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HORIZONTAL INDOOR
Model 502A
SINGLE PACKAGE
CeilingPAC
COOLING UNITS 2 to 5 Tons
Single Package Cooling Units Featuring: challenge by specifying heavy insulation, vibration-resistant
construction and operating components that function at low
• compact design
noise levels, all of which keep system sound at a minimum
flexibility
level.
easy maintenance
high quality and reliability When it comes to maintenance, the
EASY MAINTENANCE —
quiet and efficient scroll compressor technology 502A un
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TABLE OF CONTENTS Page Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . 2 ARI Capacity Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Field-Installed Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Base Unit Dimensions . . . . . . . . . . . . . .
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PHYSICAL DATA UNIT 502A 024 036 048 060 SHIPPING WEIGHT (lb)* 560 590 690 700 OPERATING WEIGHT (lb) Base Unit 450 480 580 590 REFRIGERANT TYPE R-22 Operating Charge (lb)† 5.4 5.5 8.0 7.6 COMPRESSOR — TYPE Scroll Quantity...Model (1)...ZR23 (1)...ZR34 (1)...ZR49 (1)...ZR57 Oil (oz) 24 42 48 54 HPS Setting (psig) Cutout 426 ± 7 Reset 320 ± 20 LPS Setting (psig) Cutout 27 ± 4 Reset 67 ± 7 CONDENSATE DRAIN CONNECTION 3 Size (in.)...Type / ...FPT 4 CONDENSER FAN Centrifugal — Direct Drive Centrifugal
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FIELD-INSTALLED ACCESSORIES Thermostat and Subbase — Attractive wall-mounted 24-v Condensate Pump — The condensate pump is used when the accessory provides precise temperature control. Automatic and distance and slope to the nearest drain is far enough to prevent Manual changeover models available. A thermostat subbase is the natural drainage of unit. The pump is mounted remotely available that works with Cycle-LOC™ circuitry. If a safety from the unit and includes a signal light (field-installe
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BASE UNIT DIMENSIONS DIMENSIONS (ft-in.) UNIT ABCD E 502A 5 3 024 2-5 2-1 / 1- 5 / 1-2 1-1 8 4 3 3 036 2-4 / 2-2 1- 5 / 1-2 1-1 4 4 5 7 7 048 2-5 2-3 1-11 / 1-8 / 1-7 / 8 8 8 3 3 5 7 7 060 2-4 / 2-2 / 1-11 / 1-8 / 1-7 / 4 4 8 8 8 Unit Component Locations 5
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SELECTION PROCEDURE (with example) I DETERMINE COOLING REQUIREMENTS AT DESIGN 67 F ewb will provide a Total Capacity (TC) of 44,200 Btuh and a Sensible Heat Capacity (SHC) of 31,300 Btuh. CONDITIONS. Since the entering air is 80 F edb, an SHC correction is Given: not required. Gross Cooling Capacity III DETERMINE EVAPORATOR FAN PERFORMANCE. Required (TC). . . . . . . . . . . . . . . . . . . . . . . . . 39,000 Btuh Enter Evaporator Fan Performance table at 1200 cfm Sensible Heat Capacity (SHC) .
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PERFORMANCE DATA (cont) GROSS COOLING CAPACITIES (cont) 502A048 502A060 Evaporator Air Quantity Cfm/BF Evaporator Air Quantity — Cfm/BF Temp Temp 1200/0.06 1600/0.08 2000/0.10 1500/0.06 2000/0.09 2250/0.10 Air Ent Air Ent Condenser Condenser Evaporator Air Ewb Temp (F) Evaporator Air Ewb Temp (F) (F) (F) 72 67 62 57 72 67 62 57 72 67 62 57 72 67 62 72 67 62 72 67 62 TC 56.0 52.1 47.9 44.4 57.7 54.5 50.6 49.6 59.4 56.0 52.7 52.3 TC 64.8 58.5 52.9 68.0 61.5 56.3 68.9 62.5 58.0 85 SHC 27.8 34.8 41
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PERFORMANCE DATA (cont) BELT DRIVE EVAPORATOR FAN PERFORMANCE (Special Order Only, Pricing and ordering on related price pages.) UNIT SIZE — 502A CFM 048 060 ESP Fan kW ESP Fan kW 1800 ———— 1850 ———— 1900 ———— 1950 .81 1.03 —— 2000 .72 1.05 —— 2050 .63 1.07 —— 2100 .55 1.08 1.02 1.17 2150 .47 1.11 .93 1.21 2200 .42 1.14 .84 1.24 2250 .34 1.17 .75 1.27 LEGEND ESP — External Static Pressure (in. wg) kW — Total Fan Power Motor Input (kilowatts) NOTE: Pulley setting must be adjusted to limit cfm to
