Units are constructed with heliarc welded tubular steel frames. The tubular construction provides for maximum strength and ease of access. Side and front panels can be easily removed with quarter-turn fasteners allowing full access to all unit components. All panels include 1 inch thick, 11/2 pound density insulation for protection and sound attenuation.
Designed for draw through application, the computer selected dual circuited A-frame coil has an interwoven surface that increases unit efficiency at low load conditions. Air is drawn through both circuits of the coil at low velocity providing effective surface exposure with minimum turbulence. Air bypass is provided to prevent saturated air from being introduced into the controlled space. The coil sits in a stainless steel drain pan.
The centrifugal, forward curved, double width, double inlet blower configuration is engineered for quiet reliable operation. The dual belt driven variable pitch drive section provides adjustable air flow capability to match the load requirements of the controlled space. The draw through design insures even air distribution across the coil, low internal cabinet pressure losses and static sealing of the filter section. Motors are mounted on an adjustable slide base and have internal overload protection.
Units are provided with 4 inch deep, 30% efficient (based on ASHRAE Std. 52-76) MERV 8, pleated filters. The filter section is accessible from the top or side on downflow units and the right hand side on upflow units.
Three stage electric reheat is standard. Low-watt density, finned, tubular sheathed coils are constructed of stainless steel and provide ample capacity to maintain room drybulb conditions during dehumidification. Low-watt density coils eliminate ionization associated with open air electric resistance heating.
Data Aire Series units include an electric steam generator humidifier with “quick change” disposable cylinders and auto-flush cycle. The steam generator humidifier with its patented control system optimizes cylinder life and energy efficiency by concentrating incoming water to a predetermined conductivity much higher than that of any entering water. The control system continuously monitors the conductivity in the cylinder through its electronics which allows water to be flushed as often as is necessary to maintain the capacity at this design conductivity. The high design conductivity results in a minimum flushing of heated water which saves energy. The humidifier is designed to allow all units at any voltage to produce full rated steam output capacity at an optimum low water level based on this design conductivity.
Dual refrigeration circuits include high efficiency hermetic scroll type compressors. Scroll compressors represent new yet proven compressor technology. Scroll compressors offer a combination of reliability, performance and efficiency. System noise is inherently quieter with scroll compressors.
Scroll compressors offer:
Simplicity – Fewer parts. Two components, a fixed scroll and orbiting scroll, replace approximately 15 parts required to do the same work.
Improved Starting Ability – With the scroll design the internal compression components always start unloaded even if the system pressures are not balanced. Since internal compressor pressures are always balanced at start-up, low voltage characteristics are excellent for scroll compressors.
Energy Efficiency – Scroll compressors are at least 10% more efficient than reciprocating type compressors.The suction and discharge processes of a scroll compressor are physically separated . This reduces heat transfer between the suction and discharge gas. In a piston type compressor the cylinder is exposed to both suction and discharge gas. This results in high heat transfer reducing the compressor efficiency.
Scroll compressor compression and discharge processes are very smooth. Gas is compressed in approximately 11/2 revolutions compared to less than 1/2 revolution for a piston.
Scrolls require no valves. Piston compressors require both suction and discharge valves. No valves, no valve losses.
Durability – Significant design effort and system cost are required to protect piston compressors from slugging and debris. Scroll compressors are designed to be more tolerant of both liquid and debris.
Reliability – Scrolls contain fewer moving parts resulting in greater reliability. Proven performance means fewer maintenance calls for field personnel.
Lower Sound – Systems properly designed with scroll compressors will be inherently quieter. On average, the compressor is up to 5 decibels quieter. (Sound characteristics of a scroll compressor are different than that of a reciprocating compressor. These do not effect system performance or reliability)
These durable, heavy duty compressors have no gaskets or seals, eliminating the possibility of refrigerant or oil leaking into the controlled space or environment. Each refrigeration circuit includes built-in compressor overload protection, crankcase heater, filter drier, sight glass, adjustable expansion valve with external equalizer, low pressure override timer (air cooled units), manual reset high pressure control, and anti-short cycle timer.
Water/glycol cooled units include counterflow condensers sized to provide the required capacity for heat rejection with minimum water/glycol flow and total pressure drop. Head pressure regulating valves control the condensing temperature and maintain required capacity at various water/glycol flow rates and temperatures.
