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Rooftop Air Condition

Central Air Conditioners-Packaged Rooftop air conditioner

Model AC+W(R)F
Brand AC+
Unit set
Min order 1
Supply ability 100 sets/month
Payment 30% TT as deposit 70% before delivery
Port Chinese port
Certification ISO
Place China
Packaging Export standard packing
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   Central Air Conditioners-Packaged Rooftop air conditioner

1,What’s the central air condition-How does a central air condition system work

Central air conditioners remove heats of the air of an entire building through the use of a compressor, a condenser and evaporator, an expansion valve, and motorized fans. Central air conditioning units ia connected to air ducts that deliver cool air throughout the house, office, school or other structure. The popular belief about air conditioning is that it introduces cold air into a warm area when in reality it removes heat of the air, which makes it feel cooler. This is similar to evaporative cooling.
The components that make up central air conditioning units are made from metal such as aluminum or galvanized sheet because they are strong, durable and are able to dissipate heat well. Air conditioner manufacturers fabricate air conditioners in varying sizes; units range from the size of 3 ton/TR to 100 ton/TR. For residential buildings, the unit is usually placed beside the building; for industrial or commercial systems the units are on top of the roof. Central air conditioning units is used in buildings where fans or natural breezes are inadequate because of temperature, air disturbance or pollution. They are used in residential buildings, industrial plants, factories, businesses, vehicles and many other places where cool air creates a more comfortable environment.
The one of the most popular central air condition system is Rooftop Air Conditioner

2,What’s the rooftop air condition-How does a rooftop air condition system work

Rooftop air conditioning units has a thermostat that senses the current air temperature and when it reaches a aimed temperature, the unit turns on until the thermostat measures the air temperature at a lower level.  Rooftop units use the refrigerant that can change quickly from a gas to a liquid;

Freon is the most common refrigerant. This gas is contained inside coils within the body of the main unit. The compressor causes the refrigerant to change from cool gas to hot gas under pressure. As the gas runs through the coils, it condenses into a liquid as the heat dissipates. It is forced through the small opening of the expansion valve, which helps it evaporate back into a cold low-pressure gas. This gas runs through the coils to absorb heat from the air, cooling the space.

Rooftop A/C is more efficient than some other models such as a window mounted unit; it is able to cool the whole house. Like all air conditioning units and systems, central air requires electricity. If other measures are taken to reduce heat in the space such as keeping doors closed, using shades on windows and fixing insulation issues, the cost will be much lower.

It is easy to install because it’s packaged type all parts are in one body so we generally called it packaged rooftop air condition . Other similar central air conditioning systems such as  portable air conditioners, duct split air conditioner.

3, Typical installation diagram of packaged rooftop air condition


4, Why air-condition-plus brand rooftop air condition is your best supplier.
4.1 Air condition plus rooftop air condition introduction
Air condition plus (AC+) is one of Chinese largest manufacturers of reverse cycle packaged air conditioners.
The company has been supplying units to the commercial and industrial markets for over 20 years.
AC+’s mission is to provide the most competitively priced, reliable and efficient air conditioning equipment available to the international market.
AC+WRF/WF series units are single packaged units which are factory assembled, tested and shipped complete with compressor, evaporator and condenser coils, fans and controls, and these packages are designed for outdoor installation mainly, and indoor installation as optional.
And they may be used for cooling only or heat pump, and efficient both when heating and cooling.
The units are ideal for residential, commercial and industrial applications and are available in nominal cooling capacity from 9.9 to 188.5 kW also from 3 Ton/TR to 100 Ton/TR.
Quality design and construction make AC+ air-cooled rooftop package units with hermetic scroll compressors the preferred applications and easy installation and maintenance.
Operation range of outdoor temp. is from -10℃ to 50℃.

4.2 Air condition plus rooftop air condition Applications
Rooftop packaged systems are unobtrusive, quiet, and designed to provide year round comfort – warming in winter and cooling in summer. AC+'s wide product range offers a unit of performance capacity to suit small to large packaged air conditioner applications, e.g. offices, shops, motels, fast food outlets, restaurants, petrol stations, open plan office and work spaces, supermarkets, shopping malls and auditoriums.
Units are suited to high static pressure applications where large volume spaces are to be air conditioned. Long pipe and duct runs are possible enabling greater installation flexibility.
This range of units has been developed to meet the needs of typical applications. Should you have special requirements, such as higher air flows or greater sensible duty units contact your nearest AC+ representative. AC+ engineers have extensive experience in designing air conditioning equipment for specific applications.

