It is one of the most important features of this rooftop as it maximise seasonal efficiency by reducing the use of thermodynamic cooling in mid season. 
Thermodynamic cooling can be replaced by Free Cooling when outdoor temperature is below the building set point saving up to 15% on annual energy consumption.
Rooftop units are supplied with economizer and fresh air hood to improve comfort through better fresh air management and allow energy savings with free cooling.
Structure
Panels and frame are made from galvanized steel protected with polyester powder painting to ensure total resistance to atmospheric agents.
Direct expansion coils with condensate drain tray.
Hermetic compressor
High efficiency scroll compressor for the whole range, with built-in thermal overload cut-out and crankcase heater, mounted on rubber vibration dampers.
Ripple type acoustic insulation for compressor section, and thermal insulation for coil and fan section, low noise.
Centrifugal fan
Forward curve centrifugal fans for air treatment section and axial fans for condensation section.
Front, side and underside air discharge of the treatment unit.
High external pressure, long air supply distance.
Electric panel
Electric panel consists of breakers and contactors for compressors and fan motors, phase sequence relay and other necessary protection devices for the main components.
Easy operation line controller
Cooling/Heating/Auto
Error indication
Timing on/off
Optional
Economizer with fresh, return air dampers and fresh air hood
Free cooling function for low ambient temperature
Low ambient control device for operation of outdoor units at ambient temperatures from less than 20°C down to -10°C
BMS devices
T3 (Tropical climate)
Roof curb
Metal/aluminum filter
Heat recovery to 100%
Evaporating section: double skin with 50mm polyurethane foam
Optional water heating coil
Metal or plastic mesh on condenser coil
Optional supply/return air configurations
Upgraded plug fan
G4 filter, plate and bag filter
Exhaust air
● Gravity exhaust damper
Gravity exhaust damper Installed with economizer assembly, gravity exhaust damper relief pressure when outside air is being introduced in the system. It is a cheap and smart way to avoid over pressure in a building.
● Power exhaust fans
Installed with economizer assembly, it provides exhaust air pressure relief when high levels of fresh air are being introduced in the system.
Interlocked to run when return air dampers are being closed and supply air blower is in operation. The extraction fans run when outdoor air dampers are at least 50% open (adjustable). It is also overload protected. A gravity exhaust damper is supplied with this option to prevent air from entering the unit during shutdown. The power exhaust fans have been size to exhaust 50% of the nominal air flow of the unit.
Cooling/heating mode without fresh air Free-cooling mode
Cooling/heating mode with fresh air
①Fresh air ②Return air ③Supply air ④Exhaust air
| Model | Unit | RTU10 | RTU12 | RTU14 | RTU16 | RTU20 | RTU25 | RTU28 | RTU32 | RTU36 | RTU42 |
| Cooling* | |||||||||||
| Cooling capacity* | kW | 10.6 | 12.1 | 14.3 | 16.2 | 21.2 | 24.2 | 28.6 | 32.4 | 36.2 | 41.6 |
| Ton | 3.0 | 3.5 | 4.1 | 4.6 | 6.1 | 6.9 | 8.2 | 9.3 | 10.3 | 11.9 | |
| Nominal current* | A | 7 | 7.7 | 9.3 | 10 | 13.4 | 17.7 | 18.7 | 19.5 | 23.3 | 25.7 |
| Nominal power input* | kW | 3.55 | 4.17 | 4.92 | 5.37 | 6.75 | 8.25 | 9.95 | 10.5 | 12.7 | 13.85 |
| Heating* | |||||||||||
|
Heating capacity* |
kW | 11.3 | 12.8 | 15 | 17.3 | 22.6 | 25.6 | 30.2 | 34.6 | 38 | 44.6 |
| Ton | 3.2 | 3.7 | 4.3 | 4.9 | 6.5 | 7.3 | 8.6 | 9.9 | 10.9 | 12.7 | |
| Nominal current* | A | 6.5 | 7.2 | 8.6 | 9.2 | 12.4 | 14.3 | 17.3 | 18 | 21.3 | 23.7 |
| Nominal power input* | kW | 3.26 | 3.83 | 4.5 | 5 | 6.17 | 7.57 | 9.1 | 9.55 | 11.6 | 12.65 |
| Power supply | 380~415v/3ph/50Hz | ||||||||||
| Refrigerant charge | Kg | 3.2 | 4.2 | 5 | 5.8 | 7.3 | 8.4 | 9.8 | 10.5 | 12 | 13 |
