DESIGN FEATURES

 

FRAME/CABINET

 

The heliarc welded tubular steel frame provides for maximum strength and ease of access with minimum space requirement. Side and front panels can be easily opened and removed with quarter-turn fasteners, allowing full access to all unit components. All panels include 1 inch thick, 1-1/2 pound density insulation for protection and sound attenuation. All parts are easily accessible.

 

COIL SECTION

 

Designed for draw through application, the computer selected coil offers greater efficiency in the cooling and dehumidification process. Air bypass is provided to prevent saturated air from being introduced into the controlled space. The coil section is provided with a stainless steel drain pan.

 

FAN SECTION

 

The centrifugal, forward curved, double width, double inlet blower configuration is engineered for quiet reliable operation. The belt driven variable pitch drive provides adjustable air flow capability to match load requirements of the controlled space. The draw through design insures even air distribution across the coil, low internal cabinet losses, and static sealing of the filter section. Motors are mounted on an adjustable slide base and have internal overload protection.

 

FILTER SECTION

 

Units are provided with 4 inch deep, 30percent efficient filters (based on ASHRAE Std. 52-76). The filter section is accessible from the top or side on downflow units and the right hand side on upflow units.

 

REHEAT

 

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.

 

HUMIDIFICATION

 

Modular Data Temp units include an electric steam generator humidifier with a "quick change" disposable cylinder and an 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 the 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, thereby saving energy. The humidifier is designed to allow units at any voltage to produce full rated steam output capacity at an optimum water level based on the design conductivity.

 

REFRIGERATION CIRCUIT

 

The single circuit, dual stage refrigeration circuit is designed around a high efficiency hermetic scroll compressor. These durable, heavy duty, fully welded compressors have no gaskets or seals, substanially reducing the possibility of refrigerant or oil leaking into the controlled space or environment. Scroll compressors bring a combination of reliability, efficiency, and improved system sound performance to the Modular Data Temp line. 2-stage control is standard. A hot gas bypass valve allows hot gas to be redirected into the evaporator coil to reduce unit capacity . As the load increases, the solenoid valve closes at 60 psi (adjustable). Should the evaporator decrease to the point where the valve is below the desired setting, the solenoid valve will open 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 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, compressor short cycle timer, and rotalock service valves.

 

Water/glycol cooled units include a counterflow coaxial condenser sized to provide the required heat of rejection with minimum water/glycol flow for a low total pressure drop. Head pressure water regulating valves control the condenser water flow to maintain proper head pressure under varying load conditions,.

 

Air Cooled with Remote Outdoor Condenser - A wide range of outdoor condensers is available. Condensers are manufactured by Data Aire and sized to meet the heat rejection and ambient conditions as required. The industrial duty design includes galvanized corrosion resistant housing, aluminum finned copper tube coils, powder coated fan guards, energy efficient thermally protected direct drive motors, and variable fan speed control on lead fan 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, reliable operation. The belt driven variable pitch drive provides adjustable air flow. 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, complete with a head pressure control valve to maintain head pressure under varying ambient conditions down to -30° F.

 

Air Cooled with Outdoor Condensing Unit - When compressors are required to be out of the controlled space, Modular Data Temp units are available with a remote outdoor condensing unit. The condensing unit includes a hermetic scroll compressor with built-in overload protection, crankcase heater, filter drier, sight-glass, and condenser coil. The coil is constructed with copper tubes and aluminum fins. The housing is galvanized steel with vertical air discharge. The condenser fan is a variable speed type for head pressure control down to -20° F ambient temperature. Additional fan motors are controlled by ambient fan thermostats.

 

Water/Glycol Cooled with Remote Outdoor Fluid Cooler - Remote outdoor fluid coolers are available in a variety of sizes. Each dry cooler includes galvanized corrosion resistant housing, aluminum finned copper tube coil, coated fan guards, surge tank, motor contactor, pump contactor, and energy efficient thermally protected direct drive motors. Multiple fan motors are staged to maintain the desired condenser supply fluid temperature.

