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installation, start-up and
551B
service instructions
DuraPac Plus Series
Sizes 090-150
SINGLE PACKAGE ROOFTOP
1 1
7 / to 12 / Tons
2 2
ELECTRIC COOLING UNITS
Cancels: II 551B-90-6 II 551B-90-7
10/15/05
I. STEP 1 — PROVIDE UNIT SUPPORT
CONTENTS
A. Roof Curb
Assemble and install accessory roof curb in accordance with
Page
instructions shipped with curb. Install insulation, cant
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
strips, roofing felt, and counter flashing as s
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Fig. 1 — Horizontal Conversion Panels III. STEP 3 — INSTALL CONDENSATE DRAIN LINE AND Spreader bars are not required if top crating is left on unit. EXTERNAL TRAP Rollers may be used to move unit across a roof. Level by using unit frame as a reference. See Table 1 and Fig. 6 for Condensate drain connections are located at the bottom and additional information. Operating weight is shown in end of the unit. Unit discharge connections do not determine Table 1 and Fig. 6. the use of drain connection
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ROOF CURB “A” UNIT SIZE ACCESSORY CONNECTOR D ALT ACCESSORY BC GAS POWER CONTROL PKG. ACCY. DRAIN HOLE POWER CRRFCURB003A01 1′-2″ [356] 551B090-150 3 CRBTMPWR001A01 3 / ″ [19] NPT / ″ 4 CRRFCURB004A01 2′-0″ [610] 4 [19] NPT 1 CRBTMPWR002A01 1 / ″ [31.7] 4 7 15 3 1 1 2′-8 / ″ 1′-10 / ″ 1 / ″ 1 / ″ / ″ 16 16 4 / ″ 2 2 NOTES: 2 3 CRBTMPWR003A01 / ″ [19] NPT 4 [827] [583] [44.5] [12.7] NPT [12.7] NPT [12.7] NPT 1. Roof curb accessory is shipped disassembled. 2. Insulated panels: 1-in. thick polyure
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MAXIMUM ALLOWABLE DIFFERENCE (in.) A-B B-C A-C 0.5 1.0 1.0 NOTE: Trap should be deep enough to offset maximum unit static differ- Fig. 3 — Unit Leveling Tolerances ence. A 4-in. trap is recommended. Fig. 5 — Condensate Drain Piping Details HORIZONTAL DRAIN PLUG DRAIN OUTLET NOTE: Drain plug is shown in factory-installed position. Fig. 4 — Condensate Drain Location NOTES: OPERATING 1. Place unit on curb as close as possible to the duct end. AB C WEIGHT 551B 2. Dimension in ( ) is in millimeters
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—5— Fig. 7 — Base Unit Dimensions
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Table 1 — Physical Data UNIT 551B 090 102 120 150 1 1 1 NOMINAL CAPACITY (tons) 7 / 8 / 10 12 / 2 2 2 OPERATING WEIGHT (lb) Unit 755 895 915 930 EconoMi$er IV 75 75 75 75 Perfect Humidity™ Dehumidification Package 44 51 51 51 Roof Curb 143 143 143 143 COMPRESSOR Scroll Quantity 2222 Oil (oz) (each compressor) 53 53 50 60 REFRIGERANT TYPE R-22 Expansion Device Metering Device Operating Charge (lb-oz) Standard Unit Circuit 1 7-10 9- 8 9-6 9-8 Circuit 2 8- 2 8-13 10-9 9-5 Unit With Perfect Humidity
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V. STEP 5 — MAKE ELECTRICAL CONNECTIONS When installing units, provide a disconnect per the NEC. All field wiring must comply with the NEC and local require- WARNING: Unit cabinet must have an uninter- ments. In Canada, electrical connections must be made in rupted, unbroken electrical ground to minimize the accordance with CSA (Canadian Standards Association) possibility of personal injury if an electrical fault C22.1 Canadian Electrical Code Part One. should occur. This ground may consist of
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Table 2 — Electrical Data VOLTAGE ELECTRIC HEATER POWER SUPPLY DISCONNECT COMP NO. 1 COMP NO. 2 RANGE SIZE† Fuse UNIT NOMINAL IFM CONV OFM OFM IFM Nominal or 551B V-PH-Hz TYPE OUTLET QTY FLA FLA FLA MCA MOCP Min Max RLA LRA RLA LRA kW* HACR FLA LRA Bkr — —/— 38.2/ 38.2 45/45 — 40/ 40 242/242 7.8/10.4 21.7/ 25.0 38.2/ 40.6 45/45 — 40/ 40 242/242 12.0/16.0 33.4/ 38.5 51.1/ 57.5 60/60 — 47/ 53 242/242 STD NO 187 254 12.4 88.0 12.4 88.0 2 1.4 7.5 18.6/24.8 51.7/ 59.7 74.0/ 84.0 — 80/ 90 68/ 77 242/
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Table 2 — Electrical Data (cont) VOLTAGE ELECTRIC HEATER POWER SUPPLY DISCONNECT COMP NO. 1 COMP NO. 2 RANGE SIZE† Fuse UNIT NOMINAL IFM CONV OFM OFM IFM Nominal or 551B V-PH-Hz TYPE OUTLET QTY FLA FLA FLA MCA MOCP Min Max RLA LRA RLA LRA kW* HACR FLA LRA Bkr — — 18.2 20 — 19 114 STD NO 518 632 6.4 44.0 6.4 44.0 2 0.7 3.4 17.0 16.4 23.8 20 — 22 115 34.0 32.7 44.3 45 — 41 115 — — 20.4 25 — 21 116 STD YES 518 632 6.4 44.0 6.4 44.0 2 0.7 3.4 17.0 16.4 26.5 25 — 24 116 34.0 32.7 46.9 50 — 43 116 10
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LEGEND AND NOTES FOR TABLE 2 LEGEND Example: Supply voltage is 460-3-60. FLA — Full Load Amps AB = 452 v HACR — Heating, Air Conditioning and Refrigeration BC = 464 v IFM — Indoor (Evaporator) Fan Motor AC = 455 v LRA — Locked Rotor Amps MCA — Minimum Circuit Amps 452 + 464 + 455 Average Voltage = MOCP— Maximum Overcurrent Protection 3 NEC — National Electrical Code OFM — Outdoor (Condenser) Fan Motor 1371 RLA — Rated Load Amps = 3 = *Heater capacity (kW) is based on heater voltage of 208, 240,
