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349687-JTG-A-1007
DESCRIPTION
Johnson Controls Series 20 J**DJ units are convertible single
package high efficiency rooftops. All models have indepen-
dent dual refrigerant circuits for efficient part load operation.
Although the units are primarily designed for curb mounting
TECHNICAL GUIDE
on a roof, they can also be slab-mounted at ground level or
set on steel beams above a finished roof.
All units include:
SERIES 20
• Powder Paint finish that meets ASTM-B-117 750 hour
SINGLE PACKAGE GAS
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349687-JTG-A-1007 TABLE OF CONTENTS Tbl. # Pg. # DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 8 ALTITUDE CORRECTION FACTORS . . . . . . . . . . . . 14 PRODUCT NOMENCLATURE . . . . . . . . . . . . . . . . . 3 9 SUPPLY AIR BLOWER PERFORMANCE (15 TON) - FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 COOLING ONLY 180 MBH - BOTTOM DUCT FACTORY-INSTALLED OPTIONS . . . . . . . . . . . . . . 5 CONNECTIONS . . . . . . . . . . . . . . . . . . . . .
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349687-JTG-A-1007 PRODUCT NOMENCLATURE 15-25 Ton Series 20 Model Number Nomenclature J15 DJ N24 A 2 A AA 1 0 1 2 4 A Nominal Cooling Capacity Product Style J15 = 15 Ton A = Style A J18 = 17.5 Ton J20 = 20 Ton J25 = 25 Ton Configuration Options (not required for all units) These four digits will not be assigned until a quote is requested, or an order placed. Product Category SS Drain Pan Johnson UNT 1126 Controller (N2 protocol), DFS, APS D = A/C, Single Pkg., R-22 Johnson Light Commercial Contro
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349687-JTG-A-1007 • Low Ambient - An integrated low-ambient control FEATURES allows all units to operate in the cooling mode down All Series 20 J**DJ models are available with a wide variety to 0ºF outdoor ambient without additional assis- of factory-mounted options such as stainless steel heat tance. Optionally, the control board can be pro- exchangers, phase monitor, dirty filter switch, and coil guard grammed to lockout the compressors when the to make them suitable for almost every app
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349687-JTG-A-1007 UNIT FIGURE 1 - UNIT CUTAWAY with aluminized steel or optional stainless steel tubes, a ble of introducing up to 100% outdoor air with nominal redundant gas valve, spark ignition, power venting, an 1% leakage type dampers. ignition module for 100% shut-off and all of the safety The enthalpy system contains one sensor that monitors controls required to meet the latest ANSI standards. the outdoor air and determines when the air is cool The gas supply piping can be routed in
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349687-JTG-A-1007 • POWER EXHAUST - Our economizer options are avail- Due to space limitations, VAV is not available with any of able with power exhaust. Whenever the outdoor air the factory-installed BAS options described below, but is intake dampers are opened for free cooling, the exhaust available with ‘BAS-ready’ models. Terminal blocks are fan will be energized to prevent the conditioned space provided in the control box for field wiring of the cus- from being over-pressurized during ec
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349687-JTG-A-1007 • SMOKE DETECTORS - (supply air & return air) The • Johnson UNT 1126 Rooftop Controller - N2 protocol smoke detectors stop operation of the unit by interrupting with air proving and dirty filter sensors. Hardware con- power to the control board if smoke is detected within the tains generic application logic; field engineering and/or air compartment. modification may be required. FIELD-INSTALLED ACCESSORIES • SINGLE INPUT ELECTRONIC ENTHALPY ECONO- MIZERS - Includes a slide-i
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349687-JTG-A-1007 accessory includes a rain hood, a bird screen and a fully • FLUE EXHAUST EXTENSION KIT - In locations with assembled damper. With bottom duct connections, the wind or weather conditions which may interfere with damper should be mounted over the opening in the proper exhausting of furnace combustion products, this return air panel. With horizontal ductwork, the accessory kit can be installed to prevent the flue exhaust from should be mounted on the return air duct. entering
