Air-Cooled Split Systems Models ACU 075 to to 300 MBH 60 Hz, R-22 Refrigerant

Transcription

1 atalog 1700 Air-ooled Split Systems Models AU 075 to to 300 MBH 60 Hz, R-22 Refrigerant AU 075 to 150 AU 200 to 300

2 Table of ontents Features and Benefits Standard Features Application Data Selection Procedure Performance Data Physical Data Dimensions Wiring Diagrams Guide Specification Document Number: at 1700 (August 2005) Model Nomenclature AU 075 D Air-cooled ondensing Unit Vintage Nominal MBH apacity 075 = = = = = = = 300 Manufactured in an ISO certified facility. McQuay is a registered trademark of McQuay International McQuay International Illustrations and information cover the McQuay International products at the time of publication and we reserve the right to make changes in design and construction at any time without notice. at 1700 (March 2005) 1

3 Features and Benefits Low Speed Direct Drive Fans With Vertical Air Discharge For Quiet Operation Units exceed ASHRAE Standard 90.1 minimum efficiency requirements Powder oated, Galavanized Steel onstruction For Durability and orrosion Resistance orrosion Resistant Gold Fin ondenser oating Efficient, Quiet, Reliable Scroll ompresssors (Dual ompressors/ Refrigerant ircuits on sizes ) Large Face Area, High Efficiency ondenser oils 2 at 1700 (March 2005)

4 Easy Service and Installation Low Maintenance Direct Drive Fans Small Footprint Accommodates Space onstraints Lifting Holes For Easy Rigging (units are skid mounted for easy handling) Knock Outs Provided For Easy Power And ontrol onnections Factory Provided Holes For Optional Spring Vibration Isolation Easy ontrol Box Access Easy ompressor Access Extended Liquid And Suction Lines For Easy onnection Extended High and Low Pressure Schrader onnections at 1700 (March 2005) 3

5 Standard Features Frame And Base A wood skid is provided for easy unloading and handling. The frame and base are made from powder coated, galvanized steel. Spring vibration isolator holes are provided in the base. Small footprint accommodates almost any installation. ondenser Large face area coils with seamless copper tubes mechanically expanded into aluminum fins. Includes Gold Fin electroplated fin coating passes 1,000 hour salt spray test per JIS Z 2371 (scored 9 out of a possible 10) RPM direct drive condenser fans with aluminum blades operate at lower tip speeds and noise levels (see Table 3 - AU 075 to 300 Physical Data for A-scale sound power ratings) 3-phase motors with internal overload protection. Heavy-gauge vinyl-coated fan guards. ompressor opeland ompliant Scroll ompressors are inherently more reliable than reciprocating compressors due to fewer moving parts and better resistance to liquid and debris. Axial and radial compliance allow the compressor to handle reasonable amounts of non-compressible material. Better theoretical efficiency and less noise and vibration than reciprocating compressors. ast iron scrolls with Teflon impregnated bearings help make this the most reliable scroll on the market. All units exceed ASHRAE 90.1 minimum efficiency requirements. ontrols Single point power connection. ontrol transformer allows 24-volt, field control connections. ompressor crank case heaters. ompressor anti-cycle timers. High and low refrigerant pressure unit protective devices. Field-installed Accessories Hot gas bypass valve kit. Note: Unit includes a capped T on each discharge line for field connecting to the hot gas bypass line and a piping knockout on the cabinet to allow easy piping access to the T. Spring isolator kit contains 4 springs that fit into the mounting holes provided in the unit base. 4 at 1700 (March 2005)

