Dataaire manual

Data Aire can show you how to navigate the latest requirements, including using the correct efficiency ratings and ensuring certification compliance. Balancing temperature, humidity and CO2 level is a complex juggling act. Input from top engineers who designed over grow rooms helped us create a heavy-duty commercial solution that helps optimize yields through precise, harmonious control. Understand the unique challenges you may face, maximize your investment in HVAC technology and protect your assets most effectively..

Think Strategically. Control Tactically. Why are economization solutions more important than ever? Learn how to achieve year-round economization with your precision cooling system.

Smarter Control is Here. Spreader bars are recommended for lifting multiple fan units. Under no circumstances should the coil headers or piping be used for lifting the unit. Ideally, the unit should be kept in its shipping crate until it is ready to be set in place.

Note: Failure to extend the legs will result in poor air distribution over the cooling coil resulting in significant capacity reduction and potential high discharge pressure problems.

Concrete pads or a rail system are often used to provide support for the heat exchanger. Bolt holes in the bottom of each leg can be used to anchor the unit. Short circuiting of the air flow or the intake of warmer air from another unit will seriously degrade the performance of the air cooled heat exchanger. Do not locate the heat exchanger in a location that is bordered by tall obstructions i. See Figure at right for minimum clearance from obstructions and between units.

With proper clearance on all sides, two units can be placed side by side. Additional units should be placed at least 48 inches apart. Proximity to windows, walls, and surrounding structures can cause objections by the occupants.

An acoustical expert should be consulted when noise is of a particular concern. Air cooled heat exchangers should be placed at a level that is higher than the indoor evaporator. Mounting the remote heat exchanger condenser or condensing unit more than 10 feet below the evaporator is not recommended.

Excessive liquid line pressure drop can cause poor evaporator performance. Piping must be supported within 18 inches of the inlet and outlet connections. The inlet connection is located on the top header on all remote heat exchangers and the outlet connection is located on the bottom header of all units.

On singlefan condensers this is the only means of control. A variable speed controller modulates the motor speed based on system head pressure. The fan speed controller will normally not require field adjustment. Air cooled condensers should be placed at a level that is above the level of the indoor evaporator.

Mounting a condenser or condensing unit more than ten feet below the evaporator is not recommended. The fan motor will only have a thermostat if the unit has an energy saver coil. Without the optional energy saver coil, the first fan motor runs whenever there is a call for cooling via an auxiliary signal sent by the indoor evaporator see also Section 3. The water-sensing thermostats have adjustable setpoints which are typically staggered to maintain o water temperature in the 85 to F range.

This is generally the desired range for glycol cooled systems. When incoming fluid falls below the setpoint of a o water-sensing thermostat in the evaporator typically about 50 F , energy saver cooling becomes available. Systems with an energy saver coil should have at least one fluid-sensing thermostat on the fluid cooler set lower to take advantage of colder ambient temperatures. The desired fluid temperature o for energy saver cooling is 45 F. Field adjustment of fluid-sensing thermostats is not unusual.

It is desirable to use the energy saver mode as much as possible. However, fluid temperature that 18 is too cold can cause excessive dehumidification and coil sweating. Fluid temperature that is too high can cause the indoor space temperature to rise.

This can cause the optional microprocessor controls to lock out the energy saver mode for one hour while it reverts back to compressorized cooling. Adjust the setpoints of the thermostats to allow the maximum free cooling time. Overcooling or undercooling the fluid should be avoided. Therefore it is not possible to dictate the exact water-sensing thermostat setpoints.

Field adjustments are typical to allow fine-tuning to specific conditions 5. Package Air Cooled Systems Package air cooled units come factory charged because, even though the condenser blower section ships loose, all of the refrigerant carrying components are self-contained within the evaporator section.

A properly charged system operating at typical parameters will have a head pressure of to psi. Suction temperature should be 58 psi or greater. The superheat at the compressor suction line o at least 6 inches away from the compressor should be F.

An air cooled package unit may require field charging if a compressor is changed, if a leak develops or if non-condensables are in the system. Field charging should be done by referring to the unit electrical nameplate for the factory charge. Although this figure represents the original factory charge, it is still necessary to measure and note proper unit operation including superheat, head and suction pressure. Some adjustment to charge may be required. Before starting a compressor, the crankcase heater should be energized for a minimum of 12 hours to reduce the possibility of liquid slugging on start-up.

