Mini Ceiling Unit

DESIGN FEATURES

Data Aire’s Mini Ceiling Series is the perfect environmental control system for small computer centers, electronic, telephone, and battery rooms, or wherever spot cooling may be necessary and space is a problem. While vertical supply/return air units are designed to fit in a 2 ft x 4 ft standard T-bar ceiling grid space, horizontal units hang in the ceiling space with duct work connected to supply and return connections. The system offers an unsurpassed combination of features and options along with a high standard of performance. Mini Ceiling Systems are available as air cooled, water cooled, or chilled water systems with a variety of return and supply air arrangements. Air cooled can be specified as packaged indoor units or split systems with either remote outdoor condensers or condensing units.

 

CONTROLS

Precise temperature regulation is provided by a built-in control system. All electrical components, including capacitors, contactors, relays and control transformers are pre-wired and contained in an electrical box that is hinged and swings out for easy access and servicing. A factory installed microswitch will disable the unit prior to condensate pan overflow should the drain line become plugged with debris. Each unit is shipped with a thermostat and subbase as standard. A red indicator light is unit mounted to indicate a condensate problem. Units with the optional Data Alarm Mini Processor II have a condensate pan high water level alarm standard.

 

CABINET

Units are designed with a supply and return air plenum that fits in a 2 ft. x 4 ft. opening of a standard dropped ceiling grid. The field installed supply and return air plenum is constructed of aluminum and finished with off-white textured paint. Both the supply and return air grilles are hinged for easy access when replacing filters. A 2 inch, 30% efficient filter (based on ASHRAE Std. 52-76)MERV 8 is provided behind the return air grille. Mini Ceiling Systems are constructed with tubular steel frames for strength and service access. Removable panels of galvanized steel are lined with 1/2 inch thick, closed cell insulation for quiet and efficient operation.

 

EVAPORATOR SECTION

The evaporator coil contained in each unit is constructed with copper tubes and aluminum fins mounted in a stainless steel drain pan. The drain pan is made witha bottom drain connection and installed in a manner that provides a positive drain to prevent standing water in the condensate pan. The refrigeration circuit includes a scroll compressor with internal overload protection and crankcase heater. The circuit includes an expansion valve with an external equalizer, filter drier, sight-glass, and high and low pressure safety switches. The high and low pressure safety switches are connected to the refrigerant system with a Schrader fitting that allows replacement without affecting the refrigerant charge, making recovery unnecessary.

 

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

 

SELF-CONTAINED UNITS

 

Air Cooled - The cabinet houses the evaporator section, evaporator blower assembly, filter section (located in air distribution plenum) and the condenser coil. The condenser coil is constructed of copper tubes and aluminum fins. The condenser blower section is field installed. The condenser fan is double inlet, double width, with direct drive type two-speed motor that is controlled with a temperature operated switch. The condenser blower motor electrical connection is through a factory wired plug.

 

Water Cooled - The cabinet houses the evaporator section, evaporator blower assembly, and filter section (located in air distribution plenum). In addition, a high efficiency coaxial condenser with head pressure activated 2-way water regulating valve is built into the refrigeration system and is contained in the evaporator section. The capillary tube connection from the water regulating valve to the refrigerant system is connected with a Schrader fitting that allows replacement without affecting the refrigerant charge, making recovery unnecessary.

 

Chilled Water - All components are housed within the cabinet. Chilled water units utilize an existing chilled water loop. Chilled water flow is controlled by a 2-way valve for accurate and economical temperature control and dehumidification. The maximum operating water pressure is 150 psi.

 

SPLIT SYSTEMS

 

Air cooled systems are available with an outdoor condensing unit or remote air cooled condenser.

 

Outdoor Condensing Unit - The outdoor condensing unit contains the scroll compressor, sight-glass, filter drier, high and low pressure safety switches, and condenser coil. The high and low pressure safety switches are connected to the refrigerant system with a Schrader fitting that allows replacement without affecting the refrigerant charge, making recovery unnecessary. The condenser coil is constructed with copper tubes and aluminum fins. Air discharge is vertical.The condenser fan is variable speed for head pressure control down to -20 degrees F. The capillary tube connection from the fan speed control to the refrigerant system is connected with a Schrader fitting that allows replacement without affecting the refrigerant charge, making recovery unnecessary. Field piping and wiring is required from the condensing unit to the indoor evaporator section.

 

Remote Outdoor Air Cooled Condenser - Condensers are industrial duty design with galvanized corrosion resistant housing, aluminum finned/copper tube coils, coated fan guard, energy efficient, thermally protected motor, and variable fan speed control with an integral factory wired and tested control panel. The capillary tube connection from the fan speed control to the refrigerant system is connected with a Schrader fitting that allows replacement without affecting the refrigerant charge, making recovery unnecessary. Air discharge is vertical. Field piping and wiring is required from the condenser to the indoor compressor/evaporator section.

