Air-Cooled Condensers Model ACH 014 - 225 Model ACX 014 - 225 Model ACL 014 - 225 Capacities from 130 MBH to 2225 MBH R-22, R-134a, R-407C, R-410A

Manufactured in an ISO Certified Facility Document: Issue Date: Revised Replaces: Cat 622 August 2007 March 2013 August 2012 ©2012 Daikin Applied. Illustrations and data cover the Daikin product at the time of publication and we reserve the right to make changes in design and construction at anytime without notice.

Introduction Direct Drive Condenser Series The Daikin direct-drive, air-cooled condensers are available in three different models, each with 24 sizes and numerous options. They are designed to be used with Daikin Model WGS screw compressors (R-134a) or WGZ scroll compressor chillers (R-22). Model ACH, providing low-cost, high capacity performance where sound and efficiency are not major concerns. Models ACL and ACX, providing moderate cost, excellent capacity and efficiency, coupled with low sound levels. Table 1, Model Summary FEATURE Fan Type Cabinet Venturi Cover Hinged Option Sound Level...

Model Description In addition to the features described in the previous section, each model has unique features and components that determine its cost/efficiency/sound-level mix. Model ACL and ACX Two mid-line units offering a combination of excellent efficiency and sound ratings at a moderate price. Fan Motors: 830 rpm fan motors; the ACX having 1.0 HP and the ACL having 1.5 HP. Fan Blades: Both models have patented blade design providing high air flow capacity with low sound levels. The ACL has a slightly more aggressive design, moving more air for greater capacity, but with larger motors and...

Design Features and Benefits Ease of Installation The condensers are designed to reduce the cost and time required for installation. All lifting brackets are factory installed, and the legs are designed for quick installations. Fan motors are factory wired to a control panel providing a single point for field wiring. The control panel has a through-the-door disconnect. A variety of fan cycling control panels can be factory mounted and wired to the condenser, eliminating the need for a field-mounted built-up control panel. Lifting lugs are factory mounted for easy rigging and installation. Dynamic...

Floating Tube All condensers use a Patented Floating Tube Design (U.S. Patent No. 5,158,134) to eliminate refrigerant leaks at the tube sheets. Additional tubes are added to the condenser coil. These tubes are expanded into the aluminum fins and condenser tube sheets. These anchor tubes support the weight of the coil, but are not a part of the refrigerant circuit. The tubes in the refrigerant circuit are expanded into the fins, but “float” through oversized holes in the tube sheets. Tube sheet leaks are virtually eliminated, since the tubes which carry refrigerant never come in contact with the...

Discharge Pressure Control Proper application of controls is important to a successful installation. Daikin air-cooled condensers have several control options available. System Arrangements: The fan control arrangement for WGZ and WGS chillers are shown in Table 2 and Table 3 on page 8. Condenser pressure control is accomplished by varying the total coil airflow by changing the number of operating fans and/or the speed of the “first on, last off” fan. The number of control stages is shown in the tables. The SpeedTrol™ option should be used when unit operation is expected in ambient temperatures...

staging function, or some other multi-step controller or multiple pressure switches can be used. 3. Pressure Switch Control with Control Transformer (Code MH) This option provides direct control of discharge pressure through a series of factorymounted and wired pressure switches (designated as FCP-Fan Cycle Pressure Control-on the wiring diagrams). As the condenser pressure increases, more pressure switches close and start additional condenser fans. Field wiring between the compressorized product and the remote condenser is not required. A control power transformer is included for 115-volt power...

Options Controls (See page 7 for details) Fan Control 1. 2. Standard control (Code NN) is contactors only SpeedTrol (Code ST), variable fan speed on “first on, last off” fan per circuit. Requires field-supplied fan cycling control on balance of fans or connection to chiller’s MicroTech II controller 3. Pressure switch control (Code MH), factory mounted and wired pressure switches to cycle fans. No speed control. No field control wiring required. 4. Pressure switch control plus FanTrol™ (Code VM), factory mounted pressure switches to cycle fans plus SpeedTrol variable speed on “first on, last...

Selection Procedure The capacity for air-cooled condensers is based on Total Heat of Rejection (THR) at the condenser. Total heat of rejection is equal to net refrigeration at the evaporator (compressor capacity) plus the energy input into the refrigerant by the compressor (heat of compression). The heat of compression will vary depending on the compressor manufacturer, type of compressor and the operating conditions of the compressor. Whenever possible, obtain the heat of compression value from the compressor manufacturer for the specific conditions. If not available, the THR can be estimated...

Step 4: Condenser Selection Condenser capacities for ACH condensers are located in Table 7. These capacities are given in MBH/°TD. Convert the THR from step 2 to MBH/°TD by dividing by 1,000 and the Design TD. 465,885 Btuh / 1000 / 25 = 18.6 Select Model ACH 040A S (single fan row) or ACH 040A D (dual row). The ACH 040A S will be lower in cost, the ACH 040A D will have a more compact footprint. Calculate actual TD and condensing temperature: determine the actual TD by dividing the design THR by the condenser capacity. For the ACH 040A S: Actual TD = 465.8 / 21.8 = 21.3 degrees F. Actual condensing...

Performance Data Table 7, Capacity Data for ACH, 1. For 50 Hertz applications, multiply values by 0.92.