Resumo do conteúdo contido na página número 1
48SS
Product
Single-Package
Data
Gas Heating/Electric Cooling
Units
1
1 ⁄2 to 5 Nominal Tons
Single-Package Rooftop Products
with Energy-Saving Features
• direct spark ignition
• low sound levels
• 81%AFUE on most units
• 10 SEER
Features/Benefits
One-piece heating and
cooling units with low
installation costs, depend-
able performance, and easy
maintenance
Easy installation
Factory-assembled package is a
compact,fullyself-contained,combina-
tion gas heating/electric cooling unit
that is prewired
Resumo do conteúdo contido na página número 2
Energy-saving, direct-spark igni- Direct-drive multispeed, PSC Low and high voltage electrical tion saves gas by operating only (permanent split capacitor) entries allow low and high voltage to when the room thermostat calls for blower motor is standard on all be brought in through either the heating. Standard units are furnished models. front duct panel or rear flue panel. with natural gas controls. A low- Direct-drive, PSC condenser-fan Integrated gas unit controller cost, field-installed kit fo
Resumo do conteúdo contido na página número 3
Table of contents Page Features/Benefits ..................................................1,2 Model Number Nomenclature ........................................3 ARI Capacities ....................................................4,5 Physical Data ......................................................6 Options and Accessories.............................................7 Base Unit Dimensions .............................................8-11 Accessory Dimensions ...................................
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ARI* capacities COOLING CAPACITIES AND EFFICIENCIES NOMINAL STANDARD NET COOLING† SOUND RATINGS** UNIT 48SS SEER† TONS CFM CAPACITIES (Bels) 1 018040 1 ⁄2 600 17,000 10.0 7.4 024040 2 800 24,000 10.0 7.6 024060 030040 1 030060 2 ⁄2 1000 29,200 10.0 8.0 030080 036060 036080 3 1200 36,000 10.0 8.0 036100 036120 042060 042080 1 3 ⁄2 1400 42,500 10.0 8.2 042100 042120 048080 048100 4 1600 47,000 10.0 8.2 048120 048140 060080 060100 5 1995 59,500 10.0 8.2 060120 060140 LEGEND NOTES: 1. Capacity ratin
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HEATING CAPACITIES AND EFFICIENCIES HEATING INPUT OUTPUT CAPACITY TEMPERATURE UNIT 48SS AFUE (%) CSE (%) (Btuh) (Btuh) RISE RANGE (°F) 018040 20-50 81 76.5 024040 40,000 32,800 20-50 81 76.5 030040 20-50 81 76.5 024060 25-55 81 77.5 030060 25-55 81 77.5 60,000 48,600 036060 25-55 81 77.5 042060 25-55 81 77.5 030080 40-70 81 77.5 036080 40-70 81 77.5 042080 80,000 64,800 40-70 81 77.5 048080 40-70 81 77.5 060080 40-70 81 77.5 036100 50-80 81 78.0 042100 50-80 81 78.0 100,000 81,000 048100 50-80 8
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Physical data UNIT SIZE 48SS 018040 024040 024060 030040 030060 030080 036060 036080 036100 036120 1 1 1 1 NOMINAL CAPACITY (ton) 1 ⁄2 22 2⁄2 2⁄2 2⁄2 3333 OPERATING WEIGHT (lb) Without Base Rail 272 303 315 320 324 324 336 336 348 348 With Optional Base Rail 296 327 339 344 356 356 360 360 372 372 COMPRESSORS Rotary Reciprocating Quantity 11 REFRIGERANT (R-22) Charge (lb) 2.60 2.75 2.75 3.40 3.40 3.40 4.30 4.30 4.30 4.30 REFRIGERANT METERING DEVICE Acutrol™ Device Orifice ID (in.) .030 .030 .030
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Options and accessories Factory-installed options UNIT WITH OPTIONAL BASE RAIL Unitwithbaserailprovidesholesforriggingandforklifts aswellasanelevatedmountingframethatgivesadditional structuralsupportforhorizontalinstallations.Idealforlight commercial applications. Downflowoptionunitisshippedfromfactoryconfigured for vertical ductwork connection. Unit is equipped with base rail. Field-installed accessories Factory-assembled roof curbs are designed for use on downflow discharge applications. Heavy ga
