Model VDC Direct-Drive Remote Air-Cooled Condensers
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1 Model VDC Direct-Drive Remote Air-Cooled Condensers 33 Models R-22, R-134a, R-404A, R-407C, R-410A, R-507A Nominal Heat Rejection Capacity 175 MBH through 2280 MBH
2 Table of Contents... 1 Mechanical Specifications... 3 Accessories and Options... 4 Coil Connections... 5 Selection Data... 6 Dimensions... 9 VDC Charge Calculation...11 Ratings Application Data Electrical Data Wiring Control Data Temperature Data JOHNSON CONTROLS
3 Mechanical Specifications YORK Air-Cooled Condensers, Models VDC-113D60 through VDC-266C60, are available in 33 standard model sizes for air conditioning and refrigeration applications and may be used with any type of compressor for halocarbon refrigerants. Similar units are available for industrial fluid cooling. Contact Johnson Controls for special applications, and refer to Form EG2 for additional information. Air-cooled condensers operate dry (requiring a minimum of maintenance) and do not require pump and water piping installation. Vertical airflow units are standard design for low silhouette applications. LEGS Made from heavy-gauge galvanized steel with foot pads and mounting holes on the bottom of each leg. COIL Seamless copper tubes are expanded into fullcollar aluminum fins. Fins have a corrugated surface to enhance heat transfer. Fin edges are rippled to work harden and stiffen material for resistance to mechanical damage. Return bends and headers are brazed with highly ductile silver-bearing copper alloy. Coil casings and tubesheets are manufactured from galvanized steel. The tubesheets include aluminum inserts to prevent wear at the juncture of the tubes and tubesheets. Prior to shipment, coils are strength and leak tested at design pressure, dehydrated, evacuated, pressurized with dry air or nitrogen, and sealed for shipment. Coils up to four fan lengths use 3/8 in. OD tubes. Fiveand six-fan length coils use 1/2 in. OD tubes. For R-22, R-134a, R-407C, R-404A, and R-507A condensing, the 1/2 in. OD tube coils have a 420 psig (29 barg) design pressure at 250 F (121 C) for up to a 140 F (60 C) condensing temperature. For R-410A, the 3/8 in. OD tube coils have a 650 psig (44.8 barg) design pressure at 250 F (121 C) for up to a 140 F (60 C) condensing temperature. HEADERS Heavy-wall copper tube headers are designed for low pressure loss and proper refrigerant distribution. Double-wide units feature completely separate headers for each system circuit so there is no danger of refrigerant leakage between circuits. Inlet and outlet connections are provided. Integral subcooling is available for condensers. HOUSING The unit structure is comprised of heavygauge galvanized steel panels coated with baked-on champagne-colored powder paint, which, when subjected to ASTM B hour salt spray testing, yields a minimum ASTM 1654 rating of 6. These panels are assembled with high-tensile strength fasteners. Fan panels have smooth-radius outlet orifices to ensure high energy efficiency and low noise level. FAN GUARDS Heavy-gauge OSHA-accepted fan guard design uses corrosion-resistant, coated-steel wire. FANS High-efficiency, high-strength airfoil-profile blade fans are used for low noise and energy-efficient performance. MOTORS Totally-enclosed air-over motors have integral automatic thermal overload (ATO) protection and are inverter duty ready. They feature ball bearings that are double-sealed and permanently lubricated. The standard motor is 2.0 hp, 3-phase, 60 Hz, 200, 230, 460 or 575 volts. See page 18 MOTOR MOUNTS Heavy-gauge galvanized steel channels are used to mount motors. BASIC FACTORY WIRING (STANDARD) Motors are wired to contactors located in a UL-listed NEMA 4, weather-resistant enclosure, which includes a non-fused disconnect switch, motor fuses, contactors, and an integral 115 volt control transformer. Enclosure ships mounted. BASIC MOTOR CONTROL (STANDARD) -- Basic motor control is less optional fan cycling. JOHNSON CONTROLS 3