5, Main Descriptions of rooftop air condition
5.1) Unit Description
A) Efficient. These reverse cycle (heat pump) air conditioners provide one of the most efficient forms of heating you can invest in. For every 1 kW of power consumed, up to 2.8 kW of heat is generated. For every 1 kW of power consumed, up to 3.1 kW of heat is generated. Each outdoor unit incorporates high efficiency scroll compressors. Heat exchange coils use high efficient tube for better heat transfer.
B) Performance. These systems have been designed and tested to perform in ambient conditions as low as -10°C and as high as 50°C. For the models from AC+W(R)F085 to AC+W(R)F600 belt drive fan motors are used to match the supply air requirements. The smaller units(models from AC+W(R)F035 to AC+W(R)F045) have 3 speed direct drive fans for adjusting air flows.
C) Durable. Our packaged systems are built tough to withstand all weathers. Their durable construction ensures a long life and excellent return on your investment. The outdoor air coils' aluminum fins are epoxy coated for extra protection in corrosive environments, e.g. salt laden sea air. Cabinets are constructed from high grade steel - polyester powder coated for all weather protection. External fasteners are stainless steel or galvanized type. Corrosion resistant drain trays are also included.
D) Insulation. Indoor air sections are generously insulated to reduce condensation and contain noise.
E) Safety. The refrigeration system includes a number of protection facilities, including: HP and LP switches, phase sequence relay, circuit breaker control etc.
F) Economy. Some models feature the flexibility and economy of 2~4 stages operation. Compressors are progressively switched on only as they are needed. This has the added advantage of lowering start-up current.
G) Economizer Option(free cooling system). If the outdoor air heat content or temperature is below that of the return air, a fresh air damper opens and the return air damper closes to provide the first stage of cooling. Operating costs are reduced as the compressor(s) will only operate to provide more cooling if it is required.
H) Fresh Air Introduction. An optional fresh air damper is available for most models. For applications using high proportions of fresh air (50%+) a hot gas bypass and HP fan speed controller are recommended and are available as options.
I) Peace of Mind. The manufacturer operates a quality management system that conforms to international standard like CE, ISO14001, ISO 9001:2000. AC+ products have been chosen, against worldwide competition, for use in some of the most exclusive projects — chosen because of their proven efficiency, durability, performance, reliability and value.
G) Easy service. Quick release fasteners are provided on electrical and compressor panel.
H) Quiet design. Apartments are provided on electrical and compressor section, low noise.

