42BJ ULTRA Local Air Conditioning Unit - Acare

1 42bj ULTRA . Local Air Conditioning unit Cooling air flow Air throw (m). Maximum air throw 5. 4. 3. Heating air flow 2 Optimum air throw Cooling air flow Minimum air throw 1. Introduction The compact 42bj ULTRA unit is available in three sizes with Air flow a choice of two motor drives and is capable of air Conditioning 50 100 150 200 250 300 350 400 m3/h l/s rooms ranging from 25 m2 to 50 m2 in area. Its main components are a three-speed fan motor, a high-effi- Performance is based on a false ceiling height of m. ciency air filter, a fresh air supply fitted with constant fresh air Reference temperatures: summer, ambient 24 C, discharge 12 C.

2 Winter, ambient 20 C, discharge 30 C. flow controller, a chilled water cooling coil and either a hot water heating coil or shielded electric heater. Flexible, thermally and acoustically insulated discharge and return ducts are installed on site, connecting the module to one Air distribution or more plenums in the false ceiling. These feed unobtrusive linear ceiling diffusers (typically Carrier Moduboot The 42bj is installed close to sources of hot water, chilled 35BD/35SR units) supplying the room or zone where air condi- water and outdoor ventilation air. It blows warm or cold air tioning is required. through small-diameter flexible ducts to Carrier slotted linear diffusers.

3 These diffusers make use of an air flow principle The complete system comprises one or more Carrier air or known as the Coanda effect. water-cooled chillers connected to one or more air handlers sup- plying fresh air to the 42bj ULTRA units. These may be instal- led in underfloor voids or above false ceilings, preferably in corridors, where they are connected to hot and chilled water cir- cuits as well as the fresh air supply. This simplifies maintenance, since these circuits are normally installed in corridors and halls, and therefore never pass through air conditioned spaces. Only the passive elements of the system, that is the 35BD diffusers, are within occupied spaces.

4 Nowadays the noise level, or rather the lack of noise, is a deci- ding factor in the selection of an air Conditioning system. Low noise was a key objective in the design of the 42bj ULTRA . In addition its available static pressure allows the unit to be instal- led well away from the air conditioned space. Heating air flow Low noise, remoteness from the space which it serves allied with easy maintenance are key attributes influencing the selec- tion of an air Conditioning system. Cooling air flow Supply/return Moduboot Hot/chilled water inlet/outlet SOUND LEVEL METER. MODUBOOT PART NUMBER 35SR1800SH234A. Flexible, thermally and acoustically insulated Str lick SMO Sound pressure level was measured with the aid of a Bruel &.

5 PHON AL2 discharge and return ducts, or similar, connect the Kjaer (class 1) sound level meter placed in the centre of the 42bj ULTRA to two Moduboots in the false ceiling. These room at a height of m. The room was unfurnished, the cei- units feed unobtrusive linear ceiling diffusers supplying the ling type was fibre and the floor was carpeted. room or zone where air Conditioning is required. NC curve NC curve dB dB. 60 60. 125 l/s (450 m3/h) 189 l/s (680 m3/h). 50 50. 86 l/s (310 m3/h) 125 l/s (450 m3/h). 61 l/s (220 m3/h) 71 l/s (255 m3/h). Background noise Background noise 40 40. 30 30. 20 APPROX. AUDIBILITY 20 APPROX. AUDIBILITY.

6 THRESHOLD THRESHOLD. 10 10. 63 125 250 500 1000 2000 Hz 63 125 250 500 1000 2000 Hz ULTRA size 1 ULTRA size 3. Qv, l/s (m3/h) 63 125 250 500 1000 2000 A NC Qv, l/s (m3/h) 63 125 250 500 1000 2000 A NC. 125 (450) 35 189 (680) 36. 86 (310) 28 125 (450) 28. 61 (220) 21 71 (250) 18. Background noise ** Background noise **. Physical and electrical characteristics 42bj ULTRA Size 1 Size 2 Size 3. Nominal air flow l/s (m3/h) 125 (450) 194 (700) 194 (700). Corresponding available static pressure Pa 82 80 70. Total nominal cooling capacity kW Nominale heating capacity kW Electric heater capacity kW Operating weight kg 31 40 38. Notes: Based upon water entering at 6 C, room air at 25 C dry bulb, 50% relative humidity, 5 C.

7 T and nominal air flow. No 14285-79, October 2000 - Supersedes No: 14285-79, December 1998 Manufacturer reserves the right to change any product whithout notice. Manufacturer: Carrier , Montluel, France.