4 Accessories and Options SPECIAL COILS While standard aluminum fins are compatible with most environments, when a unit is subjected to an especially corrosive atmosphere, such as coastal air with a high concentration of salt, special fin treatment may be required. The following options are available for these applications. HOLLY GOLD COAT This gold-colored, corrosionresistant, polyester-polymer-coated aluminum fin passes 1000 hours of ASTM B117 salt spray testing. Available only with 3/8 in. OD tube coils. ELECTROFIN COAT ElectroFin Coat is applied to the completed coil, protecting the tubes, fins, headers, and galvanized steel casing with a coating that passes 5000 hours of ASTM B117 salt spray testing. Not included in shipped loose manifold kit. COPPER FINS Copper-finned coils are available for applications where the environment may cause galvanic corrosion of aluminum fins. Available only with 3/8 in. OD tube coils. SEALTITE CONDUIT All fan motor wiring enclosed in sealed conduit. MANIFOLD KIT Ties dual inlet and outlet connections together on double-wide units for a single field connection (shipped loose for field installation). Typically used with a single chiller circuit or fluid coolers. MOTOR CONTROL OPTIONS FAN CYCLING Fan Cycling Options have motors wired to contactors located in a UL-listed NEMA 4, weatherresistant enclosure, which includes a non-fused disconnect switch, motor fuses, contactors, and an integral 115 volt control transformer. See Tables 10 and 11, page 25, for fan-cycling control settings or contact Application Engineering for support. Enclosure ships mounted. If there is a concern about noise due to fan cycling, It is recommended that HEAD PRESSURE CONTROL (VFD READY) be used. DOUBLE-WIDE-UNIT FAN CYCLING Fan Cycling Options for Double-Wide Units are available with fans cycling in pairs or, for temperature-controlled and pressurecontrolled fan cycling, with individual fan-bank fan cycling so the VDC circuit can serve individual chiller circuits. FAN CYCLING OPTIONS HEAD PRESSURE CONTROL BY TEMPERATURE Motors are wired for temperature-controlled fan cycling. A temperature sensor, supplied with a clip for mounting in the condenser s air stream or a bulb well for installation in fluid cooler s leaving fluid piping, must be field installed. Fans next to the header are always running when unit is activated by run signal. Receivers are not required. The A350 controller and stage module are supplied with this option to control the fans. HEAD PRESSURE CONTROL BY PRESSURE Required when selecting a VDC for use as a remote condenser for a YCRL chiller. Motors are wired for pressure-controlled fan cycling. Included pressure transducer(s) must be field installed. Fans next to the header are always running when unit is activated by run signal. Receivers are not required. The P470 controller and stage module are supplied with this option to control the fans. HEAD PRESSURE CONTROL BY (MICROPRO- CESSOR-READY RELAY OUTPUT BOARD) Motors are wired for microprocessor relay output board-controlled fan cycling. The microprocessor controller is not included and must be field provided. It is recommended that fans next to the header are always running when unit is activated by run signal. HEAD PRESSURE CONTROL (VFD READY) Motors are wired for variable speed fan control. Does not include VFD drive. VFD bypass control circuit is included. Temperature or pressure sensor(s) for control must be field provided and installed, if desired. 4 JOHNSON CONTROLS