5.2) Components or Assembly Descriptions
A) Quiet operation
The packaged Rooftop series are basic constructed and engineered with noise reduction as a first consideration, low noise mounted fans are used, 15mm wave type acoustic Insulation for compressor section and compressors are mounted on vibration isolators.
B) Low Cost Installation
Units are factory assembled and pre-charged, with a single point electrical connection. On arrival to the job site they are ready to be lifted to their operating position through the lifting supports available on the units.
C) Capacities to Fit
There is a large production line of packaged units, with capacities ranging from 9.9 to 188.5kW for 50 Hz refrigeration tons at nominal conditions.
D) Casing
Heavy grade steel casing with polyester epoxy powder electrostatic oven-baked paint of coating finish, designed for outdoor installation with 10mm insulation for evaporator section only. All units are provided with an 8mm thickness aluminum frame filter that slides out or easy cleaning or replacement.
E) Compressor
The compressor used is hermetic refrigerant gas cooled, with internal thermal protection in each phase, scroll type. The terminal boxes are rain tight, starting is direct-on-line. With high efficiency, low sound, so as to match all other AC+ products’ reliability and efficiency.
F) Evaporator and Condenser Coils
The evaporator and condenser coils are designed to deliver their respective duties at optimum performance at all design conditions. Coils are manufactured from seamless copper tubes mechanically expanded into aluminum fins.  All coils are tested at 30kg/cm2  (450 Psi)  air pressure, under water to avoid leakage. They also undergo dry chemical cleaning after manufacturing for optimum system cleanness.
G) Direct Driven Condenser Axial Fans
All condenser fans are of the axial type, which are directly mounted on the motor shaft. All fans are selected for optimum efficiency and for maximum sound power reduction. Fan blades are made for maximum corrosion resistance, and are statically and dynamically balanced before Installation. AC+ tries its bests to ensure the low noise operation with high efficiency. All condenser fans are equipped with wire guards.
H) Condenser Fan Motor
All fans motors are of totally enclosed air-cooled, internal thermal current overload protected, with class “IP56” electrical insulation.
I) Belt Drive Evaporator Fan
Fans are of the centrifugal type that is designed for maximum efficiency for uniform air distribution. V－belt driven with variable pitch pulley as optional. All fans are statically and dynamically balanced to ensure quiet operation and smooth performance.
J) Evaporator Fan Motors
Motors are of the totally enclosed induction type, with fan motor assembly placed on a floating base with a flexible connection at the fan/casing interface. All fan motors of direct-driven are of the 3-speed type, highly efficient induction type motors, totally enclosed air-cooled, squirrel-cage type, internal thermal current protected and with class “B” insulation. Fan motors with V-belt-driven type are of 1 speed type.
K) Filters
All Models are provided with 8mm thickness aluminum frame filter (as standard features). Other filters are available upon request.
L) Drain Pan
All units are provided with a drain pan having drain connection from one side. The drain pan is painted galvanized steel type and insulated on the underside to prevent condensation.
M) Insulation
All units are internally lined with 10mm thermal insulation for coil and fan section (evaporator side only).
N) Easy Installation
The package rooftop has a compact design. It is supplied as a complete package ready for operation, with no extra controls or other items to be installed. The units have a single power point entry with simple connections. All units are designed to ensure maximum compliance with international standards.
Quick start-up is assured once installation is completed, as each rooftop unit is manufactured in an ISO9001:2000 listed facility to guarantee quality. All units are tested at the factory to provide reliable start up.
6,Standard Features
A）Standard features:
 
  1. Easily accessible system components.
  2. Ample space for easy access to power and control panels.
  3. Heavy duty mounting chassis for the whole unit with lifting holes.
  4. Anti-vibration mounting compressor.
  5. Weather-proof, polyester epoxy powder electrostatic paint oven-baked finish for sheet metal and base frame.
B）Electrical features:
1, Control and power panels include the direct-on-line starting contactors for the compressors and condenser fan motor.
2, Internal thermal motor protector for condenser and evaporator fan motor.
3, Compressor internal thermal protection.
4, Anti-recycling protection (time delay) for compressors through microprocessor.
5, Crank case heater for each compressor.
6, Control circuit breaker.
7, Microprocessor controller with the following main functions:
    Compressor lead-lag operation to ensure longer

C）Refrigeration features:
  1. High efficient Hermetic scroll compressor.
  2. Filter drier (for mod. 060 and above only).
  3. Charging points pin valve.
6) Optional Features
A）Construction options:
  1. Metal mesh on condenser section.
  2. Optional supply/return air configurations, optional bottom supply and return type.
  3. Evaporator with treated anti-corrosion protection for coils (blue fins)for copper/aluminum coils only.
  4. “25mm (1”)” or “50mm(2”)” thick flat filter.
  5. Economizer option with fresh, return and exhaust air dampers with cowl.
If this option is installed in the unit the unit has the ability to work with free cooling or free heating mode allowing it to exploit the external environmental condition as much as possible, since it avoids turning on the heaters and the compressors. This function can be achieved by controlling the opening/closing of the external air damper. With reference to the difference between the outdoor air temperature(std)/enthalpy and the indoor air temperature(std)/enthalpy.
 
  1. High Static condenser fan option will also required a sealed + drain condensing section.
  2. Upgraded Evaporator Fan Motor Drives.
  3. Electrical options:
 
  1. Power circuit breaker for each motor.
  2. Main power molded case circuit breaker for the whole unit (can also be available with an external handle as an option).
 
  1. Low ambient control:
    The refrigeration systems in all unit are inherently designed to operate efficiently, without extra controls or modifications. To permit the unit to operate in low ambient condition a head pressure control can be Installed either by:
 
    • ON/OFF condenser fans sequencing (for models with 2 condenser fans).
    • 3 speed of the condenser fan motor.
  2. Earth leakage relay for each compressor.
 