 

CONTROL SYSTEM

 

The microprocessor based Data Alarm Processor-II (DAP-II) offers the definitive answer for precision environmental control. The DAP-II control system not only monitors temperature, humidity, airflow, and cleanliness, it provide component runtimes, alarm history, and an automatic self-test of the microprocessor on system start-up. All messages are presented in a clear vernacular format and are sequentially displayed on a 2 row, 80 character, backlit liquid crystal display (LCD).

 

OPERATION - High reliability, flat, sealed switches with tactile feedback allow uniton/off operation, menu selection for programming, operational information, diagnostics, and historical data. Multilevel passwords prevent 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.

 

STANDARD FEATURES

 

• Forward/Backward Menu Access

• Stand Alone Panel

• All Settings from Face of Panel

• Factory Calibrated Temperature Sensor

• Multilevel Password Access

• Automatic Self-Test Diagnostics

• Database of Unit & Room Conditions

• Factory Calibrated Humidity Sensor

• Database of Unit & Room Conditions

• All Programmed Functions Saved in EEPROM

 

OPERATIONAL FEATURES

 

• Selectable Control Type

• Sequential Load Activation

• Temperature Anticipation

• Humidity Anticipation

• Dehumidification Mode Lockout

• Automatic Reheat Element Rotation

• Start Time Delay

• Compressor Short Cycle Control

• Automatic or Manual Restart

 

DIAGNOSTICS & SERVICE FEATURES

 

• Manual Diagnostic Program

• Alarms Displayed in Order of Occurrence

• Adjustable Alarm Limits

• Four Programmable Optional Alarms

• Programmable Delays for Optional Alarms

• Programmable Remote Alarm

• Select Alarms Optionally Disabled

• Audio Alarm Tone

• Manual Override for: Blower, Cool, Heat 1, Humidification, Water Valve

 

PROTECTIVE & SAFETY FEATURES

 

• Metal Shell Enclosure

• Sealed Front Control Panel

• Isolation Transformer

• Opto-Coupler Signal Inputs

• Protected 24 VAC Power Input

• Heavy Ground Planes & Power Foils

• Watch Dog Timer

• Fused RS-485 Network Lines

• Network Bypass Relays

• Switching Power Supply

 

PROGRAMMABLE FUNCTIONS - The user friendly Menu Selection Switches permit step-by-step programming of the following selections:

 