5 Coil Connections FIGURE 1 REFRIGERANT CONNECTIONS Notes: 1. Two standard YORK single-wide condensers with single-circuit coils, one condenser used with each compressor. 2. One standard YORK double-wide condenser with one dual-circuit coil, one circuit used with each compressor. Available with individual fan-bank fan cycling. 3. Two standard YORK double-wide condensers with dual-circuit coils, one condenser used with each compressor, shown with optional manifolds (shipped loose). JOHNSON CONTROLS 5
6 Selection Data YORK remote air-cooled condensers are rated by Total Heat of Rejection (THR) at the condenser (expressed in Btu/h), at sea level air density. Total Heat of Rejection is the sum of the net refrigeration at the evaporator (compressor capacity) plus the energy input into the refrigerant by the compressor (heat of compression). Due to variations in the heat of compression by compressor type and manufacturer, it is recommended that the heat of compression value is obtained from the compressor manufacturer. However, if this is not available the Total Heat of Rejection can be estimated by applying correction factors and information in the tables below to the evaporator load to determine the THR requirement. Please refer to the examples on the following page for the estimation procedure. The two formulas that will be used are: Two-stage open compressor applications: Two-stage suction-cooled hermetic compressor applications: THR = compressor capacity (BTUH) + (2545 x bhp) THR = compressor capacity (BTUH) + (3413 x kw) HEAT OF COMPRESSION FACTORS TABLE 1 OPEN COMPRESSORS EVAP TEMP ( F) CONDENSING TEMPERATURE ( F) * Outside normal limits for single stage compressor applications. TABLE 2 SUCTION-COOLED COMPRESSORS EVAP TEMP ( F) CONDENSING TEMPERATURE ( F) * Outside normal limits for single stage compressor applications. TABLE 3 AIR DENSITY CORRECTION FACTORS AIR TEMP ( F) Notes: SEA LEVEL ELEVATION (FT) , As a guide to selection of the TD (temperature difference between condensing temperature and ambient temperature), the following are suggested: Air conditioning. 25 F TD High & medium temperature refrigeration.20 F TD Low temperature refrigeration 15 F TD Refrigerant R-410A shall only be used with a 3/8 in. O.D. coil, Tube Diameter code = D. 6 JOHNSON CONTROLS
7 TABLE 4 SUBCOOLING CORRECTION FACTORS 10 F SUBCOOLING 15 F SUBCOOLING Factor 0.94 Factor 0.88 Condenser Selection: Example Suction-cooled compressor capacity ,000 Btu/h Evaporator or suction temperature.. 40 F Refrigerant..R-410A Condensing temperature desired F Ambient air design temperature..95 F Temperature difference (TD)...25 F Subcooling...10 F Elevation ft Solution: Step 1. Estimate Condenser THR (if THR is provided, skip to step 2) THR = Compressor Capacity * Heat of Compression Factor 1. From Table 2, opposite 40 F evaporator temperature and under 120 F condensing, select heat of compression factor Multiply compressor or evaporator capacity by factor: THR = 250,000 Btuh x 1.27 = 317,500 Btuh. Step 2. Correct THR for Elevation and Ambient Temperature THR (corrected to sea level) = THR Air Density Correction Factor 1. From Table 3, under 3000 ft. elevation and opposite (interpolated) 95 F air temp, select air density correction factor Divide THR (from step 1) by factor: THR (corrected) = 317,500 Btuh = 370,911 Btuh (at sea level). Step 3. Correct for Subcooling THR (subcooling adjusted) = THR Subcooling Correction Factor 1. From table 4, select 0.94 factor under 10 F Subcooling column. 