  1. Earth leakage relay for the whole unit.
  2. External overload relay for each motor.
  3. Power factor correction capacitor.
  4. Automatic or manual provision for pump down operation of each compressor stop.
 
  1. Building automation system interface. Interfacing with other building management systems can be Achieved by an optional card which can communicate with other devices using the serial communication port.
  2. Voltage monitor controller (phase sequence relay) for monitoring the main incoming power supply for the unit which provides protection from single-phasing, under-voltage, phase-voltage imbalance and phase-non-sequence.

Voltage monitor controller (phase sequence relay) for monitoring the main incoming power supply for the unit which provides protection from single-phasing, under-voltage, phase-voltage imbalance and phase-non-sequence.

C）Refrigeration options:
 
  1. Heat pump packaged unit with 4-way reversing valve, suction accumulator is a standard feature in heat pump option.
  2. Pressure gauges for each refrigeration circuit (high/low pressure gauges).
  3. Hot gas bypass (where low-local situation occurs and where it is necessary avoid low suction pressure and “compressor cycling”)
  4. Extra refrigerant accessories such as suction accumulators (for cooling units only), refrigerant liquid receivers, oil separators etc..
  5. Solenoid valve for heat pump mode.
  6. High and low pressure controller for models

7, REFRIGERANT PIPING DIAGRAM (Sample for reference only)



 
1 COMPRESSOR 7 SINGLE WAY VALVE
2 HIGH PRESSURE SWITCH 8 EXPANSION VALVE or CAPILLARY
3 REVERSING VALVE (HEATING MODEL ONLY) 9 SINGLE WAY VALVE
4 LOW PRESSURE SWITCH 10 EXPANSION VALVE  or CAPILLARY
5 PIN VALVE 11 FILTER
6 OIL SEPARATOR    







8, EXPLODED COMPONENTS VIEW (Sample for reference only)


9, TABLE OF GENERAL TECHNICAL DATA
 
  Model     AC+W(R)F   035 040 045 060 070 080 085 090
Cooling                  
Cooling capacity * kW 9.9 12 15.5 17.5 20.3 24 25.5 28.5
Total power input * kW 3.91 4.1 5.3 5.5 6.67 8.8 8.98 9.86
Heating                  
Heating capacity * kW 11.9 13.2 16.6 18.4 22.7 26.5 30.0 35.6
Total power input * kW 3.72 3.8 4.8 5.1 6.6 8.2 8.45 9.99
Compressors                  
Qty/refrigerant circuit Nr. 1/1 1/1 1/1 1/1 1/1 1/1 2/1 2/1
Energy control steps step 1 1 1 1 1 1 3 2
Air treatment section                  
Centrifugal fans number Nr. 1 1 1 1 1 1 1 1
Drive type / Direct Direct Direct Direct Direct Direct Belt Belt
Air flow m3/h 1800 2100 2600 3400 3600 4100 4500 5400
External static pressure Pa 100 100 100 100 200 200 250 200
Motor power kW 0.32 0.32 0.37 0.45 0.93 1.1 1.34 1.35
Condensation section                  
Axial fans number Nr. 1 1 1 1 1 1 1 1
Air flow m3/h 3961 4600 7800 7800 8641 9000 9434 9434
Motor power kW 0.17 0.25 0.37 0.37 0.41 0.55 0.55 0.55
Power supply / 380V/3N/50Hz
Net weight kg 240 240 260 290 402 420 461 461
Sound pressure level ** dB(A) 67 67 67 68 71 71 70 70