6 Application Data Location For Installation of ondensing Units As condensing temperature rises, evaporating temperature rises and cooling capacity drops. In order to achieve maximum cooling capacity, the location selected should fulfill the following requirements: 1. Sufficient clearance must be provided for proper operation, service and maintenance. To avoid short circuiting condenser air, the minimum distance between adjacent AHU units is 40 inches. Do not install a unit above another. 2. Avoid obstructing airflow into or out of the unit. Remove obstacles that block air intake or discharge. OBSTALE BLOKING AIR OUTLET OBSTALE BLOKING AIR INLET AIR DISHARGE SPAE A SERVIE PANEL A B B 3. Must be well ventilated so that the unit can draw and distribute plenty of air, which helps lower the condensing temperature. 4. Must be capable of bearing the weight of the unit and isolating noise and vibration. 5. Should be protected from direct sunlight. If necessary, use an awning for shade. 6. Avoid annoying neighbors with the hot air discharge and operating sound level. 7. Must not be susceptible to dust or oil mist. Dimension Minimum learance A 24 B AUTION If the condensing unit is operated in an atmosphere containing oils (including machine oils), salt (coastal area), sulphide gas (near hot spring, oil refinery plant), such substances can cause failure of the unit. at 1700 (March 2005) 5

7 MAXIMUM ELEVATION HEIGHT MAXIMUM PIPING ELEVATION 65' MAXIMUM ELEVATION HEIGHT MAXIMUM TOTAL PIPING 115' Field Piping For satisfactory operation and performance, note the following for the field piping arrangements of the complete refrigerant cycle: a. Liquid loops or oil traps must be provided according to the position of the outdoor and the indoor units (depending on whether the indoor unit is above or below the outdoor unit). b. Field supplied expansion valve should be provided as close to the indoor unit (evaporator) as possible. c. Field supplied sight glass and filter drier must be assembled and mounted next to the expansion valve. Maximum Pipe Length and Maximum Number of Bends When piping is too long, the required refrigerant quantity increases and both the capacity and reliability decrease. As the number of bends increase, system piping resistance to the refrigerant flow increases, which lowers the cooling capacity and the may cause compressor failure. If the height difference between the evaporator and the condenser is excessive, the cooling capacity drops, the lubricating oil return is diminished and compressor efficiency is adversely affected. Always choose the shortest piping path and follow the recommendations shown in Figure 1 MaximumElevation Maximum Length Maximum Number of Bends AUTION 1.Warranty will be revoked if the height, length and/or the number of bends of the refrigerant piping system installed is beyond the limit above. 2.Bends must be carefully made to avoid crushing the pipe. Use a pipe bender. Figure 1: Maximum Piping Elevation and Total Distance OUTDOOR UNIT INDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT ondenser Below Evaporator ondenser Above Evaporator 6 at 1700 (March 2005)

