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Use two (2)

lbs. per nominal ton and using a “liquid charging adapter” add the calculated system charge

at the condenser through the liquid line and discharge line with liquid refrigerant. A “liquid charging
adapter” is needed so liquid refrigerant doesn’t enter the compressor. At this point the receiver(s) are
pre-charged.

Table 17 Refrigerant Receiver Charging Chart

Model

Size (Tons)

Single Circuit

lbs./circuit (kg/circuit)

R-410A

Single Circuit

lbs./circuit (kg/circuit)

R-407C

GHRC

DARC

011 thru 039

(3 thru 11)

27.3 (12.3)

29.2 (13.2)

GHRC

DARC

053 thru 074

(15 thru 37)

59.0 (26.8)

63.1 (28.6)

GHRC

DARC

141 thru 215

(40 thru 61)

103.8 (47.1)

110.9 (50.3)

GHRC

DARC

264 thru 352

(75 thru 100)

165.7 (75.1)

177.1 (80.3)

Charge Fixed Speed Compressor

While charging, if the receiver (head) pressure is below the value shown in the

Table 18 Discharge

Head Pressure

below for the refrigerant type used, block part of the condenser coil surface or turn OFF

the fans until the pressure rises to the value shown in the table, while observing the receiver sight glass.
During extremely cold weather, all the condenser fans may need to be deenergized to allow head
pressure to increase.

Once you reach the pressure value shown below, enable the condenser fans and

continue to charge each circuit until it reaches the value shown.

Table 18 Discharge Head Pressure

Refrigerant

Head Pressure

R-410A

380 PSIG (2620 kPa) or higher

R-407C

230 PSIG (1586 kPa) or higher

While charging during the summer, meter refrigerant through the suction line until the level of liquid in
the receiver sight glass is approximately 1/3 from the bottom (the level ball in the receiver will start to
float) of the sight glass. A liquid charging adapter should be used to prevent liquid refrigerant from
entering the compressor. Charge each circuit to the value shown in

Table 19 Packaged Units without

or

Table 20 Packaged Units with Receivers

See

5.8.3 Charging the Fixed Speed

Compressor for charging the fixed speed compressor except use

the table below for the proper charge conditions.

Water/Glycol-Cooled System Charging

All water/glycol cooled units are factory charged with refrigerant. The superheat at the compressor
suction line at least 6 inches (152 mm) away from the compressor. The water regulating valve should
be adjusted to maintain the required conditions. Field charging, if required, of water/glycol systems
should be done by referring to the unit’s electrical nameplate. The factory charge is indicated on the

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Содержание DA PA-04

Страница 1: ......

Страница 2: ...kground in areas such as HVAC electrical plumbing and electronics as applicable WARNING Service performed by unauthorized or unqualified technicians may void manufacturers warranties and could result in property damage and or personal injury Safety Alert Symbols and Words for Hazard Alerting Safety DANGER Indicates a hazardous situation which if not avoided will result in serious injury or death W...

Страница 3: ...Discharge Lines 18 Liquid Lines 20 Suction Lines 20 Recommended Line Sizing 20 Hot Gas Lines 21 Liquid Lines 21 Suction Lines 21 Connection Sizes Air Cooled Units 22 Connection Sizes Water Glycol Cooled Units 22 Connection Sizes Chilled Water Units 22 Field Piping Remote Condenser Condensing Unit Above Evaporator 23 Field Piping Remote Condenser Condensing Unit Below Evaporator 24 Connection Sizes...

Страница 4: ...ation 45 Third Stage Evacuation 45 Final Evacuation Stage 46 General Pre Charging Guidelines 46 Voltage Phase Check 47 Evaporator Power Phase Check 47 Fixed Speed Scroll Compressor Phase Check 47 Heat Exchanger Phase Check 48 GHRC Air Cooled Heat Exchanger Phase Check 48 DARC Heat Exchangers Phase Check 48 Line Set Charge Calculations 48 Component Functional Test 49 Charging Procedures 49 Refriger...