• Temperature Setpoint - 65-85° F/18.3-29.4° C

• Temperature Deadband - +/- 1-5° F/C in 0.1° increments

• 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 percent RH

• Humidity Deadband - 1-15 percent RH

• High Humidity Alarm Limit - 35-90 percent RH

• Low Humidity Alarm Limit - 10-65 percent RH

• Mode & Stage Response Time - 1 to 5 minutes

• Reset Equipment Times for: Blower, Compressor, Reheat 1, Humidifier,

Dehumidification, Reset All to Zero

• Audio Alarm Mode: None, Long, Full

• Automatic Self-Test Acknowledgment: On, Off

• Manual Diagnostics: Stay in Normal Menu Mode, Change to Diagnostic Mode

• Humidity Anticipation: On, Off

• Compressor Short Cycle Alarm: On, Off

• Dehumidification Mode: Compressor within Reheat Limits, Compressor with

No Reheat Limits, Dehumidification Off

• Define Password: 00-99

• Firestat Temperature Alarm Limit: Unit Shutdown & Alarm @ 100-150° F

• Low Discharge Temperature Alarm Limit*- 45-60° F/7.2-15.6° C,

Disable Low Discharge Temperature Alarm

• Power Failure or Restart Mode: Automatic, Manual

• System Start Delay: 0-10 Minutes in 5 Second Increments

• Message for Optional Alarm 1, 2, 3, & 4

Custom Message*

Fan Motor Overload*

Local Alarm

Standby Pump On*

UPS/Alternate Power On*

Reheat Inhibited

Humidification Inhibited

Reheat & Humidification Inhibited

• Delay for Optional Alarm 1, 2, 3, & 4: 0-900 Seconds, Off

• Person to Contact on Alarm

Contact Message Not Used

Data Processing Manager

Maintenance Engineer

Service Company 

25 Space Custom Message*

• Scheduled Normal Maintenance: 1 - 1000 Hours

• Control Logic: Smart Logic, PID, Setpoint Deviation

• Reheat Stage: None, 1, 3.Temperature Scale: Fahrenheit, Centigrade

• Calibrate Temperature Sensor: +9.9° F/C

• Calibrate Humidity Sensor: + 30percent RH

• Unit & Network ID Number: 0-260

• Calibrate Discharge Air Sensor*:+9.9° F/C

• Remote Alarm 1, 2, 3 Selection*

Compressor Short Cycle

Custom Message 1, 2, 3, & 4*

Dirty Filter

Discharge Air Sensor Problem*

Fan Motor Overload*

Firestat

High Humidity

Compressor High Pressure

High Temperature

Humidifier Problem

Humidifier Sensor Problem

Local Alarm 1, 2, 3, & 4*

Low Humidity

Compressor Low Pressure

Low Temperature

Low Voltage

Maintenance Required

Manual Override

No Airflow

No Water Flow*

Power Problem or Restart

Smoke Detector*

Standby Pump On*

Temperature Sensor Problem

Water Detection Probe

UPS/Alternate Power On

Reheat Inhibited

Humidification Inhibited

Reheat & Humidification Inhibited

• Humidifier:

None

Computer, Non-Modulating

Computer, Modulating*

Comfort, Non-Modulating

Comfort, Modulating

• Water Valve Voltage Range: 0 - 10 VDC, 4 - 7 VDC, 6 - 9 VDC, 7 - 10 VDC

• Reversing Acting Valve: Yes, No

 

 

DISPLAYED CONDITIONS, DATA & FUNCTIONS - The Data Alarm Processor-II displays and monitors the following conditions, data, and functions:

 

• Temperature Setpoint

• Humidity Setpoint

• Current Temperature

• Current Humidity

• Current Percent of Capacity Utilized

• Current Discharge Air Temperature*

• Unit or Network ID Number

• Zone Number

• Cooling

• Reheat

• Humidifcation

• Dehumidification

 

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

• Compressor High Pressure

• Compressor Low Pressure

• Under Floor Water Detection

• No Air Flow

• Dirty Filter

• Humidifier Failure

• Manual Override

• Firestat Tripped

• Low Voltage Warning

• Power Failure Restart

• Compressor Short Cycle

• Temperature Sensor Error

• Humidity Sensor Error

• Maintenance Required

• Custom Message*

• Local Alarm*

• Discharge Air Sensor Error*

• Fan Motor Overload*

• No Water Flow*

• Smoke Detector

• Standby Pump On*

• Person to Contact on Alarm*

 

*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.

 

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 percent of Capacity Last Hour

• Alarm History, Last 10 Alarms

• Equipment Runtimes

 

OPTIONAL FEATURES

 

• Analog Inputs

• RS-485 Network

• Two Additional Remote Alarms

• Humidifier Flush Rate

• Modulating Humidifier Control

 

OPTIONS

 

Data Aire Remote Telecommunications System - 200™

 

The Data Aire Remote Telecommunications System - 200 (DART-200™ ) provides comprehensive monitoring and control of Data Aire units via a phone modem to a host PC station. The Data Aire units are interfaced with a communication module (DART-Board) by a two wire connection. The DART-200 allows complete remote control of Data Aire units through the unit mounted Data Alarm Processor-II and retrieval of all historical data. Upon an alarm at the unit, the DART-Board will automatically dial one or two pre-programmed numbers using an integral modem and transmit specific alarm information. All entry or configuration capabilities that are available at the Data Alarm Processor-II are accessible at the host station. The commands or requests for data from each are processed through the DART-Board. A single DART-Board will allow up to 32Data Aire units to be connected and controlled. The DART-200 is capable of monitoring and controlling up to 200 DART-Boards.

