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- Installation, Service And User Manual
AAON CL SERIES Installation, Service And User Manual
Summary of CL SERIES
Page 1
Cl series rooftop condensing units installation, service & owner’s information manual.
Page 2: Table of Contents
2 table of contents section page general description………………………………………………………………………………………………… unpacking………………………………………………………………………………………………………….. 04 04 owner’s information………………………………………………………………………...................................... Wiring diagrams…………………………………………………………………….............................
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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 © 2007 aaon, inc., all r...
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4 general description all aaon 'cl series' condensers are factory assembled, wired, and charged with 15 lbs. Of refrigerant per system. Models are available for air-cooled and evaporative-cooled applications. Unpacking: when received, the unit should be checked for damage that might have occurred in...
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5 owner's information cont. General maintenance: when the initial startup is made and on a periodic schedule during operation, it is necessary to perform routine service checks on the performance of the condenser. This includes reading and recording suction pressures and checking for normal sub-cool...
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6 installation cont. Low, there will be insufficient pressure to operate the expansion valve properly. During low ambient temperatures, it is difficult to start a system because the refrigerant will migrate to the cold part of the system (condenser) and make it difficult for refrigerant to flow. • t...
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7 installation cont. Oroa valve: this system uses a nonadjustable head pressure control valve that performs the function of limiting the flow of liquid refrigerant from the condenser and at the same time regulates the flow of the hot gas around the condenser to the receiver. The valve setpoint is 18...
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8 installation cont. Piping schematic of example system using the ori/ord valve. The pressure setting of the ori valve determines how well the system will operate. The proper setting is a function of the specific system in which is installed. Generally, the setting should be equivalent to a condensi...
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9 installation cont. 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. The receiver must be s...
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10 diagram of evaporative-cooled condenser section including field water connections and base cutout tap.
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11 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 unit. 2. Verify that any remote stop/start device is requesting the condenser to start. While performing ...
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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. • using diagrams in step 5, determine if the pin was in the hub (hub) or r...
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13 startup cont. Step 3. Determine blade rotation – on the concave side of the blade is a blade marking showing 6wr, 6wl, 7wl, 7wr, or 9wr. The “l” and “r” denote the rotation of the blade. Step 4. Replace the pitch insert in the blade root with an insert of the desired pitch. Step 5. Replace blades...
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14 servicing and maintenance cont. Charging refrigerant: • charging a system in the field must be based on determination of liquid sub-cooling and evaporator superheat. On a system with a thermostatic expansion valve liquid sub-cooling is more representative of the charge than evaporator superheat b...
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15 servicing and maintenance cont. Adjusting sub-cooling and superheat temperatures: the system is overcharged if: 1. The sub-cooling temperature is too high and 2. The evaporator is fully loaded (low loads on the evaporator result in increased sub-cooling) and 3. The evaporator superheat is within ...
Page 16: Aaon, Inc.
16 aaon, inc. Www.Aaon.Com customer service department 2425 south yukon ave • tulsa, ok 74107 phone: 918-583-2266 • fax: 918-382-6364 always use aaon specified parts to order parts from the aaon parts store online go to www.Aaonparts.Com. Evaporative-cooled condenser • evaporative cooling equipment ...
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17 evaporative-cooled condenser cont. Performance: improper location of the evaporative-cooled condenser may seriously degrade the capacity of the equipment. Make sure the equipment is located such that discharge air from the condenser does not enter the condenser air inlet. Warranties: please refer...
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18 evaporative-cooled condenser cont. 4. Turn rotating element by hand to assure that it rotates freely. Running: periodically inspect pump while running, but especially after initial start-up and after repairs. 1. Check pump and piping for leaks. Repair immediately. 2. Record pressure gauge reading...
Page 19
19 evaporative-cooled condenser cont. Water treatment system: • all aaon evaporative-cooled condensers come equipped with a water treatment system that should be maintained by a local water treatment professional trained in the water treatment of evaporative condensers. This system consists of a con...
Page 20
20 evaporative-cooled condenser cont. Maintenance recommendations pump maintenance: • cleaning - remove oil, dust, water, and chemicals from exterior of motor and pump. Keep motor air inlet and outlet open. Blow out interior of open motors with clean compressed air at low pressure. • labeled motors-...