Страница 5: ...CE ITEMS 67 Air Filters 67 Belts 67 Bearings 67 Fuses 68 Electric Reheat 68 Humidifier 68 Humidifier Canisters 68 Refrigerant Filter Drier 68 EC Plenum Plug Fans 69 Electronically Commutated Motors 69 EC Motor Testing 70 MAINTENANCE INSPECTION CHECKLIST 71 Frequently Asked Questions FAQ 74 Electrical FAQ Section 74 Mechanical FAQ Section 75 Contact Data Aire 78 TABLE OF FIGURES Figure 1 Typical In...

Страница 6: ...d Line Multiplier 48 Table 12 Liquid Line Multiplier for R 410A at Various Line Lengths 49 Table 13 Liquid Line Multiplier for R 407C at Various Line Lengths 49 Table 14 DAPA Starting Charge R 410A 51 Table 15 DAPA Starting Charge R 407C 51 Table 16 Refrigerant Charge Values 53 Table 17 Refrigerant Receiver Charging Chart 58 Table 18 Discharge Head Pressure 58 Table 19 Packaged Units without Recei...

Страница 7: ...to the unit must be no cooler than the ASHRAE recommendation for proper unit operation Operating below this can alter the operating performance and decrease equipment reliability Refer to ASHRAE s publication Thermal Guidelines for Data Processing Environments Model Identification DAP X XX X X X XX Mini Plus Ceiling System DAP Model Number 2 5 Tons 03 Tons 04 Tons 05 Tons Auxiliary Coils Voltage P...

Страница 8: ...details NOTICE Any external damage or transportation damage on the freight carrier s forms Inspect the unit itself for internal damage A claim should be filed with the shipping company if the equipment is damaged or incomplete NOTICE Freight damage claims are the responsibility of the purchaser Action to recover losses should be filed immediately Please notify factory personnel of any claims Paper...

Страница 9: ...howing the condition of the unit and noting any discrepancies A copy of the log sheet should be sent to Data Aire Failure to perform the long term storage requirements may void the warranty CAUTION A complete system drain down after factory functional testing cannot be assured for this product Therefore if exposed to freezing conditions rupture piping and component may occur Suggested Reference St...

Страница 10: ... sources Isolate from direct sun light Isolate from storage of hazardous materials and substances Refrigerant coils have been evacuated and pre charged with slight 1 to 3 PSIG 6 9 to 20 7 kPa nitrogen holding charge DO NOT damage or disturb these coils and connections Water coils must have all inlet and outlet connections capped or closed tight to prevent foreign materials and liquids from gaining...

Страница 11: ...training that will enable them to perform their assigned tasks properly and safely It is essential that prior to performing any task on this equipment this individual shall have read and understood this document and any referenced materials This individual shall also be familiar with and comply with all applicable governmental standards and regulations pertaining to the task in question This manua...

Страница 12: ...let jacks If using a forklift or pallet jack make sure that the forks if adjustable are spread to the widest allowable distance that will fit under the skid Ensure the fork length is suitable for the unit length Keep tines of the forklift level and at a height suitable to fit below the skid and or unit to prevent exterior and or underside damage When moving the packaged Data Aire unit with a forkl...

Страница 13: ...m of polyethylene is often used on walls and ceilings Walls and floors must also be painted with vapor seal paint All doors to the controlled space should be equipped with weather seals to prevent the infiltration of non neutral conditioned air from entering the space Failure to provide a vapor barrier can compromise the ability to control space conditions Introduction of outside air into the spac...

Страница 14: ... safe distance from the unit The unit may be too tall to fit through a doorway while on the skid Measure the unit and doorway heights and refer to the installation plans to verify clearances prior to moving the unit WARNING Use care when moving Improper handling could result in injury Proper care should be taken when uncrating the unit The packaging has wrapping bands with sharp edges that are und...

Страница 15: ...Figure 1 Typical Installation Methods for typical DAP installation method Raise the evaporator section with an appropriate lifting device Attach washers nuts and jam nuts to each threaded rod Tighten the nuts so the weight is supported evenly by the four rods and the unit is level Vertical Airflow Units The evaporator sections with optional vertical airflow available on 2 5 and 3 Ton units only ar...