2. Divide THR (from step 2) by factor: THR (subcooling adjusted) = 370,911 Btuh 0.94 = 394,586 Btuh (adjusted for sea level and subcooling). Step 4. Select Condenser Condenser ratings are provided as Btuh- F TD, so required THR must be divided by TD to obtain basic unit rating at 1 F TD. 1. Divide required unit capacity by TD (25 F) to obtain basic unit rating at 1 F TD: 394,586 Btuh 25 F = 15,783 Btuh- F TD. 2. From Unit Ratings table under R-410A heat rejection, select model VDC-126D60 with a base capacity of 16,793 Btuh- F TD. Step 5. Calculate actual operating TD for unit selected Actual operating TD = THR (corrected) divided by basic unit capacity. 1. To determine TD at which unit will operate, divide THR (corrected) by base unit capacity: 394,586 Btuh 16,793 Btuh- F TD: TD = 23.5 F TD. JOHNSON CONTROLS 7
8 Selection Data - continued AIR-COOLED CONDENSERS FOR CHILLER APPLICATIONS YORK air-cooled condensers are available with matched liquid chillers for air conditioning or process applications. The following table lists scroll chillers cooling chilled water from 54 F to 44 F, using R-410A and condensing at 125 F saturated discharge temperature (SDT). They have been matched with an air-cooled condenser providing 10 F subcooled R-410A refrigerant to the chiller and operating under a 25 F TD (temperature difference between ambient and condensing temperatures). These ratings therefore represent a design ambient temperature of 100 F. TABLE 5 CONDENSER/CHILLER SELECTION TABLE YCRL MODEL CHILLER HEAT OF REJECTION (MBH) SYSTEM A MBH SYSTEM B MBH VDC A MODEL VDC A THR, (BTU/H- DEGF) 10 F SUBCOOLING@ 25 F TD ADJUSTMENT FACTOR VDC A THR, MBH VDC B MODEL VDC B HR, (BTU/H- DEGF) VDC B THR, MBH 0064HE D D HE D D HE D D HE D D HE D D HE D D HE D D Note: Some YCRL models may be matched to a single VDC condenser with the Head Pressure Control by Pressure, Individual Fan Bank Cycling. Heat rejection requirement of largest YCRL circuit must be less than one half the VDC heat rejection capacity. Contact Application Engineering for support. 8 JOHNSON CONTROLS
9 Dimensions SHIPS ON SIDE LEGS SHIP LOOSE TABLE 6 - UNIT DIMENSIONS Model Dimensions No. L W H (1) A B C D E G VDC-11 D VDC-12 D VDC-13 D VDC-14 D VDC-15 C VDC-16 C VDC-22 D VDC-23 D VDC-24 D VDC-25 C VDC-26 C (1) Add 5 to the height on VDC-156, -166, -256, and Note: Dimensions are for reference only. JOHNSON CONTROLS 9
10 Dimensions - continued TABLE 7 COPPER FIN WEIGHT ADDS COPPER FIN COIL UNIT WEIGHT ADDS COILS UNIT SIZES NO. OF ROWS FINS PER INCH WEIGHT PER FAN (LB) 3/8 in. OD Tube Single-Wide: 1 to 4 Fans Double-Wide: 4, 6, & 8 Fans Copper Fin Weight Adjustment Example: Step 1. Find unit weight of a standard aluminum fin VDC-126D60 from Table 8, 944 lb. Step 2. Find copper fin Weight per Fan adder from Table 7 for six rows, 10 fins per inch, 157 lb. Step 3. Multiply the Weight per Fan by the number of fans, 157 x 2 = 314 lb. Step 4. Add the copper weight adder to the unit weight, = 1258 lb. 10 JOHNSON CONTROLS
11 VDC Charge Calculation The following is an example of how to determine the operating charge and pumbdown storage capacity for the VDC condensers. EXAMPLE BASIS Model VDC-244D60 Refrigerant circuits one Internal condenser coil volume shown below 4.9 cu ft OPERATING CHARGE Total operating charge = coil vol (cu ft) x rfr density (lb/cu ft) x 0.24 Total operating charge (R-22) = 4.9 x 70.3 x 0.24 = 83 lbs Total operating charge (R-134a) = 4.9 x 71.4 x 0.24 = 84 lbs Total operating charge (R-404A) = 4.9 x 60.0 x 0.24 = 71 lbs Total operating charge (R-407C) = 4.9 x 66.5 x 0.24 = 78 lbs Total operating charge (R-410A) = 4.9 x 60.7 x 0.24 = 71 lbs Total operating charge (R-507A) = 4.9 x 60.1 x 0.24 = 71 lbs PUMPDOWN STORAGE CAPACITY Total pumpdown capacity = coil vol (cu ft) x rfr density (lb/cu ft) x 0.8 Total pumpdown capacity (R-22) = 4.9 x 70.3 x 0.8 = 276 lbs Total pumpdown capacity (R-134a) = 4.9 x 71.4 x 0.8 = 280 lbs Total pumpdown capacity (R-404A) = 4.9 x 60.0 x 0.8 = 235 lbs Total pumpdown capacity (R-407C) = 4.9 x 66.5 x 0.8 = 261 lbs Total pumpdown capacity (R-410A) = 4.9 x 60.7 x 0.8 = 238 lbs Total pumpdown capacity (R-507A) = 4.9 x 60.1 x 0.8 = 236 lbs Note: Refrigerant temperature for this example is 105 F. Use the density of the refrigerant at the most appropriate temperature for the application. JOHNSON CONTROLS 11