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B. Field Control Wiring UL required clearance between the high-voltage and low-voltage wiring. Install a Bryant-approved accessory thermostat assembly according to installation instructions included with the 5. Connect thermostat wires to screw terminals of low- accessory. Locate thermostat assembly on a solid wall in the voltage connector (see Fig. 9). conditioned space to sense average temperature in accor- NOTE: If thru-the-bottom power connections are used refer dance with thermostat install
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3. Use a wire nut to connect humidistat cable into low- 3. A field-supplied relay must be installed between the voltage wiring as shown in Fig. 13. Thermidistat device and the Perfect Humidity™ cir- cuit (recommended relay: HN612KK324) Fig. 14. The To install Thermidistat™ device: relay coil is connected between the DEHUM output 1. Route Thermidistat cable through hole provided in and C (common) of the unit. The relay controls the unit corner post. Perfect Humidity solenoid valve and must be wir
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C. Convenience Outlet 1. To remove the existing unit filter access panel, raise the panel and swing the bottom outward. The panel is An optional convenience outlet provides power for rooftop now disengaged from the track and can be removed. use. For maintenance personnel safety, the convenience out- See Fig. 20. let power is off when the unit disconnect is off. Adjacent unit outlets may be used for service tools. An optional “Hot Out- let” is available from the factory as a special order item. D
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2. The box with the economizer hood components is position past the open filter clips. Close the filter clips shipped in the compartment behind the economizer. to lock the filter into place. See Fig. 24. The EconoMi$er IV controller is mounted on top of 8. Caulk the ends of the joint between the unit top panel the EconoMi$er IV in the position shown in Fig. 19. and the hood top. See Fig. 22. To remove the component box from its shipping posi- 9. Replace the filter access panel. tion, remove the
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22 1/4” TOP PANEL INDOOR COIL ACCESS PANEL DIVIDER LEFT HOOD SCREW OUTSIDE SIDE AIR B 24 9/16” HOOD CLEANABLE 40 3/8” ALUMINUM FILTER FILTER HOOD DIVIDER BAROMETRIC RELIEF Fig. 23 — Outdoor-Air Hood Construction FILTER CLIP Fig. 24 — Filter Installation FOR OCCUPANCY CONTROL REPLACE JUMPER WITH FIELD-SUPPLIED TIME CLOCK LEGEND Potentiometer Defaults Settings: NOTES: Power Exhaust Middle 1. 620 ohm, 1 watt 5% resistor should be removed only when using differential DCV— Demand Controlled Ventilati
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Table 5 — Supply Air Sensor Temperature/Resistance Values 2500 TEMPERATURE (F) RESISTANCE (ohms) 2000 –58 200,250 1500 –40 100,680 –22 53,010 1000 –4 29,091 14 16,590 500 32 9,795 0 50 5,970 0.05 0.15 0.25 68 3,747 STATIC PRESSURE (in. wg) 77 3,000 86 2,416 Fig. 26 — Barometric Relief Flow Capacity 104 1,597 122 1,080 140 746 158 525 176 376 185 321 30 194 274 212 203 25 230 153 20 248 116 15 257 102 266 89 10 284 70 5 302 55 0 0.13 0.20 0.22 0.25 0.30 0.35 0.40 0.45
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Outdoor Dry Bulb Changeover The standard controller is shipped from the factory configured for outdoor dry bulb changeover control. The outdoor air and supply air temperature sensors are included as standard. For this control mode, the outdoor temperature is compared to an adjustable set point selected on the control. If the outdoor-air temperature is above the set point, the EconoMi$er IV will adjust the outdoor-air dampers to minimum position. If the outdoor-air temperature is below the set po
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Indoor Air Quality (IAQ) Sensor Input AQ1 terminals of the controller. Adjust the DCV potentiome- ters to correspond to the DCV voltage output of the indoor air The IAQ input can be used for demand control ventilation quality sensor at the user-determined set point. See Fig. 35. control based on the level of CO measured in the space or 2 return air duct. If a separate field-supplied transformer is used to power the IAQ sensor, the sensor must not be grounded or the Mount the accessory IAQ sensor
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Exhaust Set Point Adjustment To control the minimum damper position remotely, remove the factory-installed jumper on the P and P1 terminals on The exhaust set point will determine when the exhaust fan the EconoMi$er IV controller. Wire the field-supplied poten- runs based on damper position (if accessory power exhaust is tiometer to the P and P1 terminals on the EconoMi$er IV installed). The set point is modified with the Exhaust Fan controller. See Fig. 34. Set Point (EXH SET) potentiometer. Se
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Once base ventilation has been determined, set the mini- 3. Use the Up/Down button to select the preset number. mum damper position potentiometer to the correct position. See Table 7. 4. Press Enter to lock in the selection. The same equation can be used to determine the occupied or maximum ventilation rate to the building. For example, an 5. Press Mode to exit and resume normal operation. output of 3.6 volts to the actuator provides a base ventilation The custom settings of the CO sensor can be
