AAON CL SERIES Installation, Service And User Manual
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AAON CL SERIES Installation, Service And User Manual

Rooftop condensing units
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CL SERIES
ROOFTOP CONDENSING UNITS
INSTALLATION, SERVICE
&
OWNER'S INFORMATION MANUAL

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Summary of Contents for AAON CL SERIES

  • Page 1 CL SERIES ROOFTOP CONDENSING UNITS INSTALLATION, SERVICE & OWNER’S INFORMATION MANUAL...

  • Page 2: Table Of Contents

    EVAPORATIVE-COOLED CONDENSER SECTION……………………………………………………………………... General Information………………………………………………………………………………………………… Pre Start-Up………………………………………………………………………………………………………… Maintenance Recommendations……………………………………………………………………………………. Water Quality……………………………………………………………………………………………………….. AIR-COOLED CONDENSER SECTION…………………………………………………………………………………... REFRIGERANT PIPING FOR CL SERIES…………………………..………………………………….………..……..Equivalent Line Length…………………………………………………………………………………….………. Liquid Line Sizing…………………………………………………………………...……………………………... Suction Line Sizing……………………………………………………………………………………..…………... Hot Gas Bypass Line Sizing..………………………………………………………………….………….………... Predetermined Line Sizes…………………………………………………………………………………………... TABLE RP-1 Predetermined Line sizes for Dual Circuit CL units with R-410A……………………….………….
  • Page 3 It is the intent of AAON, Inc. to provide accurate and current specification information. However, in the interest of product improvement, AAON, Inc. reserves the right to change pricing, specifications, and/or design of its products without notice, obligation or liability ©...

  • Page 4: General Description

    GENERAL DESCRIPTION power is restored. • Before unit operation, the main power switch All AAON 'CL Series' condensers are factory must be turned on for at least twenty four hours assembled, wired, and charged with 15 lbs. of for units with compressor crankcase heaters. This refrigerant per system.

  • Page 5: General Maintenance

    Access Doors: Condenser Placement: • A lockable access door is provided to the • The AAON condenser is designed for outdoor compressor and electrical compartment. applications and mounting at ground level or on • A light switch is on the wall of the compressor a rooftop.

  • Page 6: Lac Valve

    LAC Valve: difficult for refrigerant to flow. The LAC valve is a non-adjustable three way • The AAON low ambient system maintains valve that modulates to maintain receiver normal head pressure during periods of low pressure. As the receiver pressure drops below...

  • Page 7: Oroa Valve

    condenser and at the same time regulates the INSTALLATION cont. flow of the hot gas around the condenser to the receiver. The valve setpoint is 180 psig. This OROA Valve: valve is called an OROA valve (Open on Rise of Outlet pressure).

  • Page 8: Condenser Flooding

    INSTALLATION cont. Piping Schematic of Example system using the ORI/ORD valve. The pressure setting of the ORI valve determines Condenser Flooding: how well the system will operate. The proper In order to maintain head pressure in the setting is a function of the specific system in refrigeration system, liquid refrigerant is backed which is installed.

  • Page 9: Electrical

    • The piping connections are protected with a INSTALLATION cont. shipping cover that must be removed prior to copper connection and installation. During higher ambient temperatures the entire condenser is required to condense refrigerant. During these higher ambient temperatures, a receiver tank is used to contain the refrigerant that was required to flood the condenser during low ambient operation.
  • Page 10 Diagram of Evaporative-cooled condenser Section including field water connections and base cutout tap...

  • Page 11: Startup

    STARTUP Pre-Startup: After the installation and immediately before the startup of the condenser be sure that these items have been checked. 1. Verify that electrical power is available to the Axial Flow Fans: unit. 2. Verify that any remote stop/start device is Multi-Wing Z Series Aluminum Fan Blade requesting the condenser to start.
  • Page 12 STARTUP cont. Step 2. Find Blade Pitch Angle: ( 20, 25, 27.5, 30, 32.5, 35, 37.5, 40, 45 or 50 ) • Carefully disassemble fan on flat surface and note in which groove the pin is located. Refer to groove number code diagram. •...

