Carrier 48HJD005-007 specifications Supply-Air Sensor Placement, Changeover Set Points

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Fig. 34 — Supply-Air Sensor Placement

SUPPLY AIR

TEMPERATURE

SENSOR

MOUNTING

LOCATION

SUPPLY AIR

TEMPERATURE Table 3 — Changeover Set Points

SENSOR

Fig. 34 — Supply-Air Sensor Placement

CO2 Control Setup — If a CO2 sensor is not being used, pro- ceed to the next section. If a CO2 sensor is being used, perform the following:

1.Determine the value at which you want the minimum po- sition of the dampers to begin opening to allow a greater amount of outdoor air to enter. The range is 800 to 1,400 ppm.

2.Locate the CO2 SP (PPM) potentiometer and adjust to the desired set point. See Fig. 35.

Mechanical Cooling Lockout — Determine the outdoor-air temperature at which you want the mechanical cooling (com- pressors) to be disabled. Locate the mechanical cooling lockout (MECH CLG LOCKOUT) potentiometer. To disable this fea- ture, turn the potentiometer counterclockwise (CCW) to the OFF position. Otherwise, set the value between 10 and 60 F. Mechanical cooling will not operate when the outdoor air temperature is below this value. See Fig. 35.

Dry Bulb Changeover Set Up — Determine the dry bulb changeover set point from Table 3. The settings are A, B, C and D. Locate the ECON SP potentiometer and set the dry bulb changeover set point. See Fig. 35. When the OAT is above this set point, the damper is limited to minimum position setting.

Table 3 — Changeover Set Points

SETTINGS

A

B

C

D

Dry Bulb (°F)

73

69

66

63

Single Enthalpy* (Btu/lb)

27

25

24

22

Differential Temperature* (°F, Not Adjustable)

2

2

2

2

Differential Enthalpy* (Btu/lb, Not Adjustable)

1

1

1

1

*Field-installed accessory.

If a potentiometer fails, its setting will default to the values in Table 4.

Table 4 — Default Potentiometer Settings

POTENTIOMETER

DEFAULT SETTING

CO2 SP (PPM)

1,000

MECH CLG LOCKOUT

47°

ECON SP

D

MIN POS (%)

20

Ventilation Air (Minimum Position Set Up) — If ventilation air is not required, proceed to Step 5. If ventilation air is re- quired, perform the following:

1.The indoor fan must be on to set the ventilation air. Either put the thermostat in the continuous fan mode or jumper the R and G terminals at the rooftop unit connection board.

2.Locate the minimum position (MIN POS) potentiometer. Turn the potentiometer full CCW to fully close the out- door air dampers. Turn the potentiometer gradually clockwise (CW) to the desired position. See Fig. 35.

3.Replace the filter access panel. See Fig. 24. Ensure the fil- ter access panel slides along the tracks and is securely engaged.

4.Calculate the minimum airflow across the EconoMi$er.

a.Calculate % of outside air using the following formula.

% Outdoor air through EconoMi$er

Mixture Temp –

%Outdoor air = Return Air Temp Outdoor Temp –

Return Air Temp

b.Divide total CFM by percentage outdoor air, this gives outdoor air volume in CFM.

5.Turn on base unit power.

NOTE: The EconoMi$er begins operation three minutes after power up.

Personal Injury Hazard. Avoid possible injury by keep- ing fingers away from damper blades.

6. See Fig. 36 for barometric relief damper characteristics.

Fig. 35 — EconoMi$er Control Adjustment

Potentiometers (Factory Settings)

(IN.WG)

0.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.5

 

 

 

 

 

 

 

 

 

 

 

 

 

PRESSURE

0.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STATIC

0.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

800

1200

1600

2000

2400

 

0

400

FLOW (CUBIC FEET/MINUTE)

Fig. 36 — Barometric Relief Capacity

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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
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