Can’t Understand the Puzhe Water-Cooled Fresh Air Unit Wiring Diagram? First Get a Grip on Commercial Kitchen AC Comparison and Kitchen Makeup Air Systems
Introduction: What Are Water-Cooled Fresh Air Units and Kitchen Makeup Air Systems
A water-cooled fresh air unit is a device that uses the principle of water evaporation to absorb heat, cooling outdoor hot air before delivering it indoors. It is commonly used in commercial kitchen environments with high temperatures, heavy oil fumes, and high loads. A kitchen makeup air system refers to supplying treated fresh air into the kitchen to balance the air volume extracted by the exhaust system, preventing negative pressure from causing poor exhaust and backdraft at the stove burners. The Puzhe water-cooled fresh air unit wiring diagram is one of the most frequently searched technical documents by contractors and owners during the installation phase, as it determines whether the equipment can start and stop properly, adjust speed, and coordinate with the exhaust system. Understanding the relationship between these three is the first step in solving kitchen high-temperature and ventilation problems.
I. The Core Logic of the Puzhe Water-Cooled Fresh Air Unit Wiring Diagram
1. What Problem Does the Wiring Diagram Actually Solve
The Puzhe water-cooled fresh air unit wiring diagram typically includes terminal definitions for power input, water pump control, fan speed control, water level protection, and fault alarms. Its core purpose is to make it clear to installers: which wire connects to 220V or 380V power, which wire controls the water pump start/stop, and which wire connects to a thermostat or building automation system. If the wiring is incorrect, at best the equipment won’t work, and at worst the motor or water pump will burn out.
2. Common Wiring Terminals and Function Descriptions
- L/N/PE: Main power input; PE is the ground wire and must be reliably grounded.
- PUMP: Water pump output, connected to a circulation pump or drain pump, controlled by the water level switch.
- FAN: Fan output; some models support three-speed or stepless speed control.
- COM/NO/NC: Interlock dry contacts, which can connect to fire protection, exhaust, or building automation systems.
- ALARM: Fault alarm output, connected to an audible and visual alarm or monitoring platform.
The key to understanding the Puzhe water-cooled fresh air unit wiring diagram is to distinguish between high voltage and low voltage, distinguish control wires from power wires, and strictly follow the manufacturer’s instructions. If you are not a professional electrician, it is recommended that a certified person perform the work to avoid safety hazards.
3. The Interconnection Between the Wiring Diagram and the Kitchen Makeup Air System
In a complete kitchen makeup air system, the water-cooled fresh air unit does not operate in isolation. It needs to interlock with the exhaust fan, oil fume purifier, and gas alarm. For example, when the exhaust fan starts, the makeup air unit should start simultaneously; when a gas leak alarm is triggered, the fresh air unit should automatically cut off and alarm. The interlock terminals in the Puzhe water-cooled fresh air unit wiring diagram are precisely the foundation for achieving these logic functions. Therefore, the wiring diagram is not just an electrical drawing but a microcosm of the entire kitchen makeup air system control strategy.
II. Commercial Kitchen AC Comparison: Water-Cooled Fresh Air Units vs. Traditional AC vs. Air-Cooled AC
1. Why Traditional Comfort AC Is Unsuitable for Commercial Kitchens
Traditional split or cabinet air conditioners often have a short life in commercial kitchens because the heavy oil fumes, high temperatures, and high humidity cause the condenser to become easily clogged with grease, sharply reducing cooling capacity. In addition, the negative pressure created by the kitchen exhaust system means the cold air is extracted before it even reaches the chef. Therefore, in commercial kitchen AC comparisons, traditional AC is usually the first to be eliminated.
2. Differences Between Air-Cooled AC and Evaporative Cooling AC
Air-cooled AC relies on a compressor for cooling, offering a large temperature drop but with high energy consumption, a large outdoor unit footprint, and a high failure rate in oily fume environments. Evaporative cooling AC (including water-cooled fresh air units) uses water evaporation to absorb heat, consuming only 1/5 to 1/3 of the energy of a compressor, and can introduce fresh air to improve kitchen air quality. In commercial kitchen AC comparisons, water-cooled fresh air units have clear advantages in energy savings, makeup air, and oil fume resistance, but their cooling capacity is limited in extremely humid regions.
3. Combination Solutions of Water-Cooled Fresh Air Units and Commercial Kitchen AC
In actual projects, common solutions include “water-cooled fresh air unit + workstation air supply” or a hybrid of “water-cooled fresh air unit + compressor-based AC.” The water-cooled fresh air unit handles overall makeup air and cooling, while the compressor-based AC provides precise cooling at key workstations. This controls both initial investment and operating costs while ensuring chef comfort. In commercial kitchen AC comparisons, there is no absolute best equipment—only the combination that best suits the local climate, kitchen load, and budget.