| Compressor | |||||||||||
| Qty | Nr. | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 |
| Type | Scroll | ||||||||||
| Air treatment section | |||||||||||
| Centrifugal fans number | Nr. | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Drive type | / | Direct drive | Belt drive | ||||||||
| Air flow | m3/h | 1950 | 2400 | 2920 | 3150 | 4250 | 5400 | 5700 | 6300 | 6800 | 7900 |
| External static pressure | Pa | 150 | 150 | 180 | 180 | 150 | 235 | 305 | 290 | 270 | 250 |
| Motor power | kW | 0.5 | 0.5 | 0.7 | 0.7 | 0.7 | 1.1 | 1.5 | 1.5 | 2.2 | 2.2 |
| Condensation section | |||||||||||
| Axial fans number | Nr. | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 |
| Air flow | m3/h | 4100 | 4150 | 6100 | 7020 | 8640 | 9430 | 11230 | 12300 | 14200 | 18830 |
| Motor power | kW | 0.25 | 0.37 | 0.37 | 0.55 | 0.45 | 0.55 | 0.75 | 0.75 | 2*0.37 | 2*0.37 |
| Dimensions | |||||||||||
| Length | mm | 1350 | 1350 | 1350 | 1350 | 1820 | 1820 | 1820 | 1820 | 2540 | 2540 |
| Width | mm | 990 | 990 | 990 | 990 | 1400 | 1400 | 1400 | 1400 | 1860 | 1860 |
| Height | mm | 880 | 880 | 880 | 880 | 1100 | 1100 | 1100 | 1100 | 1180 | 1180 |
| Net weight | kg | 240 | 250 | 260 | 260 | 380 | 430 | 480 | 500 | 780 | 800 |
| Sound pressure level ** | dB(A) | 67 | 68 | 70 | 71 | 72 | 70 | 72 | 72 | 72 | 72 |
| Model | Unit | RTU48 | RTU55 | RTU64 | RTU72 | RTU88 | RTU104 | RTU120 | RTU150 | RTU170 | RTU190 |
| Cooling* | |||||||||||
|
Cooling capacity* |
kW | 47.2 | 53.2 | 63.3 | 71.4 | 87.2 | 103.3 | 118.8 | 153.4 | 168.6 | 188.5 |
| Ton | 13.5 | 15.2 | 18.1 | 20.4 | 24.9 | 29.5 | 33.9 | 43.8 | 48.1 | 53.9 | |
| Nominal current* | A | 31.3 | 32.5 | 37 | 45.5 | 53 | 68.7 | 79.7 | 88.5 | 113.8 | 135.3 |
| Nominal power input* | kW | 16.4 | 18.7 | 21.5 | 26.5 | 30.6 | 39.8 | 46 | 55 | 65.8 | 78.3 |
| Heating* | |||||||||||
|
Heating capacity* |
kW | 50.2 | 56.4 | 67 | 75.6 | 93.3 | 110.5 | 126.8 | 164.3 | 182 | 202 |
| Ton | 14.3 | 16.1 | 19.1 | 21.6 | 26.7 | 31.6 | 36.2 | 46.9 | 52 | 57.7 | |
| Nominal current* | A | 29 | 30.3 | 34.3 | 42 | 47.2 | 62.3 | 74.2 | 84.6 | 102.5 | 124.8 |
| Nominal power input* | kW | 15 | 17 | 19 | 24.1 | 27.3 | 36 | 43 | 49 | 59.3 | 72.2 |
| Power supply | 380~415V/3Ph/50Hz | ||||||||||
| Refrigerant charge | Kg | 13.5 | 15.2 | 18.1 | 20.4 | 24.9 | 29.5 | 34 | 43.8 | 48 | 54 |
| Compressor | |||||||||||
| Qty | Nr. | 2 | 2 | 2 | 2 | 2 | 4 | 4 | 4 | 4 | 4 |
| Type | Scroll | ||||||||||
| Air treatment section | |||||||||||
| Centrifugal fans number | Nr. | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Drive type | / | Belt drive | |||||||||
| Air flow | m3/h | 9350 | 10450 | 11700 | 14400 | 16600 | 19940 | 22000 | 29000 | 31400 | 34900 |
| External static pressure | Pa | 290 | 280 | 275 | 380 | 345 | 390 | 390 | 360 | 420 | 430 |
| Motor power | kW | 2.2 | 3 | 3 | 4 | 4 | 5.5 | 7.5 | 7.5 | 11 | 15 |
| Condensation section | |||||||||||
| Axial fans number | Nr. | 2 | 2 | 2 | 2 | 2 | 4 | 4 | 4 | 4 | 4 |
| Air flow | m3/h | 19200 | 21420 | 24620 | 28400 | 37500 | 43680 | 49200 | 67500 | 72000 | 84000 |
| Motor power | kW | 2*0.55 | 2*0.55 | 2*0.75 | 2*0.75 | 2*1.1 | 4*0.75 | 4*0.75 | 4*1.1 | 4*1.5 | 4*2.2 |
| Dimensions | |||||||||||
| Length | mm | 2540 | 2540 | 3090 | 3400 | 3400 | 4700 | 4700 | 5200 | 5800 | 5800 |
| Width | mm | 1860 | 1860 | 2200 | 2200 | 2200 | 2240 | 2240 | 2240 | 2240 | 2240 |
| Height | mm | 1180 | 1430 | 1430 | 1590 | 1590 | 1650 | 1650 | 1650 | 1650 | 1650 |
| Net weight | kg | 830 | 850 | 1200 | 1400 | 1500 | 1700 | 1750 | 2300 | 2500 | 2500 |
| Sound pressure level ** | dB(A) | 75 | 73 | 75 | 75 | 75 | 75 | 80 | 80 | 82 | 84 |
* 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.
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Copyright ©2012 by Jinan Amrta Air Conditioning Co.,Ltd. All rights reserved Technical support: Beijing Xinhulian Technology Co., Ltd.