12 Ratings TABLE 8 RATINGS HP FAN 1140 RPM HEAT REJECTION (BTU/H- F TD) (1) MODEL R-22 R-134A R-404A & R-507A R-407C R-410A AIRFLOW (SCFM) SOUND POWER (2) (DBA) COIL (3) INT VOL (CU FT) TOTAL SURFACE (SQ FT) CONN SIZES IN & OUT OD (IN.) APPROX UNIT WEIGHT (LBS) VDC-113D60 6,149 5,842 6,026 5,227 6,211 10, (1) 1 3/8 470 VDC-114D60 7,207 6,847 7,063 6,126 7,279 10, (1) 1 3/8 489 VDC-116D60 8,152 7,744 7,989 6,929 8,233 9, ,482 (1) 1 3/8 528 VDC-123D60 12,566 11,938 12,315 10,681 12,692 21, ,482 (1) 1 5/8 828 VDC-124D60 14,542 13,815 14,251 12,361 14,687 20, ,976 (1) 1 5/8 866 VDC-126D60 16,627 15,796 16,294 14,133 16,793 18, ,964 (1) 1 5/8 944 VDC-133D60 18,659 17,726 18,286 15,860 18,846 31, ,223 (1) 1 5/8 1,189 VDC-134D60 21,366 20,298 20,939 18,161 21,580 30, ,964 (1) 1 5/8 1,246 VDC-136D60 24,821 23,580 24,324 21,098 25,069 28, ,446 (1) 1 5/8 1,363 VDC-143D ,703 42, ,964 (1) 1 5/8 1,546 VDC-144D ,107 40, ,952 (1) 1 5/8 1,621 VDC-146D ,446 37, ,928 (1) 1 5/8 1,777 VDC-143D60 24,459 23,236 23,969 20,790-42, ,964 (1) 2 1/8 1,546 VDC-144D60 28,819 27,378 28,242 24,496-40, ,952 (1) 2 1/8 1,621 VDC-146D60 32,125 30,519 31,483 27,306-37, ,928 (1) 2 1/8 1,777 VDC-153C60 26,599 25,269 26,067 22,609-54, ,551 (1) 2 1/8 2,027 VDC-154C60 31,655 30,072 31,021 26,906-52, ,067 (1) 2 1/8 2,167 VDC-156C60 38,081 36,177 37,320 32,369-49, ,101 (1) 2 1/8 2,529 VDC-163C60 31,517 29,941 30,886 26,789-65, ,461 (1) 2 1/8 2,414 VDC-164C60 37,685 35,801 36,931 32,032-63, ,280 (1) 2 1/8 2,582 VDC-166C60 45,577 43,298 44,665 38,740-59, ,921 (1) 2 1/8 3,015 VDC-223D60 25,132 23,876 24,630 21,362 25,384 42, ,964 (2) 1 5/8 1,405 VDC-224D60 29,084 27,630 28,502 24,721 29,375 40, ,952 (2) 1 5/8 1,481 VDC-226D60 33,254 31,591 32,589 28,266 33,586 37, ,928 (2) 1 5/8 1,636 VDC-233D60 37,318 35,452 36,572 31,720 37,691 63, ,446 (2) 1 5/8 2,034 VDC-234D60 42,732 40,595 41,877 36,322 43,159 60, ,928 (2) 1 5/8 2,147 VDC-236D60 49,642 47,160 48,649 42,195 50,138 56, ,892 (2) 1 5/8 2,380 VDC-243D ,406 84, ,928 (2) 1 5/8 2,653 VDC-244D ,214 81, ,904 (2) 1 5/8 2,804 VDC-246D ,893 75, ,856 (2) 1 5/8 3,115 VDC-243D60 48,917 46,471 47,939 41,580-84, ,928 (2) 2 1/8 2,653 VDC-244D60 57,638 54,756 56,485 48,992-81, ,904 (2) 2 1/8 2,804 VDC-246D60 64,250 61,038 62,965 54,613-75, ,856 (2) 2 1/8 3,115 VDC-253C60 53,198 50,538 52,134 45, , ,101 (2) 2 1/8 3,521 VDC-254C60 63,309 60,144 62,043 53, , ,134 (2) 2 1/8 3,801 VDC-256C60 76,163 72,355 74,639 64,738-98, ,202 (2) 2 1/8 4,500 VDC-263C60 63,034 59,882 61,773 53, , ,922 (2) 2 1/8 4,202 VDC-264C60 75,370 71,602 73,863 64, , ,560 (2) 2 1/8 4,537 VDC-266C60 91,153 86,596 89,330 77, , ,842 (2) 2 1/8 5,374 Notes: 1. Capacity rating factors for integral subcooling are provided in Table 4 for 10 and 15 degrees of subcooling. 2. Sound Power is the spherical sound power level based on fan manufacturer s calculated sound data. 3. Coil internal volume includes header internal volume. 12 JOHNSON CONTROLS
