Cf series condenser and condensing units installation, operation, & maintenance 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. Warning qualified installer improper installation, adjustment, alteratio...
2 table of contents aaon cf series features and options introduction..................................................................... 5 safety .............................................................................................................................................. 6 cf serie...
3 warranties ................................................................................................................................. 43 replacement parts ..................................................................................................................... 43 aaon - longview...
4 figure 27 - a/c with modulating hot gas reheat and hot gas bypass split system piping, suction down................................................................................................................................ 56 figure 28 - a/c with modulating hot gas reheat and hot gas bypass s...
5 aaon cf series features and options introduction energy efficiency • staged, two-step, 10-100% variable capacity, or tandem r-410a scroll compressors • air-source heat pump • vfd controlled or ecm driven condenser fans humidity control • modulating hot gas reheat safety • phase and brownout protec...
6 electric shock electric shock hazard. Before servicing, shut off all electrical power to the unit, including remote disconnects, to avoid shock hazard or injury from rotating parts. Follow proper lockout-tagout procedures. Warning safety attention should be paid to the following statements: note -...
7 rotating components unit contains fans with moving parts that can cause serious injury. Do not remove grill containing fans until the power to the unit has been disconnected and fan has stopped rotating. Warning live electrical during installation, testing, servicing, and troubleshooting of the eq...
8 leak testing do not use oxygen, acetylene or air in place of refrigerant and dry nitrogen for leak testing. A violent explosion may result causing injury or death. Warning variable frequency drives electric motor over-current protection and overload protection may be a function of the variable fre...
9 enclosed area do not work in an enclosed area where refrigerant or nitrogen gases may be leaking. A sufficient quantity of vapors may be present and cause injury or death. Warning compressor lubricant polyolester (poe) and polyvinylether (pve) oils are two types of lubricants used in hydrofluoroca...
10 1. Startup and service must be performed by a factory trained service technician. 2. The unit is for outdoor use only. See general information section for more information. 3. Every unit has a unique equipment nameplate with electrical, operational, and unit clearance specifications. Always refer...
Cf series feature string nomenclature model options : unit feature options gen m j r e v s iz e s e r ie s m n r e v v l t a1 a2 a3 a4 a5 1 2a 2b 3a 3b 4 5 6a 6b 6c 7 8a 8b 8c 8d 9 10 11 12 13 14 15 cf a - 015 - b - a - 3 - d c 0 0 k : 0 - a 0 - e 0 - c 0 - a n 0 - b - d e 0 0 - 0 0 a 0 e 0 0 0 0 0 ...
Cf series feature string nomenclature model options : unit feature options g en m jr ev s ize s er ies m n r ev v lt a1 a2 a3 a4 a5 1 2a 2b 3a 3b 4 5 6a 6b 6c 7 8a 8b 8c 8d 9 1 0 11 12 13 14 15 cf a - 015 - b - a - 3 - d c 0 0 k : 0 - a 0 - e 0 - c 0 - a n 0 - b - d e 0 0 - 0 0 a 0 e 0 0 0 0 0 0 0 d...
Cf series feature string nomenclature model options : unit feature options g en m jr ev s ize s er ies m n r ev v lt a1 a2 a3 a4 a5 1 2a 2b 3a 3b 4 5 6a 6b 6c 7 8a 8b 8c 8d 9 10 11 12 13 14 15 cf a - 015 - b - a - 3 - d c 0 0 k : 0 - a 0 - e 0 - c 0 - a n 0 - b - d e 0 0 - 0 0 a 0 e 0 0 0 0 0 0 0 d ...
14 general information aaon cf series air-cooled condensers and condensing units have been designed for outdoor use only. They are factory assembled, wired, charged, and run-tested. Codes and ordinances cf series units have been tested and certified, by etl, in accordance with ul safety standard 199...
15 for security. Installers and owners should secure all doors with locks or nuts and bolts to prevent unauthorized access. The warranty card must be completed in full and returned to aaon not more than 3 months after the unit is delivered. Storage if installation will not occur immediately followin...
16 the standard compressors must be on a minimum of 5 minutes and off for a minimum of 5 minutes. The cycle rate must be no more than 6 starts per hour. The variable capacity compressors must be on a minimum of 3 minutes and off for a minimum of 3 minutes. The cycle rate must be no more than 6 start...
17 installation forklifting the unit cf series condensing unit sizes 2-25 & 30 tons can be lifted using a forklift. 2-7 ton units must have forks at least 48” in length. 9-25 & 30 ton units must have forks 72” in length, or the forks must have 72” fork extensions. Standard units can be lifted from a...
18 lifting the unit if cables or chains are used to hoist the unit they must be the same length. Minimum cable length is 99” for cf series 9-70 ton units. Cf series 2-7 ton units do not include factory installed lifting lugs and should be lifted by forklift only. Care should be taken to prevent dama...