4. Brand Selection and Manufacturer Strength
There are many commercial kitchen AC brands on the market, and water-cooled fresh air unit manufacturers vary widely in quality. When choosing, focus on: whether they have mature kitchen makeup air system case studies, whether they provide detailed wiring diagrams and installation guidance, and whether they have after-sales service locations. LCCFAIR Lanchang, as a brand focused on commercial kitchen ventilation and cooling, has accumulated considerable engineering experience in water-cooled fresh air units and makeup air systems. Of course, brands like Puzhe also have their own technical characteristics, and it is advisable to compare multiple options based on project requirements.
III. Design Key Points and Common Misconceptions of Kitchen Makeup Air Systems
1. How to Calculate Makeup Air Volume
The makeup air volume of a kitchen makeup air system is typically designed at 70% to 90% of the exhaust volume. If the makeup air volume is too small, the kitchen negative pressure becomes excessive, causing poor exhaust and weak stove flames; if the makeup air volume is too large, oil fumes spill into the dining area, affecting the dining environment. The reasonable approach is to calculate the required makeup air volume based on the number of stoves, exhaust hood length, and exhaust fan air volume, then select the model and quantity of water-cooled fresh air units.
2. Makeup Air Inlet Location and Airflow Organization
The makeup air inlet should be far from the exhaust hood to prevent fresh air from being directly extracted. A common practice is to position the makeup air inlet behind or to the side of the chef, creating an airflow pattern of “fresh air from back to front, oil fumes from front to back.” If the makeup air inlet is poorly positioned, even the best-performing water-cooled fresh air unit won’t let the chef feel any coolness. Therefore, the design of the kitchen makeup air system must be coordinated with the kitchen layout, stove positions, and exhaust hood dimensions.
3. Common Misconception: Installing Only Exhaust Without Makeup Air
Many kitchens focus only on exhaust and neglect makeup air, resulting in a situation where the larger the exhaust fan, the more severe the negative pressure—doors can’t even be pulled open, and stove flames turn yellow and weak. The correct approach is to design and construct exhaust and makeup air simultaneously. As makeup air equipment, water-cooled fresh air units can both supply air and cool it, making them a core component of the kitchen makeup air system. LCCFAIR Lanchang has solved the dual challenges of negative pressure and high temperature in multiple commercial kitchen projects through proper configuration of water-cooled fresh air units.
4. Notes on Wiring Diagrams and Commissioning
Returning to the Puzhe water-cooled fresh air unit wiring diagram, during commissioning, pay attention to: whether the water pump rotation direction is correct, whether the water level switch is sensitive, whether the fan rotation direction matches the arrow, and whether the interlock signals are normal. After commissioning is complete, record operating current, supply air temperature, makeup air volume, and other parameters for future maintenance. If the wiring diagram is lost, contact the manufacturer to obtain one—do not guess the wiring based on experience.
IV. How to Choose the Right Commercial Kitchen AC and Water-Cooled Fresh Air Unit
1. Clarify Needs: Cooling Priority or Makeup Air Priority
If the main problem in the kitchen is high temperature, prioritize water-cooled fresh air units or evaporative cooling AC; if the main problem is negative pressure and poor exhaust, prioritize improving the kitchen makeup air system; if both problems exist, it is recommended to use a combination of water-cooled fresh air units and workstation AC. After clarifying needs, compare parameters and case studies from different manufacturers.
2. Evaluate Manufacturers: Case Studies, Drawings, After-Sales Service
When choosing a commercial kitchen AC manufacturer, don’t just look at price. Evaluate whether they have similar kitchen case studies, whether they provide detailed technical documentation at the level of a Puzhe water-cooled fresh air unit wiring diagram, and whether they offer installation guidance and after-sales training. Brands like LCCFAIR Lanchang are recognized by the market precisely because, beyond their products, they also provide systematic technical support and solutions.
3. Focus on Energy Efficiency and Long-Term Operating Costs
Commercial kitchen equipment operates for long hours, and electricity and water bills are long-term expenses. Although water-cooled fresh air units may have a slightly higher initial investment than ordinary fans, their low operating energy consumption and ability to reduce AC load often result in lower overall costs. In commercial kitchen AC comparisons, calculate the total cost of ownership over 3 to 5 years rather than just looking at the purchase price.
4. Convenience of Installation and Maintenance
The kitchen environment is harsh, and equipment requires regular cleaning, filter replacement, and water pump inspection. Choosing a water-cooled fresh air unit with a reasonable structure and easy maintenance can greatly reduce later operational pressure. Clear wiring diagrams, clearly labeled terminals, and complete manuals are also important indicators of a manufacturer’s professionalism.
Conclusion: System Thinking Is More Important Than Individual Equipment
Whether you are studying the Puzhe water-cooled fresh air unit wiring diagram or conducting a commercial kitchen AC comparison, you ultimately need to return to the overall design of the kitchen makeup air system. An efficient commercial kitchen ventilation and cooling solution requires the coordinated operation of four major subsystems: exhaust, makeup air, cooling, and control. It is hoped that this article helps you clarify your thinking and make wiser decisions in actual projects. If you are planning a kitchen renovation or new construction project, consider starting with the two fundamental aspects of makeup air volume and wiring diagrams, and gradually optimize the entire system.