 

OPTIONS

 

Data Alarm Mini Processor II – The microprocessor based Data Alarm Mini Processor II is wall mounted and has a single row, 16 character liquid crystal display (LCD) in clear vernacular format. The Data Alarm Mini Processor II not only controls and monitors your room’s temperature, humidity, air flow and cleanliness, but also provides alarm history and an automatic self-test of the microprocessor system start-up. Multiple messages will be displayed by automatically scrolling from each message to the next. Multiple alarms will be displayed sequentially in order of occurrence.

 

Operation – Unit on/off operation is controlled by a slide switch and push button control switches which allow menu selection for programming, operational information, diagnostics, and historical data. A password feature prevents unauthorized access. Menu programmed information for basic system operation and alarm parameters is non-volatile.

 

Programmable Functions/Monitoring – The user friendly switch permits step-by-step programming and display of the following functions:

 

• Temperature Setpoint – (60-80 deg F, 15.6-26.7 deg C)

• Temperature Sensitivity – (+1 to + 5 deg F or .5 to 2.7 deg C)

• Humidity Setpoint – (30-70% RH)

• Humidity Sensitivity – (+1 to +15% RH in 0.1% increments)

• Temperature Alarm Points – (50-90 deg F, 10-32.2 deg C)

• Humidity Alarm Points – (10-90% RH)

• Unit Start Time Delay

• Interstage Time Delay

• Password 1st Level

• Password 2nd Level

• Audio Alarm Level

• Restart Mode

• Firestat Trip Temperature

• Local Alarm Function

 

Normal functions are monitored and displayed on the LCD and include, in addition to the above set points, the following:

 

• Current Temperature (° F or ° C)

• Current Humidity (% RH)

• Cooling

• Reheat

• Humidification

• Dehumidification

• Date and Time

 

Alarms – Alarm conditions are monitored on the LCD and are enunciated by an audible alarm. The alarm silence button will quiet the audible alarm but the display will continue to indicate the alarm condition until the problem is corrected. The following alarms are standard:

 

• High Temperature

• Low Temperature

• High Humidity

• Low Humidity

• Compressor High Pressure

• Compressor Short Cycle

• High Condensate Water

• Firestat Tripped

• No Air Flow Alarm

• Temperature Sensor Failure

• Humidity Sensor Failure

 

Historical Data -The current temperature and humidity, with minimum and maximum readings for the last 24 hours of operation can be recalled and displayed. Alarm history of the last five alarms is maintained in sequential order.

 

Diagnostics – Automatic and manual diagnostics sequences simplify troubleshooting.

 

Each Data Alarm Mini Processor II is shipped with 25 feet of cable for field connection, (additional cable is available). Contact factory for cable lengths in excess of 75 feet.

 

Remote Mounted Temperature And Humidity Sensors

 

Temperature and humidity sensors are provided in a wall mounted plastic case for remote sensing of temperature and humidity. Standard unit sensors are removed. Requires field wiring of (field provided) shielded cable. Remote temperature and humidity sensors option only available when used with the Data Alarm Mini Processor II.

 

Steam Generator Humidifier

 

The steam generator humidifier eliminates air contamination caused by mineral deposits. The totally self-contained system includes a quick change, disposable cartridge and automatic flush cycle. Steam generator humidifier option only available when used with the Data Alarm Mini Processor.

 

Electric Reheat

 

Low-watt density finned tubular sheathed coils are constructed of stainless steel and provide ample capacity to maintain room drybulb conditions on a call for dehumidification. Low-watt density coils eliminate ionization associated with open wire electrical resistance heating. Over-heat switches are provided. Electric reheat is available in 2, 4, or 5 KW capacities, shipped factory installed with high limit cut-out.

 

Low Ambient Control Damper

 

A low ambient control damper is available for use with ducted outside condenser air. The low ambient control damper kit is field installed and consists of a 14″ x 14″ damper section and head pressure operator. The low ambient control damper allows unit to operate down to -30 degrees F (-34.4 degrees C). The capillary tube connection from the head pressure control to the refrigerant system is connected with a Schrader fitting that allows replacement without affecting the refrigerant charge, making recovery unnecessary.

 

Condensate Pumps

 

Condensate pumps can be provided for field mounting or factory installed and wired. The pump body can be placed within the unit coil pan. Maximum 8 ft. head. Field installed condensate pumps require either separate 110 or 230 volt power source.

 

Horizontal, Front, Side Supply Air

 

Units may be ordered with optional horizontal supply air configurations of front or either side. Optional supply air converts unit for ducted supply air connection.

 

Side Return Air

 

Units may be ordered with optional side return consisting of a factory modified flanged for ducting return air. Optional side return air converts unit for ducted return air connection. An additional option provides ceiling mounted return air filter grille, ceiling mounted return air filter box with hinged grille and filter for duct connection. Filter included with this option is a 20″ x 20″ x 4″ deep, 30% efficient (based on ASHRAE Std. 52-76) MERV 8 pleated filter.

 

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.