Table of Contents
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Installation, Operation
WARNING
QUALIFIED INSTALLER
Improper
installation,
alteration, service or maintenance
can
cause
property
personal injury or loss of life. Startup
and service must be performed by a
Factory Trained Service Technician.
A copy of this IOM should be kept
with the unit.
Condensing Units
& Maintenance
adjustment,
damage,
CB SERIES
WARNING
FOR YOUR SAFETY
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WARNING
If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury or loss of life.
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Table of Contents
Related Manuals for AAON CB-024
Summary of Contents for AAON CB-024
- Page 1 CB SERIES Condensing Units Installation, Operation & Maintenance WARNING WARNING QUALIFIED INSTALLER FOR YOUR SAFETY Improper installation, adjustment, Do not store or use gasoline or other alteration, service or maintenance flammable vapors and liquids in the cause property damage, vicinity of this or any other appliance. personal injury or loss of life.
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Page 2: Table Of Contents
Table of Contents ® AAON CB Series Features and Options Introduction ..............5 Safety .............................. 6 CB Base Model and Features Description ..................10 General Description ........................11 Codes and Ordinances ......................11 Receiving Unit .......................... 11 Storage ............................12 Direct Expansion (DX) Condensing Units ................ - Page 3 Compressor Lockouts ....................... 36 Maintenance ..........................37 Coils ............................37 E-Coated Coil Cleaning ......................37 DX Cooling ..........................39 Condenser Fan Motor ....................... 39 Replacement Parts ........................39 Warranty, Service, and Parts Department ................. 39 Refrigerant Piping Diagrams ......................40 CB Series Startup Form ........................
- Page 4 Index of Tables and Figures Tables: Table 1 - Recommended Elevation Minimums ................15 Table 2 - Predetermined Line sizes for CB units with two step compressors and R-410A ..25 Table 3 - Acceptable Refrigeration Circuit Values ............... 28 Table 4 - Performance Testing Air Flow Setpoints ..............
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Page 5: Aaon Cb Series Features And Options Introduction
® AAON CB Series Features and Options Introduction Energy Efficiency System Integration Two Step or Variable Capacity Scroll Split System Matching Compressor Modulating Head Pressure Control Air-Source Heat Pump Single Point Power Variable Speed Condenser Fans for Head ... -
Page 6: Safety
Safety Attention should be paid to the following statements: NOTE - Notes are intended to clarify the unit installation, operation and maintenance. CAUTION - Caution statements are given to prevent actions that may result in equipment damage, property damage, or personal injury. WARNING - Warning statements are given to prevent actions that could result in equipment damage, property damage, personal injury or death. - Page 7 WARNING WARNING GROUNDING REQUIRED FIRE, EXPLOSION OR CARBON MONOXIDE POISONING HAZARD All field installed wiring must be Failure to replace proper controls completed by qualified personnel. Field installed wiring must comply could result in fire, explosion or with NEC/CEC, local state carbon monoxide poisoning.
- Page 8 WARNING CAUTION UNIT HANDLING PVC PIPING PVC (Polyvinyl Chloride) and CPVC To prevent injury or death lifting (Chlorinated Polyvinyl Chloride) are equipment capacity shall exceed unit vulnerable attack certain weight by an adequate safety factor. chemicals. Polyolester (POE) oils Always test-lift unit not more than 24 used with R-410A...
- Page 9 1. Startup and service must be performed CAUTION Factory Trained Service Technician. COIL CLEANING 2. The unit is for outdoor use only. See Do not clean DX refrigerant coils with General Information section for more hot water or steam. The use of hot unit information.
