WKLF090

Rooftop Air Conditioning Unit (English name: Rooftop Air Conditioning Unit) is a large and medium-sized integrated air conditioning equipment with its own cooling source and air cooling. Its refrigeration, heating, humidification, air supply, air purification, electrical control, etc. are assembled in a horizontal box. As it is mostly installed on the roof, it is called a rooftop air conditioning unit.
Roof mounted air conditioning unit is a large and medium-sized unit integrated unit, consisting of three sections: compression condensation section, evaporation filtration section, and air supply section. According to their functions, they can be divided into: single cooling type, electric heating type, constant temperature and humidity type, constant temperature and humidity clean type, heat pump type, etc.
The Zhongyou/Zhongyou rooftop air conditioning system is an all air system with an integrated design. It does not require supporting equipment such as water pumps, cooling towers, fan coil units, or condensate drainage pipes, making installation and use extremely convenient. The system has no moving machinery or water pipes indoors, so users do not need to worry about noise and water leakage, and maintenance is convenient. Roof mounted air conditioning units are placed on rooftops or outdoor open spaces, without the need for a computer room, saving initial investment. The unit does not require secondary refrigerant, and the system efficiency is high. The unit is fully functional and can easily achieve various functions such as air purification, dehumidification, humidification, cooling, heating, and fresh air volume adjustment. The unit is suitable for both shopping malls, catering, entertainment, office buildings, clubs, and general industrial workshops, as well as clean spaces in industrial workshops such as pharmaceuticals, food, electronics, chemicals, scientific research, and machinery.
The heating methods of rooftop air conditioning units include heat pump heating, electric heating, steam heating, hot water heating, gas heating, etc; Humidification methods: electrode humidification, dry steam humidification, electric heating humidification, high-pressure mist humidification, wet film humidification, etc. The unit can add a flow equalization section, a medium efficiency filtration section, a noise reduction section, and an air outlet section. Generally speaking, conventional units installed on rooftops are equipped with horizontal return air and horizontal supply air, including side return air and end supply air; End return air, end supply air; Other air supply and return methods: side return air, bottom supply air; Bottom return air, end supply air, etc.
The national standard for rooftop air conditioning units is GB/T20738-2006 "Rooftop Air Conditioning Units".
working principle:
Cooling mode:
The outdoor side fin heat exchanger serves as the condenser, while the indoor side fin heat exchanger serves as the evaporator. The high-temperature refrigerant gas discharged from the compressor is condensed into liquid in the outdoor side fin heat exchanger, and then throttled and depressurized by the expansion valve to form a low-temperature gas-liquid mixture. It then flows into the indoor side fin heat exchanger, absorbs heat, evaporates, and returns to the compressor, completing a refrigeration cycle; At the same time, the return air (or fresh air) from indoors is cooled and cooled by the indoor side fin heat exchanger (in this case, the evaporator), and the processed cold air is then sent into the room by the indoor side fan.
Heating mode:
The outdoor side fin heat exchanger serves as the evaporator, while the indoor side fin heat exchanger serves as the condenser. The high-temperature refrigerant gas discharged from the compressor is condensed into liquid in the indoor side fin heat exchanger, and then throttled and depressurized by the expansion valve to form a low-temperature gas mixture. It then flows into the outdoor side fin heat exchanger to absorb heat and evaporate before returning to the compressor, completing a refrigeration cycle; At the same time, the return air (or fresh air) from indoors is heated and heated by the indoor side fin heat exchanger (in this case, the condenser), and the processed hot air is then sent into the room by the indoor side fan.
Unit characteristics:
1. Wide applicability:
This series of products includes varieties such as constant humidity, cooling and heating, and heat pumps. Constant temperature and humidity units can meet high temperature and humidity requirements, cooling and heating units can meet comfort requirements, and heat pump units can be used in one machine to save heating operating costs.
2. Save investment:
The unit is placed on the roof or outdoor open space, without the need for a computer room, saving effective space. The unit does not require supporting equipment such as water pumps, cooling towers, fan coil units, etc., saving initial investment.
3. Easy installation:
The unit does not require on-site preparation of refrigerant pipes, cooling water pipes, air pipes, and power connections to be used, saving on-site construction time and costs.
4. Efficient and energy-saving:
High performance scroll or screw compressors are used for stable operation of the unit, with high volumetric efficiency and energy efficiency. The screw compressor can easily achieve four stage or stepless adjustment, and has high partial load efficiency; Expansion valves, filters, solenoid valves and other refrigeration accessories are all selected from imported brands such as the United States and Italy; The unit also does not require secondary refrigerant, resulting in high system efficiency.
5. Running quietly:
The unit adopts high-performance vortex or screw compressors, which operate smoothly. The unit is located outdoors and only requires air ducts indoors, resulting in low indoor noise.
6. Unique structure:
The top plate of the unit adopts a special structure to ensure that the unit does not enter water. The door panel is made of polyurethane foam to ensure thermal insulation performance. The electrical box adopts a sealed structure to ensure electrical safety. The power wiring is placed inside the electrical box, so there is no risk of roof leakage.
7. Safe operation:
The unit is equipped with high voltage, low voltage, overload, short circuit, phase failure, overheating, underwind pressure and other protections, as well as fire damper interlock protection.
8. Intelligent control:
The unit adopts advanced control instruments, which can be equipped with dual hand controllers and are located in the outdoor unit and indoor control room, making operation very convenient. The instrument is equipped with RS485 interface, which can achieve remote control.
Convenient function expansion:
The unit is equipped with multiple functional sections, which can conveniently achieve functions such as air cooling, dehumidification, heating, humidification, filtration, and fresh air exchange
WKLF090Technical parameters of rooftop air conditioning unit

