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Bryant 551A operation manual 33, Troubleshooting, Cooling Service Analysis

Models: 551A

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TROUBLESHOOTING

Refer to Tables 18-20 for troubleshooting details.

Table 18 — Cooling Service Analysis

	PROBLEM	CAUSE	REMEDY
	Compressor and	Power failure.	Call power company.
	condenser fan
	condenser fan	Fuse blown or circuit breaker tripped.	Replace fuse or reset circuit breaker.
	will not start.	Fuse blown or circuit breaker tripped.	Replace fuse or reset circuit breaker.
	will not start.	Defective thermostat, contactor, transformer, or control	Replace component.
		Defective thermostat, contactor, transformer, or control	Replace component.
		relay.
		Insufficient line voltage.	Determine cause and correct.
		Incorrect or faulty wiring.	Check wiring diagram and rewire correctly.
		Thermostat setting too high.	Lower thermostat setting below room temperature.
	Compressor will not start	Faulty wiring or loose connections in compressor circuit.	Check wiring and repair or replace.
	but condenser fan runs.	Compressor motor burned out, seized, or internal	Determine cause. Replace compressor.
		Compressor motor burned out, seized, or internal	Determine cause. Replace compressor.
		overload open.
		Defective overload.	Determine cause and replace.
		Compressor locked out	Determine cause for safety trip and reset lockout.
		One leg of 3-phase power dead.	Replace fuse or reset circuit breaker.
			Determine cause.
	Compressor cycles	Refrigerant overcharge or undercharge.	Recover refrigerant, evacuate system, and recharge
	(other than normally		to nameplate.
	satisfying thermostat).
	satisfying thermostat).	Defective compressor.	Replace and determine cause.
		Defective compressor.	Replace and determine cause.
		Insufficient line voltage.	Determine cause and correct.
		Blocked condenser.	Determine cause and correct.
		Defective overload.	Determine cause and replace.
		Defective thermostat.	Replace thermostat.
		Faulty condenser-fan motor.	Replace.
		Restriction in refrigerant system.	Locate restriction and remove.
	Compressor operates	Dirty air filter.	Replace filter.
	continuously.	Unit undersized for load.	Decrease load or increase unit size.
		Unit undersized for load.	Decrease load or increase unit size.
		Thermostat set too low.	Reset thermostat.
		Low refrigerant charge.	Locate leak, repair, and recharge.
		Air in system.	Recover refrigerant, evacuate system, and recharge.
		Condenser coil dirty or restricted.	Clean coil or remove restriction.
	Excessive head pressure.	Dirty air filter.	Replace filter.
		Dirty condenser coil.	Clean coil.
		Refrigerant overcharged.	Recover excess refrigerant.
		Faulty TXV.	1. Check TXV bulb mounting and secure tightly to
			suction line.
			2. Replace TXV if stuck open or closed.
		Air in system.	Recover refrigerant, evacuate system, and recharge.
		Condenser air restricted or air short-cycling.	Determine cause and correct.
	Head pressure too low.	Low refrigerant charge.	Check for leaks, repair, and recharge.
		Restriction in liquid tube.	Remove restriction.
	Excessive suction	High heat load.	Check for source and eliminate.
	pressure.
	pressure.	Faulty TXV.	1. Check TXV bulb mounting and secure tightly to
			suction line.
			2. Replace TXV if stuck open or closed.
		Refrigerant overcharged.	Recover excess refrigerant.
	Suction pressure too low.	Dirty air filter.	Replace filter.
		Low refrigerant charge.	Check for leaks, repair, and recharge.
		Metering device or low side restricted.	Remove source of restriction.
		Faulty TXV.	1. Check TXV bulb mounting and secure tightly to
			suction line.
			2. Replace TXV if stuck open or closed.
		Insufficient evaporator airflow.	Increase air quantity. Check filter and replace if
			necessary.
		Temperature too low in conditioned area.	Reset thermostat.
		Field-installed filter drier restricted.	Replace.