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Base unit dimensions 48SS018-042 WITHOUT OPTIONAL BASE RAIL REQ’D CLEARANCES FOR SERVICING. in. (mm) Duct panel ........................0 Unit top.......................36 (914) Side opposite ducts ..................36 (914) Compressor access ..................36 (914) (Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm) Maximum extension of overhangs ............48 (1219) Unit top.......................14 (356) Duct side of unit ....................2 (51) Side opposite
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48SS018-042 WITH OPTIONAL BASE RAIL REQ’D CLEARANCES FOR SERVICING. in. (mm) Duct panel........................0 Unit top ......................36 (914) Side opposite ducts .................36 (914) Compressor access .................36 (914) (Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm) Maximum extension of overhangs...........48 (1219) Unit top ......................14 (356) Duct side of unit....................2 (51) Side opposite ducts .................14 (356
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Base unit dimensions (cont) 48SS048,060 WITHOUT OPTIONAL BASE RAIL REQ’D CLEARANCES FOR SERVICING. in. (mm) Duct panel .......................0 Unit top......................36 (914) Side opposite ducts ................36 (914) Compressor access ................36 (914) (Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm) Maximum extension of overhangs .........48 (1219) Unit top......................14 (356) Duct side of unit...................2 (51) Side opposite ducts
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48SS048,060 WITH OPTIONAL BASE RAIL REQ’D CLEARANCES FOR SERVICING. in. (mm) Duct panel........................0 Unit top ......................36 (914) Side opposite ducts .................36 (914) Compressor access .................36 (914) (Except for NEC requirements) REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm) Maximum extension of overhangs...........48 (1219) Unit top ......................14 (356) Duct side of unit....................2 (51) Side opposite ducts .................14 (356
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Accessory dimensions ROOF CURB DIMENSIONS PART NUMBER ‘‘A’’ CPRFCURB001A00 89 [203] 48SS CPRFCURB002A00 119 [279] CPRFCURB003A00 149 [356] NOTES: 1. Roof curb must be set up for unit being installed. 2. Seal strip must be applied as required for unit being installed. 3. Dimensions in [ ] are in millimeters. 4. Roof curb is made of 16 gage steel. 5. Attach ductwork to curb (flanges of duct rest on curb). 6. Service clearance 4 ft on each side. 7. Direction of airflow. 8. Insulated panels: 1-in. thi
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MANUAL OUTDOOR AIR DAMPER FILTER RACKS AND FILTERS ACCESSORY PART NUMBER ‘‘A’’ 11 CPFILTRK001A00 21 ⁄169 FILTER 11 CPFILTRK002A00 31 ⁄169 RACK 11 CPFILTRK003A00 25 ⁄169 Selection procedure (with example) I Determinecoolingandheatingrequirementsat IV Determine fan speed and power requirements design conditions: at design conditions. Given: Before entering the air delivery tables, calculate the totalstaticpressurerequired.Fromthegiven,theWet Required Cooling Capacity (TC) ......34,000 Btuh CoilPre