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Page 10: Cb Base Model And Features Description
CB Series Feature String Nomenclature Model Options Unit Feature Options CB - B - 060 - 3 - B - 1 : B D 0 0 D A 0 CB Base Model and Features Descriptio n BASE MODEL FEATURE 2: REFRIGERATION SERIES AND GENERATION OPTIONS 0 = Standard - Split System Air Conditioner... -
Page 11: General Description
General Description WARNING AAON CB Series condensing units have SHARP EDGES been designed for outdoor installation only. Startup and service must be performed by a Coils and sheet metal surfaces Factory Trained Service Technician. present sharp edges and care must... -
Page 12: Storage
The warranty card must be completed in full migration. This means the compressor may and returned to AAON not more than 3 cool down and liquid refrigerant may months after the unit is delivered. accumulate in the compressor. Since the... -
Page 13: Wiring Diagrams
WARNING Note: Multiple Systems with Multiple Thermostats COMPRESSOR CYCLING When several heating and cooling split systems are used to condition a space all 5 MINUTE MINIMUM OFF TIME thermostat switches must be set in either prevent motor overheating heating mode, cooling mode or off. Do not compressors must cycle off for a leave part of the systems switched to the minimum of 5 minutes. -
Page 14: Installation
When the unit is in place, Installation remove the dolly or lifting device. Make sure the unit is properly seated and level. AAON equipment has been designed for quick and easy installation. Locating Unit CB Series condensing units are designed for... -
Page 15: Mounting Isolation
corner of the unit is recommended for locations, it is recommended that the unit be service. elevated to allow unobstructed drainage and airflow. Table 1 - Recommended Elevation Minimums Design Suggest Minimum Temperature Elevation 3” +15 F and above 8” -5... -
Page 16: Electrical
Protect the branch circuit in accordance with Electrical Verify the unit nameplate agrees with the code requirements. The unit must be power supply. Connect power and control electrically grounded in accordance with field wiring as shown on the unit wiring local codes, or in the absence of local codes, diagram provided with the unit. -
Page 17: Thermostat
9825i2 Thermostat motor rotation and check blower motor ® amperage listed on the motor nameplate is Honeywell VisionPRO IAQ Thermostat not exceeded. AAON Mini Controller CAUTION Three phase voltage imbalance will cause motor overheating premature failure. Wire control signals to the unit’s low voltage terminal block located in the controls compartment. -
Page 18: Refrigerant Piping
AAON, Inc. is not responsible for interconnecting refrigerant piping. The piping between the condenser and low – Consult... -
Page 19: Liquid Line Sizing
Equivalent Line Length A moisture-indicating sight glass may be All line lengths discussed in this manual, field installed in the liquid line to indicate unless specifically stated otherwise, are the occurrence of premature flashing or Equivalent Line Lengths. The frictional moisture in the line. -
Page 20: Suction Line Sizing
If the velocity of refrigerant in the liquid line Suction Line Routing is too great, it could cause excessive noise or Pitch the suction line in the direction of flow piping erosion. recommended (about 1 foot per 120 feet of length) to maximum velocities for liquid lines are 100 maintain oil flow towards the compressor, fpm from the condenser to a receiver tank to... -
Page 21: Figure 4 - Heat Pump Piping Schematic Of Suction Vapor Flow Down In Double Riser
A double riser used for heat pump operation works differently than that described above. The specific volume (ft /lb) of refrigerant at the discharge temperature (heating mode line conditions) is significantly lower than specific volume suction temperature (cooling mode line conditions). To compound the issue, the capacity in heating mode is lower than the capacity in cooling mode. -
Page 22: Hot Gas Bypass Line
Hot Gas Reheat Field piping between the condensing unit The AAON modulating hot gas reheat system diverts hot discharge gas from the and the evaporator is required. condenser to the air handling unit through... -
Page 23: Predetermined Line Sizes
Predetermined Line Sizes diameters to ensure that this method is To aid in line sizing and selection, AAON applicable to a particular case. Do not has predetermined line sizes for the liquid, assume that these line sizes are appropriate... - Page 24 When to Use Predetermined Line Sizes section. Do not assume that these line sizes are appropriate for every case. Consult ASHRAE – Handbook Refrigeration generally accepted system piping practices. The AAON Refrigerant Piping Calculator in Ecat32 can be used for job specific line sizing.