19 the placement relative to the building air intakes and other structures must be carefully selected. Airflow to and from the condenser or condensing unit must not be restricted to prevent a decrease in performance and efficiency. The installation position for 9-70 ton units must provide at least 3...
20 system down to 0°f outside air temperature. See detailed information following. Fan cycling low ambient adjustable fan cycling is a low ambient head pressure control option that cycles the condenser fans to maintain refrigerant circuit head pressures at acceptable levels during cooling operation....
21 figure 6 - piping schematic of example system using the lac valve condenser flooding in order to maintain head pressure in the refrigeration system, liquid refrigerant is kept in the condenser coil to reduce condenser coil surface. The following chart shows the percentage that a condenser coil mu...
22 refrigerant piping (see back of the manual for refrigerant piping diagrams.) general piping from the condensing unit to the air handler is the responsibility of the installing contractor. Use only clean type “acr” copper tubing that has been joined with high temperature brazing alloy. The pipe or...
23 equivalent line length all line lengths discussed in this manual, unless specifically stated otherwise, are equivalent line lengths. The frictional pressure drop through valves, fittings, and accessories is determined by establishing the equivalent length of straight pipe of the same diameter. Al...
24 liquid line guidelines in order to ensure liquid at the txv, the sum of frictional losses and pressure loss due to vertical rise must not exceed available sub-cooling. A commonly used guideline to consider is a system design with pressure losses due to friction through the line not to exceed a co...
25 to carry oil up both risers, and it collects in the trap, effectively closing off the larger diameter riser, and diverting refrigerant up the small riser where velocity of the refrigerant is sufficient to maintain oil flow. At full load, the mass flow clears the trap of oil, and refrigerant is ca...
26 the same line must be used for both modes of operation. In a fashion similar to the liquid line, a common guideline to consider is a system design with pressure losses due to friction through the line not to exceed a corresponding 1-2°f change in saturation temperature. For split system piping wi...
27 at full load, the mass flow clears the trap of oil, and refrigerant is carried through both risers. The smaller diameter pipe should be sized to return oil at minimum load, while the larger diameter pipe should be sized so that flow through both pipes provides acceptable pressure drop at full loa...
28 discharge line traps include traps every 12 feet in vertical discharge riser sections. Discharge line insulation although a typical discharge line does not need to be insulated, the suction line does. Since the same line is used for both, the line must be insulated as described in the suction lin...
29 when installing vertical hot gas bypass lines,an oil drip line must be provided at the lowest point in the system. The oil drip line must be vertical, its diameter should be the same as the diameter of the riser, and it should be 1 foot long. Install a sight glass in the oil drip line for observa...
30 electrical the single point electrical power connections are made in the electrical control compartment. Verify the unit nameplate voltage agrees with the power supply. Connect power and control field wiring as shown on the unit specific wiring diagram provided with the unit. Note: units are fact...
31 note: startup technician must check for proper motor rotation and check fan motor amperage listed on the motor nameplate is not exceeded. Motor overload protection may be a function of the variable frequency drive and must not be bypassed. Wire control signals to the unit’s low voltage terminal b...
32 startup (see back of the manual for startup form.) before startup of the condenser or condensing unit, make sure that the following items have been checked. 1. Verify that electrical power is available to the unit. 2. Verify that any remote stop/start device connected to the unit controller is re...
33 variable capacity compressor controller units with variable capacity scroll compressors may include a variable capacity compressor controller. The following is an explanation of the terminals and troubleshooting of the alert flash codes on the controller. For more information on the compressor co...
34 table 4 - demand signal vs. Compressor capacity modulation figure 12 - compressor controller flash code details demand signal (vdc) loaded % unloaded % time loaded time unloaded % compressor capacity 1.00 off off off off 0% 1.44 10% 90% 1.5 sec 13.5 sec 10% 3.00 50% 50% 7.5 sec 7.5 sec 50% 4.20 8...
35 table 5 - thermistor temperature vs. Resistance values °c °f kΩ °c °f kΩ -40 -40 2889.60 75 167 12.73 -35 -31 2087.22 80 176 10.79 -30 -22 1522.20 85 185 9.20 -25 -13 1121.44 90 194 7.87 -20 -4 834.72 95 203 6.77 -15 5 627.28 100 212 5.85 -10 14 475.74 105 221 5.09 -5 23 363.99 110 230 4.45 0 32 ...
36 maintenance general qualified technicians must perform routine service checks and maintenance. This includes reading and recording the condensing and suction pressures and checking for normal sub-cooling and superheat. Compressors the scroll compressors are fully hermetic and require no maintenan...
37 proper charge. After charging, unit should be operated in heating mode to check for correct charge. Charge may need to be adjusted for heating mode. If adjustments are made in the heating mode, cooling mode must be rerun to verify proper operation. After adding or removing charge the system must ...
