We customize all types unit coolers ( evaporator unit, indoor unit) with different sizes, fin spacings and materials, fan diameter is 300~800 mm or even more, contact us for more details.
Unit cooler is also called evaporator unit, cold room indoor unit, is an essential refrigeration equipment for Cold Room.
It included 6 important components: Evaporator coil & fin, cooling and heating exchange pipeline, axial flow fan, liquid separator, defroster, and water tray.
It relies on the axial flow fan forcing the air (in the cold room) to flow through the cooling exhaust pipe of heat exchange aiming to cool the air, finally reduce the cold room temperature and keep it stable.
For small and medium cold rooms with side air supply.
Suitable for fresh storage, beverage rooms, dairy rooms, and freezer rooms.
Application: Small to medium cold rooms
Room temperature: +15°C to -25°C
Fin spacing: 4.0–9.0mm
Defrost: Electric defrost
Configuration: Single or dual fan, optional stainless steel casing
Buyer concerns: Air coverage, drain layout, service space
Common risks: Fast frosting, blocked return air, uneven cooling
Ideal for projects requiring overhead installation.
Suitable for cold rooms with limited wall space and clear aisle requirements.
Application: Chiller rooms, freezer rooms, storage rooms
Room temperature: +15°C to -25°C
Fin spacing: 4.0–9.0mm
Defrost: Electric defrost
Configuration: Compact structure, multi-fan design, double water tray optional
Buyer concerns: Hanging space, maintenance access, drain piping
Common risks: Difficult servicing, poor drainage, limited airflow coverage
For longer air throw and directed airflow.
Suitable for long cold rooms and projects with higher air distribution requirements.
Application: Long rooms, narrow rooms, special airflow projects
Room temperature: +15°C to -25°C
Fin spacing: 4.5–9.0mm
Defrost: Electric defrost
Configuration: Air nozzle design, customized fan and coil options
Buyer concerns: Air throw distance, airflow direction, room layout match
Common risks: Direct air blow, uneven temperature, local drying
For special layouts and large airflow demand.
Suitable for industrial cold rooms and customized refrigeration projects.
Application: Large rooms, special projects, industrial cooling areas
Room temperature: +15°C to -45°C
Fin spacing: 6.0–12.0mm
Defrost: Electric defrost or hot gas defrost
Configuration: Double air outlet, large airflow, optional explosion-proof motor
Buyer concerns: Floor space, drainage, protection, easy cleaning
Common risks: Collision damage, water accumulation, maintenance inconvenience
To recommend the right unit cooler, please share the following project details.
Casing Printing
Evaporator Processing
Finished Product
Assembling
Fin color is optional: Bule, golden, and natural.
Depending on the ambient temperature, unit cooler will use different fin spacings.
Commonly used fin spacings for unit coolers are 4mm, 4.5mm, 6~9mm, 10mm, 12mm, and 16mm.
The lower the cold room temperature, the larger the fin spacing. Incorrect fin spacing means the fin frosting speed will be fast, which will quickly block the air passage, and making it difficult to cool the cold room. Meanwhile , result in the compressor inefficiently and increasing the power consumption of the whole refrigeration system.
#1. Medium / High temp cold room (-15℃~+15℃)
Such as workshop, shady storage, fresh storage, air conditioning storage, ripening storage, etc., the fin spacing should be 4mm or 4.5mm.
#2. Low temp cold room (-18°C~-25°C)
Such as low-temperature freezer, low-temperature logistics warehouse, the fin spacing should be 6mm~9mm.
#3.Blast freezr cold room (-25℃~-45℃)
Fin spacing is generally 10mm~12mm. If the humidity of the quick-frozen goods is high, had better select the unit cooler with variable fin spacing, and the fin spacing on the air inlet side can be 16mm.
Note: In some occasions, Can’t select the fin spacing simply by temperature, such as the frequency in/out of stored items (such as meat, fish, seafood and vegetables,etc), so please Contact Our Salesman for unique solution.
# Array ways of unit cooler coil
There are 2 array ways of unit cooler : cross and positive.
In same cooling area and wind speed, the heat transfer efficiency of cross array is better than positive array; However, the cross array produces more resistance when the air flows than the positive array. When use the same fan, the heat exchanger air volume of cross array is smaller than positive array.
At same heat exchange area, if the coil arrangement is different, the products’ heat exchange volume is different.