13 TABLE 8 RATINGS CONTINUED HP FAN 1140 RPM MODEL FANS MOTOR CURRENT DRAW AT STANDARD AIR (AMPS) (4)(5)(6)(7)(8)(9) UNIT POWER NOM 200/3/60 230/3/60 460/3/60 575/3/60 QTY INPUT HP FLA MCA MOP FLA MCA MOP FLA MCA MOP FLA MCA MOP (KW) VDC-113D VDC-114D VDC-116D VDC-123D VDC-124D VDC-126D VDC-133D VDC-134D VDC-136D VDC-143D VDC-144D VDC-146D VDC-143D VDC-144D VDC-146D VDC-153C VDC-154C VDC-156C VDC-163C VDC-164C VDC-166C VDC-223D VDC-224D VDC-226D VDC-233D VDC-234D VDC-236D VDC-243D VDC-244D VDC-246D VDC-243D VDC-244D VDC-246D VDC-253C VDC-254C VDC-256C VDC-263C VDC-264C VDC-266C Notes: 4. TEAO motors are VFD ready. 5. Table values for MCA and MOP are for single-fan motor cycling: Temperature-, Pressure- and Microprocessor-Controlled Fan Cycling for singlewide units and Individual Fan Bank Fan Cycling for double-wide units. 6. For Temperature-, Pressure- and Microprocessor-Controled fan cycling for double-wide units (without Individual Fan Bank Fan Cycling) use MCA = 2 x motor FLA x motor FLA x (Fan Qty - 2) + 3 and MOP = 2 x motor FLA x motor FLA x (Fan Qty - 2) + 3 rounded to a standard breaker size with a value equal to or greater than the MCA value. 7. For VFD-Ready for Fan Cycling, use MCA = 1.25 x motor FLA x Fan Qty For units without fan cycling, the Standard Control Option, use MCA = 1.25 x motor FLA x Fan Qty MOP ratings of 15 A and higher are for use with Inverse Time Breaker circuit breakers; values below 15 A are for use with (Nontime-Delay) Fuses. 10. Notes 6, 7 and 8 use single motor FLA not unit total FLA in the formulas for calculating MCA and MOP. JOHNSON CONTROLS 13
14 Application Data Loop Discharge Line Trap Condenser Discharge Line Condenser Compressor Liquid Line Receiver FIGURE 2* Trap Liquid Line PIPING DIAGRAMS The above piping diagram covers a common application where the air-cooled condenser is located on the same elevation as the compressor and receiver. The discharge line in this case is not too critical. The main problem usually associated with this arrangement is insufficient vertical height to allow free draining of the liquid refrigerant from the condenser coil to the receiver. To prevent gas binding in the receiver and liquid build-up in the condenser coil, locate the receiver as far below the condenser outlet as possible. Liquid lines must be free of any loops or traps and horizontal runs must be pitched toward the receiver. Compressor Receiver FIGURE 4* This diagram illustrates a typical piping arrangement where the remote air-cooled condenser is located on a higher elevation than the compressor or receiver. In this arrangement, the design of the discharge line is very critical and should be modified to the arrangement in diagram Fig. 2, unless a very constant and steady load is maintained. Loop Discharge Line A Condenser Discharge Line B Trap Liquid Line FIGURE 5* Compressor Receiver FIGURE 3* This piping diagram is recommended for applications of capacity controlled systems. Discharge line A is sized for the maximum load conditions. Discharge line B is sized for the minimum loading conditions at sufficient velocity to carry the oil to the condenser at the reduced capacity. This diagram illustrates another common application where two or more separate air-cooled condensers are interconnected to a single compressor. In this case, each condenser must have both equal capacity and equal pressure drop. The piping must also be so arranged as to insure equal lengths to and from each condenser. If unlike piping and/or unequal condensers are used, the unequal pressure drop will cause liquid to build up in one of the condensers, reducing its effective capacity. * Note: Receivers are shown in Figures 2 through 5 for convenience. Many applications do not require receivers when the volume of the refrigerant charge does not exceed 80% of the condenser coil internal volume and can be entirely stored in the condenser coil. 14 JOHNSON CONTROLS