8 Refrigerant Piping Proper refrigerant piping can make the difference between a reliable system and an inefficient, problematic system. The primary concerns related to piping are refrigerant pressure drop, a solid liquid feed to the expansion valves, continuous oil return and properly sized refrigerant specialties. The recommended source for refrigerant piping techniques and sizing is the ASHRAE 2002 Refrigeration Handbook, chapter 2. Refrigerant specialties, including the expansion valves, filter drier and sight glasses for use with the remote evaporator applications, are supplied and installed by the installing contractor. Field-installed service valves in the liquid line, optional hot gas bypass and suction line are recommended. The remaining components, including pipe, insulation, fittings and Schrader valves, are also provided and piped by the installer. The optional hot gas bypass valve can be provided as a field installed or factory-installed option. A holding charge of R-22 is provided for the unit. The installer must properly evacuate the piping system and provide the operating charge of R-22. Although conflicting piping recommendations can be found in different sources, McQuay offers the following recommendations for these controversial issues. Using double risers for vertical gas risers is generally not required and should be used only as a last resort to maintain the minimum refrigerant flow to carry oil up the vertical risers. Slightly downsizing the vertical riser is a superior option to providing double risers. Slope the refrigerant lines 1 per 10 feet of horizontal run in the direction of refrigerant flow to assist oil return. Resist using hot gas bypass for applications when operation in ambient temperature below 40 degrees is expected. This recommendation helps to maintain adequate condensing pressures and liquid refrigerant at the expansion valve when condenser capacities are at their maximum. Pressure drops in the refrigerant lines should be maintained at or below the ASHRAE recommendations and line lengths should be made as short as possible. Exceeding these recommendations will decrease performance and could impact reliability. Small traps should be provided at the base of each major vertical gas riser to assist in the collection of oil. If vertical risers exceed 25 feet, install a small trap at the midpoint, not to exceed more than 20 foot intervals. Use caution in sizing the liquid line in applications where the evaporator is above the outdoor section. The weight of the liquid refrigerant in the vertical column will decrease the pressure at the top of the riser (approximately 0.5 psi per foot of vertical rise), allowing some of the refrigerant to flash to a gas. Adequate refrigerant subcooling is needed at the outdoor section to prevent large volumes of refrigerant gas at the expansion valve. Extend the piping systems above the highest component in the refrigeration system before dropping down to make the final refrigerant connections to components. This practice will hinder condensed refrigerant draining to the lower component. Sound Isolation The ultra-low sound levels for the AU condensing units is sufficient for most applications. However, there will be applications where sound generation can be an issue. The most effective isolation method is to locate the unit away from sound sensitive areas. Avoid locations beneath windows or between structures where normal operating sounds can be objectionable. Reduce structurally transmitted sound by isolating refrigerant lines, electrical conduit and the unit itself. Use wall sleeves and rubber-isolated piping hangers to reduce transmission of refrigerant flow noise into occupied spaces. Use flexible electrical conduit to isolate sound through electrical conduit. Spring isolators are effective in reducing the low amplitude sound generated by scroll compressors and for unit isolation in sound sensitive areas. Ambient Temperature Maximum design ambient temperature = 115 o F Minimum operating ambient temperature = 50 o F Selection Procedure AU condensing units are selected in conjunction with separate evaporators. The AU ratings are based on saturated suction temperature at the compressor inlet and on ambient air dry-bulb temperature. For a system selection, the AU condensing unit is usually selected first, then the line loss is added to the condensing unit saturated suction temperature to determine the saturated evaporating temperature. This temperature is then used for the selection of the evaporator, whether it is a DX coil or shell and tube heat exchanger. For selection purposes, the suction line is normally based on a pressure equivalent of a two degree Farenheit line loss (equal to about 3 psi pressure drop). The correction for altitude found in Table 1 is applied, if applicable, by dividing the required job capacity by the correction factor to ascertain the necessary unit capacity in the apacity Table. AU performance is found in Table 2 covering the normal range of saturated suction temperatures and ambient air temperatures. apacity curves are also provided in Figures 1 to 7 for easier selection. at 1700 (March 2005) 7

9 Selection example, Inch-Pound units Given: Dual refrigeration circuits are required 200 Mbh job requirement 95 o F ambient temperature 40F saturated suction temperature 2,000 foot altitude 1. orrect for altitude by dividing the required capacity by the correction factor from Table Mbh required / factor = 203 mbh corrected requirement. 2. From Table 2, AU 075 through 300, an AU 200 at the given sea level conditions will produce Mbh with a compressor power input of 17.2 kw and a unit EER of orrect for altitude: apacity: Mbh x = Mbh ompressor Power: 17.2 kw x = 17.4 kw EER: 10.8 EER x 0.986/1.009 = 10.6 EER 4. Interpolation determines that 39.5 o F saturated suction temperature must be maintained to yield 200 MBH. ompressor kw at 39.5 o F suction is 17.1 x = Performance Data Notes: 1. Ratings based on HF-22 and sea level altitude. 2. Interpolation is allowed, extrapolation is not permitted. onsult McQuay for performance outside the catalogued ratings. 3. Unit EER is for entire unit, including compressors and fan motors. 5. An evaporator would be selected at 41.5 o F saturated evaporating temperature if a 2 o F line loss was expected. Application Adjustment Factors Altitude orrection Factors Performance tables are based at sea level. Elevations other than sea level affect the performance of the unit. The decreased air density will reduce condenser capacity consequently reducing the unit's performance Table 1: Altitude orrection Factors Altitude apacity Power Sea Leavel 1,000 1, ft. (610m) ft. (1220m) ft. (1830m) Table 2: AU 075 to 300 Physical Data Ambient Air Temperature Model Suction ompressor Unit ompressor Unit ompressor Unit ompressor Unit BTUH Watts EER BTUH Watts EER BTUH Watts EER BTUH Watts EER D D D D D D D at 1700 (March 2005)