 
Model     W(R)F   095 100 120 130 150 170 200 240
Cooling                  
Cooling capacity * kW 30.3 32.4 35.6 41.6 47.2 53.2 63.3 71.4
Total power input * kW 11.3 10.44 12.3 13.7 17 19.5 22.8 26.7
Heating                  
Heating capacity * kW 33.3 37.6 40.5 48.2 50.2 56.4 67 75.6
Total power input * kW 10.4 10.65 11.3 13.14 15.6 18 21 24.8
Compressors                  
Qty/refrigerant circuit Nr. 2/2 2/1 2/2 2/2 2/1 2/1 2/1 2/1
Energy control steps step 2 2 2 3 2 2 2 2
Air treatment section                  
Centrifugal fans number Nr. 1 1 1 1 1 1 1 1
Drive type / Belt Belt Belt Belt Belt Belt Belt Belt
Air flow m3/h 5200 5200 6300 7020 7660 8500 10900 12500
External static pressure Pa 200 250 260 250 250 250 300 300
Motor power kW 1.5 1.5 2.2 2.73 3 3 4 4
Condensation section                  
Axial fans number Nr. 1 1 1 1 1 1 1 1
Air flow m3/h 12600 12600 12600 15600 16500 21000 21000 27000
Motor power kW 0.75 0.75 0.75 0.9 1.1 1.5 1.5 2.2
Power supply / 380V/3N/50Hz
Net weight kg 480 505 650 725 750 770 880 960
Sound pressure level ** dB(A) 72 72 72 72 75 75 75 75


 
Model     W(R)F   260 280 360 480 600 730 1040
Cooling                
Cooling capacity * kW 90 105.1 120 149 180 210 298
Total power input * kW 32.9 39.7 45.10 55.1 69.9 83 106.7
Heating                
Heating capacity * kW 96.2 113.2 128.3 159.2 192.5 226 318
Total power input * kW 30.4 36.7 41.70 51.5 64.8 77 100
Compressors                
Qty/refrigerant circuit Nr. 3/3 3/3 4/4 2/2 6/6 6/6 4/4
Energy control steps step 3 3 4 2 6 6 4
Air treatment section                
Centrifugal fans number Nr. 1 1 1 1 1 1 1
Drive type / Belt Belt Belt Belt Belt Belt Belt
Air flow m3/h 16000 19500 21000 26000 32000 38000 54000
External static pressure Pa 300 300 400 450 500 500 460
Motor power kW 5.5 5.5 7.5 11 15 15 18.5
Condensation section                
Axial fans number Nr. 2 2 2 2 4 4 4
Air flow m3/h 33000 42000 42000 54000 66000 84000 108000
Motor power kW 2x1.1 2x1.5 2x1.5 2x2.2 4x1.1 4x1.5 4x2.2
Power supply / 380V/3N/50Hz
Net weight kg 1160 1350 1710 1850 2180 2430 2860
Sound pressure level ** dB(A) 75 75 79 79 80 80 82

* Performance values refer to the following conditions: 
Cooling: room air temperature 27.0°C DB RH 50%, ambient air temperature 35°C; 
Heating: room air temperature 21.0°C DB, ambient air temperature 7°C DB / 6°C WB 
** Noise level measured by adopting average value in the noise lab with background noise of 25 dB(A), at a distance of 1.5m high fan speed.

10,Installation of rooftop air condition
1) INSTALLATION REQUIREMENTS
EQUIPMENT APPLICATION
Before beginning the installation, verify that the unit model is correct for the job. The unit model number is printed on the data label.
Charge Adjustment
As stated previously, the system is pre-charged. If further charge is required to be added, this can be done by CAREFULLY drawing LIQUID refrigerant only through the compressor suction pipe valve.
ELECTRICAL
All electrical work must be carried out by a qualified and licensed electrician. The installation must comply with the current relevant standards wiring rules and local authority requirements. Wire sizing is the responsibility of the installer, as it depends on the conditions and regulations applicable to each installation site. Refer to the electrical drawing and specification of the unit for the electrical data. The electrical installation requirements are generally as follows:
The air-conditioning unit shall be supplied directly from a distribution board through a mains lockable isolating switch.
Pre punched holes have been provided in the unit casing for the isolating switch. Do not drill into the cabinet as pipes may be located behind.
REQUIREMENTS AND CODES
The unit should be installed in accordance with all national and local codes and regulations which govern the installation of this type of equipment. In lieu of local codes, the equip­ment should be installed in accordance with National Electric Code, and in accordance with the recommendations made by the National Board of Fire Underwriters.
UNIT LOCATION
The electric unit is designed only for outdoor installations. Choosing the location of the unit should be based on minimizing the length of the supply ducts. Consideration should also be given to availability, service access, noise, and shade. The unit installation shall avoid areas where condensate drainage may cause problems.
CLEARANCES
The units require certain clearances for proper operation and service. Installer must make provisions for adequate ventilation air, normally 2000mm’s spaces all around the units. It’s required to place a anti wind/rain hood 2000mm above the unit.
A suitable air filter must be installed in the unit. This unit is supplied with air filters. Air filter(s) must be installed ahead of the evaporator coil of this unit.

