Carrier 48HJD005-007 specifications MoistureMiser Dehumidification Subcooler Service Analysis

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Table 35 — MoistureMiser Dehumidification Subcooler Service Analysis

PROBLEM	CAUSE		REMEDY
Subcooler will not energize.	No power to control transformer from	Check power source and evaporator-fan relay. Ensure
	evaporator-fan motor.	all wire connections are tight.
	No power from control transformer to liquid line	1.	Fuse open; check fuse. Ensure continuity of wiring.
	solenoid valve	2.	Low-pressure switch open. Cycle unit off and allow
			low-pressure switch to reset. Replace switch if it will
			not close.
		3. Transformer bad; check transformer.
	Liquid line solenoid valve will not operate.	1.	Solenoid coil defective; replace.
		2.	Solenoid valve stuck open; replace.
Subcooler will not deenergize.	Liquid line solenoid valve will not open.	Valve is stuck closed; replace valve.
Low system capacity.	Low refrigerant charge or frosted evaporator	1.	Check charge amount. Charge per Fig. 47-51.
	coil.	2.	Evaporator coil frosted; check and replace low-
			pressure switch if necessary.
Loss of compressor superheat	Thermostatic expansion valve (TXV).	1.	Check TXV bulb mounting, and secure tightly to
conditions with subcooler			suction line.
energized.		2.	Replace TXV if stuck open or closed.

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Contents INSTALLATION CONTENTSSAFETY CONSIDERATIONS Step 1 - Provide Unit SupportFig. 1 - Roof Curb Details 1′-4″Fig. 2 - Unit Leveling Tolerances Fig. 3 - Condensate Drain PanStep 7 - Make Electrical Connections Table 1 - Physical Data Table 1 - Physical Data cont Fig. 5 - Base Unit Dimensions - 48HJ004-007 1/2″3/4″ Thru-the-Curb Service Connections Step 8 - Adjust Factory-Installed OptionsFig. 7 - Gas Piping Guide With Accessory Fig. 6 - Flue Hood DetailsFig. 8 - Power Wiring Connections Fig. 10 - Field Control Wiring RacewayFig. 9 - Low-Voltage Connections With or Without Economizer Never operate a motor where a phase imbalance in supply volt age is greater than 2%. Use the following formula to determinethe percent of voltage imbalance Table 2C - 48HJ High-Static Motor Units Without Electrical Convenience Outlet Fig. 11 - Accessory Field-Installed Humidistat 208/230-V Unit ShownFig. 16 - Horizontal Durablade Economizer Installation Fig. 13 - Typical Access Panel LocationsFig. 15 - Durablade Economizer Installed in Unit Fig. 14 - Outdoor-Air Hood DetailsFig. 19B - Durablade Economizer Minimum Position Damper Setting Wiring HarnessFig. 19A - Durablade Economizer Damper Minimum Position Setting Fig. 20 - Outdoor-Air Thermostat Enthalpy Control InstallationFig. 25 - Exhaust Air Hood Assembly Relief Damper CharacteristicsFig. 24 - Typical Access Panel Locations Fig. 22 - Durablade Economizer BarometricFig. 27 - Completed Hood Assembly Fig. 28 - Rear EconoMi$er Flange InstallationFig. 26 - Outdoor-Air Hood Assembly Fig. 29 - EconoMi$er InstalledFig. 32 - Wiring Diagram for Power Exhaust System Fig. 31 - EconoMi$er Sensor WiringFig. 33 - Typical Access Panel Locations POWER EXHAUST SYSTEM HIGH VOLTAGEFig. 35 - EconoMi$er Control Adjustment Fig. 34 - Supply-Air Sensor PlacementTable 4 - Default Potentiometer Settings Potentiometers Factory SettingsStep 9 - Adjust Evaporator-Fan Speed - Ad Fig. 38 - Evaporator-Fan Pulley AdjustmentFig. 37 - Belt-Drive Motor Mounting Table 5A - 48HJ Fan Rpm at Motor Pulley Setting With Standard Motor Table 6 - Evaporator-Fan Motor Data - Standard MotorTable 7 - Evaporator-Fan Motor Data - High-Static Motors Table 8 - Motor Nominal Horsepower Table 9 - Outdoor Sound Power Total UnitBels Table 12 - 48HJ005 Fan Performance - Vertical Discharge Units With Standard Motor Single-Phase Units 3-Phase UnitsTable 16 - 48HJ007 Fan Performance - Vertical Discharge Units With Standard Motor Table 18 - 48HJ004 Fan Performance - Horizontal Discharge Units With Standard Motor Table 20 - 48HJ005 Fan Performance - Horizontal Discharge Units With Standard Motor 3-Phase Units Table 27 - FIOP MoistureMiser Dehumidification FIOP - Factory-Installed OptionTable 26 - Economizer Static Pressure Drop in. wg Package Static Pressure Drop in. wgPRE-START-UP START-UPHeating Operating SequenceTable 28 - Altitude Compensation When the supply-air temperature falls between 57 F and Fig. 39 - MoistureMiser Option Operation Fig. 40 - Cleaning Condenser Coil Fig. 41 - Propping Up Top Panel SERVICELubrication Fig. 42 - Separating Coil SectionsFig. 43 - Condenser-Fan Adjustment Fig. 44 - Cooling Charging Chart Standard 48HJ004Fig. 45 - Cooling Charging Chart Standard 48HJ005 Fig. 46 - Cooling Charging Chart Standard 48HJ006 Fig. 47 - Cooling Charging Chart Standard 48HJ007Fig. 48 - Cooling Charging Chart, 48HJ004 with Optional MoistureMiser Dehumidification Package Table 29 - LED Error Code Description Fig. 52 - Burner Section Details Fig. 53 - Burner Tray DetailsMEDIUM AND HIGH HEAT 48HJE005-007, 48HJF004 - 115,000 BTUH INPUT Fig. 54 - Spark Gap AdjustmentLOW HEAT 48HJE004, 48HJD005-007 - 72,000 BTUH INPUT 48HJF005-007 - 150,000 BTUH INPUTTROUBLESHOOTING Table 30 - LED Error Code Service AnalysisTable 31 - Heating Service Analysis Table 32 - Durablade Economizer Service AnalysisTable 34 - EconoMi$er Troubleshooting Table 33 - EconoMi$er Flash Code IdentificationCritical Table 35 - MoistureMiser Dehumidification Subcooler Service Analysis Table 36 - Cooling Service Analysis Compressor operates continuouslyFig. 55 - Typical Wiring Schematic and Component Arrangement 208/230 3-Phase Unit ShownLEGEND AND NOTES FOR FIG NOTES FOR FIGReplaces 48HJ-17SI Page II. PRE-START-UP insert checkmark in box as each item is completed START-UP CHECKLIST Remove and Store in Job FileI. PRELIMINARY INFORMATION III. START-UP