10 Figure 2: AU 075 apacity urve % + = F =? EJO * ' % + F H A I I H 9 = JJI 5 = JK H = 5 K? JE 6 A F A H = JK H A Figure 3: AU 100 apacity urve + = F =? EJO * ' % 5 = JK H = 5 K? JE 6 A F A H = JK H A + F H A I I H 9 = JJI. * '. * * * = JJI '. 9 = JJI. 9 = JJI. 9 = JJI at 1700 (March 2005) 9

11 Figure 4: AU 125 apacity urve + = F =? EJO * ' % ' + F H A I I H 2 M A H 9 = JJI 5 = JK H = 5 K? JE 6 A F A H = JK H A Figure 5: AU 150 apacity urve + = F =? EJO * ' % 5 = JK H = 5 K? JE 6 A F A H = JK H A + F H A I I H 2 M A H 9 = JJI. * '. * * * = JJI '. 9 = JJI. 9 = JJI. 9 = JJI 10 at 1700 (March 2005)

12 Figure 6: AU 200 apacity urve* + = F =? EJO * F H A I I H 2 M A H 9 = JJI 5 = JK H = 5 K? JE 6 A F A H = JK H A *Unit includes two identical refrigerant circuits that provide 50% of the graphed capacity and compressor kw. Figure 7: AU 250 apacity urve* + = F =? EJO * F H A I I H 2 M A H 9 = JJI 5 = JK H = 5 K? JE 6 A F A H = JK H A *Unit includes two identical refrigerant circuits that provide 50% of the graphed capacity and compressor kw.. * '. * * * = JJI '. 9 = JJI. 9 = JJI. 9 = JJI at 1700 (March 2005) 11

13 Figure 8: AU 300 apacity urve* + = F =? EJO * = JK H = 5 K? JE 6 A F A H = JK H A + F H A I I H 2 M A H 9 = JJI *Unit includes two identical refrigerant circuits that provide 50% of the graphed capacity and compressor kw.. * '. * * * = JJI '. 9 = JJI. 9 = JJI. 9 = JJI 12 at 1700 (March 2005)

14 Physical Data Table 3: AU 075 to 300 Model Nominal MBH EER At ARI asing Weight (lb.) Sound Power (dba) Tubes Fins ondenser ompressor Electrical Refrigeration 075D 100D 125D 150D 200D 250D 300D Galvanized steel with powder coat finish /8 grooved copper tube with wall aluminum fin with electro-plated coating Rows FPI Face Area (Sq. Ft.) Fan Direct drive with propeller blades RPM Motor HP [1] 0.5 [1] 0.5 [1] 0.6 [1] 0.6 [2] 0.6 [2] 0.6 [2] 0.6 Fan Dia (in.) opeland Model [1] ZR 72 [1] ZR 94 [1] ZR 125 [1] ZR144 [2] ZR 108 [2] ZR 125 [2] ZR 16 Over Load Protection In line In line In line In line In line In line Module Voltage ompressor RLA each amps ompressor LRA each Fan Motor FLA each Unit Ampacity Unit Maximum Fuse Size Unit Recommended Fuse Size Voltage ompressor RLA each amps ompressor LRA each Fan Motor FLA each Unit Ampacity Unit Maximum Fuse Size Unit Recommended Fuse Size ond. Unit harge (lb. R-22) x 11 2 x 14 2 x 17 Suction onnection (in.) 1 1-1/8 1-3/8 1-3/8 2 x 1-1/8 2 x 1-3/8 2 x 1-3/8 Liquid onnection (in.) 1/2 5/8 5/8 5/8 2 x 5/8 2 x 5/8 2 x 5/8 Hot gas onnection (in.) 1-1/4 1-1/4 1-1/4 1-1/4 2 x 1-1/4 2 x 1-1/4 2 x 1-1/4 Notes for Electrical Data Single-and Multi-Pointî Power: 1. Unit wire size ampacity (MA) is equal to 125% of the largest compressor-motor RLA plus 100% of RLA of all other loads in the circuit. 2. The control transformer is furnished and no separate 115V or 24V power is required. 3. Recommended Fuse Sizes are selected at approximately 150% to 175% of the largest compressor RLA, plus 100% of all other loads in the circuit. 4. Must be electrically grounded according to national and local electrical codes. Voltage Limitations: Within 10 percent of nameplate rating. Notes for ompressor and ondenser Fan Amp Draw : 1. ompressor RLA values are for wiring sizing purposes only but do not reflect normal operating current draw at rated capacity. Notes for Field Wiring Data 1. Requires a single disconnect to supply electrical power to the unit. This power supply requires short circuit protection in accordance with local codes. 2. All field wiring to unit power block must be THW type copper wire. at 1700 (March 2005) 13