Failure to energize the crankcase heater could result in compressor damage. Charge with approximately three lbs. Charge with about nine lbs. It is likely that more refrigerant will be required to complete the charging procedure. Make sure all hoses are properly purged. Failure to energize the crankcase heater could result in compressor damage Start the evaporator fan and compressor.

Check the liquid line sight glass to get a feel for the approximate charge. Bubbles in the sight glass are not unusual at this point and can be caused by flashing from liquid line pressure drop, low subcooling or low charge. The unit should be allowed to stabilize for several minutes before meaningful measurements can be taken. The super heat at the compressor suction line at least six o inches away from the compressor should be F.

Note: Charging to a full liquid line sight glass should never be the sole means of determining the correct refrigerant charge. Other parameters such as superheat, suction pressure, head pressure, subcooling and ambient temperature are also important parameters. A system charged to a clear sight glass is often over-charged. Connect the refrigerant drum to the low side of the system. Charge with approximately three pounds per nominal ton plus the line set. Charge circuit with about six pounds of refrigerant to begin.

For example, a model DAMA is a nominal 2 ton unit. Charge with about six lbs. Before starting a compressor, if the system has a refrigerant holding charge, the crankcase heater should be energized for a minimum of 12 hours to reduce the possibility of liquid slugging on start-up. If the system is charged from a vacuum, the pre-heating of the compressor is not necessary, start the system and allow the system to stabilize to room temperature.

Bubbles in the sight glass are not unusual at this point and can be caused by flashing from liquid line pressure drop, low sub-cool, or low charge.

After the system is allowed to stabilize, verification of a few key measurements should be noted. Units with remote o condensing units the superheat should be 20 to 25 F at the compressor, the subcooling will be the o same 8 to 10 F.

Flooded System Charging Flooded systems are units having refrigerant circuits with an optional liquid receiver and head pressure control valve.

When the ambient temperature falls during cold weather, the head pressure control valve will regulate the flow of refrigerant to ensure nearly constant receiver pressure. The condenser is partially flooded with liquid in cold weather. In warm weather the extra refrigerant is stored in the receiver.

Flooded systems require more refrigerant than fan speed control systems. Start the blower and then the compressor checking the operating pressures and temperatures. If the unit has a holding charge, before starting a compressor, the crankcase heaters should be energized for a minimum of 12 hours to reduce the possibility of liquid slugging on startup.

Failure to energize crankcase heaters could result in compressor damage. Start the evaporator fan, verify correct fan rotation, then start the compressor. Adjust the refrigerant charge until the sight glass clears or has only sparse bubbles. If the receiver head pressure is below psi, block part of the condenser coil surface until the pressure rises to psi or higher.

During extremely cold weather, all of the condenser fans may have to be de-energized to maintain psi. Observe the sight glass on the receiver. Observing the receiver sight glass becomes difficult when they are remote mounted near the condenser.

After the system is allowed to stabilize, the superheat at the compressor suction line at least six o inches away from the compressor should be F. Units with remote condensing DRCU units o the superheat should be 20 to 25 F at the compressor, the subcooling will be the same 8 to 10O F as the standard unit.

Remove the block from the condenser coil. If the ambient temperature while charging is below about 60o F some of the refrigerant will be backed up in the condenser coil, causing the liquid level in the receiver to drop. The water regulating valve should be adjusted to maintain to psi head pressure. The superheat at the compressor suction line at least six inches away from the compressor should be degrees. Adjust the refrigerant charge until the sight glass has sparse bubbles.

The unit should be allowed to stabilize for several minutes before meaningful measurements can be taken and the conditioned room should be at or near the temperature setpoint. A head pressure sensing transducer is connected to a shrader fitting on the discharge line and water is regulated into the condenser coil.

Condenser coils may be plate fin or coaxial type. Before starting a compressor, if there has been a refrigerant holding charge, the crankcase heaters should be energized for a minimum of 12 hours to reduce the possibility of liquid slugging on start-up. Technicians who service and dispose of air conditioning and refrigeration equipment must recover the refrigerant instead of venting to atmosphere. Refrigerant purchasers must be certified technicians and have a valid EPA certification card.

These are factory adjusted to their nominal rating. Any field adjustment should be to fine tune a system that has stabilized and already has acceptable operating parameters.

High Pressure Cutout Switch Each refrigerant circuit is protected by a high head pressure cutout switch with a manual reset button. The cutout pressure rating for refrigerant R or RC is psi. Physical location is near the compressor which may be either in the evaporator or the condensing section. Low Pressure Cutout Switch Each circuit also contains a low suction pressure cutout switch with automatic reset. The cutout pressure rating for this switch is 30 psi.