Страница 16: ... Typical Installation Methods NOTES 1 The unit must be level when installation is complete 2 Add an additional 4 1 2 for an Energy Saver or Auxiliary Chilled Water coil option Figure 2 Typical Installation Details ...

Страница 17: ... to these units as well These remote outdoor condenser or condensing units outdoor sections have their own installation operation and maintenance manuals Piping All refrigerant piping should be is Type L Air Conditioning Refrigeration ACR hard drawn copper pipes Soft copper is unacceptable When brazing refrigerant lines an inert gas should be passed through the line at low pressure to prevent scal...

Страница 18: ...one above the other Ensure that the tubing surfaces to be brazed are clean and that all burrs have been removed from the ends of the tubes Ensure that all loose material has been cleaned from inside the tubing before brazing Keep piping clean and dry especially on units with R 410A refrigerant Split Air Cooled Unit Piping Air cooled unit piping is crimped and brazed closed from the factory and con...

Страница 19: ... prevent flow from the condenser to the compressor during the off cycle The evaporator section ships with a nitrogen holding charge Do not vent the evaporator until all refrigerant piping is in place ready for connection to the evaporator and condenser The discharge suction and liquid lines need to be refrigerant grade copper and in accordance with local code All refrigeration piping should be ins...

Страница 20: ...ze is determined by pressure drop and velocity The liquid line pressure drop should not exceed 9 PSI 62 kPa for R 410A and 5 PSI 35 kPa for R 407C The recommended liquid velocity should be between 200 and 300 FPM 1 to 1 5 m sec To avoid excessive liquid line pressure drop the air cooled condenser should be located above or at the same level as the evaporator Condenser installations more than 15 fe...

Страница 21: ...3 8 1 2 1 2 1 2 3 1 2 1 2 5 8 5 8 4 1 2 1 2 5 8 5 8 5 1 2 5 8 5 8 5 8 Suction Lines Table 4 Suction Lines Inches OD Unit Tonnage Equivalent Feet Meters 50 15 2 100 30 5 150 45 7 200 61 0 Horizontal Vertical Down Vertical Up Horizontal Vertical Down Vertical Up Horizontal Vertical Down Vertical Up Horizontal Vertical Down Vertical Up 6 7 8 7 8 7 8 7 8 7 8 7 8 7 8 7 8 8 7 8 7 8 7 8 7 8 7 8 7 8 7 8 7...

Страница 22: ...ly be the same as the field pipe size required In some cases these sizes will vary significantly Connection Sizes Water Glycol Cooled Units Table 6 Connection Sizes Water Glycol Cooled Units Inches OD Model Number Condenser Water In Supply Condenser Water Out Return DAPA 2 5 3 4 3 4 DAPA 03 3 4 3 4 DAPA 04 1 1 8 1 1 8 DAPA 05 1 1 8 1 1 8 Connection Sizes Chilled Water Units Table 7 Connection Size...

Страница 23: ...he check valves are included internally in the evaporator section 4 Slope horizontal lines downward in the direction of the refrigerant flow 1 2 13 mm for every 10 feet 3 1 meters of line length 5 Inverted trap to extend 8 203 mm above the bottom of the condenser coil Additionally inverted traps are needed at the top of every gas line riser 6 Typical trap height is 5 to 7 127 to 178 mm limit the h...

Страница 24: ...g All piping to be per local and or state code 2 Condenser to be no more than 15 feet 4 6 M below evaporator 3 Slope horizontal lines downward in the direction of the refrigerant flow 1 2 13 mm for every 10 3 1 M feet of line length 4 Inverted trap needed on suction lines when compressor is outdoors only ...

Страница 25: ...cooling the fluid should be avoided NOTE Every application will have a different ambient temperature and indoor heat load air distribution profile Therefore it is not possible to dictate the exact water sensing thermostat setpoints Field adjustments are typical to allow fine tuning to specific conditions The water sensing thermostats on the outdoor fluid cooler section have adjustable set points w...