15 Dimensions Figure 9: AU 075D to 150D Dimensions (all dimensions in inches) Diameter Mounting Holes W W 3.7 Liquid Lifting Brackets Suction Power Entry A 22.9 H Dimension Model Size (inches) 075D-100D 125D 150D H W A Liquid, suction and hot gas connection sizes are found in Table 3 - AU 075 to AU 300 Physical Data. Hot gas bypass connections are inside the cabinet. A 2 knock out is provided. 14 at 1700 (March 2005)

16 Figure 10: AU 200D to 300D Dimensions (all dimensions in inches) Diameter Mounting Holes Power Entry 3.1 Liquid A H Suction Spring Isolator Dimension Model Size (inches) 200D-250D 300D H A Liquid, suction and hot gas connection sizes are found in Table 3 - AU 075 to AU 300 Physical Data. Hot gas bypass connections are inside the cabinet. A pair of 2 knock outs are provided. at 1700 (March 2005) 15

17 Wiring Diagrams Figure 11: AU 075D to 150D Typical Wiring Diagram FIELD POWER SUPPLY{ FIELD SUPPLY B T2 H T1 T3 M GRN-YEL EQUP GRN RED L1 WHITE L2 OFM L3 TRANSFORMER FIELD SUPPLY 24 RED 3.15 AMP FUSE RED R Y THERMOSTAT SWITH BYPASS TIMER 2 LOGI 3 T1 N/OPEN 1 LPS HPS DELAY TIMER LOGI N/LOSED T2 T3 W G IF TH IF LEGEND 1) M - OMPRESSOR MOTOR 2) - ONTATOR OMPRESSOR 3) OMF - OUTDOOR FAN MOTOR 4) LPS - LOW PRESSURE SWITH 5) HPS - HIGH PRESSURE SWITH 6) H - RANKASE HEATER 7) TB - TERMINAL BLOK 8) - ONNETOR BUD 9) GND GROUND 10) IF - INOOR FAN ONNETOR 11) TH - THERMOSTAT 12) B - IRUIT BREAKER 13) FIELD ONTROL WIRE NOTE FOR 24V ONTROL 16 at 1700 (March 2005)

