Manuals / Carrier / Household Appliance / Air Conditioner

Carrier EK, 48EJ, EW Evaporator Fan Service and Replacement, Evaporator Fan Performance Adjustment

Models: EY024-048 EK 48EJ

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Fig. 47 Ð Typical Gas Heating Section

NOTES:

1.Torque set screws on blower wheel to 70 in. lbs ± 2 in. lbs.

2.Torque set screw on propeller fan to 15 in. lbs ± 2 in. lbs.

3.Dimensions are in inches.

Fig. 47 Ð Typical Gas Heating Section

3. Slide fan pulley along fan shaft.

4. Make angular alignment by loosening motor from mount- ing plate.

5. Retighten pulley.

Evaporator Fan Service and Replacement

	1.	Shut off unit power supply.
	2.	Remove supply-air section panels.
	3.	Remove belt and blower pulley.
	4.	Loosen setscrews in blower wheels.
	5.	Remove locking collars from bearings.
	6.	Remove shaft.
	7.	Remove venturi on opposite side of bearing.
	8.	Lift out wheel.
	9.	Reverse above procedure to reinstall fan.
Fig. 48 Ð Gas Heat Section Details	10.	Check and adjust belt tension as necessary.

Belt Tension Adjustment Ð To adjust belt tension:

Evaporator Fan Performance Adjustment

(Fig. 49) Ð Fan motor pulleys are designed for speed shown in Table 1 (factory speed setting).

IMPORTANT: Check to ensure that the unit drive matches the duct static pressure using Tables 12-14.

1.Shut off unit power supply.

2.Loosen motor mounting nuts and bolts. See Fig. 50.

3.Loosen fan motor nuts.

4.Turn motor jacking bolts to move motor mounting plate left or right for proper belt tension. A slight bow should be present in the belt on the slack side of the drive while running under full load.

To change fan speeds, change pulleys. To align fan and motor pulleys:

1.Shut off unit power supply.

2.Loosen fan shaft pulley bushing.

5.Tighten nuts.

6.Adjust bolts and nut on mounting plate to secure motor in ®xed position. Recheck belt tension after 24 hours of operation. Adjust as necessary.

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Carrier EK, 48EJ, EW, EY024-048 Evaporator Fan Service and Replacement, Belt Tension Adjustment Ð To adjust belt tension