Страница 26: ...nsate drain piping from the unit for cleaning 5 Drain lines should be pitched downward not less than 1 4 6 35 mm for each ten 10 feet 3 1 M of horizontal run 6 Where local codes permit PVC pipe may be used 7 Ceiling units with an optional vertical discharge have a 5 127 mm plenum below the evaporator drain pan The plenum has knockouts that allow routing of the field supplied and installed condensa...

Страница 27: ...water supply to the humidifier Improper installation application and service may result in water leakage from the unit Water leakage can result in severe property damage and loss of critical data center equipment Do not locate unit directly above any equipment that could sustain water damage It is recommended to install leak detection equipment for unit and supply lines Condensate Trap Probably th...

Страница 28: ... 2 Some applications have no convenient means of allowing a gravity drain In this case a condensate pump can be used These come either factory mounted or shipped loose 3 Factory mounted condensate pumps do not require a separate power source 4 Condensate pumps that ship loose or are field provided typically require a dedicated 110 volt power source 5 Field pipe connections must be made to the pump...

Страница 29: ...ir plenum 2 The suction line of the pump needs to be lower than the drain line of the unit L1 Minimum 1 25 4 mm L2 Fan static pressure x 1 5 3 Bracket Data Aire P N 550 021 006 to be mounted to the unit and stainless steel tank Data Aire P N 550 721 464 are factory provided 4 Hose hose clamps self drilling sheet metal screws 10 x 3 4 fittings P trap and copper tubing are field provided ...

Страница 30: ...nsion valves etc If the ambient temperature surrounding the piping system increases this may cause the contained refrigerant pressure to increase to an unacceptable level WARNING This increased pressure can cause piping ruptures discharge of refrigerant pollution equipment damage injury or death USE EXTREME CAUTION WHEN Installing the piping lines and make certain that these isolation devices are ...

Страница 31: ... drop of peripheral components Shutoff valves field provided should be installed within a few feet of the inlet and outlet connections of the evaporator to allow the unit to be isolated for service Drain fill valves field provided should be located at the lowest point on the connected piping Water glycol cooled units are shipped with plate fin heat exchangers as standard equipment A strainer Data ...

Страница 32: ...is a required component of a proper system installation The tank can be provided by Data Aire or by others 2 All Water Glycol field piping must be designed and installed in accordance with ASHRAE standards and local codes 3 Centrifugal pumps and component are optional Flow switch required with dual pumps otherwise optional ...

Страница 33: ...or WARNING With any fluid connection there is risk of leakage Water leakage could result in property damage to mission critical equipment A water drain connection is required Units with optional steam generator humidifiers will require an external potable water supply Water leakage can result from improper installation and or practices Electrical Installation The field power and control wiring sho...

Страница 34: ...rtment Contact Data Aire Service Department for details The commissioning includes pre startup inspections of installed components subsystems and systems and the execution of the verification and functional performance testing and related system controls The commissioning field work is conducted in accordance with the project specific verification and functional performance test plan This test pla...

Страница 35: ...ensed and qualified electrician Risk of electrical shock could result in injury or death Disconnect all remote electrical facility power prior to working on the unit All wiring must conform to local and national electrical code requirements Seal openings around piping and electrical connection to prevent air leakage Failure to do so could reduce the unit s cooling performance NOTICE A single Disco...

Страница 36: ...igh voltage wiring Upon arrival of the unit inspect all wiring and electrical components for damage either visible or concealed before installation Use correctly sized copper wire only and verify that all electrical connections are tight before turning power ON Check all electrical connections periodically and tighten as necessary All field supplied signal cable if applicable shall have the follow...

Страница 37: ...cuit breaker or fuse size required to protect the system Max Fuse or Max CKT BKR indicates the maximum breaker or fuse size and this information is used to size the appropriate fuses or a Heating Air Conditioning and Refrigeration HACR type circuit breaker Other protection devices are not allowed based upon the product UL listing The facility main distribution panel which provides electrical servi...