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Page 25: Table 2 - Predetermined Line Sizes For Cb Units With Two Step Compressors And R-410A
** Hot Gas Reheat line Figure 6 - Riser height versus total equivalent line length Note: Figure 6 is for R-410A split system applications with two step compressor CB-024 through CB-060 units. The region of acceptable riser height is the lighter area. Select the corresponding predetermined line size from Table 2 above. -
Page 26: Startup
Startup CAUTION (See back of the manual for startup form.) COMPRESSOR ROTATION WARNING Scroll compressors are directional and will be damaged by operation in ELECTRIC SHOCK the wrong direction. Low pressure switches on compressors have been Electric shock hazard. Shut off all disconnected after factory testing. -
Page 27: Charging Refrigerant & Adjusting Refrigerant Charge
Units equipped with hot gas bypass must Charging Refrigerant & Adjusting Refrigerant Charge have the hot gas bypass valve closed to get The unit comes with full charge based on a the proper charge. 25 foot line set. Charging a system in the field must be based on determination of Units equipped with hot gas reheat must be liquid sub-cooling and evaporator superheat. -
Page 28: Checking Evaporator Superheat
Subtract measured liquid line evaporator superheat within temperature from the saturated temperature temperature range as shown in Table 3 (high to determine the liquid sub-cooling. superheat results in increased sub-cooling) Compare calculated sub-cooling to Table 3 Correct an overcharged system by reducing below for the appropriate unit type and the amount of refrigerant in the system to options. -
Page 29: Air Flow
For units equipped with low ambient The unit will have to be checked for proper refrigerant flood back option being charged operation once the ambient temperature is when the ambient temperature is cold: above 80°F. Once enough charge has been added to get the evaporator superheat and sub-cooling values to the correct setting, more charge CAUTION... -
Page 30: Table 5 - R-410A Refrigerant Temperature-Pressure Chart
Table 5 - R-410A Refrigerant Temperature-Pressure Chart °F PSIG °F PSIG °F PSIG °F PSIG °F PSIG 78.3 134.7 213.7 321.0 463.2 80.0 137.2 217.1 325.6 469.3 81.8 139.7 220.6 330.2 475.4 83.6 142.2 224.1 334.9 481.6 85.4 144.8 227.7 339.6 487.8 87.2... -
Page 31: Operation
Compressor Operation The compressors must be off for a minimum of 5 minutes and on for a minimum of 5 Unit operations should be controlled with minutes. Short cycling of the compressors thermostat, or unit controller, never at the can causes undue stress and wear. main power supply, except for emergency, servicing, or complete shutdown of the unit. -
Page 32: Table 6 - Demand Signal Vs. Compressor Capacity Modulation
High Voltage Terminals A1 & A2 Alarm Relay Out M1 & M2 Contactor Control Voltage N Control Voltage L U1 & U2 Digital Unloader Solenoid V1 & V2 Vapor Injection Solenoid WARNING To avoid damaging the compressor Figure 7 - Variable Capacity Compressor controller, DO NOT connect wires to Controller terminals C3, C4, T3, T4, T5, or T6. -
Page 33: Table 7 - Thermistor Temperature Vs. Resistance Values
Figure 8 - Compressor Controller Flash Code Details Table 7 - Thermistor Temperature vs. Resistance Values kΩ kΩ °C °F °C °F 2889.60 12.73 2087.22 10.79 1522.20 9.20 1121.44 7.87 834.72 6.77 627.28 5.85 475.74 5.09 363.99 4.45 280.82 3.87 218.41 3.35 171.17... -
Page 34: Low Ambient Operation
Variable speed condenser fan head pressure control is a low ambient head pressure AAON head pressure control units can control option that sends to an electronically operate down to 35°F ambient temperature. commutated motor a variable signal in... -
Page 35: Lac Valve
The low ambient system maintains normal head pressure during periods of low ambient LAC Valve by restricting liquid flow from the condenser The Low Ambient Control (LAC) valve is a to the receiver, and at the same time non-adjustable three valve that bypassing hot gas around the condenser to... -
Page 36: Condenser Flooding
Condenser Flooding Compressor Lockouts In order to maintain head pressure in the Some units include adjustable compressor refrigeration system, liquid refrigerant is lockouts. The compressor lockout in the kept in the condenser to reduce condenser picture below can be set to any temperature surface. -
Page 37: Maintenance
E-Coated Coil Cleaning Maintenance Documented routine cleaning of e-coated (See back of the manual for maintenance coils is required to maintain coating log.) warranty coverage. At least once each year, a qualified service technician should check out the unit. This WARNING includes reading and recording suction Electric shock hazard. - Page 38 and cleaning, has been approved for use on CAUTION e-coated coils to remove mold, mildew, dust, soot, greasy residue, lint, and other High velocity water from a pressure particulate: washer or compressed air should only be used at a very low pressure Enviro-Coil Concentrate, Part Number H- to prevent fin and/or coil damages.