Contents

INSTALLATION Step 1 Ð Provide Unit Support CONTENTSSAFETY CONSIDERATIONS Step 10 Ð Position Power Exhaust/BarometricStep 3 Ð Field Fabricate Ductwork Instructions continued on pageUNIT LEVELING TOLERANCES DIMENSIONS Fig. 1 Ð Roof Curb SizesDegrees and Inches UNIT LEVELING TOLERANCES DIMENSIONS Fig. 2 Ð Roof Curb SizesDegrees and Inches Fig. 3 Ð Base Unit Dimensions, 48EJ,EK024-034 Fig. 4 Ð Base Unit Dimensions, 48EJ,EK038-048 Fig. 5 Ð Base Unit Dimensions, 48EW,EY024-034 Fig. 6 Ð Base Unit Dimensions, 48EW,EY038-048 NOTICE TO RIGGERS ALL PANELS MUST BE IN PLACE WHEN RIGGINGFig. 7 Ð Rigging Label Table 1 Ð Physical Data Table 1 Ð Physical Data cont Fig. 9 Ð Air Distribution Ð Thru-the-Side Fig. 8 Ð Air Distribution Ð Thru-the-BottomFig. 10 Ð Flue Hood Location Typical Roof Curb or Slab Mount Shown Fig. 11 Ð Combustion Fan Housing LocationFig. 12 Ð Condensate Drain Trap Piping Details Fig. 13 Ð Field Gas Piping·support a eld test for eld checkout Fig. 14 Ð Field Control Remote Start/Stop Fig. 15 Ð Indoor Air Quality Sensor CongurationStep 8 Ð Make Electrical Connections Fig. 16 Ð Control Board Diagram Table 4 Ð Electrical Data Table 4 Ð Electrical Data cont Table 4 Ð Electrical Data cont UNITFig. 17 Ð Field Power Wiring Connections Fig. 18 Ð Control Box Diagram SizesFig. 20 Ð Field Control Thermostat Wiring Fig. 19 Ð Control Box Diagram SizesFig. 21 Ð Field Control Temperature Sensor Wiring CV or VAV UnitsFig. 22 Ð Space Temperature Averaging Wiring Table 5 Ð CCN Connection Approved Shielded CablesStep 9 Ð Make Outdoor-AirInlet Adjustments Table 6 Ð Color Code RecommendationsHood Sides Fig. 23 Ð Adding Seal Strip to Top of Hood SidesFig. 25 Ð Adding Seal Strip to Mounting Flange of Fig. 26 Ð Adding Seal Strip to Hood TopFig. 29 Ð Adding Foam Strip to Blockoff Baffle to Filter Track AssemblyFig. 28 Ð Adding Foam Strip to Hood Side Fig. 30 Ð Mounting Angle Without Tabs AttachedFig. 31 Ð Mounting Angle With Tabs Attached to Filter Track AssemblyFig. 32 Ð Attaching Seal Strip to Filter Cover Enthalpy Control HH57AC077 Fig. 34 Ð Wiring Connections for Solid-StateFig. 35 Ð Psychrometric Chart for Enthalpy ControlFig. 37 Ð Barometric Relief Damper and Power Exhaust Mounting DetailsFig. 38 Ð Pressure Transducer Locations Fig. 39 Ð Motormaster III Baffle DetailsSTART-UP Fig. 41 Ð VFD Factory-InstalledJumpers Table 7 Ð VFD Supply Air Pressure Set PointDirect Digital Controls DIP Switch Congura Table 8 Ð Potentiometer Signal LevelsTable 10 Ð DIP Switch Conguration Table 9 Ð Power Exhaust Default Set PointsTable 11 Ð DIP Switch Factory Settings AIRFLOW AIRFLOW 3.20 Table 15 Ð Fan Performance Ð Power Exhaust Table 16 Ð Motor LimitationsSequence of Operation Table 17 Ð Air Quantity LimitsTable 18 Ð User Dened Set Points GAS HEATING, VARIABLE AIR VOLUME VAV UNITS Fig. 42 Ð Heat Interlock Relay Wiring Fig. 43 Ð Space Temperature Reset WiringFig. 44 Ð Field-SuppliedSmoke Detector Wiring Table 19 Ð Smoke Control Modeswith 2 Compressors and 2 Unloaders SERVICEwith 2 Compressors Fig. 45 Ð Door LatchFig. 46 Ð Spark Gap Adjustment LubricationEvaporator Fan Performance Adjustment Evaporator Fan Service and ReplacementBelt Tension Adjustment Ð To adjust belt tension Fig. 47 Ð Typical Gas Heating SectionGas Valve Adjustment Evaporator-FanMotor ReplacementCondenser-FanAdjustment Fig. 49 Ð Evaporator-FanAlignment and AdjustmentFig. 52 Ð Cooling Charging Chart Fig. 50 Ð Belt Tension AdjustmentFig. 51 Ð Condenser-FanAdjustment Fig. 53 Ð Cooling Charging ChartFig. 54 Ð Gas Valve Fig. 55 Ð Main Burner Removal Ð Adjustable Heat Anticipator Page Fig. 57 Ð Typical VAV 115-vControl Circuit Fig. 58 Ð Typical CV 115-vControl Circuit Fig. 59 Ð Typical VAV 24-vControl Circuit Fig. 60 Ð Typical CV 24-vControl Circuit TROUBLESHOOTING HPS Ð High-PressureSwitch LEGEND FPS Ð Freeze Protection SwitchLPS Ð Low-PressureSwitch HPS Ð High-PressureSwitch LEGEND FPS Ð Freeze Protection SwitchLPS Ð Low-PressureSwitch LEGEND IDM Ð Induced-DraftMotor Fig. 64 Ð IGC Control Heating and CoolingIGC Ð Integrated Gas Unit Controller Table 22 Ð IGC Control Board LED Alarms Table 23 Ð Control Board LED AlarmsPage PACKAGED SERVICE TRAINING ELECTRICAL TEMPERATURESPRE-START-UP PRESSURESGENERAL