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349687-JTG-A-1007 1 TABLE 1: SOUND POWER RATING -12 SOUND POWER (db 10 Watts) ESP BLOWER UNIT Octave Band Centerline Frequency (Hz) dB(A) CFM SWL SIZE @ dB(A) IWG RPM BHP 63 125 250 500 1,000 2,000 4,000 8,000 2 10Ft. J15DJ 6,000 1.00 1,080 4.60 99 99 89 82 84 77 72 67 89 56 J18, 20 DJ 8,000 1.00 1,120 6.65 102 102 92 85 87 80 75 70 92 59 J25DJ 10,000 1.30 1160 12.5 108 108 98 91 93 86 81 76 98 65 1. These values have been accessed using a model of sound propagation from a point source into the
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349687-JTG-A-1007 TABLE 4: COOLING CAPACITIES FOR J15DJ Temperature of Air on Condenser Coil Air on Evaporator Coil 85°F 95°F 2 2 * * Total Total Sensible Capacity (MBH) Total Total Sensible Capacity (MBH) WB 1 1 CFM Cap. Input Return Dry Bulb (°F) Cap. Input Return Dry Bulb (°F) (°F) (MBH) (kW) 86 83 80 77 74 71 68 (MBH) (kW) 86 83 80 77 74 71 68 72 206.811.94119.7106.894.081.268.3 - - 196.112.98115.7102.990.177.364.4 - - 67 187.411.64148.6135.7122.9110.197.284.471.6178.112.70144.6131.8119.0106
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349687-JTG-A-1007 TABLE 5: COOLING CAPACITIES FOR J18DJ Temperature of Air on Condenser Coil Air on Evaporator Coil 85°F 95°F 2 2 * * Total Total Sensible Capacity (MBH) Total Total Sensible Capacity (MBH) WB 1 1 CFM Cap. Input Return Dry Bulb (°F) Cap. Input Return Dry Bulb (°F) (°F) (MBH) (kW) 86 83 80 77 74 71 68 (MBH) (kW) 86 83 80 77 74 71 68 72 238.9 14.24 142.6 125.5 108.4 91.3 74.2 - - 222.9 15.81 136.5 119.4 102.3 85.2 68.1 - - 67 221.2 13.83 178.6 161.5 144.4 127.3 110.2 93.1 76.0 207.
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349687-JTG-A-1007 TABLE 6: COOLING CAPACITIES FOR J20DJ Temperature of Air on Condenser Coil Air on Evaporator Coil 85°F 95°F 2 2 * * Total Total Sensible Capacity (MBH) Total Total Sensible Capacity (MBH) WB 1 1 CFM Cap. Input Return Dry Bulb (°F) Cap. Input Return Dry Bulb (°F) (°F) (MBH) (kW) 86 83 80 77 74 71 68 (MBH) (kW) 86 83 80 77 74 71 68 72 273.1 16.90 149.8 132.7 115.6 98.5 81.4 - - 257.3 18.45 150.2 133.1 116.0 98.9 81.8 - - 67 248.6 16.43 197.6 180.5 163.4 146.3 129.1 112.0 94.9 237
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349687-JTG-A-1007 TABLE 7: COOLING CAPACITIES FOR J25DJ Temperature of Air on Condenser Coil Air on Evaporator Coil 85°F 95°F 2 2 * * Total Total Sensible Capacity (MBH) Total Total Sensible Capacity (MBH) WB 1 1 CFM Cap. Input Return Dry Bulb (°F) Cap. Input Return Dry Bulb (°F) (°F) (MBH) (kW) 86 83 80 77 74 71 68 (MBH) (kW) 86 83 80 77 74 71 68 72 332.2 21.58 206.4 185.0 163.6 142.3 120.9 - - 324.4 25.42 191.5 170.2 148.8 127.4 106.0 - - 67 327.2 21.26 256.1 234.7 213.3 192.0 170.6 149.2 127.
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349687-JTG-A-1007 CFM, STATIC PRESSURE, AND POWER - ALTI- order to use the indoor blower tables for high altitude applica- tions, certain corrections are necessary. TUDE AND TEMPERATURE CORRECTIONS A centrifugal fan is a "constant volume" device. This means The information below should be used to assist in application that, if the rpm remains constant, the CFM delivered is the of product when being applied at altitudes at or exceeding same regardless of the density of the air. However, since t
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349687-JTG-A-1007 FIGURE 2 - ALTITUDE/TEMPERATURE CONVERSION FACTOR Johnson Controls Unitary Products 15
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349687-JTG-A-1007 TABLE 9: SUPPLY AIR BLOWER PERFORMANCE (15 TON) - COOLING ONLY 180 MBH - BOTTOM DUCT CONNECTIONS MOTOR CFM BLOWER PULLEY 4500 5250 6000 6750 7200 SPEED, (TURNS (RPM) ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW OPEN)* 208 VOLT AND STANDARD DRIVE 850 6.0** 0.9 2.4 2.2 0.7 3.0 2.7 0.5 3.2 2.9 - - - - - - 870 5.5 1.0 2.5 2.3 0.8 3.1 2.8 0.6 3.5 3.1 0.2 4.1 3.7 - - - 915 4.5 1.1 2.6 2.4 0.9 3.4 3.0 0.7 3.7 3.3 0.3 4.4 3.9 0.2 4.5 4.0 965 3.5 1.2 2.9 2.6 1.0 3.6 3.2 0.8 4.