Страница 38: ... indoor evaporator to the electrical control box of the remote heat exchanger require heavier gauge wire and a special Parts order for a low holding current relay is required Consult Data Aire Parts department for detailed information In this case the installing contractor must follow the applicable electrical codes to determine the required wire gauge Condensing units i e where the compressor is ...

Страница 39: ...ove the jumper clip prior to installing the field wires Mini dap4 Controller The Data Aire Computer Room Air Conditioner CRAC or Computer Room Air Handler CRAH is furnished with a microprocessor based Mini dap4 controller The controller includes unit control functions and display normal functions and service diagnostics with six keys buttons for easy programming The controller allows recall and di...

Страница 40: ...e Condensate Pumps The optional condensate pumps which ships loose normally require a separate source of 110 volt power Always check the pump power requirements before connecting power Condensate pumps are available in other voltages Condensate pumps may also come unit mounted and wired in the unit as a factory option While no outside power source is required field piping is still a requirement Di...

Страница 41: ...al Simply slide the manual switches to energize the fan compressor s humidification reheat and other functions as applicable Some DAP may have a special Electronically Commutated EC plug fan motor and the fan speed can be adjusted from 0 to 10 volts DC by adjusting the potentiometer at the left of the Fan Speed switch The fan speed will increase 10 of the fan base speed for each one 1 volt adjustm...

Страница 42: ...ring diagram in the evaporator will indicate field interface terminals to the secondary heat exchanger The internal wiring of the secondary heat exchanger is found on a separate diagram which can be found on the inside cover of the heat exchanger electrical box Both diagram types are also placed inside the shipping warranty packet secured in the evaporator section INSTALLATION OF REMOTE OUTDOOR HE...

Страница 43: ...or R 410A pressure High pressure recovery machine suitable for R 410A pressure High pressure recovery tank suitable for R 410A pressure Ref DOT 4BA400 or ABW400 Triple Evacuation and Dehydration Procedure Data Aire highly recommends a triple evacuation to be carried out on all Data Aire units to ensure the highest quality moisture removal Moisture prevents the proper operation of both the compress...

Страница 44: ...al tool Two Stage Vacuum Pump s NOTICE Two pumps will speed up the procedure One 1 vacuum pump located normally outside at the condenser and one 1 vacuum pump is located indoors at the evaporator unit The vacuum pump should be connected to the discharge line after the check valve and the liquid line before the metering device via vacuum rated hoses and Schrader valve core removal tools On the high...

Страница 45: ... the nitrogen bottle regulator to the manifold gauges vacuum port and carefully break the vacuum with clean dry nitrogen Slowly raise the pressure to approximately 5 PSIG 35 kPa without contaminating the system 6 Isolate and hold the nitrogen charge for at least 10 minutes 7 Verify that there are no nitrogen leaks 8 Carefully release the nitrogen charge Watching the gauge until it reads 1 PSIG 7 k...

Страница 46: ... before the unit is put back on the pump for dehydration 8 After the system has been satisfactorily evacuated the evacuation equipment can be removed and the system can be charged with refrigerant 9 Make sure all service and field installed ball valve are open and remain open for charging 10 Ensure all valve cores and caps are reinstalled on the Schrader port and on the Rotolock service valves WAR...

Страница 47: ... offset the cooling load Suction pressure should be equal to 33 F 0 56 C saturated temperature or greater See further instructions for the following options Section 5 8 2 Air Cooled Split System Charging Section 5 8 5 Flooded System Charging Systems with Low Ambient Receiver Package Section 5 8 13 Water Glycol Cooled System Charging Voltage Phase Check Evaporator Power Phase Check Prior to fully c...

Страница 48: ...ns and Maintenance Manual for additional information regarding this type of heat exchanger DARC Heat Exchangers Phase Check See the DARC Air Cooled Condensers Installation Operations and Maintenance Manual for proper phase check procedures Line Set Charge Calculations 1 Since most of the refrigerant weight is in liquid form in the liquid line refrigerant in the hot gas line and suction line is ign...