15 Electrical Data TABLE 9 LUG DATA VDC MODEL VDC VOLTAGE DISCONNECT WIRE RANGE 200 #14-10 AWG VDC #14-10 AWG 460 #14-10 AWG 575 #14-10 AWG 200 #14-10 AWG VDC #14-10 AWG 460 #14-10 AWG 575 #14-10 AWG 200 #10-3 AWG VDC #10-3 AWG 460 #14-10 AWG 575 #14-10 AWG 200 #10-3 AWG VDC #10-3 AWG 460 #14-10 AWG 575 #14-10 AWG 200 #14-2/0 AWG VDC #14-2/0 AWG 460 #10-3 AWG 575 #14-10 AWG 200 #14-2/0 AWG VDC #14-2/0 AWG 460 #10-3 AWG 575 #10-3 AWG 200 #10-3 AWG VDC #10-3 AWG 460 #14-10 AWG 575 #14-10 AWG 200 #14-2/0 AWG VDC #14-2/0 AWG 460 #10-3 AWG 575 #10-3 AWG 200 #14-2/0 AWG VDC #14-2/0 AWG 460 #10-3 AWG 575 #10-3 AWG 200 #6-3/0 AWG VDC #6-3/0 AWG 460 #14-2/0 AWG 575 #10-3 AWG 200 #6-3/0 AWG VDC #6-3/0 AWG 460 #14-2/0 AWG 575 #10-3 AWG JOHNSON CONTROLS 15
16 Wiring 16 JOHNSON CONTROLS
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18 Wiring - continued 18 JOHNSON CONTROLS
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20 Wiring - continued 20 JOHNSON CONTROLS
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22 Wiring - continued 22 JOHNSON CONTROLS
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24 Control Data VDC PRESSURE SETTING GUIDELINES When a YORK remote condenser type VDC is used with a YCRL chiller, the VDC must be ordered and installed with the Head Pressure Control High Pressure option which provides YORK model P470 pressure controllers factory mounted in the VDC control panel. Operating manuals for the P470 controllers are included in the VDC control panel to allow field setup of the fan staging. Johnson Controls recommends the following pressure set points for general use; if excessive fan cycling is noted the final stage of cycling should be adjusted (deadband increased). The dead band proposed in these guidelines is set to 125 psi, which is the standard setting for JCI air cooled R410 units (YLAA, YCAL). 2 stage units (2 fan single wide, 4 fan double wide VDC): Stage 1, ON when any compressor is ON Stage 2, ON at 380 psig, OFF at 255 psig 3 stage units (3 fan single wide, 6 fan double wide VDC): Stage 1, ON when any compressor is ON Stage 2, ON at 380 psig, OFF at 255psig Stage 3, ON at 405 psig, OFF at 280 psig 4 stage units (4 fan single wide, 8 fan double wide VDC): Stage 1, ON when any compressor is ON Stage 2, ON at 380 psig, OFF at 255 psig Stage 3, ON at 405 psig, OFF at 280 psig Stage 4, ON at 430 psig, OFF at 305 psig Compressor will unload when the discharge pressure reaches 565 psig. LOW AMBIENT OPERATION Since air-cooled condensers are often required to operate over a wide range of ambient air temperatures and variable loading conditions, provision must be made to maintain the overall system balance. Any air-cooled condenser tends to run at a low head pressure when operating in a low ambient air temperature. Low head pressures will result in poor expansion valve operation and this will in turn cause poor system operation due to the pressure imbalance. within certain limits, without adversely affecting the system operation. The capacity of an air-cooled condenser is directly proportional to the TD, which is the temperature difference between the air temperature entering the condenser and the condensing temperature. A condenser is usually selected to operate on a TD suitable for summer ambient air conditions. The capacity of the condenser is increased when operated at the lower ambient temperature which directly reduces the system head pressure. The lower limit of this varying head pressure is dependent upon the required pressure drop across the thermostatic expansion valve and, for normal air conditioning applications, should be maintained above that corresponding to a condensing temperature of 65 to 70 F. This, in effect, corresponds to an ambient air temperature lower