18 Figure 12: AU 200D to 250D Typical Wiring Diagram TRANSFORMER AMP FUSE RED BYPASS TIMER 2 2 LOGI 3 N/OPEN DELAY TIMER 2 T1 LOGI T3 N/LOSED T2 RED WHITE H 1 2 TB1 FIELD SUPPLY B T1 M1 L1 T2 L2 FIELD POWER SUPPLY{ T3 L3 GRN-YEL EQUP GRN L1 OFM2 RED WHITE L2 L3 RED IF T2 L2 DELAY TIMER 1 T1 LOGI T3 N/LOSED BYPASS TIMER 1 2 LOGI 3 N/OPEN H T1 M2 ORANGE ORANGE 1 T2 1 T3 LPS2 ORANGE HPS2 L1 OFM2 ORANGE LPS1 HPS1 L3 R Y1 Y2 W1 W2 G FIELD SUPPLY THERMOSTAT SWITH IF TH1 TH2 LEGEND 1) M - OMPRESSOR MOTOR 2) - ONTATOR OMPRESSOR 3) OMF - OUTDOOR FAN MOTOR 4) LPS - LOW PRESSURE SWITH 5) HPS - HIGH PRESSURE SWITH 6) H - RANKASE HEATER 7) TB - TERMINAL BLOK 8) - ONNETOR BUD 9) GND GROUND 10) IF - INOOR FAN ONNETOR 11) TH - THERMOSTAT 12) B - IRUIT BREAKER 13) FIELD ONTROL WIRE NOTE FOR 24V ONTROL at 1700 (March 2005) 17

19 Figure 13: AU 300D Typical Wiring Diagram TRANSFORMER AMP FUSE RED DELAY TIMER 2 T1 LOGI T3 N/LOSED T2 RED WHITE H 1 2 TB1 FIELD SUPPLY B T1 M1 L1 T2 L2 FIELD POWER SUPPLY{ T3 L3 GRN-YEL EQUP GRN L1 OFM2 RED WHITE L2 L3 RED BYPASS TIMER 2 2 LOGI 3 N/OPEN OTP 2 DELAY TIMER 1 T1 LOGI T3 N/LOSED BYPASS TIMER 1 2 LOGI 3 N/OPEN IF T2 L2 H T1 M2 T3 L1 OFM2 ORANGE ORANGE 1 T2 1 LPS2 ORANGE HPS2 L3 OTP 1 R ORANGE LPS1 HPS1 Y1 Y2 W1 W2 G FIELD SUPPLY THERMOSTAT SWITH IF TH1 TH2 LEGEND 1) M - OMPRESSOR MOTOR 2) - ONTATOR OMPRESSOR 3) OMF - OUTDOOR FAN MOTOR 4) LPS - LOW PRESSURE SWITH 5) HPS - HIGH PRESSURE SWITH 6) OTP - OMPRESSOR OVER TEMPERATURE PROTETION 7) H - RANKASE HEATER 8) TB - TERMINAL BLOK 9) - ONNETOR BUD 10) GND GROUND 11) IF - INOOR FAN ONNETOR 12) TH - THERMOSTAT 13) B - IRUIT BREAKER 14) FIELD ONTROL WIRE NOTE FOR 24V ONTROL 18 at 1700 (March 2005)