2) UNIT INSTALLATION

GROUND LEVEL
If installing the unit at ground level, provide a concrete mounting pad separate from the building foundation. The pad must be level to ensure proper condensate disposal and strong enough to support the unit’s weight.
UNCONDITIONED SPACES
All ductwork passing through unconditioned spaces must be properly insulated to minimize duct losses and prevent condensation. Refer to local codes for any insulation material requirements.
RIGGING AND HOISTING
This unit is not designed to be handled with a fork-truck Exercise care when moving the unit. Rig the unit by attaching chain or cable slings to the holes provided in lifting lugs. Spreaders MUST be used across the top of the unit. Ensure the lifting equipment is adequate for the load. Keep the unit in an upright position at all times. The rigging must be located outside the units center of gravity. Lifting plates may be removed after installation. During lifting, make sure it horizontal and gradient should no tbe over 30°

Typical lifting arrangement:

　                                                    Drawing 1　　　　　　　　　　　　　         Drawing 2
MOUNTING
The unit should be fastened to a firm flat horizontal base plinth using the holes supplied in the mounting rails.
When the unit is being installed on a roof it is recommended that the unit is installed on a substantial structure with vibration isolating springs beneath the unit. These springs are not supplied with the unit. Three channels are provided under the base for spring mounts or bolting down.
Flexible duct connections are recommended between the supply and return ducts and the unit.
Condensate drain
A. Drain hose size should be suitable for the size of the drainpipe on the unit


B. If drain hose is fitted behind the trap, please make sure the drain hose has a incline of min 5 degree downwards
C. Min trap size:
A≥70（mm）； 
B≥2C
   C≥0.2*ESP (mm)

Trap normal 

11,Oeration of the rooftop air condition
CHECK TESTS
  1. Leave the on/off switch in the off position and close the mains isolating switch. A four hour delay period is required to allow the crankcase heaters to drive any liquid refrigerant out of the compressor oil.
  2. Check that the shipping blocks beneath each compressor have been removed and that each compressor is secure on its mounts.
  3. Check that all fan motors are free running.
  4. Check that the thermostat is correctly wired to the unit and is set at the desired temperature.
  5. Check that the air filters have been correctly installed if fitted.
  6. Check air diffuser dampers are open if appropriate.

START UP PROCEDURE

Use the supplied Commissioning Sheet to help you complete the following procedure:
  1. After the four hour delay period has expired, switch on the unit.
System 1's compressor will start straight away. System 2's compressor will start six minutes later due to the built in delay timer.
  1. Check the supply voltage between each phase and neutral.
  2. Compressors fitted are directional. Check for correct rotation. If rotation is incorrect the compressor will not pump, be noisy, and will draw minimal current. To correct motor rotation, change the phasing at the main power terminal.
  3. Measure the current draw on each phase to the compressor motors and measure the current draw of each fan motor. Check all readings against the specified values in the wiring diagram.
  4. Fit gauges and measure the suction and discharge pressures of both refrigeration circuits.
  5. Check that the outdoor air fan motors are running smoothly.
  6. Test the operation of the reversing valve by running the unit in both the heating and cooling mode.
  7. Check the indoor unit's fan belt tension after 20 mins of operation and adjust if necessary (refer Commissioning Sheet).
  8. Check the supply air flow at each outlet.
  9. Check the tightness of all electrical connections and sign the check label.
12, MAINTAINENCE AND SERIVE
MAINTENANCE
To ensure continuing high performance, and to minimize the possibility of premature equipment failure, periodic maintenance must be performed on the air conditioning equipment. The units should be inspected at least once each year by a qualified service person.
The minimum maintenance requirements for this equipment are as follows:
 