limit of approximately 55 to 60 F. Air conditioning is usually not required at these ambient temperatures. However, to ensure sufficient receiver pressure during compressor start-up, it is recommended that a high-pressure cut-in switch be used to allow the head pressure to rise before the condenser fan starts. Many applications, such as commercial refrigeration, are such that operation is required below the above ranges (55 to 60 F). We offer three methods to maintain a desired condensing pressure: Fan cycling, flood-back valves, combination fan cycling and flood-back valves. LOW AMBIENT CONTROL OPTIONS FAN CYCLING CONTROL On multiple-fan units, individual fan sections can be cycled to not exceed nominal condenser capacity at low ambient conditions. Table 10 provides minimum ambient temperatures for effective fan cycle control. Lower ambient temperatures than listed are not recommended for this method of control. Table 11 gives temperature settings for all units referenced to various design temperature differences. In lieu of temperature control, fan cycling can be controlled by pressure controls using a factory provided pressure transducer inserted (by others) into condenser inlet piping. Specify the type of control when ordering this option. Air conditioning applications generally allow the operating head pressure to vary with the ambient air temperature 24 JOHNSON CONTROLS
25 TABLE 10 - MINIMUM AMBIENT TEMPERATURES FOR FAN CYCLING CONTROL Single-Wide No. of Fans TYPE OF CONDENSER Double-Wide No. of Fans MINIMUM OUTSIDE TEMPERATURE FOR 100% CAPACITY Design Temp Difference (TD F) , TABLE 11 TEMPERATURE SETTINGS FOR FAN CYCLING TYPE OF RECOMMENDED TEMP CONTROL SETTINGS CONDENSER Single-Wide No. of Fans Double-Wide No. of Fans Temp Settings (Stage) Design Temperature Difference (TD F) Setpoint (1) Setpoint (2) Offset (1) Setpoint (3) Offset (2) Offset (1) Setpoint (4) Offset (3) Offset (2) Offset (1) Setpoint (5) Offset (4) Offset (3) Offset (2) Offset (1) JOHNSON CONTROLS 25
26 Temperature Data TABLE 12 GEOGRAPHICAL OUTDOOR DESIGN TEMPERATURE DATA STATE/CITY 1 Summer Design Wet Bulb F 1 Summer Design Dry Bulb F 2 Winter Design Dry Bulb F Alabama Birmingham Arizona Phoenix Tucson Arkansas Little Rock Fresno Los Angeles Oakland California Sacramento San Diego San Franscisco San Jose Colorado Denver Connecticut Hartford District of Columbia Florida Washington Jacksonville Miami Georgia Atlanta Hawaii Honolulu Idaho Boise Illinois Chicago Springfield Indiana Indianapolis Iowa Des Moines Kansas Wichita Kentucky Louisville Louisana New Orleans Shreveport Maine Portland Maryland Baltimore Massachusetts Boston Michigan Detroit Minnesota Duluth Minneapolis Mississippi Jackson Missouri Kansas City St. Louis Montana Billings Nebraska Omaha Nevada Las Vegas Reno New Hampshire Concord New Jersey Newark STATE/CITY 1 Summer Design Wet Bulb F 1 Summer Design Dry Bulb F 2 Winter Design Dry Bulb F New Mexico Albuquerque New York Albany New York North Carolina Charlotte North Dakota Bismark Ohio Cincinnati Cleveland Oklahoma Oklahoma City Oregon Portland Pennsylvania Philadelphia Pittsburgh Rhode Island Providence South Carolina Charleston South Dakota Rapid City Tennesee Memphis Nashville Austin El Paso Texas Fort Worth Houston San Antonio Utah Salt Lake City Vermont Burlington Virginia Richmond Washington Seattle Spokane West Virginia Charleston Wisconsin Milwaukee Wyoming Cheyenne From 2001 ASHRAE Fundamentals Handbook 1. Design temperature shown in columns 1 and 2 are equalled or exceeded during 1% of summer months. 2. December through 99%. 26 JOHNSON CONTROLS
27 JOHNSON CONTROLS 27
28 Form EG1 (1011) Supersedes EG1 (410)
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