38 checking evaporator superheat measure the temperature of the suction line close to the compressor. Read gauge pressure at the suction line close to the compressor. Convert the pressure obtained to a saturated temperature using the appropriate refrigerant temperature-pressure chart. Subtract the s...
39 special low ambient option charging instructions for units equipped with low ambient control (lac) refrigerant flood back option being charged when the ambient temperature is warm: once enough charge has been added to get the evaporator superheat and sub-cooling values to the correct setting, mor...
40 table 8 - r-410a refrigerant temperature-pressure chart °f psig °f psig °f psig °f psig °f psig 20 78.3 47 134.7 74 213.7 101 321.0 128 463.2 21 80.0 48 137.2 75 217.1 102 325.6 129 469.3 22 81.8 49 139.7 76 220.6 103 330.2 130 475.4 23 83.6 50 142.2 77 224.1 104 334.9 131 481.6 24 85.4 51 144.8 ...
41 interior of open motors with clean compressed air at low pressure. Labeled motors- it is imperative for repair of a motor with underwriters’ laboratories label that original clearances be held; that all plugs, screws, other hardware be fastened securely, and that parts replacements be exact dupli...
42 use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil. This will make cleaning efforts more difficult. Surface loaded fibers must be completely removed prior to using low velocity clean water rinse. A monthly clean water rinse is ...
43 the salts will be soluble and is now only necessary to rinse the salts off. Rinse - it is highly recommended that a hose be used. A pressure washer on a high pressure setting will damage the fins. The water to be used for the rinse is recommended to be of potable quality, though a lesser quality ...
44 split system refrigerant piping diagrams figure 15 - a/c split system piping, suction down.
45 figure 16 - a/c split system piping, suction up.
46 figure 17 - a/c with lac split system piping, suction down.
47 figure 18 - a/c with lac split system piping, suction up.
48 figure 19 - a/c with modulating hot gas reheat split system piping, suction down.
49 figure 20 - a/c with modulating hot gas reheat split system piping, suction up.
50 figure 21 - a/c with modulating hot gas reheat split + lac system piping, suction down.
51 figure 22 - a/c with modulating hot gas reheat split + lac system piping, suction up.
52 figure 23 - a/c with hot gas bypass split system piping, suction down.
53 figure 24 - a/c with hot gas bypass split system piping, suction up.
54 figure 25 - a/c with hot gas bypass + lac split system piping, suction down.
55 figure 26 - a/c with hot gas bypass + lac split system piping, suction up.
56 figure 27 - a/c with modulating hot gas reheat and hot gas bypass split system piping, suction down.
57 figure 28 - a/c with modulating hot gas reheat and hot gas bypass split system piping, suction up.
58 figure 29 - a/c with modulating hot gas reheat and hot gas bypass + lac split system piping, suction down.
59 figure 30 - a/c with modulating hot gas reheat and hot gas bypass + lac split system piping, suction up.
60 figure 31 - heat pump split system piping, suction down.
61 figure 32 - heat pump split system piping, suction up.
62 figure 33 - heat pump with modulating hot gas reheat split system piping, suction down.
63 figure 34 - heat pump with modulating hot gas reheat split system piping, suction up.
64 figure 35 - heat pump with hot gas bypass split system piping, suction down.
65 figure 36 - heat pump with hot gas bypass split system piping, suction up.
66 figure 37 – heat pump with modulating hot gas reheat and hot gas bypass split system piping, suction down.
67 figure 38 – heat pump with modulating hot gas reheat and hot gas bypass split system piping, suction up.
68 cf series startup form job name:_______________________________________________ date:______________ address:______________________________________________________________________ ______________________________________________________________________________ model number:__________________________...
69 compressors/dx cooling check rotation number model # l1 l2 l3 head pressure psig suction pressure psig crankcase heater amps 1 2 3 4 refrigeration system 1 - cooling mode pressure saturated temperature line temperature sub-cooling superheat discharge n/a n/a suction n/a liquid n/a refrigeration s...
70 refrigeration system 1 - heating mode (heat pump only) pressure saturated temperature line temperature sub-cooling superheat discharge n/a n/a suction n/a liquid n/a refrigeration system 2 - heating mode (heat pump only) pressure saturated temperature line temperature sub-cooling superheat discha...
71 maintenance log 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 replacemen...
72 literature change history july 2015 initial version march 2016 clarified forklift instructions and removed wording about curb mounting. June 2016 updated cf series features and options introduction. Added feature 17 shipping options in the feature string nomenclature. Added storage information. A...
73.
74 aaon 203 gum spring rd. Longview, tx 75602-1721 phone: 903-236-4403 fax: 903-236-4463 www.Aaon.Com cf series installation, operation, & maintenance v45040 · rev. A · 180319 (acp j00424) it is the intent of aaon to provide accurate and current product information. However, in the interest of produ...