Air Cooled with Remote Outdoor Air Cooled Condenser
A wide range of outdoor condensers are available with vertical air discharge. Condensers manufactured by Data Aire are sized to meet the required heat rejection and ambient conditions. The industrial duty condenser design includes a powder coated finished housing, aluminum finned copper tube coils, powder coated fan guards, energy efficient, thermally protected direct drive motors, and variable speed fan control on the lead motor for proper control down to -20° F. Additional fan motors are controlled with ambient thermostats.
Air Cooled with Indoor Condenser
A wide range of floor mounted indoor condensers with horizontal intake and discharge are available for applications where an outdoor condenser cannot be used. Finished to match the indoor evaporator section, the condenser includes a centrifugal, forward curved, double width, double inlet blower engineered for quiet and reliable operation. The belt driven variable pitch drive section provides adjustable airflow. The motor has internal overload protection and is mounted on an adjustable slide base. Indoor condensers are provided with a factory mounted and piped receiver. The receiver has a head pressure control valve to maintain flooded condenser control.
Air Cooled with Remote Outdoor Condensing Unit
When compressors are required to be out of the controlled space, Data Aire Series units are available with a remote outdoor condensing unit. The condensing unit includes the compressors with built-in overload protection, crankcase heater, filter drier, sight glass, and condenser coil. The condenser coil is constructed with copper tubes and aluminum fins. The housing has a powder coated finish with vertical air discharge. The condenser is variable speed fan control on the lead motor for head pressure control down to -20°F. Additional fan motors are controlled by ambient fan thermostats.
Water/Glycol Cooled with Remote Outdoor Fluid Cooler
Remote outdoor dry coolers (fluid coolers) are available in a variety of sizes. Each dry cooler includes a powder coated finished housing, aluminum finned copper tube coil, powder coated fan guards, surge tank, pump contactor, and energy efficient, thermally protected direct drive motors. Dry coolers with multiple motors have cycling control.
Water/Glycol Cooled with Indoor Fluid Cooler
When required a wide range of floor mounted indoor fluid coolers (dry coolers) are available. The air intake and discharge are horizontal. Units are finished to match the indoor unit. The centrifugal, forward curved, double width, double inlet blower is engineered for quiet reliable operation. The belt driven variable pitch drive section provides adjustable airflow. The fan motor has internal overload protection and is mounted on anadjustable slide base. The unit control panel includes a pump contactor (units can be ordered with a factory mounted pump).
The microprocessor based Data Alarm Processor-III™ offers the definite answer for precision environmental control. The DAP-III™ control system not only controls and monitors temperature, humidity, airflow, and cleanliness, it provides component run times, alarm history, and an automatic self-test of the microprocessor on system start-up. All messages are presented in a clear vernacular format and sequentially displayed on a 2 row, 80 character, backlit liquid crystal display (LCD).
OPERATION – High reliability, flat, sealed switches with tactile feedback allow unit on/off operation, menu selection for programming, operational information, diagnostics, and historical data. Multilevel password prevents unauthorized access. Alarm conditions are enunciated by an audible alarm. The alarm silence switch will quiet the audible alarm but the display
will continue to indicate the alarm condition until the problem is corrected.
• Forward/Backward Menu Access
• Multilevel Password Access
• Stand Alone Panel
• All Settings from Face of Panel
• Factory Calibrated Temperature Sensor
• Factory Calibrated Humidity Sensor
• Database of Unit and Room Conditions
• All Programmed Settings Saved in EEPROM
• Battery Backup for Historical Data
• Automatic Self-Test Diagnostics
• Select Alarms Optionally Disabled
DIAGNOSTIC & SERVICE FEATURES
• Manual Diagnostics Program
• Alarms Displayed in Order of Occurrence
• Manual Override for: Blower
Cool 1 and 2
• Adjustable Alarm Limit
• Four Programmable Optional Alarms
• Programmable Delays for Optional Alarms
• Programmable Remote Alarm
• Audio Alarm Tone
• Selectable Control Type
• Sequential Load Activation
• Temperature Anticipation
• Humidity Anticipation
• Energy Saver (Glycol) Operation
• Auxiliary Chilled Water Operation
