Data Aire DAFC-07 Especificaciones descargar pdf (Pagina 10)

Energy Saver Coil - The Data Aire Energy Saver Coil is built

into the system to provide total required capacity. Whenever

the incoming water/glycol temperature is below 45° F/7.2° C,

Energy Saver cooling is available. Energy Saver mode oper-

ates in the following range: Return air setpoint plus deadband

plus two degrees. The Energy Saver will operate providing

there is a need for cooling. The valve will open at setpoint

plus deadband. The valve will modulate as long as the space

is between setpoint plus deadband plus 2 degrees. If the tem-

perature falls below the deadband minus setpoint, the valve

will close and the space is considered satisﬁ ed. While still in

Energy Saver with the valve modulating, if the temperature

goes beyond setpoint plus deadband plus 2 degrees the Energy

Saver valve will close and DX cooling will begin.

The Energy Saver Coil includes a 3-way pressure control

valve on condenser water circuit, and a 3-way valve on the

Energy Saver coil. Common piping for coil and condenser is

provided.

Energy Saver/Compressor Supplement - Units with the En-

ergy Saver Coil can be provided with compressor supplement

if the Energy Saver is not sufﬁ cient as a stand alone system.

When the incoming water/glycol temperature is below the

setpoint of the water changeover thermostat, the Energy Saver

mode is enabled (even if there is no call for cooling). Upon a

call for cooling (setpoint plus deadband), the valve will open

proportionally - 10% for each 0.1° above setpoint plus dead-

band. The compressor will come on at setpoint plus deadband

plus 1.0° (the valve is 100% open at this point). The compres-

sor will go off at setpoint plus deadband plus 0.7°. The valve

will close proportionally - 10% for each 0.1° below setpoint

plus deadband. An air discharge sensor is factory installed.

Auxiliary Chilled Water Coil - Where an existing chilled

water loop is available, units can be ﬁ tted with an auxiliary

chilled water coil. Units will operate using the chilled water

for cooling. Upon a loss of water ﬂ ow or an increase in room

temperature the system will bring on compressor (DX) cool-

ing. Separate piping is provided for the chilled water coil and

refrigeration connections.

Auxiliary Chilled Water Coil/Compressor Supplement - The

Auxiliary Chilled Water Coil can be provided with compressor

supplement for extended savings by allowing the compressor

to supplement operation as needed when the chilled water is

not sufﬁ cient on a stand alone basis. An discharge air sensor is

factory installed. (See Energy Saver/Compressor Supplement

for details).

OPTIONS

Remote Temperature and Humidity Sensors - Temperature and

humidity sensors may be ordered for remote wall mounting in

lieu of the standard return air sensors. Sensors are provided in

a wall mounted plastic case for remote sensing of temperature

and humidity. 25 feet of shielded cable is provided for ﬁ eld

wiring.

Smoke Detector - A unit mounted smoke detector will shut

down the unit if smoke is sensed. The microprocessor will

sound an alarm and display a “SMOKE DETECTED” message.

The smoke detector is mounted in the return air stream and is

provided with auxiliary contacts.

Next Size Larger Motor - Should your installation require addi-

tional airﬂ ow or increased static pressure you can order a larger

motor to meet these requirements.

Hot Water Reheat - Where hot water is available, a unit in-

stalled reheat coil can use hot water reheat. The coil is designed

for 150 psi maximum water pressure and includes a 2-way valve

(a 3-way valve is optional).

Hot Gas Reheat - Unit hot gas discharge is used for reheat and

maximum system efﬁ ciency.

(Note: Units with Hot Gas Bypass option are not available with

hot gas reheat).

Steam Reheat - When your building already has steam lines this

option may be a more beneﬁ cial way of providing reheat to your

unit. When selected the unit comes with a steam coil and 2-way

valve, replacing the standard electric reheat.

Compressor Rotalock Valves - These valves facilitate servicing

and permit the changing of compressor without the complete

loss of refrigerant.

Unit Mounted Disconnect - A unit mounted nonautomatic dis-

connect switch is installed in the high voltage electrical section.

The operating mechanism allows access to the high voltage

electrical components when switched to the “OFF” position.

The operating mechanism (handle) protrudes through the deco-

rative door.

Hot Gas Bypass - Hot gas bypass may be ordered for changing

load conditions. The hot gas bypass is installed between the

compressor discharge line and the leaving side of the expan-

sion valve through a side outlet distributor. The system with

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