The unit cools air by passing the condensed refrigerant through a heat exchanger inside the building to be cooled.
Direct expansion fan coil unit.
These units have been engineered for domestic and commercial application.
The popularity of this system is because the installation work has been made easier hence reducing the cost of the overall system.
Direct expansion dx coils are designed for use with puron r 410a refrigerant and have copper tubes mechanically bonded to aluminum sine wave fins.
Easier installation and service.
The units are pre wired pre charged with puron r 410a refrigerant and 42tpm direct expansion fan coil units are available in 7 sizes with nominal cooling capacity range from 1 5 to 5 0 tons.
The carrier 40lau horizontal type direct expansion fan coil units come in 6 sizes covering air flowrate range between 1 600 to 5 000 cfm.
No other selection of fan coils is more complete than carrier s airstream product line.
Since the air is cooled directly by the refrigerant the cooling efficiency of the dx plants is higher.
However it is not always feasible to carry the refrigerant piping to the large distances hence direct expansion or the dx type of central air conditioning system is usually used for cooling the small.
40lau fan coil units produce nominal capacities ranging from 48 000 to 150 000 btu hr.
Each unit is designed to occupy a minimum space.
It is the type of air conditioning unit most commonly used in homes in the united states.
Direct expansion coils include matched factory installed thermostatic expansion valves txvs with matching distributor nozzles.
The dx system works in such a way that the evaporator is located in the space to be refrigerated.
In the direct expansion or dx types of air central conditioning plants the air used for cooling space is directly chilled by the refrigerant in the cooling coil of the air handling unit.
On off control of the cold liquid to each room is effected by a solenoid valve within each indoor unit controlled by a room thermostat.
A division of mestek inc since 2000 airtherm offers a full line of fan coils as well as hydronic heating products all proudly made in the usa.
A direct expansion air conditioning unit also called a dx unit cools indoor air using a condensed refrigerant liquid.
The direct expansion system in hvac has been growing rapidly due to its ability to get rid of most duct work and piping.
With everything from belt drive to ducted units and unique stackable configurations all in multiple models and capacities airstream units offer exceptional flexibility and availability.
Liquid from the condenser passes directly through an expansion device and the resulting mixture of cold liquid and flash gas is distributed to each of the fan coil units on the circuit.