LEGEND

TXV — Thermostatic Expansion Valve

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Image 33

Bryant 551A operation manual 33, Troubleshooting, Cooling Service Analysis

Contents

— Install Outdoor-AirHood CONTENTS— Install All Accessories X. Step 10 — Install Humidistat for OptionalFig. 1 — Roof Curb Details Fig. 3 — Rigging Details Adapter Roof CurbFig. 4 — Base Unit Dimensions, 551A155 and Fig. 5 — Base Unit Dimensions, 551A240 Table 1 — Physical Data IV. STEP 4 — MAKE UNIT DUCT CONNECTIONS III. STEP 3 — FIELD FABRICATE DUCTWORKV. STEP 5 — TRAP CONDENSATE DRAIN Fig. 6 — Air Distribution — Thru-the-BottomFig. 11 — Field Power Wiring Connections B. Field Control WiringFig. 12 — Field Control Thermostat Wiring Fig. 10 — Condensate Drain Piping DetailsTable 2 — Electrical Data Table 3 — Electric Resistance Heater Data —10—VII. STEP 7 — MAKE OUTDOOR-AIRINLET ADJUSTMENTS Fig. 13 — Optional Non-FusedDisconnect WiringFig. 15 — EconoMi$er Damper Assembly — End View —11—Adjustment Potentiometers Table 4 — Heat Anticipator SettingsVIII. STEP 8 — INSTALL OUTDOOR-AIRHOOD A.Outdoor Air Enthalpy Sensor Installation—13— E. CO2 Control SetupFig. 19 — Seal Strip Location Air Hood Cross-SectionalViewTable 5 — EconoMi$er Switchover Control Strategy G. Dry Bulb Changeover Set UpTable 7 — Default Potentiometer Settings Fig. 23 — Typical EconoMi$er WiringIX. STEP 9 — INSTALL ALL ACCESSORIES H. Ventilation Air Minimum Position Set UpFig. 24 — Typical EconoMi$er Sensor Wiring —15—Fig. 25 — Wind Baffle Details —16——17— Humidistat Wiring Schematic 460V Unit ShownPackage Control Box Fig. 26 — Motormaster I and MotormasterV. INTERNAL WIRING III. REFRIGERANT SERVICE PORTSXI. ACCESSORY ECONOMI$ER ADJUSTMENT —18—D. Freeze Protection Thermostats —19——20— —21— —22— Table 11 — Fan Performance — 551A180—23— Table 12 — Fan Performance — 551A240Table 13 — Accessory/FIOP Static Pressure in. wg Fig. 29 — Perfect Humidity Operation Diagram—24— Table 16 — Evaporator Fan Motor Specifications Table 15 — Fan RPM at Motor Pulley Settings—25— Table 14 — Perfect Humidity DehumidificationI. CLEANING SERVICEIII.EVAPORATOR FAN PERFORMANCE ADJUSTMENT Fig. IV. EVAPORATOR FAN SERVICE AND REPLACEMENTMotor Section V. BELT TENSION ADJUSTMENT and Adjustment—27— Fig. 30 — Evaporator-FanPulley AlignmentFig. 33 — Condenser-FanAdjustment 551A155,180 VI. CONDENSER-FANADJUSTMENTFig. 34 — Condenser-FanAdjustment 551A240 VII. ECONOMI$ER ADJUSTMENT A. LED IndicationC. To Use The Cooling Charging Chart VIII. POWER FAILUREFig. 35 — Cooling Charging Chart D. High- and Low-PressureSwitchesXVI. OPTIONAL HINGED ACCESS DOORS XIV. REPLACEMENT PARTS—30— E. Freeze Protection Thermostat FPT—31— —32— TROUBLESHOOTING Table 18 — Cooling Service Analysis—33— Table 19 — EconoMi$er Troubleshooting Page I. PRE-START-UP TEMPERATURESII. START-UP ELECTRICAL