  • Page 13: Servicing & Maintenance

    STARTUP cont. Compressors: The scroll compressors are fully hermetic and Step 3. Determine blade rotation – on the require no maintenance except keeping the shell concave side of the blade is a blade marking clean. showing 6WR, 6WL, 7WL, 7WR, or 9WR. The “L”...

  • Page 14: Charging Refrigerant

    2. Read the gauge pressure reading of the liquid SERVICING AND MAINTENANCE line close to the point where the temperature was taken. You must use liquid line pressure as it cont. will vary from discharge pressure due to condenser coil pressure drop. Charging Refrigerant: 3.

  • Page 15: Adjusting Sub-Cooling And Superheat Temperatures

    AAON. when the ambient temperature is warm: Once enough charge has been added to get the Replacement parts for AAON equipment may be evaporator superheat and sub-cooling values to obtained from AAON. When ordering parts, the correct setting more charge must be added.

  • Page 16: Evaporative-Cooled Condenser Section

    ALWAYS USE AAON SPECIFIED PARTS contaminants removed from the air by the washing action of the water. Personnel exposed To order parts from the AAON Parts store to the saturated effluent, drift, or direct contact online go to www.aaonparts.com. should use proper precaution. Proper location of...

  • Page 17: Pre Start-Up

    The inlet screens The coil is leak tested at 450 P.S.I.G. before should be inspected for foreign material. shipment. AAON will not be responsible for loss of refrigerant. It is the responsibility of the Pump Operation:...
  • Page 18 Condenser Fan Motors: water gets to the medium water level. In normal • The direct-drive condenser motors on AAON operation, the water level should swing between evaporative-cooled condensers are 1200-rpm the medium and high water levels.
  • Page 19 Water Treatment System: delay relay in order for the pump to establish • All AAON evaporative-cooled condensers recirculating water flow. If flow is not proven come equipped with a water treatment system...

  • Page 20: Maintenance Recommendations

    6. Inspect axial fans and eliminators removing EVAPORATIVE-COOLED any debris which may have accumulated during CONDENSER cont. operation. 7. Inspect the water distribution system to insure MAINTENANCE RECOMMENDATIONS that nozzles and spray orifices are functioning correctly. The inspection should be made with Pump Maintenance: the circulation pump on and fans off.

  • Page 21: Water Quality

    • All AAON CL condensing units have factory furnished liquid and suction line shutoff valves. Mechanical Cleaning: Do not attempt to mechanically clean the copper Determining Refrigerant Line size: tubing in the evaporative-cooled condenser.

  • Page 22: Equivalent Line Length

    only method to ensure that liquid refrigerant REFRIGERANT PIPING cont. reaches the TXV. • Liquid risers decrease head pressure. If the • Excessive suction line pressure drop causes loss evaporator section is below the condenser, and of compressor capacity and increased power the liquid line does not include risers, the usage resulting in reduced system efficiency.

  • Page 23: Suction Line Sizing

    load while not incurring excessive frictional REFRIGERANT PIPING cont. losses at full load. The double suction riser consists of a small diameter riser in parallel with • If the velocity of refrigerant in the liquid line is a larger diameter riser, and a trap at the base of too great, it could cause excessive noise or piping the large riser.

  • Page 24: Predetermined Line Sizes

    Run Predetermined Line Sizes: an oil return line, using 1/8 inch capillary tube, 5 • To aid in line sizing and selection, AAON has feet in length, from the drain leg to the suction predetermined line sizes for comfort cooling line.
  • Page 25 Second, determine the refrigerant being used, system installation. AAON offers CL products with R-410A and R-...

  • Page 26: Table Rp-1 Predetermined Line Sizes For Dual Circuit Cl Units With R-410A

    REFRIGERANT PIPING cont. TABLE RP-1 Predetermined Line sizes for Dual Circuit CL units with R-410A R-410A Tons System Connection Size Predetermined Line Size Suction Line Liquid Line Hot Gas Bypass Reheat Suction Line Liquid Line Hot Gas Bypass Reheat 1-3/8 in. 7/8 in.

  • Page 27: Table Rp-2 Predetermined Line Sizes For Dual Circuit Cl Units With R-22

    REFRIGERANT PIPING cont. TABLE RP-2 Predetermined Line sizes for Dual Circuit CL units with R-22 R-22 Tons System Connection Size Predetermined Line Size Suction Line Liquid Line Hot Gas Bypass Reheat Suction Line Liquid Line Hot Gas Bypass Reheat 1-3/8 in. 5/8 in.