20 Guide Specification SETION 15XXX AIR-OOLED SROLL OMPRESSOR ONDENSING UNITS AU 070D-AU 300D PART 1 - GENERAL 1.01 SUMMARY Section includes design, performance criteria, refrigerants, controls, and installation requirements for air-cooled scroll compressor condensing units REFERENES omply with applicable Standards/odes of ARI , ANSI/ASHRAE 15, ETL, cetl, NE, and OSHA as adopted by the State. Units shall meet the efficiency standards of ASHRAE Standard 90.1, October Manufacturer's plant must be ISO Registered SUBMITTALS A. Submit shop drawings and product data in accordance with the specifications. B. Submittals shall include the following: 1) Dimensioned plan and elevation view drawings, required clearances, and location of all field connections. 2) Summary of all auxiliary utility requirements, such as electricity, water, compressed air, etc. Summary shall indicate quality and quantity of each required utility. 3) Schematic diagram of control system indicating points for field interface/connection. 4) Diagram shall fully delineate field and factory wiring. 5) Installation manuals DELIVERY AND HANDLING A. ondensing units shall be delivered to the job site assembled and charged with a holding charge of refrigerant and full oil charge by the manufacturer. B. omply with the manufacturer's instructions for rigging and handling equipment WARRANTY The refrigeration equipment manufacturer s warranty shall be for a period of one year from date of equipment start-up, but not more than 18 months from shipment. The warranty shall provide for repair or replacement of parts only due to failure by material and workmanship that prove defective within the above period, excluding refrigerant. [An additional 4-year parts warranty shall be provided on the compressor only.] PART 2--PRODUTS 2.02 UNIT DESRIPTION Provide and install as shown on the plans factoryassembled, air-cooled scroll compressor condensing units in the size and quantity specified. Each unit shall consist of hermetic scroll compressor sets, air-cooled condenser section, unit protective controls and all components necessary for controlled unit operation when field piped and wired to a separate evaporator, liquid line components and 2-stage, 24-volt thermostat specified elsewhere. [Four ship loose spring isolators shall be provided for field installation to isolate the unit.] 2.03 DESIGN REQUIREMENTS A. Performance: Refer to the schedule of performance on the drawings. B. Performance shall be in accordance with ARI Standard Acoustics: A-scale sound power levels for the unit shall not exceed the following specified levels. The manufacturer shall provide the necessary sound treatment to meet these levels if required. Sound data shall be provided with the quotation. AHU Model DBA ONDENSING UNIT OMPONENTS A. ompressors: The compressors shall be sealed hermetic scroll type with crankcase oil heater and suction strainer. ompressor shall have a forcedfeed lubrication system with a reversible oil pump and oil charge. The compressor motor shall be refrigerant gas cooled, high torque, hermetic induction type, two-pole, with inherent thermal protection on all three phases and shall be mounted on RIS vibration isolator pads. at 1700 (March 2005) 19

21 B. ondenser: The condenser coils shall consist of 3/8 inch (10mm) seamless copper tubes mechanically bonded into aluminum plate-type fins. The fins shall have full drawn collars to completely cover the tubes and be provided with 1.8 g/m2 of electroplated coating for corrosion resistance. The fin coating shall pass a 1,000 hour salt spray test with minimum corrosion, scoring 9 out of 10 when tested in accordance with JIS Z The electroplating shall experience less than 1% reduction in coating weight when exposed to 176F Trichroethylene for five minutes. A subcooling coil shall be an integral part of the main condenser coil. ondenser fans shall be propeller type arranged for vertical air discharge and individually driven by direct-drive fan motors. They shall be equipped with a heavygauge fan guard. TEAO three-phase, direct-drive condenser fans and motors shall be provided with a maximum RPM of Refrigerant ircuit: External suction and liquid line capped connections shall be provided for field connection of refrigerant piping. External Schrader refrigerant gage fittings shall also be provided on the unit exterior such that high and low refrigerant pressures are easily measured. Refrigerant specialties shall be field supplied and installed. [A hot gas bypass valve shall be shipped loose for each refrigerant circuit for field installation.] Each condensing unit discharge line shall include a capped ìtî to facilitate installation. D. ontrol System: A centrally located weatherproof control panel shall contain the field power connection points and control interlock terminals. Power and starting components shall include factory short circuit protection of the control circuit, individual contactors for each fan motor and compressor combination, solid-state compressor three-phase motor overload protection and inherent fan motor overload protection and unit power connections for connection to remote disconnect switch. PART 3 - EXEUTION 3.01 INSTALLATION A. Install in strict accordance with manufacturer s requirements, shop drawings, and contract documents. B. Adjust and level unit in alignment on supports.. oordinate electrical installation with electrical contractor. D. oordinate controls with control contractor. E. Provide all appurtenances required for a fully operational and functional unit START-UP A. Install proper charge of refrigerant and oil. B. Provide testing and starting of machine, and instruct the Owner in its proper operation and maintenance. 20 at 1700 (March 2005)

22 This document contains the most current product information as of this printing. For the most up-to-date product information, please go to McQuay International (800) (08/05)