Data Aire DARC 11 User Manual

16 • Air Cooled Condenser User Manual
4.0 CHARGING
4.1 Fan Speed Control/Fan Cycling
Data Aire air-cooled condensers (DARC) is equipped with the latest upgrade to control the high side pressure
of the refrigeration system. The Fan Speed Control (FSC) is a single-phase condenser fan speed controller that
is compact, weather-resistant, and durable speed control for single-phase, permanent-split capacitor (PSC)
motors used in a wide variety of low-ambient refrigeration and air conditioning condenser applications. The
FSC is designed to allow additional features and application flexibility.
On single fan condensers this is the only means of fan speed control. Multiple fan condensers are
provided with fan speed control on the rst motor (nearest the header) and ON/OFF operation for
all other motors. The FSC is pre-programmed at the factory and there is no need to adjust the unit
in the eld. The rst fan will cycle with the head pressure of the unit.
Refrigerant Starting Pressure Full Speed Pressure
R-410a 320 PSIG 400 PSIG
R-407c 220 PSIG 285 PSIG
When the condenser load exceeds the output capacity of the rst fan (controlled by the FSC), the
second fan will turn ON to full speed and the rst fan will modulate, as required to maintain the
head pressure of the unit. This allows the condenser load to be modulated by the cooling e󰀨ect of
two fans instead of just one.
4.2 Ambient Sensing Thermostats
On condensers with more than two fans, the additional motors (subsequent to the rst and second
motors) are cycled by means of ambient temperature sensing thermostats. These thermostats have
a capillary tube with remote sensing bulb. They function best with the sensing bulb is mounted
below the coil, away from exposure to direct sun light and the bulb in the vertical position. An in-
struction set comes as part of a mounting kit that includes a sheet metal bracket, mounting clamps
and TEK screws. This includes directions for eld mounting and adjustment. The ambient sensing
thermostats are adjusted to maintain a desired head pressure range shown below:
Refrigerant Head Pressure
R-410a 340 to 400 PSIG
R-407c 230 to 285 PSIG
4.2.1 Typical Ambient Thermostats Factory Settings
AMBIENT THERMOSTATS FACTORY SETTINGS
Number of
Fans
Motor Number
1
Motor Number 2 Motor Number
3
Motor Number
4
Motor Number
5
1 FSC N/A N/A N/A N/A
2 FSC Pressure Control N/A N/A N/A
3 FSC Pressure Control 50°F N/A N/A
4 FSC Pressure Control 75°F 50°F N/A
5 FSC Pressure Control 85°F 75°F 50°F
As the ambient air temperature decreases the capacity of the condenser increases. The capacity
increase is directly proportional to the temperature di󰀨erence (TD) between the condensing tem-

Data Aire DARC 11 Specifications

General

Brand	Data Aire
Model	DARC 11
Category	Air Conditioner
Language	English