• Supplemental Compressor Operation with Energy Saver
• Dehumidification Mode Lockout
• Automatic Compressor Rotation
• Automatic Reheat Element Rotation
• Chilled Water, Energy Saver,Hot Water Coil Flush
• Compressor Short Cycle Control
• Start Time Delay
• Automatic or Manual Restart
PROTECTIVE & SAFETY FEATURES
• Metal Shell Enclosure with Sealed Front Control Panel
• Isolation Transformer
• Opto-Coupler Signal Inputs
• Network Bypass Relays
• Protected 24 VAC Power Input
• Heavy Ground Planes & Power Foils
• Watch Dog Timer
• Fused RS-485 Network Lines
• Switching Power Supply
• Analog Inputs
• RS-485 Network System
• Modulating Humidifier Control
• Two Additional Remote Alarms
• Humidifier Flush Cycle
• Temperature Setpoint: 65-85° F/18• 3-29• 4° C
• Temperature Deadband: ± 1-5º F/C
• High Temperature Alarm Limit: 70-90° F/21• 1-32• 2° C
• Low Temperature Alarm Limit: 55-75° F/12• 8-23• 9° C
• Humidity Setpoint: 30-70% RH
• Humidity Deadband: : 1-15% RH
• High Humidity Alarm Limit: 35-90% RH
• Low Humidity Alarm Limit: 10-65% RH
• Mode and Stage Response Time: 1-5 minutes
• Compressor Lead/Lag Sequence: Automatic/ #1 Lead/ # 2 Lead
• Reset Equipment Times
Compressor 1, 2
Reheat Strip 1, 2, 3
Chilled Water Cooling*
Reset All to Zero Runtimes
• Automatic Self-Test: On/Off
• Dehumidification Mode
1 Compressor within Reheat
2 Compressors within Reheat Limits
1 Compressor with No Reheat
2 Compressors with No Reheat
• System Start Delay: 0-10 Minutes in 5 Second
• Message for Optional Alarm 1,2,3,4
Custom Message Alarm: 25 Space
Fan Motor Overload: Check Motor Amperage*
Local Alarm: See Tag Inside Door*
Standby Pump On: Check Primary Pump*
UPS/Alternate Power On: Check Main Power*
Reheat and Humidification Inhibited
• Audio Alarm Mode: None/Long/Full/Short Beep
• Manual Diagnostics: Normal Menu or Diagnostic Mode
• Humidity Anticipation: On/Off
• Compressor Short Cycle Alarm: On/Off
• Compressor Supplements to Energy Saver*
Energy Saver Not Available
Energy Saver With No Compressors
Energy Saver With 1 Compressor
Energy Saver With 2 Compressors
• Low Discharge Temperature Alarm Limit*: 45-60° F/7• 2-15• 6° C
• Power Failure or Restart Mode
Automatic: No Message or Alarm
Automatic: Message, Audio Alarm, Relay
Manual: Message, Audio Alarm, Relay
• Person to Contact on Alarm
Message Not Used
Data Processing Manager
• Define Password: 00-99
• Firestat Temperature Alarm Limit: Unit Shutdown & Alarm @ 100-150° F
• Temperature Scale: Fahrenheit/Centigrade
• Unit and Network Identification: 0-260
• Remote Alarm 1,2,3 Selection*
Compressor Short Cycle
Custom Message 1,2,3, and 4*
Discharge Air Sensor Problem*
Fan Motor Overload*
High Pressure Compressor 1
High Pressure Compressor 2
Humidity Sensor Problem
Local Alarm 1,2,3, and 4*
Low Pressure Compressor 1
Low Pressure Compressor 2
No Water Flow*
Power Problem or Restart
Standby Pump On*
Temperature Sensor Problem
Water Detection Probe
UPS/Alternate Power On
Reheat and Humidification Inhibited
• Delay for Optional Alarm 1,2,3,4: 0-900 Seconds/Off
• Humidifier Autoflush Timer*
Autoflush Timer Not Used
12-96 Hours in 12 Hour Increments
• Scheduled Normal Maintenance: 1-1000 Hours/Off
• Control Logic: Setpoint Deviation/PID/Smart Logic
• Calibrate Temperature Sensor: + 9• 9° F/C
• Calibrate Humidity Sensor: + 30% RH
• Calibrate Discharge Sensor*: 9• 9° F/C
• Reheat Stages
1, 2, or 3
• Water Valve Mode: None
• Chilled Water Cooling
Energy Saver Cooling
Auxiliary Chilled Water Cooling
• Water Valve Range
• Reverse Acting Water Valve: Yes/No
DISPLAYED CONDITIONS, DATA, and FUNCTIONS – The Data Alarm Processor-III™ displays and monitors the following conditions, data, and functions:
• Temperature Setpoint
• Current Temperature
• Current Percent of Capacity Utilized
• Unit or Network ID Number
• Cooling 1,2,3,4 as applicable
• Energy Saver Cooling
• Humidity Setpoint
• Current Humidity
• Current Discharge Air Temperature*
• Zone Number
• Reheat Stages 1, 2, 3
ALARMS – Alarm conditions are displayed and monitored on the microprocessor LCD along with an audible alarm. The alarm silence switch will quiet the audible alarm but the display will continue to indicate the alarm condition until it is corrected. The following alarms are displayed:
• High Temperature Warning
• Low Temperature Warning
• High Humidity Warning
• Low Humidity Warning
• High Pressure Compressor 1
• High Pressure Compressor 2
• Low Pressure Compressor 1
• Low Pressure Compressor 2
• Under Floor Water Detection
• No Air Flow
• Dirty Filter
• Humidifier Failure
• Manual Override
• Firestat Tripped
• Low Voltage Warning
• Power Failure Restart
• Compressor Short Cycle
• Maintenance Required