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Performance data COOLING CAPACITIES 48SS018 48SS036 EVAPAIR — CFM/BF EVAPAIR — CFM/BF TEMP (F) TEMP (F) 525/0.10 600/0.12 675/0.13 1050/0.07 1200/0.08 1350/0.09 AIR ENT AIR ENT Evap Air — Ewb (F) Evap Air — Ewb (F) COND COND 62 67 72 62 67 72 62 67 72 62 67 72 62 67 72 62 67 72 TC 15.8 17.4 19.0 16.0 17.6 19.2 16.1 17.8 19.3 TC 33.6 37.6 41.7 34.2 38.3 42.3 34.8 38.7 42.6 85 SHC 13.6 11.2 8.7 14.4 11.8 9.0 15.1 12.4 9.2 85 SHC 30.5 25.4 19.9 32.5 27.1 20.7 34.2 28.5 21.4 kW 1.76 1.80 1.85 1.81 1
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COOLING CAPACITIES (cont) LEGEND 48SS048 BF — Bypass Factor EVAPAIR — CFM/BF edb — Entering Dry-Bulb TEMP (F) 1400/0.08 1600/0.10 1800/0.11 Ewb — Entering Wet-Bulb AIR ENT kW — Total Unit Power Input Evap Air — Ewb (F) COND ldb — Leaving Dry-Bulb 62 67 72 62 67 72 62 67 72 lwb — Leaving Wet-Bulb TC 43.8 48.3 52.9 44.5 49.1 53.7 45.1 49.6 53.9 SHC — Sensible Heat Capacity, 1000 Btuh 85 SHC 39.4 32.7 25.6 41.9 34.6 26.4 44.1 36.4 27.1 TC — Total Cooling Capacity, 1000 Btuh (net) kW 4.76 4.85 4.95
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Performance data (cont) DRY COIL AIR DELIVERY* — HORIZONTAL DISCHARGE (Deduct 10% for 208 v) 230 AND 460 VOLT HORIZONTAL DISCHARGE UNIT MOTOR SIZE External Static Pressure (in. wg) SPEED 48SS 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Watts 230 225 220 210 195 170 ————— Low Cfm 760 745 725 695 640 540 ————— 018 Watts ———— 270 235 200 ———— High Cfm ———— 850 700 450 ———— Watts 275 275 273 269 260 257 249 ———— Low Cfm 857 835 802 782 745 717 663 ———— Watts 371 368 360 349 345 326 319 304 293 — — 0
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DRY COIL AIR DELIVERY* — VERTICAL DISCHARGE (Deduct 10% for 208 v) 230 AND 460 VOLT VERTICAL DISCHARGE UNIT MOTOR SIZE External Static Pressure (in. wg) SPEED 48SS 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Watts — 295 251 223 201 176 149 124 — — — Low Cfm — 821 817 753 665 536 343 164 — — — 018 Watts 401 376 346 322 294 272 250 229 219 — — High Cfm 1334 1253 1128 996 816 658 461 246 167 — — Watts — 285 284 282 278 274 270 261 251 244 230 Low Cfm — 798 761 727 682 634 581 525 450 371 304 Watts
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Performance data (cont) WET COIL PRESSURE DROP AIRFLOW PRESSURE DROP UNIT SIZE (cfm) (in. wg) 600 0.069 700 0.082 018 800 0.102 900 0.116 600 0.039 700 0.058 024 800 0.075 900 0.088 900 0.088 030 1000 0.095 1200 0.123 1000 0.068 1200 0.088 036 1400 0.108 1600 0.123 1000 0.048 1200 0.069 042 1400 0.088 1600 0.102 1400 0.068 048 1600 0.075 1800 0.088 1700 0.082 1900 0.095 060 2100 0.108 2300 0.123 FILTER PRESSURE DROP (in. wg) CFM FILTER UNIT SIZE SIZE (in.) 500 600 700 800 900 1000 1100 1200 1300
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Typical piping and wiring HORIZONTAL DISCHARGE Power Wiring Control Wiring OutdoorAirflow IndoorAirflow NEC — National Electrical Code DOWNFLOW DISCHARGE ROOF-MOUNTING CURB ROOF RETURN-AIR FLEXIBLE DUCT SUPPLY-AIR FLEXIBLE DUCT CEILING 19
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Application data Condensatetrap—A2-in.condensatetrapmustbefield Airflow — Units are draw-thru on cooling and blow-thru supplied. on heating. Ductwork—Securedownflowdischargeductworktoroof Maximumcoolingairflow—Tominimizethepossibility curb. For horizontal discharge applications, attach duct- ofcondensateblow-offfromevaporator,airflowthroughunits work to unit with flanges. should not exceed 450 cfm/ton. Toconvertaunittodownflowdischargeorhorizon- Minimum cooling airflow is 350 cfm/ton. taldischarge—Unit