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21 evaporative-cooled condenser cont. Water quality recirculating water quality guidelines: • cycles of concentration (the ratio of dissolved solids in recirculated water to dissolved solids in make-up), should be determined and monitored frequently by a competent water treatment expert. • to limit ...
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22 refrigerant piping cont. • excessive suction line pressure drop causes loss of compressor capacity and increased power usage resulting in reduced system efficiency. Excessive pressure drops in the liquid line can cause the liquid refrigerant to flash, resulting in faulty expansion valve operation...
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23 refrigerant piping cont. • if the velocity of refrigerant in the liquid line is too great, it could cause excessive noise or piping erosion. The recommended maximum velocities for liquid lines are 100 fpm from the condenser to a receiver tank to discourage fluid backup, and 300 fpm from receiver ...
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24 refrigerant piping cont. Hot gas bypass line: • hot gas bypass is available for use with dx systems that may experience low suction pressure during the operating cycle. This may be due to varying load conditions associated with vav applications or units supplying a large percentage of outside air...
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25 refrigerant piping cont. (ashrae handbook 2006 - refrigeration p. 2.19). Hot gas bypass pipe diameters are selected to maintain velocity below a maximum 4000 fpm, while a minimum criteria guarantees oil return up vertical rise sections, as with the suction line (ashrae handbook 2006 – refrigerati...
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26 refrigerant piping cont. Table rp-1 predetermined line sizes for dual circuit cl units with r-410a r-410a connection size predetermined line size tons system suction line liquid line hot gas bypass reheat suction line liquid line hot gas bypass reheat 1 45 2 1-3/8 in. 7/8 in. 7/8 in. 7/8 in. 1-5/...
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27 refrigerant piping cont. Table rp-2 predetermined line sizes for dual circuit cl units with r-22 r-22 connection size predetermined line size tons system suction line liquid line hot gas bypass reheat suction line liquid line hot gas bypass reheat 1 45 2 1-3/8 in. 5/8 in. 7/8 in. 7/8 in. 2-1/8 in...
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28 refrigerant piping cont. Table rp-3 predetermined line sizes for single circuit cl units with r-410a r-410a connection size predetermined line size tons system suction line liquid line hot gas bypass reheat suction line liquid line hot gas bypass reheat 1 2 3 45 4 1-1/8 in. 5/8 in. 7/8 in. 7/8 in...
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29 refrigerant piping cont. 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 ...
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30 refrigerant piping cont. 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-...
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31 figure rp-5. Hot gas bypass piping diagram with air handler above condenser. Note: components shown within air handler and condensing unit are factory installed; all other components are field installed..
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32 figure rp-6. Hot gas bypass piping diagram with air handler below condenser. Note: components shown within air handler and condensing unit are factory installed; all other components are field installed..
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33 figure rp-7. Reheat/hot gas bypass piping diagram with air handler above condenser. Note: components shown within air handler and condensing unit are factory installed; all other components are field installed..
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34 figure rp-8. Reheat/hot gas bypass piping diagram with air handler below condenser. Note: components shown within air handler and condensing unit are factory installed; all other components are field installed..
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35 figure rp-9. Reheat/hot gas bypass piping diagram with air handler evaporator above condenser and field installed suction line accumulator. Note: components shown within air handler and condensing unit are factory installed; all other components are field installed..
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36 figure rp-10. Reheat/hot gas bypass piping diagram with air handler below condenser and field installed suction line accumulator. Note: components shown within air handler and condensing unit are factory installed; all other components are field installed..
Page 37: Cl Startup Form
37 cl startup form page 1 of 2 date:___________________ job name:_________________________________________________________________________________________ address:_________________________________________________________________ model no:______________ city, state:___________________________________...
Page 38: Cl Startup Form
38 cl startup form page 2 of 2 refrigeration system #1 saturated line pressure temperature temperature sub-cooling superheat discharge suction liquid refrigeration system #2 saturated line pressure temperature temperature sub-cooling superheat discharge suction liquid refrigeration system #3 saturat...
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39 notes:.
Page 40: Cl Series Condensing
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.