MAINTENANCE TIME SCHEDULE
Monthly   4. Check for excessive noise and vibration and correct as necessary.
1. Check air filters, Replace throwaway type filters when they become clogged with dust and lint or clean cleanable type filters monthly. 3. Check suction and discharge operating pressures. 5. Check fan and motor bearings and lubricate or replace as necessary.
2. Check condensate drain for free drainage. 4. Replace indoor air filters (if fitted). 6. Check for insulation and duct damage and repair as necessary.
3. Check compressor compartment for oil stains indicating refrigerant leaks. 5. Check condensate drain for free drainage. 7. Remove lint and dust accumulation from outdoor coil fins.
Three Monthly (or every 1200 hrs of operation)   8. Touch up any paintwork damage to prevent corrosion.
Check the indoor unit's fan belt tension and adjust if necessary. Yearly  Inspect outdoor coil. Clean when necessary.
Six Monthly 1. Check all refrigerant piping for chafing and vibration. Ensure that fan blades are clean and adequately balanced.
1. Check the tightness of electrical connections. 2. Check the operation of electric heaters, if fitted. Check refrigerant charge by measurement of superheat and sub cooling where necessary, adjust charge and TX valve to achieve optimum performance.
2. Check the tightness of all fans, motor mountings, pulleys and belt tension. 3. Check air supply at all diffusers.  Check the tightness of electrical connections.
13, Warranty
12-month Warranty - This Product is warranted to be free from defects in material and workmanship. If defect appears within 12 months from the date of original installation, whether or not actual use begins on that date, then the product does meet this warranty. A new or remanufactured part, at the manufacturer’s sole option, to replace any defective part will be provided without charge for the part itself; PROVIDED the defective part is returned to the distributor through a qualified servicing dealer.
THIS WARRANTY DOES NOT INCLUDE LABOR OR OTHER COSTS incurred for diagnosing, repairing, removing, installing, shipping, servicing or handling of either defective parts or replacement parts. Such costs may be covered by a separate warranty provided by the installer.
THIS WARRANTY APPLIES ONLY TO PRODUCTS IN THEIR ORIGINAL INSTALLATION LOCATION AND BECOMES VOID UPON REINSTALLATION.
LIMITATIONS OF WARRANTIES – ALL IMPLIED WARRANTIES (INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY) ARE HEREBY LIMITED IN DURATION TO THE PERIOD FOR WHICH THE LIMITED WARRANTY IS GIVEN. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE MAY NOT APPLY TO YOU. THE EXPRESSED WARRANTIES MADE IN THIS WARRANTY ARE EXCLUSIVE AND MANY NOT BE ALTERED,
ENLARGED, OR CHANGED BY ANY DISTRIBUTOR, DEALER, OR OTHER PERSON
WHATSOEVER.
ALL WORK UNDER THE TERMS OF THIS WARRANTY SHALL BE PERFORMED DURING NORMAL WORKING HOURS. ALL REPLACEMENT PARTS, WHETHER NEW OR REMANUFACTURED, ASSUME AS THEIR WARRANTY PERIOD ONLY THE REMAINING TIME PERIOD OF THIS WARRANTY.
THE MANUFACTURER WILL NOT BE RESPONSIBLE FOR:
1. Normal maintenance as outlined in the installation and servicing instructions or owners manual including filter cleaning and/or replacement and lubrication.
2. Damage or repairs required as a consequence of faulty installation, misapplication, abuse, improper servicing, unauthorized alteration or improper operation.
3. Failure to start due to voltage conditions, blown fuses, open circuit breakers or other damages due to the inadequacy or interruption of electrical service.
4. Damage as a result of floods, winds, fires, lightning, accidents, corrosive environments or other conditions beyond the control of the Manufacturer.
5. Parts not supplied or designated by the Manufacturer, or damages resulting from their use.
6. Electricity or fuel costs or increases in electricity or fuel costs from any reason whatsoever including additional or unusual use of supplemental electric heat.
7. ANY SPECIAL INDIRECT OR CONSEQUENTIAL PROPERTY OR COMMERCIAL
DAMAGE OF ANY NATURE WHATSOEVER. Some states do not allow the exclusion of incidental or consequential damages, so the above may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights which may vary form area to area.

 
Central Air Conditioners-Packaged Rooftop air conditioner
1,What’s the central air condition-How does a central air condition system work
2,What’s the rooftop air condition-How does a rooftop air condition system work
3, Typical installation diagram of packaged rooftop air condition
4, Why air-condition-plus brand rooftop air condition is your best supplier.
...

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Central Air Conditioners-Packaged Rooftop air conditioner

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