• Temperature Sensor Error
• Humidity Sensor Error
• Discharge Air Sensor Error*
• Local Alarm
• Fan Motor Overload*
• No Water Flow*
• Smoke Detected*
• Standby Pump On*
• Custom Message*
HISTORICAL DATA – In order to facilitate maintenance and service, historical data can be recalled and displayed. The historical database is maintained by battery back-up should power fail. The following data can be recalled and displayed:
• High Temperature Last 24 Hours
• Low Temperature Last 24 Hours
• High Humidity Last 24 Hours
• Low Humidity Last 24 Hours
• Average % of Capacity Last Hour
• Alarm History for Last 10 Alarms
• Equipment Runtimes
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 operates in the following range: return air setpoint plus deadband plus 2 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 temperature falls below the deadband minus setpoint, the valve will close and the space is considered satisfied. While still in Energy Saver with the valve modulating, if the temperature goes beyond setpoint plus 2 degrees, the Energy Saver valve will close and DX cooling will begin.
The Energy Saver coil includes the next size motor, 3-way pressure control valve on the condenser water circuit, and 3-way valve on the economy coil. Common piping for coil and condensers is provided.
Energy Saver/Compressor Supplement – Units with Energy Saver option can be provided with compressor supplement if the Energy Saver is not sufficient as a stand alone system. When the incoming water/glycol temperature is below the setpoint of the water changeover thermostat, the Energy Saver 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 deadband. The compressor will come on at setpoint plus deadband plus 1° (the valve is 100% open at this point). The compressor will go off at setpoint plus deadband plus 0.7°. The valve will close proportionally – 10% for each 0.1° below setpoint plusdeadband. An air discharge sensor is factory installed.
Auxiliary Chilled Water Coil – Where an existing chilled water loop is available, units can be fitted with an auxiliary chilled water coil. Units will operate using the chilled water for cooling. Upon a loss of water flow or an increase in room temperature the system will bring on compressor (DX) cooling. The Auxiliary Chilled Water coil includes the next size motor. 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 sufficient on a stand alone basis. An air discharge sensor is factory installed. (See Energy Saver/Compressor Supplement for details)
Remote Temperature and Humidity Sensors – Temperature and humidity sensors may be ordered for remote wall mounting. Sensors are provided in a wall mount plastic case for remote sensing of temperature and humidity. 25 feet of shielded cable is provided for field wiring.
Smoke Detector – A unit mounted smoke detector will shut down the unit if smoke is sensed. The unit mounted microprocessor control 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.
Unit Mounted Disconnect – A unit mounted non-automatic disconnect switch is installed in the high voltage electrical section. The operating mechanism (handle) protrudes through the decorative exterior panel. The operating mechanism prevents access to the high voltage electrical components by not allowing entry until switched to the “OFF” position.
Tandem Scroll Compressors – Units may be ordered with tandem scroll compressors when four stage compressor control is required. Units remain dual circuited. Tandem scrolls offer the inherent advantages of scroll technology: higher efficiency, increased reliability, lower sound, and excellent liquid handling.
Scroll tandems offer two steps of modulation so that one or both compressors (per circuit) can run depending upon the load of the system, resulting in part-load efficiency equal to full load efficiency. Two-step modulation is possible because of a carefully designed tubing configuration and the scroll’s superior ability to tolerate liquid. The built-in discharge check valve, present in all scroll compressors, effectively prevents liquid migration in the off compressor. Oil migration is controlled with two specially designed oil and gas equalization lines. (See Supplement TS1-99: Tandem Scroll Technical Performance)
Semi-Hermetic Compressors – Cast iron semi-hermetic compressors are available on all Data Aire Series units. Semi-hermetic compressors are mounted on vibration isolators and have built-in overload protection. The compressors also include oil sight glass, reversible oil pump for forced feed lubrication, and suction line strainer. Units with semi-hermetic compressor option also include solenoid valves and mufflers. Maximum rpm is 1750.
