4
HOT/CHILLED WATER
INLET/OUTLET
DISCHARGE/RETURN
MODUBOOT
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.
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 high available static pressure allows the unit to
be installed well away from the air conditioned space.
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.
1 - INTRODUCTION
The compact 42BJ ULTRA is available in three sizes with a
choice of three motor drives and is capable of air conditioning
rooms ranging from 25 m
2
to 50 m
2
in area.
Its main components are a motorised, variable-speed centrifu-
gal fan, a high-efficiency air filter, a fresh air supply fitted
with an air flow control unit, a chilled water cooling coil and
either a hot water heating coil or an electric heating unit.
Flexible, thermally insulated (isophonic) discharge and return
ducts are installed on site, connecting the module to one or
more plenums in the false ceiling. These feed unobtrusive
linear ceiling diffusers (typically Carrier Moduboot
35BD/35SR units) supplying the room or zone where air
conditioning is required.
The complete system comprises one or more Carrier air or
water-cooled chillers connected to one or more air handlers
supplying fresh air to the 42BJ ULTRA. These may be instal-
led in underfloor voids or above false ceilings, preferably in
corridors, where they are connected to hot and chilled water
circuits as well as the fresh air supply.