Страница 49: ...8 0 407 20 33 40 65 60 98 81 31 Component Functional Test Critical components can be functionally verified by using the manual mode of the Mini dap4 See Mini dap4 User Manual for details regarding how to use Menu I Manual Control Service Level Charging Procedures WARNING If the system is charged from a vacuum the preheating of the compressor is not necessary But if starting a compressor that has n...

Страница 50: ...osphere per the latest edition of ASHRAE Standard 15 and or any local building fire or mechanical codes This applies to all units with either shell and tube condensers or high pressure relief valve options Air Cooled Split System Charging Air cooled condensers provided with Data Aire equipment have integral fan speed controls The fan speed control is programmed at the factory to start the fan at a...

Страница 51: ...DAPA Starting Charge R 407C Weight of Refrigerant in Evaporator and Condenser Evaporator Model Condenser Model Starting Charge lbs DAPA 2 5XX GHRC 011XX or DARC 03XX GHRC 018XX or DARC 05XX Option GHRC 025XX or DARC 07XX Option 6 2 8 2 8 8 DAPA 03XX GHRC 011XX or DARC 03XX GHRC 018XX or DARC 05XX Option GHRC 025XX or DARC 07XX Option GHRC 039XX or DARC 11XX Option 6 2 8 2 8 8 8 5 DAPA 04XX GHRC 01...

Страница 52: ...ual for details During manual control all automatic control is disabled but the system safety switches will remain functional Charging the Fixed Speed Compressor Charging requires the unit the unit operation Before turning the system ON to finish charging the circuit 1 and 2 make sure to check for voltage phasing For more information on this refer to section 5 5 Voltage Phase Check WARNING When wo...

Страница 53: ...the correct refrigerant charge Other parameters such as superheat suction pressure head pressure subcooling and ambient temperature are also important factors A system charged to a clear sight glass is often overcharged Adjust the refrigerant charge to the subcooling value shown in the table below and the sight glass has sparse bubbles The unit should be allowed to stabilize for 15 to 20 minutes t...

Страница 54: ...er Package NOTICE Prior to refrigerant charging the proper tools and or equipment must be available and the system vacuum and moisture removal procedure must have been carried out Refer to Section 5 2 Charging Installation Work Procedures and 5 3 Triple Evacuation and Dehydration Procedure prior to charging the system NOTICE Improper charging procedure could cause compressor damage in several ways...

Страница 55: ... warmer weather The receiver should be sized so it is at 80 to 82 of capacity while containing the entire system charge Another aspect of receivers is that they contain both liquid and gaseous refrigerant at the same time By their design receivers prohibit liquid subcooling from occurring Without liquid subcooling the capacity of the system is reduced and care must be taken in the design of the li...

Страница 56: ...dition in the receiver See section 2 27 Refrigerant Piping Protection for additional information regarding piping and receiver over pressure protection Receiver Installation Be sure the receiver capacity is large enough to store the winter charge during summer operations and is generally designed so that receiver can hold at least the same volume as the condenser coil The receiver package s is typ...

Страница 57: ...he charging line to the refrigerant tank and set for liquid feed Open the refrigerant tank valve and purge the line Use a liquid charging adapter to break the vacuum with 90 PSIG 621 kPa of liquid refrigerant so liquid refrigerant doesn t enter the compressor through the open compressor suction and discharge Rotolock service valves Before starting the system charge the receiver with liquid refrige...

Страница 58: ...re to increase Once you reach the pressure value shown below enable the condenser fans and continue to charge each circuit until it reaches the value shown Table 18 Discharge Head Pressure Refrigerant Head Pressure R 410A 380 PSIG 2620 kPa or higher R 407C 230 PSIG 1586 kPa or higher While charging during the summer meter refrigerant through the suction line until the level of liquid in the receiv...

Страница 59: ... Receivers Acceptable parameters range for water glycol packaged units with receivers with return air temperature of 65 F 18 3 C to 85 F 29 4 C and entering water glycol temp of 65 F 18 3 C to 85 F 29 4 C Refrigerant Liquid Line Pressure PSIG kPa Liquid Line Temp F C Suction Pressure PSIG kPa Suction Sat Temp F C Subcooling Temp F C Superheat Temp F C R 410A 290 to 390 1999 to 2689 85 to 100 29 4 ...