4 Step Control (Cylinder Unloading) – Units with semi-hermetic compressors may be ordered with four step control for periods of low load conditions. Cylinder unloaders on one head of each compressor reduces compressor cooling capacity. Four steps of cooling are available to meet changing room conditions.
Step 1 Lead compressor starts with unloader valve activated
Step 2 Lead compressor running at full load
Step 3 Lag compressor starts with unloader valve activated
Step 4 Lag compressor running at full load
Hot Gas Bypass – Hot gas bypass is available for changing load conditions. The hot gas bypass valve is installed between the compressor discharge line and the leaving side of the expansion valve through a side outlet distributor. The system with the evaporator under full load will maintain pressure on the leaving side of the hot gas bypass valve to keep the valve port closed. Should the load on the evaporator decrease to the point where the coil is below the desired setting, the pressure on the discharge of the hot gas bypass will put pressure on the diaphragm overcoming the spring pressure of the seat and allowing some hot gas to mix with the normal liquid discharge of the expansion valve raising the evaporator pressure. This reduces the cooling capacity of the unit to match the load. The hot gas bypass valve can be adjusted to “fine tune” the unit to room conditions.
Humidifier Modulating Control – Modulating control may be added to the unit’s steam generator humidifier. Modulating control will allow the humidifier to match its output to the signal from the humidity control. A self-regulating auto flush is included.
Hot Water Reheat – Where hot water is available, a water coil for reheat is offered. The coil is designed for 150 psi maximum water pressure and includes a 2-way valve (a 3-way is also available). Units with the hot water reheat do not include electric reheat. Supplemental reheat may be ordered.
Hot Gas Reheat - The unit’s hot gas discharge may be used for reheat and maximum system efficiency. Supplemental electric reheat may be ordered in addition to the hot gas reheat.
3-Way Water Regulating Valve – 3-way water regulating valves are available on water and glycol cooled units to replace the standard 2-way valve. The 3-way valve controls the water/glycol flow rate to maintain the required capacity under varying conditions.
Upflow Air Discharge Plenum – Upflow air discharge plenums are fully insulated with front discharge grille. Side grilles for both or one side are available. Plenums are 18″ high and painted to match the unit’s color.
Floorstands – Floorstands are adjustable (± 2 inches) and may be ordered with factory installed turning vane or with seismic construction.
High Efficiency Filters – Standard filters are rated at 30% (per ASHRAE Std. 52-76) MERV 8. Higher efficiency filters are available (consult factory regarding efficiency percentage and unit static pressures).
Condensate Pumps – Condensate pumps may be ordered factory installed or shipped loose for field installation. Condensate pumps are complete with sump, motor, and automatic control. Pumps shipped loose are available in 115, 230, or 460 volts.
with check valve – 40 GPH at 20 feet
without check valve – 130 GPH at 40 feet
with check valve – 50 GPH at 20 feet
with check valve – 270 GPH at 40 feet
Pump Package – Centrifugal pump packages are available to circulate water or water/glycol solutions. Pumps are available in various horsepower and voltages. Both 3400 and 1750 rpm pumps are available as an option.
Pump Enclosure – Pump enclosures are available for either single or dual pump applications. Pump enclosures are vented and weather resistant. When ordered with pumps, the pumps are factory mounted in the enclosure ready for field piping and wiring.
Integral Pump Enclosures – Pumps may be factory mounted as an integral part of the dry cooler. A 30″ extension is added to the dry cooler. Pumps are pre-piped and wired and includes shut-off valves. A flow switch is included with dual pumps.
Pump Auto-Changeover – Dual pump packages may be provided with a pump auto-changeover control and NEMA 4 flow switch (field installed). The pump auto-changeover control is factory wired and mounted in the dry cooler control box. The pump auto-changeover control provides automatic pump changeover in the event of a pump failure. Upon pump changeover, an audible alarm will sound at the indoor unit and a message (“STANDBY PUMP ON”) will be displayed on the indoor unit microprocessor display.
Extended Compressor Warranties - Extended compressor warranties are available for periods of twenty-four (24) or forty-two (42) months in addition to the standard factory eighteen (18) month warranty. These warranties are for the replacement of compressors and do not include labor.
*Some of the programmable selections, displays, or alarms may require additional components or sensors. Contact your Data Aire representative for a detailed analysis of your requirements.