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CONTROLS OPERATING SEQUENCE 2. When room thermostat is satisfied, the evaporator fan, com- pressor, and condenser fan shut off. Cooling The thermostat can be set for Continuous Fan Operation — 1. Thermostat calls for cooling. continuous operation by setting the fan switch to ON. a. Indoor (evaporator) fan relay is energized and starts evaporator fan. b. Compressor contactor is energized to start compressor and condenser fan (up to a 5-minute delay on single- phase units). ELECTRICAL DATA FAN MO
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ELECTRICAL DATA (cont) ELECTRIC HEATER STATIC PRESSURE DROP (in. wg) UNIT CFM ELECTRIC HEATER UNIT MIN UNIT 88EN 502A CFM 600 800 1000 1200 1400 1600 1800 2000 2200 0050CA01 400 .02 .04 .06 .10 ————— 024, 036 510 .03 .06 .10 .16 ————— 0075CA01 1-stage 0115CA01 620 heat 0075EA01 320 .04 .08 .13 .19 ————— 1150EA01 720 0100EA01 970 ——— .04 .06 .08 .12 .15 .17 0150EA01 1240 0200EA01 1350 1220 ——— .08 .11 .14 .18 .22 .26 0300EA01 048, 060 0300CA01 1220 2-stage heat 0100FA01 1130 ——— .04 .06 .08 .12 .
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TYPICAL WIRING SCHEMATICS (cont) LEGEND AHA — Adjustable Heat Anticipator TH — Thermostat-Heating NOTES: C — Contactor Compressor TRAN — Transformer 1. Neutral for 240/416 v supply (Canada only). CAP — Capacitor 2. If any original wires furnished must be replaced, it should be Marked Wire CB — Circuit Breaker replaced with 90 C or its equivalent. CC — Cooling Compensator 3. Numbers indicate the line location of used contacts. A bracket Denotes connection point between CDT — Compressor Discharge
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TYPICAL WIRING SCHEMATICS (cont) LEGEND NOTES: AHA — Adjustable Heat Anticipator 2. If any original wires furnished must be replaced, it should be Marked Wire C — Contactor Compressor replaced with 90 C or its equivalent. CAP — Capacitor 3. Numbers indicate the line location of used contacts. A bracket Denotes connection point between CB — Circuit Breaker subbase and thermostat over 2 numbers signifies a single-pole double-throw contact. An CC — Cooling Compensator underlined number signifies a
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TYPICAL WIRING SCHEMATICS (cont) LEGEND AHA — Adjustable Heat Anticipator Denotes connection point between NOTES: BKR W/AT — Breaks with Amp Turns subbase and thermostat C — Contactor Compressor 1. Compressor and fan motors are thermally protected, three-phase CC — Cooling Compensator motors protected against primary single-phase conditions. Terminal (Marked) CLO — Compressor Lockout 2. If any original wires furnished must be replaced, it should be COMP — Compressor Motor Terminal (Unmarked) rep
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TYPICAL PIPING AND WIRING LEGEND NEC — National Electrical Code NOTES: 3. All piping must follow standard refrigerant piping techniques. 1. Wiring and piping shown are not intended for or to include all 4. For other installation details refer to Installation Instructions. details for specific installation. 5. If unit sections are field split, 8 threaded support rods are required. 2. All wiring must comply with applicable local and national codes. 6. Ensure condenser air recirculation is minimize
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GUIDE SPECIFICATIONS INDOOR PACKAGED UNIT C. Fans: HVAC GUIDE SPECIFICATIONS — SECTION 15787 1. Evaporator: SIZE RANGE: 2 TO 5 TONS, NOMINAL a. Blower shall be of the forward-curved, centrifugal, direct-drive type or belt drive (4 and 5 tons only). BRYANT MODEL NUMBER: 502A b. Motor shall have permanently lubricated PART 1 — GENERAL bearings. 1.01 SYSTEM DESCRIPTION c. Unit sizes 048, 060 shall be available with an Indoor mounted, electrically controlled packaged horizon- optional 1.5 hp fan mot
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GUIDE SPECIFICATIONS (cont) 3. Compressor Cycle Delay: 6. Vibration Isolation Package: Prevents compressor from restarting for a minimum Shall provide 4 spring hangers for ceiling mounted of 5 minutes after shutdown. unit to damper vibration that may be transmitted to building structure. * 4. Condensate Pump: 7. Time Guard® II Device: Unit shall be equipped with remotely located con- densate pump. A field-installed light shall illuminate Time Guard II device (024,048,060 single-phase when reserv