Страница 60: ...e adjusting stem clockwise to increase the superheat NOTICE Make no more than one turn of the stem at a time As long as thirty minutes 30 may be required for the system to re stabilize High Pressure Cutout Switch Each refrigerant circuit is protected by a high pressure cutout switch non adjustable with manual reset button The switch is typically located in the evaporator near the compressor The hi...

Страница 61: ...aporator during the OFF cycle The Liquid Line Solenoid Valve LLVS is a direct acting NC normally closed i e closed when deenergized solenoid operated valve The advantage is the valve is closed when the system is not running and when the solenoid valve is not energized For this reason an electrical power failure does not lead to any problems with the refrigeration system ...

Страница 62: ...tion Operation and Maintenance Manuals which should be referred to for more complete details regarding remote heat exchangers Brazed Plate Condensers Data Aire water cooled units use brazed plate condensers as a standard Brazed plate condensers are constructed of plates brazed together to form an assembly of separate channels Refrigerant is confined to the space between the welded plates and is ex...

Страница 63: ...ld be kept smaller than 0 8 mm and is recommended to fit a 40 to 70 mesh strainer Regular maintenance of this unit is required to ensure continued performance 6 2 3 3 Dissolved products Under certain circumstance crystallized deposits of calcium and magnesium ion in the water will attach to the condenser surface and scale The higher the concentration of Ca2 and Mg and the water temperature the gre...

Страница 64: ...d to prevent corrosion of system components Consult glycol manufacturer for testing and maintenance of inhibitors Commercial ethylene glycol when pure is generally less corrosive to the common metals of construction than water itself It will however assume the corrosivity of the water from which it is prepared and may become increasingly corrosive with use if not properly inhibited Fluid Cooler In...

Страница 65: ... is extremely undesirable in a closed loop system CAUTION Risk of using the wrong type of glycol can cause piping damage coolant fluid leaks and catastrophic and expensive building and equipment damage Do not use automotive antifreeze as it contains chemicals that can damage the piping system Typical inhibited formula ethylene glycol and propylene glycol are supplied with corrosion inhibitors and ...

Страница 66: ...l the Mini dap4 controller settings are established Optional Expanded dap4 Microprocessor Controller The Expanded dap4 microprocessor controller is available as an upgrade from the Mini dap4 and offers additional features and additional analog inputs outputs There is a separate manual with extensive detail regarding the functions features programming and troubleshooting NOTICE The Expanded dap4 mi...

Страница 67: ...r filter pressure differential pressure switch for proper adjustment temporarily cover approximately 75 of the return air opening using heavy cardboard or similar material The alarm should energize when 75 of the air is blocked simulating dirty filters If the alarm energizes prematurely or does not energize at all the pressure switch should be adjusted All side panels must remain closed when deter...

Страница 68: ...rgized the burning debris can create smoke or an unpleasant odor To help avoid a problem periodic cleaning is recommended Humidifier If the unit is provided with an optional self contained microprocessor controlled steam generator type humidifier The steam generating humidifier uses a disposable cylinder with electronic controls The humidifier discharges pure steam with no material dust carryover ...

Страница 69: ... input line power i e 208 230V 3PH 60HZ or 460V 3PH 60HZ Do not carry out any work on electrically live parts Even after disconnection the de link circuit is still live Always wait at least 3 minutes EC motors have built in protective features that include the following Over Temperature protection of the motor electronics Over Temperature protection of the motor Locked rotor protection Phase failu...

Страница 70: ...ed dap4 has a time delay before the No Airflow alarm is energized It is adjustable from 5 to 180 seconds in 5 second increments On site where a voltage problem is known to exist the delay can be adjusted to eliminate nuisance alarms until the problem is corrected EC Motor Testing To test the plenum fan modules in manual mode wire a 9 volt battery across the plug fan control signal see schematic fo...

Страница 71: ...ck operation sequence Check calibration of change over thermostat Energy Saver system only Controls Type Mini dap4 Expanded dap4 Thermostat Check unit control operation Check operation of the following High water alarm Pressure differential switch Fan current sensing switch Blower Section Blower wheel free of debris moves freely Check belt tension and condition Bearings in good condition Check she...