  • Page 28: Table Rp-3 Predetermined Line Sizes For Single Circuit Cl Units With R-410A

    REFRIGERANT PIPING cont. TABLE RP-3 Predetermined Line sizes for Single Circuit CL units with R-410A R-410A Tons System Connection Size Predetermined Line Size Suction Line Liquid Line Hot Gas Bypass Reheat Suction Line Liquid Line Hot Gas Bypass Reheat 1-1/8 in. 5/8 in.
  • Page 29 REFRIGERANT PIPING cont. Acceptable Region FIGURE RP-1. Riser height versus total equivalent line length for R-410A split system applications with dual circuited CL-045 through CL-230 units. The region of acceptable riser height is the lighter area. Select the corresponding predetermined line size from TABLE RP-1 on page 26. Acceptable Region FIGURE RP-2.
  • Page 30 REFRIGERANT PIPING cont. Acceptable Region FIGURE RP-3. Riser height versus total equivalent line length for R-410A split system applications with single circuited CL-045 through CL-230 units. The region of acceptable riser height is the lighter area. Select the corresponding predetermined line size from TABLE RP-3 on page 28. Acceptable Region FIGURE RP-4.

  • Page 31: Hot Gas Bypass Line Routing Diagrams

    Note: Components shown within air handler and condensing unit are factory installed; all other components are field installed. FIGURE RP-5. Hot Gas Bypass Piping Diagram with air handler above condenser.
  • Page 32 Note: Components shown within air handler and condensing unit are factory installed; all other components are field installed. FIGURE RP-6. Hot Gas Bypass Piping Diagram with air handler below condenser.
  • Page 33 Note: Components shown within air handler and condensing unit are factory installed; all other components are field installed. FIGURE RP-7. Reheat/Hot Gas Bypass Piping Diagram with air handler above condenser.
  • Page 34 Note: Components shown within air handler and condensing unit are factory installed; all other components are field installed. FIGURE RP-8. Reheat/Hot Gas Bypass Piping Diagram with air handler below condenser.
  • Page 35 Note: Components shown within air handler and condensing unit are factory installed; all other components are field installed. FIGURE RP-9. Reheat/Hot Gas Bypass Piping Diagram with air handler evaporator above condenser and field installed suction line accumulator.
  • Page 36 Note: Components shown within air handler and condensing unit are factory installed; all other components are field installed. FIGURE RP-10. Reheat/Hot Gas Bypass Piping Diagram with air handler below condenser and field installed suction line accumulator.

  • Page 37: Cl Series Startup Form

    CL STARTUP FORM PAGE 1 of 2 DATE:___________________ JOB NAME:_________________________________________________________________________________________ ADDRESS:_________________________________________________________________ MODEL No:______________ CITY, STATE:______________________________________________________________ SERIAL No:______________ START-UP CONTRACTOR:___________________________________________________ TAG:____________________ PRE START-UP CHECKLIST Installing contractor shall verify the following items (cross out items that do not apply). 1. Is there any visible shipping damage?__________________________________________________ Yes 2.
  • Page 38 CL STARTUP FORM PAGE 2 of 2 REFRIGERATION SYSTEM #1 SATURATED LINE PRESSURE SUB-COOLING SUPERHEAT TEMPERATURE TEMPERATURE DISCHARGE SUCTION LIQUID REFRIGERATION SYSTEM #2 SATURATED LINE PRESSURE SUB-COOLING SUPERHEAT TEMPERATURE TEMPERATURE DISCHARGE SUCTION LIQUID REFRIGERATION SYSTEM #3 SATURATED LINE PRESSURE SUB-COOLING SUPERHEAT TEMPERATURE TEMPERATURE...
  • Page 39 NOTES:...
  • Page 40 CL SERIES CONDENSING UNIT • INSTALLATION, SERVICE & OWNERS INFORMATION MANUAL AAON, Inc. 2425 South Yukon Tulsa, Oklahoma 74107 Phone: (918) 583-2266 • Fax: (918) 583-6094 R10110 · Rev. B · 4-07...

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