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Page 39: Dx Cooling
Check Replacement Parts compressor operation, rotation, amperage Parts for AAON equipment may be obtained and voltage to the unit nameplate (check the from your local AAON representative. amperage on the load side of the compressor Reference the unit serial number and part contactor). -
Page 40: Refrigerant Piping Diagrams
Refrigerant Piping Diagrams Figure 12– A/C only piping, AHU above CU... -
Page 41: Figure 13 - A/C Only Piping, Ahu Below Cu
Figure 13 – A/C only piping, AHU below CU... -
Page 42: Figure 14 - Modulating Hot Gas Reheat Piping, Ahu Above Cu
Figure 14 – Modulating hot gas reheat piping, AHU above CU... -
Page 43: Figure 15 - Modulating Hot Gas Reheat Piping, Ahu Below Cu
Figure 15 – Modulating hot gas reheat piping, AHU below CU... -
Page 44: Figure 16 - Hot Gas Bypass Piping, Ahu Above Cu
Figure 16 – Hot gas bypass piping, AHU above CU... -
Page 45: Figure 17 - Hot Gas Bypass Piping, Ahu Below Cu
Figure 17 – Hot gas bypass piping, AHU below CU... -
Page 46: Figure 18 - Modulating Hot Gas Reheat With Hot Gas Bypass Piping, Ahu Above Cu
Figure 18 – Modulating hot gas reheat with hot gas bypass piping, AHU above CU... -
Page 47: Figure 19 - Modulating Hot Gas Reheat With Hot Gas Bypass Piping, Ahu Below Cu
Figure 19 – Modulating hot gas reheat with hot gas bypass piping, AHU below CU... -
Page 48: Figure 20 - Heat Pump Piping, Ahu Above Cu
Figure 20 – Heat pump piping, AHU above CU... -
Page 49: Figure 21 - Heat Pump Piping, Ahu Below Cu
Figure 21 – Heat pump piping, AHU below CU... -
Page 50: Figure 22 - Heat Pump With Modulating Hot Gas Reheat Piping, Ahu Above Cu
Figure 22 – Heat pump with modulating hot gas reheat piping, AHU above CU... -
Page 51: Figure 23 - Heat Pump With Modulating Hot Gas Reheat, Ahu Below Cu
Figure 23 – Heat pump with modulating hot gas reheat, AHU below CU... -
Page 52: Cb Series Startup Form
CB Series Startup Form Date:______________ Job Name:_____________________________________________________________________ Address:______________________________________________________________________ Model Number:_________________________________________________________________ ______________________________________________________________________________ Serial Number:_____________________________________________ Tag:_______________ Startup Contractor:______________________________________________________________ Address:__________________________________________________ Phone:_____________ _________________________________________________________ Pre Startup Checklist Installing contractor should verify the following items. 1. Is there any visible shipping damage? 2. Is the unit level? 3. - Page 53 Refrigeration System 1 - Heating Mode (Heat Pump Only) Saturated Line Pressure Sub-cooling Superheat Temperature Temperature Discharge Suction Liquid Air-Cooled Condenser Fan Alignment_____ Check Rotation_____ Nameplate Amps________ Number...
- Page 54 This log must be kept with the unit. It is the responsibility of the owner and/or maintenance/service contractor to document any service, repair or adjustments. AAON Service and Warranty Departments are available to advise and provide phone help for proper operation and replacement parts.
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Page 55: Literature Change History
Literature Change History November 2009 Update of manual formatting to match with other IOMs and adding variable capacity scroll compressor information. April 2012 Added oil drip note below piping diagrams. Updated the Startup Form. May 2012 Updated the Table of Contents. March 2013 Update of the manual revising Table S1 - Sub-Cooling and Superheat, adding Table S2 - Performance Testing Air Flow Setpoints, adding information about compressor cycling. -
Page 56: (Acp J00187)
R57611 · Rev. A · 161221 (ACP J00187) It is the intent of AAON to provide accurate and current product information. However, in the interest of product improvement, AAON reserves the right to change pricing, specifications, and/or design of its product without notice, obligation, or liability.