model				WKLF090
Refrigeration capacity			kW	89.9
			kcal/h	77426
energy regulation			%	0, 50, 100
Heating capacity	electrical heating	power	kW	48
		energy regulation	%	0, 50, 100
	Hot water heating	Heating capacity	kW	85
		pipe diameter	mm	DN40
	Steam Heating	Heating capacity	kW	90
		pipe diameter	mm	DN40
Air volume			m3/h	15000
external static pressure			Pa	≥400
Temperature control range and accuracy			℃	18~32℃，±2℃
Power Supply				380V，50Hz， three-phase four-wire system
rated power	WKLFS/Z type		kW	33.7
	WKLFD type		kW	53.5
compressor	type			Fully enclosed vortex type
	Number of units			2
Evaporator and condenser types				Copper tube with aluminum fins
Supply fan	type			Double inlet centrifugal type (belt drive)
	power		kW	5.5
Condenser fan	type			Low noise axial flow type
	quantity			2
	power		kW	2.2
air filter				Plate initial effect/G4
cryogen	type			R22/407C
	Charge		kg	26
External dimensions	Universal type	long	mm	2750
		wide	mm	2200
		tall	mm	1920
	Basic functional type	long	mm	4400
		wide	mm	2200
		tall	mm	1920
weight	general use		kg	1650
	Basic type		kg	1870

Note:
1. Refrigeration nominal operating conditions: indoor return air dry bulb temperature of 27 ℃, wet bulb temperature of 19 ℃; The outdoor ambient air dry bulb temperature is 35 ℃.
2. Heating nominal operating conditions: indoor return air dry bulb temperature of 20 ℃, hot water inlet temperature of 90 ℃; The steam pressure is 0.2MPa.
3. Choose any heating method from electric heating, hot water heating, or steam heating; Hot water and steam heating require additional electric control valves.
4. When the unit is cooling, the ambient temperature should not be lower than 18 ℃. If there are any requirements, they should be clearly stated when ordering.
5. Specifications and parameters may not be notified separately due to product improvements or updates.
Configuration table of air-cooled direct expansion unit

Serial Number	Component Name	Origin/Brand
1	Fully enclosed compressor	Copeland/INVOTECH from the United States
2	finned cooler	self-control
3	Axial flow fan	Hangzhou Micro Light/Suzhou Ripple
4	Finned evaporator	self-made
5	centrifugal fan	Zhangjiagang Yingdeli/Wandi Lai
6	electric machinery	Siemens Beide
7	expansion valve	Danish Danfoss/American Emerson
8	Filter core	Blue Blue/Parker HPEOK
9	Pressure controller	Fengshen
10	air filter	Wuxi Yuqi Environmental Protection Purification Equipment Co., Ltd
11	Anti cold bridge frame	aluminum alloy
12	panel	Exterior color steel plate, interior galvanized plate, with polyurethane insulation sandwiched in between
13	Electrical control components	AC contactor	Chint Electric
		Circuit breaker	Chint Electric
		connecting terminal	Phoenix
		controller	Bang Pu/Deep Blue