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349687-JTG-A-1007 TABLE 10: SUPPLY AIR BLOWER PERFORMANCE (17.5 TON) - COOLING ONLY 210 MBH - BOTTOM DUCT CONNECTIONS MOTOR CFM BLOWER PULLEY 6000 7000 8000 9000 SPEED, (TURNS (RPM) ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW OPEN)* 208 VOLT AND STANDARD DRIVE 870 6.0** 0.4 2.1 1.8 0.1 2.3 2.0 - - - - - - 900 5.0 0.8 3.2 2.7 0.5 3.5 2.9 0.2 3.8 3.2 - - - 930 4.0 1.1 4.1 3.4 0.9 4.5 3.8 0.6 4.9 4.1 0.1 5.1 4.3 950 3.0 1.3 4.6 3.9 1.1 5.1 4.3 0.8 5.5 4.6 0.4 5.9 5.0 980 2.0 1.6 5.3 4.5 1.4 5.8 4.9
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349687-JTG-A-1007 TABLE 11: SUPPLY AIR BLOWER PERFORMANCE (20 TON) - COOLING ONLY 240 MBH - BOTTOM DUCT CONNECTIONS MOTOR CFM BLOWER PULLEY 6000 7000 8000 9000 9400 SPEED, (TURNS (RPM) ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW OPEN)* 208 VOLT AND STANDARD DRIVE 870 6.0** 0.4 2.1 1.8 0.1 2.3 2.0 ------ --- 900 5.0 0.8 3.2 2.7 0.5 3.5 2.9 0.2 3.8 3.2 - - - - - - 930 4.0 1.1 4.1 3.4 0.9 4.5 3.8 0.6 4.9 4.1 0.1 5.1 4.3 - - - 950 3.0 1.3 4.6 3.9 1.1 5.1 4.3 0.8 5.5 4.6 0.4 5.9 5.0 - - -
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349687-JTG-A-1007 TABLE 12: SUPPLY AIR BLOWER PERFORMANCE (15 TON) - GAS HEAT 180 MBH - BOTTOM DUCT CONNECTIONS MOTOR CFM BLOWER PULLEY 4500 5250 6000 6750 7200 SPEED, (TURNS (RPM) ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW OPEN)* 208 VOLT AND STANDARD DRIVE 850 6.0** 0.9 2.4 2.1 0.6 2.9 2.6 0.3 3.4 3.0 - - - - - - 870 5.5 1.0 2.5 2.2 0.7 3.0 2.7 0.4 3.5 3.1 - - - - - - 915 4.5 1.1 2.6 2.4 0.8 3.1 2.8 0.5 3.6 3.2 0.2 4.1 3.7 - - - 965 3.5 1.2 2.7 2.5 0.9 3.2 2.9 0.6 3.7 3.3 0.4 4.4 3
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349687-JTG-A-1007 TABLE 13: SUPPLY AIR BLOWER PERFORMANCE (17.5 TON) - GAS HEAT 210 MBH - BOTTOM DUCT CONNECTIONS MOTOR CFM BLOWER PULLEY 6000 7000 8000 9000 SPEED, (TURNS (RPM) ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW OPEN)* 208 VOLT AND STANDARD DRIVE 870 6.0** 1.33.6 3.00.7 4.33.7 0.25.1 4.3 - - - 900 5.0 1.43.8 3.20.9 4.74.0 0.45.6 4.7 - - - 930 4.0 1.64.1 3.41.1 5.04.2 0.65.9 5.00.1 6.75.7 950 3.0 1.74.2 3.61.3 5.14.3 0.86.0 5.10.2 6.95.8 980 2.0 1.94.5 3.81.5 5.44.5 1.06.3 5.30.4 7.26.1