Inner-grooved Copper Tube
Cross Array
Positive Array
#1. Incorrect installation Position
If unit cooler installed above the Cold Room Door. Once you open the door, the hot air outside the cold room is directly sucked into the inside of the unit cooler, and the water vapor is also condensed on the cooler housing and the fan grille.
#2. Higher relative humidity (RH)
The cold room door will frequently open and close when discharge the goods. Because the door is long time opened resulting in the continuous intrusion of huge external hot air into the cold room.
#3. Incomplete defrosting
Due to the insufficient defrosting time and the unreasonable position of the defrosting reset probe, the evaporator will be turned on when the defrosting is incomplete, and the partial frost layer of the evaporator will become icing after several cycles finally become larger and larger.
Stainless Steel Evaporator
#1. Manual defrositing
Pay attention to safety first during the manual defrosting process, do not damage the refrigeration equipment (coil, fin).
#2. Water defrosting
Pouring water on the evaporator surface, then the temperature of the evaporator rises, forcing the frost attached to the evaporator surface to melt. This way is carried outside the evaporator, so must treat well the waterflow in the process to avoid affecting the normal use of the refrigeration equipment.
#3. Electric heating defrosting
Install electric heating tubes or heating wires inside the unit cooler fins to defrost by the current thermal effect. This way can intelligently control the defrosting through a micro-computer controller, which can greatly reduce labor time and cost.
Electric Heat Defrost Wire (Red Arrow)
#4. Thermal fluid defrosting
Use refrigerant vapor (with higher temperature) discharged from the compressor to enter the evaporator after passing through the oil separator, meanwhile use the released heat when the thermal fluid is condensed to melt the frost on the evaporator.
Control box line color :
Red is “5”
Yellow is “7”
Green is “8”
Blue is “9”
Brown is “10”
Black is “12”
Attention: The colors only demonstrate how to connect different terminals properly, not cables’ color.
Outdoor unit: Cold room Condensing Unit circuit diagram
Indoor unit: Cold room Unit Cooler (evaporator) circuit diagram
Attention: For original whole diagram, please Contact Us freely.
Do you know how to select the correct unit cooler cooling capacity for your cold room?
The load per cubic meter (m³) is calculated as 75W
#1. If cold room Volume < 30m³, multiply by factor A=1.2
For example: Cold room volume is 20m³, so you need to choose unit cooler cooling capacity: 20 x 75 x 1.2=1,800W
#2.If 30m³≤Volume<100m³, multiply by factor A=1.1
#3. If Volume≥100m³, multiply the factor A=1.0
The load per cubic meter (m³) is calculated as 70W
#1. If cold room Volume < 30m³, multiply by factor A=1.2
For example: Cold room volume is 20m³, so you need to choose unit cooler cooling capacity: 20 x 70 x 1.2=1,680W
#2.If 30m³≤Volume<100m³, multiply by factor A=1.1
#3. If Volume≥100m³, multiply the factor A=1.0
No worry, our cooling capacity tonnage calculator will help you !
# Installation Rules:
1. Airflow should cover the entire cold room.
2. Forbidden to install the unit cooler above the door.
3. Aisles and shelves shouldn’t block the passage of air supply & return air.
4. The piping distance from the unit cooler to the compressor (condensing unit) should be the shortest.
5. Keep the distance to the drain pipe the shortest.
# Installation distance:
“S1” – The distance between the wall and the unit cooler coil is >500mm.
“S2” – For ease of maintenance, the distance from the wall to the terminal plate shall be >400mm.
A) Preferred Position
B) The 2nd choice, because the air outlet is facing the door
C) Preferred Position
D) The 2nd choice, same like B)
All unit coolers can’t be installed on the same side wall !
(1) Preferred Position
(2) The 2nd choice, because the air may collide each other or affect the defrosting effect
#1.Size
The size of unit cooler should be appropriate for the cold room size. It’s important to choose a unit cooler that can effectively cool the entire space.
#2.Capacity
The capacity of unit cooler should be sufficient for the cooling requirements of the cold room. This will depend on factors such as the cold room size, the temperature requirements, and the products being stored.
#3.Configuration
There are different configurations of unit coolers available, such as ceiling mounted, wall mounted, and floor mounted. The choice will depend on the layout of the cold room and the space available.
