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Bryant 551A operation manual Roof Curb Details

Models: 551A

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PKG. NO. REF.	CURB	DESCRIPTION
	HEIGHT

CRRFCURB010A00	1′-2″	Standard Curb
	(305)	14″ High

CRRFCURB011A00	2′-0″	Standard Curb
		for Units Requiring
	(610)
		High Installation

CRRFCURB012A00	2′-0″	Side Supply and
		Return Curb for
	(610)
		High Installation

CRRFCURB013A00	2′-0″	High-Static
	(610)	Transition Duct

—2—

NOTES:

1.Roof curb accessory is shipped disassembled.

2.Insulated panels: 1″ thick neoprene coated 11/2 lb density.

3.Dimensions in ( ) are in millimeters.

4. Direction of airflow.

5.Roof curb: 16 ga. (VA03-56) stl.

6.A 90 degree elbow must be installed on the supply ductwork below the unit discharge for units equipped with electric heaters.

NOTE: To prevent the hazard of stagnant water build-up in the drain pan of the indoor section, unit can only be pitched as shown.

DIMENSIONS* (DEGREES AND INCHES)

UNIT		A			B
	Deg.		in.	Deg.	in.

ALL	.28		.45	.28	.43

Fig. 1 — Roof Curb Details

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Bryant 551A operation manual Roof Curb Details

Contents

— Install All Accessories CONTENTS— Install Outdoor-AirHood X. Step 10 — Install Humidistat for OptionalFig. 1 — Roof Curb Details Adapter Roof Curb Fig. 3 — Rigging DetailsFig. 4 — Base Unit Dimensions, 551A155 and Fig. 5 — Base Unit Dimensions, 551A240 Table 1 — Physical Data V. STEP 5 — TRAP CONDENSATE DRAIN III. STEP 3 — FIELD FABRICATE DUCTWORKIV. STEP 4 — MAKE UNIT DUCT CONNECTIONS Fig. 6 — Air Distribution — Thru-the-BottomFig. 12 — Field Control Thermostat Wiring B. Field Control WiringFig. 11 — Field Power Wiring Connections Fig. 10 — Condensate Drain Piping DetailsTable 2 — Electrical Data —10— Table 3 — Electric Resistance Heater DataFig. 15 — EconoMi$er Damper Assembly — End View Fig. 13 — Optional Non-FusedDisconnect WiringVII. STEP 7 — MAKE OUTDOOR-AIRINLET ADJUSTMENTS —11—VIII. STEP 8 — INSTALL OUTDOOR-AIRHOOD Table 4 — Heat Anticipator SettingsAdjustment Potentiometers A.Outdoor Air Enthalpy Sensor InstallationFig. 19 — Seal Strip Location E. CO2 Control Setup—13— Air Hood Cross-SectionalViewTable 7 — Default Potentiometer Settings G. Dry Bulb Changeover Set UpTable 5 — EconoMi$er Switchover Control Strategy Fig. 23 — Typical EconoMi$er WiringFig. 24 — Typical EconoMi$er Sensor Wiring H. Ventilation Air Minimum Position Set UpIX. STEP 9 — INSTALL ALL ACCESSORIES —15——16— Fig. 25 — Wind Baffle DetailsPackage Control Box Humidistat Wiring Schematic 460V Unit Shown—17— Fig. 26 — Motormaster I and MotormasterXI. ACCESSORY ECONOMI$ER ADJUSTMENT III. REFRIGERANT SERVICE PORTSV. INTERNAL WIRING —18——19— D. Freeze Protection Thermostats—20— —21— Table 11 — Fan Performance — 551A180 —22—Table 12 — Fan Performance — 551A240 —23——24— Table 13 — Accessory/FIOP Static Pressure in. wgFig. 29 — Perfect Humidity Operation Diagram —25— Table 15 — Fan RPM at Motor Pulley SettingsTable 16 — Evaporator Fan Motor Specifications Table 14 — Perfect Humidity DehumidificationIII.EVAPORATOR FAN PERFORMANCE ADJUSTMENT Fig. SERVICEI. CLEANING IV. EVAPORATOR FAN SERVICE AND REPLACEMENT—27— and AdjustmentMotor Section V. BELT TENSION ADJUSTMENT Fig. 30 — Evaporator-FanPulley AlignmentFig. 34 — Condenser-FanAdjustment 551A240 VI. CONDENSER-FANADJUSTMENTFig. 33 — Condenser-FanAdjustment 551A155,180 VII. ECONOMI$ER ADJUSTMENT A. LED IndicationFig. 35 — Cooling Charging Chart VIII. POWER FAILUREC. To Use The Cooling Charging Chart D. High- and Low-PressureSwitches—30— XIV. REPLACEMENT PARTSXVI. OPTIONAL HINGED ACCESS DOORS E. Freeze Protection Thermostat FPT—31— —32— —33— TROUBLESHOOTINGTable 18 — Cooling Service Analysis Table 19 — EconoMi$er Troubleshooting Page II. START-UP TEMPERATURESI. PRE-START-UP ELECTRICAL