection aid, not a claim about any specific third-party product.
| Feature | Mechanical Defrost Timer | Microcomputer Controller |
|---|---|---|
| Cycle trigger | Fixed clock interval | Variable, based on frost and coil temperature |
| Temperature precision | Coarse, typically ±2 °C | Finer, typically ±0.1 °C to ±0.5 °C |
| Defrost termination | Time only | Evaporator sensor plus drip time |
| Compressor protection | None | Anti-short-cycle delay |
| Alarms and logging | None | High/low temperature alarms, history |
Configuration Options We Build Around
Because our business model puts each employee directly in contact with the market, we handle fragmented and personalised requirements rather than forcing a single catalogue item. For microcomputer temperature control, the variables we confirm before quoting are:
- Supply voltage and frequency — 110 V, 220 V or 380 V, 50/60 Hz, matched to the destination grid.
- Sensor type and cable length — NTC or PTC probes, with lead length to suit panel-to-coil routing.
- Relay output rating — compressor, defrost heater, evaporator fan and alarm contacts sized to the load.
- Defrost mode — off-cycle, electric heater or hot gas, with termination temperature set point.
- Display and enclosure — panel cut-out dimensions, bezel colour and IP protection for the mounting environment.
- Parameter set — temperature range, differential, alarm limits and delay times locked to your specification.
Integration with the Rest of the Refrigeration System
A controller is only one node in the refrigeration circuit. We supply the surrounding parts from the same programme, which shortens the bill of materials and reduces the number of suppliers a project has to coordinate.
Related parts we supply alongside the controller:
- Capacitor — run and start capacitors for compressor and fan motors, including our own metalized polypropylene film types.
- Refrigeration Parts — axial fans, voltage protectors, condensate drain pumps, filter driers and control valves.
- Thermostat — mechanical and defrost thermostats for systems that do not require digital control.
For panel builders, the controller can be supplied with matching sensors, contactors and overload relays so the electrical assembly is consistent across a production run. For service distributors, the same items can be packed as a repair kit covering controller, probe and capacitor.
Quality Control and Acceptance
Our capacitor production runs on high-precision slitting and winding equipment with real-time testing, and the same quality discipline is applied to the parts we source and supply. Controllers are checked for display function, relay switching, sensor response and parameter retention before packing.
- Incoming inspection of controller batches against the agreed parameter set.
- Functional test of relay outputs under rated load.
- Sensor accuracy check at reference temperatures.
- Packing and label verification against the purchase order.
Where a project requires documented acceptance, we agree the test items and sampling plan with the customer before shipment so the inspection record matches the receiving inspection on site.
Installation, Maintenance and Spare Parts
Microcomputer controllers are panel-mounted instruments. Correct installation depends on keeping sensor leads away from mains cables, sealing the probe entry into the refrigerated space and setting the defrost termination temperature to suit the coil.
- Mounting — confirm panel cut-out and depth before ordering; DIN-rail versions need rail clearance inside the panel.
- Wiring — separate sensor wiring from compressor and heater feeds to avoid reading errors.
- Commissioning — set temperature range, differential, defrost interval, drip time and alarm limits, then record the values.
- Maintenance — check probe condition and terminal tightness at each service interval; replace probes rather than adjusting parameters to compensate for drift.
- Spares — we hold matching probes, capacitors and relays so a replacement controller can be installed without rewiring the panel.
Information We Use to Configure Your Solution
To prepare a suitable configuration and quotation, we work from the following project inputs. The more precisely these are defined, the closer the first proposal will be to the final specification.
| Input | What We Need | Why It Matters |
|---|---|---|
| Application | Cold room, display cabinet, condensing unit or transport unit | Determines defrost mode and output count |
| Electrical supply | Voltage, frequency, phase | Selects the correct controller variant |
| Temperature range | Working set point and alarm limits | Sets sensor type and parameter table |
| Loads | Compressor, heater and fan ratings | Sizes relay contacts and external contactors |
| Panel details | Cut-out size, bezel, IP rating | Ensures mechanical fit on site |
| Quantity and packing | Annual volume, kit or bulk packing | Defines production and delivery scope |
Frequently Asked Questions
How does microcomputer control protect the compressor?
The controller includes an anti-short-cycle delay, so after a power interruption or thermostat cut-out the compressor cannot restart against high head pressure. This protects the motor and the run capacitor, which is particularly relevant in regions where the supply is unstable.
Can you supply a complete repair kit rather than just the controller?
Yes. Because we carry refrigeration parts, capacitors, thermostats and fan motors in the same programme, we can pack a controller with its probe, a replacement capacitor and any related parts as a single kit. This reduces shipping cost and keeps service stock consistent.
Can the temperature range or relay configuration be customised?
Our agile business model is set up for personalised requirements. We can arrange custom temperature ranges, specific relay output configurations and parameter sets for heavy-duty evaporators, subject to the controller platform and the quantity involved.
What sensor types are available with the controllers?
We supply NTC and PTC probes in the lengths needed for panel-to-coil routing. The correct type is confirmed against the controller input specification and the required temperature range before the order is placed.
Do you provide documentation for installation and commissioning?
Controllers are supplied with wiring and parameter information covering terminal assignment, sensor connection, defrost settings and alarm configuration. Where a project needs a specific parameter table, we agree it before production so the delivered units match the site requirement.
Which markets do you currently serve?
Our products are exported to more than a dozen countries across the Middle East, Africa, South America and Southeast Asia. We support both OEM production and aftermarket distribution from our base in Ningguo, Anhui, China.