Страница 72: ...s secure Check capillary lines Condensate Pan and Pump if equipped Check for leaks Check for debris Inspect check float operation Check pump operation Condensers Water Cooled Check for water glycol leaks in the piping area Water regulating valve function Entering leaving water temperatures Entering T F Leaving T F Compressor Monthly Check for oil leaks Check compressor mounting Inspect wire connec...

Страница 73: ...Inspect fan blade s Check wiring Inspect piping for leaks Glycol Pump Monthly if applicable Glycol leaks pump area Pump operation Auto air vent clean of mineral deposits Glycol Pump Quarterly if applicable Record pump pressures 1 Suction PSIG Discharge PSIG Record pump current draw L1 A L2 A L3 A Equipment Runtimes Blower Compressor 1 Compressor 2 Condenser Reheat 1 if equipped Reheat 2 if equippe...

Страница 74: ... device This is to help determine the maximum protective device Question 4 What is the input voltage tolerance Answer In general it is 10 but refer to Electrical Section for more details Question 5 Will all units operate at 50 or 60 hertz power Answer No This depends on the model and options selected Consult with Data Aire for details Question 6 Does the unit require an electrical ground Answer Ye...

Страница 75: ...cated on the unit serial name plate label Question 15 What is the SCCR rating for the unit Answer SCCR is short circuit current rating Unless specified the SCCR rating is 10 kA root mean square symmetrical 600 volts maximum Mechanical FAQ Section Question 1 What piping sizes should be used to connect split air cooled Data Aire units Answer The best way to get this information is to review the Inst...

Страница 76: ...humidifiers can be adjusted within the range minimum to 100 Factory setting is 60 of capacity Question 5 Is an air vent valve required in the piping when an expansion tank is used Answer Yes air vents must be installed in various locations in the piping system to purge air and are required at the highest point in the piping system One of the most common problems in water glycol systems is the pres...

Страница 77: ... strainer 12 Low pressure drop across the valve a Same as 11 above b Undersized distributor nozzle or circuits c Low condensing temperature 1 Oversized TXV 2 TXV seat leak 3 Low superheat adjustment 4 TXV Bulb installation a Poor thermal contact b Warm location 5 Wrong thermostatic charge 6 Bad compressor low capacity 7 Moisture dirt wax 8 Incorrectly located external equalizer Low Suction Pressur...

Страница 78: ...rvice dataaire com Engineering dataaire com Sales dataaire com Fax 714 921 6010 Main 714 921 6011 Engineering 714 921 6022 Parts Sales Web Site www dataaire com Job Unit Information Data Aire Job Number Evaporator Model Number Evaporator Serial Number Condenser Model Number Condenser Serial Number Date Installed Installing Contractor ...

Страница 79: ...ded system 55 57 Fluid cooler 62 Frequently Asked Questions FAQ 74 Full Load Amps FLA 74 Fuse 37 G Glycol system 37 Glycol Systems 62 Grounding 37 H Head pressure 53 Heat 13 33 38 39 47 48 66 Heat Exchanger 31 37 63 Heat Transfer 63 Humidifier 30 68 72 73 I Inspection 8 Installation 2 8 9 11 12 15 16 17 25 27 30 31 33 34 36 37 42 43 48 49 54 56 62 75 Installing Mounting 15 L Liquid line 20 77 Loca...

Страница 80: ...4 75 Remote Sensor 40 Rigging 14 S Shutoff valve 31 Sight glass 53 Spare air filters 67 Special Service Equipment 43 Storage 9 Subcooling 53 59 Superheat 53 59 77 T Thermal Expansion Valve TXV 43 46 60 77 Trap 27 28 Triple Evacuation 43 V Voltage 37 38 47 52 74 W Water regulating valve 72 Water glycol cooled 31 Wiring 12 36 38 42 66 Wiring diagrams 38 ...

Страница 81: ...DAP IOM_10 2022 ...

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