#4. Airflow
Unit cooler should have a high airflow rate to ensure proper cooling and temperature control. Unit cooler design should ensure the airflow is distributed evenly throughout the cold room.
#5. Efficiency
Unit cooler should be energy efficient to minimize operating costs. Look for features such as high-efficiency fan motors, low noise levels, and advanced controls that optimize energy use.
#6. Maintenance
Unit cooler should be easy to maintain, with accessible components for cleaning and replacement. Consider features such as removable panels, easy-to-clean coils, and corrosion-resistant materials.
#7. Durability
Unit cooler should be built to last, with robust materials and a reliable design. Look for features such as heavy-duty fan blades, corrosion-resistant coatings, and high-quality components.
#8. Brand and warranty
Choose a reputable brand with a good track record of quality and reliability. Make sure the unit cooler comes with a warranty that provides adequate protection against defects and malfunctions.
#1. Adopt European advanced technology, product performance is more scientific and superior.
#2. Unit cooler outer casing is made of electrostatically color steel, aluminum or stainless steel, which is anti-corrosion and rust-proof.
#3. Use internal threaded copper tubes, and special tube spacing & heat exchange technology to improve energy efficiency.
#4. The fin stamping equipment adopts international advanced molds, and no holes are reserved for places without electric heating pipes, which can improve the heat exchange size and reduces the wind resistance.
#5. The fin bottom is with a wind-shielding and water-receiving plate to prevent the wind from passing through the water tray, so that more wind can pass through the fin and obtain greater heat exchange.
#6. Our unit coolers provide effective temperature control, allowing for precise temperature management and preservation of products.
#7. With pressure gauge interface, which can detect the pressure and adjust the performance of the evaporator in real time.
#8. With imported brand (optional) stainless steel electric heating tube to make the evaporator defrost quickly and efficiently.
#9. The drip water tray can be swivelled open for easy inspection and maintenance.
#10. Our unit cooler is compact design, safe and reliable in structure, saves space, and significantly reduces the amount of refrigerant. Medium and large size unit coolers have supporting legs for easy transportation and on-site hoisting.
Frequently Asked Questions About Unit Cooler
Please send us your room size, target room temperature, product type, incoming product temperature, refrigerant, power supply, and preferred installation type. Our team will recommend a suitable model based on your project conditions.
For faster quotation, please provide room dimensions, room temperature, product type, refrigerant, voltage, installation type, and any special requirements such as corrosion protection, low noise, or custom size.
Speedway is committed to quality across all aspects of our business – our people, processes and products. We call this ‘the SPEEDWAY standard’.
We welcome any sample order before big quantity purchase, that means 1pc is acceptable. More than 20pcs we will give discount.
We offer wall mounted, ceiling mounted, wall mounted with nozzle, and floor mounted unit coolers for different cold room layouts and airflow requirements.
We have own factory to produce the main refrigeration products, but we also do trading for other related products because we have resource to supply good quality and service.
We can provide manual defrost, electric defrost, or hot gas defrost solutions, depending on the room temperature, humidity level, and project requirements.
Yes,we have 3 senior engineers, 10 professional r & D team, 55 professional production personnel.
We support payment through wire transfer, like T/T, L/C, Western Union. Also accpet Paypal payment for sample piece order.
Yes. We support OEM and ODM customization, including dimensions, fan quantity, fan diameter, fin spacing, casing material, coil design, voltage, and defrost configuration.
Yes. We can match different refrigerants R404/290/448/449/507a and power supply standards based on your market and system requirements. Please confirm the refrigerant type, voltage, phase, and frequency before production.
Each unit cooler will be tested before shipment. Quality control can include pressure testing, leakage inspection, electrical checking, and final appearance inspection.
Yes. We provide technical support, spare parts supply, and product assistance for replacement and maintenance after delivery.
The lifespan of a unit cooler can vary depending on factors such as the quality of the unit, operating conditions, and maintenance practices. Generally, with proper installation and regular maintenance, unit cooler can last anywhere 10 ~ 20 years or more.
First, we need starting the business to understand each other, if things move smoothly and you meet our “distributor request”, then we will sign the formal contract and agreement to ensure your rights in your market.
Contact our salesman for more details please.
Partner with us to increase your brand reputation, get an impressive experience for your clients to remember you lifelong, and help you stand out in the competitive market !
We customize the superior refrigeration products based on your idea or suggestion since 2010
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