Physical location is near the compressor which can be either in the evaporator or the condensing section. To achieve the approximate glycol concentration, it is necessary to know the total system volume.

This consists of the sum of the fluid cooler volume, the evaporator unit volume, and the volume of the interconnecting piping.

The following tables can be used for arriving at an approximate system volume. After installation, the glycol percentage should be checked. The glycol percentage should also be checked at regular intervals to ensure freeze protection. This control cannot be used with optional reheat or humidifier options.

There is a separate manual that goes into extensive detail regarding functions, features, programming and troubleshooting. This manual must be referenced to complete a thorough unit installation. Secondary heat exchangers have separate installation and operation manuals which give complete details on adjusting thermostat settings, etc. Refer also to details in Section 3. The intent is to allow the technician to understand the wiring details associated with the electrical components and how they interface with the controls as well as peripheral equipment, including secondary heat exchangers.

The wiring diagram in the evaporator will indicate field interface terminals to the secondary heat exchanger. The internal wiring of the heat exchanger is found on a separate diagram which can be found on the inside cover of the heat exchanger electrical box.

An example of a typical diagram is DRC-S An example of a typical diagram is DFC-S This will ensure efficient operation of the unit. Spare filters should be kept in stock as these tend to be a frequently replaced maintenance item. Filters may require changing as often as monthly. Note also that construction dust on new installations will quickly clog new filters. Although the unit may have a dirty filter alarm, this should not be relied on as the only determinant for replacing filters.

A mis-adjusted filter differential pressure switch may not give a proper indication of a clogged filter. If the alarm energizes prematurely or does not energize at all, the pressure switch should be adjusted.

Panels must remain closed when determining if an adjustment is necessary. Filters that require changing can restrict airflow and create problems such as coil icing or poor air distribution.

If tightening is required, loosen the four motor mounting bolts. Turn the adjustment screw on the end of the motor mounting channel until the proper belt tension is attained. Retighten the four mounting bolts. Damage can occur to belts that are overtightened.

When tightening the belts make sure the pulley alignment is true. If the belts are over tightened or if the pulleys are mis-aligned the bearing life and belt life is shortened considerably. This frequency will depend on usage and water type. For instance compressors and motors are inductive loads which require time delay fuses. Electric reheat and humidifiers are resistive loads requiring fast acting fuses.

However sometimes they may accumulate a film of dust or dirt when unused for extended periods of time. When energized, the burning debris can create smoke or unpleasant odor. To help avoid this, periodic cleaning is recommended. When replacing compressors or other repairs that open the refrigeration system to atmosphere, it is advisable to replace the filter drier. The equivalent type and size should be used. This agreement to repair or replace defective parts is expressly in lieu of all other warranties, expressed or implied and all other obligations or liabilities on the part of Seller and Seller neither assumes nor authorizes any other person to assume for it any liability or obligation in connection with the sales or service of its equipment, except said repair or replacement of defective parts set forth above.

This warranty does not include any labor charges for work done outside of the factory for replacement of parts, adjustments, repairs, or any other work. This warranty shall not cover the repair or replacement of any equipment which has been repaired or altered outside of the factory in any way or which has been subject to negligence, misuse, or abuse, or to pressures in excess of stated limits.

This warranty applies only to the original purchaser of the equipment and does not extend, expressly or by implication, to the third parties or others without the specific written approval and acknowledgment of Seller. In Addition, Seller shall not be liable for any cost or expense of replacement or repair contracted for by Buyer with any third person, unless, and then only to the extent that Seller authorizes in writing, such costs or expense.

Seller shall not be liable for any direct, indirect incidental, consequential, or other form of loss, injury, damage, cost, or expense, whether caused by delay, failure, or performance, breach of warranty, or by any cause whatsoever.

Vertical lift b. High friction loss c. Long or small line d. Plugged drier or strainer Low pressure drop across valve a. Same as 11 above b. Undersized distributor nozzle or circuits c. Poor thermal contact b. Warm location Wrong thermostatic charge Bad compressor - low capacity Moisture, dirt, wax Incorrectly located external equalizer Low Suction Pressure - Low Superheat 1. Low load a. Not enough air b. Dirty air filters c. Coil icing 2. Poor air distribution 3. Poor refrigerant distribution 4.