 

SYSTEM FEATURES

 

• Automatic Scrolling of Current Status

• Automatic Scrolling of Sensor Readings

• Sensor Database

• Sequential Display of Alarms

• Password Access

• Multiple Audio Alarm Modes

• Automatic Status Log Prints          

• Custom "Help" Messages for Alarms

 

PROGRAMMABLE FUNCTIONS

 

• Temperature Setpoint

• Humidity Sepoint

• Temperature High Limit

• Humidity High Limit

• Temperature Low Limit

• Humidity Low Limit

• Temperature Sensitivity (Deadband)

• Humidity Sensitivity (Deadband)

• On/Off/Standby Operation

• Unit Rotation

• Unit ID Number

• Zone Number

• Password

 

MONITORED CONDITIONS

 

• Specific Alarms from Unit(s)

• All Standard Alarms from Unit(s)

• Programmed Local Alarms from Unit(s)

• Current Operating Mode

• Current Temperature Sensor Readings

• Current Humidity Sensor Readings

 

HISTORICAL DATA

 

• Alarm History for Last 10 Alarms in Order of Occurrence and Time Since Detected

• Equipment Runtimes for: Evaporator Motor, Compressor, Reheat, Humidification, Dehumidification

• Current and Average Percent of Capacity for Last Hour

 

Remote Temperature & 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 will sound an alarm and display "SMOKE DETECTOR: UNIT SHUTDOWN" 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 prevents access to the high voltage electrical components until switched to the "OFF" position. The operating mechanism (handle) protrudes through the decorative door.Steam Generator Humidifier with Modulating Control - Modulating control may be added to the steam generator humidifier. Modulating control will allow the humidifier to automatically adjust steam output to match changing room conditions. Self-regulating auto flush is included.

 

3-Way Water Regulating Valve - A 3- way water regulating valve for head pressure control may be ordered to replace standard 2-way valve installed in unit. The 3-way valve controls the water/glycol flow rate to meet the heat rejection requirements under varying conditions.

 

Condensate Pump - Condensate pumps may ordered as factory installed or for field installation. Condensate pumps are complete with sump, motor, and automatic control. The pumps are rated for 130 GPH @ 20 foot maximum or 40 GPH @ 20 feet with check valve. Pumps shipped loose are available in 115, 230, or 460 volt. If unit mounted and wired, the pump will match the unit voltage. Not available in 575 volt.

 

Upflow Plenum - Upflow plenums are fully insulated and have front discharge air grille. Side grilles for both or one side are available. Plenums are 18 inches high and are painted to match the unit color.

 

Floorstand - Floorstands are adjustable +/- 2 inches and may be ordered with a factory installed turning vane or with seismic construction.

 

60 percent Efficient Filter - The standard 30 percent efficient filter may be replaced with 60 percent efficient filter (based on ASHRAE Std. 52-76). Filters are 4 inch deep, pleated type. (Note: Higher efficiency filters are available - consult factory regarding efficiency percentage and unit static pressures)

 

1" Pre-Filter - Units may be ordered with a one inch pre-filter.

 

Pump Package - Centrifugal pump packages are available to circulate water or water/glycol solution. Pumps are available in various horsepower and voltage. Both 3400 and 1750 rpm pumps are available as an option. Pumps ship loose or come mounted in an optional pump enclosure.

 

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: CHECK PRIMARY PUMP") will be displayed on the unit microprocessor display.

 

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. (* Due to the size of some pumps, a special oversized enclosure can be made available.)

 

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. Shut-off valves and flow switch are included. This configuration greatly reduces field installation procedures.

 

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.