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Carrier 48AW, 48EW, 48EY024-068, 48AY020-060 Typical Gas Heating Section, Gas Heat Section Details

Models: 48EJ 48AJ 48AK 48EK 48AY020-060 48AW 48EY024-068 48EW

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Fig. 65 — 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. 65 — Typical Gas Heating Section

To inspect blower wheel, remove heat exchanger access panel. Shine a flashlight into opening to inspect wheel. If clean- ing is required, remove motor and wheel assembly by remov- ing screws holding motor mounting plate to top of combustion fan housing (Fig. 65 and 66). The motor, scroll, and wheel assembly can be removed from the unit. Remove scroll from plate. Remove the blower wheel from the motor shaft and clean with a detergent or solvent. Replace motor and wheel

		assembly.
		EVAPORATOR COIL — Remove access panels and clean as
		required with commercial coil cleaner.
		CONDENSER COIL — Clean condenser coil annually and
		as required by location and outdoor-air conditions. Inspect coil
		monthly; clean as required.
		CONDENSATE DRAIN — Check and clean each year at
		start of cooling season. In winter, keep drains and traps dry.
		FILTERS — Clean or replace at start of each heating and cool-
		ing season, or more often if operating conditions require. Refer
		to Tables 1A and 1B for type and size.
		NOTE: The unit requires industrial grade throwaway filters
	Fig. 66 — Gas Heat Section Details	capable of withstanding face velocities up to 625 fpm.
	Fig. 66 — Gas Heat Section Details	OUTDOOR-AIR INLET SCREENS — Clean screens with
		OUTDOOR-AIR INLET SCREENS — Clean screens with
		steam or hot water and a mild detergent. Do not use disposable
		filters in place of screens. See Fig. 37 for location of screens
		(filter track assembly).

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Carrier 48AW, 48EW, 48EY024-068, 48AY020-060, 48EK, 48AK, 48AJ, 48EJ Typical Gas Heating Section, Gas Heat Section Details

Contents

INSTALLATION Step 1 — Provide Unit Support CONTENTSSAFETY CONSIDERATIONS Step 11 — Position Power Exhaust/BarometricStep 4 — Make Unit Duct Connections Page Page Page NOTES Fig. 5 - Base Unit Dimensions - 48AJ,AK020-030 Fig. 6 - Base Unit Dimensions - 48AJ,AK035-050 Fig. 7 — Base Unit Dimensions — 48AJ,AK060 Fig. 8 — Base Unit Dimensions — 48AW,AY020-030 Fig. 9 — Base Unit Dimensions — 48AW,AY035-050 Fig. 10 — Base Unit Dimensions — 48W,AY060 Fig. 11 — Base Unit Dimensions — 48EJ,EK024-034 Fig. 12 — Base Unit Dimensions — 48EJ,EK038-048 Fig. 13 — Base Unit Dimensions — 48EJ,EK054-068 Fig. 14 — Base Unit Dimensions — 48EW,EY024-034 Fig. 15 — Base Unit Dimensions — 48EW,EY038-048 Fig. 16 — Base Unit Dimensions — 48EW,EY054-068 Fig. 17 — Rigging Information Fig. 17 — Rigging Information cont Table 1A — Physical Data — 48AJ,AK,AW,AY Units UNIT 48AJ,AK,AW,AY Table 1B - Physical Data - 48EJ,EK,EW,EY Units UNIT 48EJ,EK,EW,EY UNIT 48EJ,EK,EW,EY Table 2 — Operating Weights 48AJ,AK,AW,AY Units48EJ,EK,EW,EY Units Table 3 — Evaporator Fan Motor Data Fig. 18 — Air Distribution — Thru-the-BottomFig. 19 — Air Distribution — Thru-the-Side Step 5 — Install Flue Hood Fig. 23 — Field Gas Piping Table 4 — 48A,E Series Staged Gas ImplementationTable 6 - Thermistor Designations Fig. 24 — Supply-AirThermistor Connections Fig. 25 — Indoor Air Quality Sensor Configuration Fig. 26 - Field Control Remote Start/StopStep 9 - Make Electrical Connections Fig. 27 — Control Board Diagram Table 7 — Electrical Data — 48AJ,AK,AW,AY Units UNIT SIZE 30.8/28.0 236.3/230.9 Table 8 — Electrical Data — 48EJ,EK,EW,EY Units 30.8 0.96 UNIT Fig. 28 - Field Power Wiring Connections Page Thermostat Wiring CV Only- Install a Carrier-approvedaccessory thermostat assembly per current price pages according to the installation instructions included with the ac- cessory or these instructions. Locate the thermostat on a solid interior wall in the conditioned space to sense the average temperature LEGEND Fig. 33 — Field Control Temperature Sensor Fig. 32 — Field Control Thermostat WiringWiring CV or VAV Units Table 9 — CCN Connection Approved Shielded CablesStep 10 — Make Outdoor-AirInlet Adjustments Fig. 35 — Field HIR Heat Interlock Relay WiringFig. 34 - Space Temperature Averaging Wiring Fig. 37 - Economizer Hood Assembly Fig. 36 — Adding Seal Strip to Top of Hood SidesRight Side/Center Economizer Hood Shown Fig. 39 — Adding Seal Strip to Back of Hood Top Fig. 38 — Adding Seal Strip to Sides of Hood TopMounting Flange Fig. 40 — Adding Foam Strip to Cross MemberFig. 43 - Mounting Angle Without Tabs Attached to Filter Track AssemblyFilter Track Assembly Fig. 44 — Mounting Angle With Tabs Attached toFig. 47 - Wiring Connections for Solid-State Enthalpy Control HH57AC077Save screws CONTROL POINT Fig. 49 - Economizer DetailsCONTROL CURVEFig. 51 - Pressure Transducer Locations 48AJ,AK,AW,AY060 and 48EJ,EK,EW,EY054-068Fig. 52 - Motormaster III Control Baffle Details Fig. 53A — Motormaster III Sensor Location48AJ,AK,AW,AY020-030and 48EJ,EK,EW,EY024-034 Fig. 53C — Motormaster III Sensor Location Fig. 53B — Motormaster III Sensor Location48AJ,AK,AW,AY035 and 48EJ,EK,EW,EY038 48AJ,AK,AW,AY040, 050 and 48EJ,EK,EW,EY048Step 13 — Field Modifications Fig. 54 — Side Return Air ConversionFig. 56 — Wiring Field-SuppliedUnloaders for Constant Volume UnitsSTART-UP Factory-InstalledJumpers Fig. 57 - Toshiba TOSVERT130-E3VFD13.Replace jumper across terminals ST and CC 13.Replace jumper across terminals R and CC LEGEND Typical Factory Wiring Optional Field WiringSee below for building pressure to signal level Table 17 — DIP Switch Configuration Table 18 — DIP Switch Factory Settings AIRFLOW AIRFLOW AIRFLOW 1.06 2.15 3.18 4.81 AIRFLOW AIRFLOW AIRFLOW AIRFLOW AIRFLOW AIRFLOW Table 33 — Motor Limitations Table 34 — Air Quality LimitsSequence of Operation Table 35 — User Defined Set Points Table 36 - Software Control Link PointsThe Time Guard function maintains a minimum off time of 5 minutes, a minimum ON time of 10 seconds, and a minimum delay before starting the second compressor of 10 seconds Fig. 59 — Heat Interlock Relay Wiring Table 37 — Staged Gas System Components Table 38 — Stage Gas System Inputs/OutputsFig. 60 — Navigator Display Table 39 — Navigator Display Menu StructureTable 40 - Occupied Heat and Morning Warm-Up Operation and Controlling FactorsFig. 61 — Space Temperature Reset Wiring Fig. 62 - Field-SuppliedSmoke Detector Wiring Table 41 — Smoke Control Modes Table 42 — Cooling Capacity Staging Table, CVUnits with 2 Compressors SERVICE Fig. 64 — Spark Gap AdjustmentFig. 63 — Door Latch Fig. 65 — Typical Gas Heating Section Fig. 66 — Gas Heat Section DetailsFig. 67 — Evaporator-FanAlignment and Adjustment LubricationFig. 68 — Evaporator Fan Coupling Evaporator-FanMotor Replacement Evaporator Fan Service and ReplacementBelt Tension Adjustment — To adjust belt tension Condenser-FanAdjustmentFig. 72 — Cooling Charging Chart Gas Valve AdjustmentFig. 71 — Cooling Charging Chart 48EJ,EK,EW,EY024-03448EJ,EK,EW,EY054-068 Fig. 73 — Cooling Charging ChartFig. 74 — Cooling Charging Chart 48AJ,AK,AW,AY020-060LEGEND for Fig. 77-83— Typical Wiring Schematics Protective DevicesTABLE 1A Fig. 78 — Typical 48EK VAV 24-VControl Circuit Fig. 79 — Typical CV 24-VControl Circuit Fig. 80 — Typical 48EK VAV 115-VControl Circuit Fig. 81 — Typical 48EJ CV 115-VControl Circuit Page Page TROUBLESHOOTING LPS - Low-PressureSwitch FPS — Freeze Protection SwitchHPS - High-PressureSwitch LEGENDcompressor LEGEND FPS — Freeze Protection Switch HPS — High-PressureSwitchLPS — Low-PressureSwitch 8-Pass LEGEND FPS — Freeze Protection Switch HPS — High-PressureSwitchLPS — Low-PressureSwitch LEGEND HPS — High-PressureSwitch LPS — Low-PressureSwitchTXV — Thermostatic Expansion Valve LEGEND HPS - High-PressureSwitchLPS — Low-PressureSwitch TXV — Thermostatic Expansion ValveLEGEND HPS — High-PressureSwitch LPS — Low-PressureSwitchTXV — Thermostatic Expansion Valve LEGEND HPS — High-PressureSwitch LPS — Low-PressureSwitchTXV — Thermostatic Expansion Valve Fig. 94 — IGC Control Heating and Cooling LEGEND IDM — Induced-DraftMotorIGC — Integrated Gas Unit Controller Table 44 - IGC Control Board LED Alarms Table 45 — Control Board LED AlarmsPage SERVICE TRAINING CALL FOR FREE CATALOGELECTRICAL START-UPCHECKLISTPRE-START-UP TEMPERATURESGENERAL