Carrier 48HJD005-007 Heating Service Analysis, Durablade Economizer Service Analysis

Page 40

Table 31 — Heating Service Analysis

PROBLEM

CAUSE

REMEDY

Burners will not

Misaligned spark electrodes.

Check flame ignition and sensor electrode positioning. Adjust as

ignite.

 

needed.

 

No gas at main burners.

Check gas line for air purge as necessary. After purging gas line of

 

 

air, allow gas to dissipate for at least 5 minutes before attempting to

 

 

relight unit.

 

 

Check gas valve.

 

Water in gas line.

Drain water and install drip leg to trap water.

 

No power to furnace.

Check power supply, fuses, wiring, and circuit breaker.

 

No 24 v power supply to control circuit.

Check transformer. Transformers with internal overcurrent protection

 

 

require a cool-down period before resetting. Check 24-v circuit

 

 

breaker; reset if necessary.

 

Miswired or loose connections.

Check all wiring and wirenut connections.

 

Burned-out heat anticipator in thermostat.

Replace thermostat.

 

Broken thermostat wires.

Run continuity check. Replace wires, if necessary.

Inadequate heating.

Dirty air filter.

Clean or replace filter as necessary.

 

Gas input to unit too low.

Check gas pressure at manifold. Clock gas meter for input. If too low,

 

 

increase manifold pressure or replace with correct orifices.

 

Unit undersized for application.

Replace with proper unit or add additional unit.

 

Restricted airflow.

Clean filter, replace filter, or remove any restrictions.

 

Blower speed too low.

Use high speed tap, increase fan speed, or install optional blower, as

 

 

suitable for individual units, Adjust pulley.

 

Limit switch cycles main burners.

Check rotation of blower, thermostat heat anticipator settings, and

 

 

temperature rise of unit. Adjust as needed.

 

Too much outdoor air.

Adjust minimum position.

 

 

Check economizer operation.

Poor flame

Incomplete combustion (lack of

Check all screws around flue outlets and burner compartment.

characteristics.

combustion air) results in:

Tighten as necessary.

 

Aldehyde odors, CO (carbon monoxide),

Cracked heat exchanger.

 

sooting flame, or floating flame.

Overfired unit — reduce input, change orifices, or adjust gas line or

 

 

 

 

manifold pressure.

 

 

Check vent for restriction. Clean as necessary.

 

 

Check orifice to burner alignment.

Burners will not

Unit is locked into Heating mode for a

Wait until mandatory one minute time period has elapsed or reset

turn off.

one minute minimum.

power to unit.

Table 32 — Durablade Economizer Service Analysis

PROBLEM

CAUSE

 

REMEDY

Damper does not

Evaporator fan not on.

Check wiring between G on connection board and evaporator-fan

open.

 

contactor.

 

 

No power to economizer motor.

1.

Check that SW3 is making proper contact with the damper blade.

 

 

 

2.

Check continually across R1 coil. If not connect, replace relay R1.

 

 

 

3.

Check diode D18. If diode is not functioning properly, replace D18.

 

 

 

4.

Check wiring in economizer relay pack. (See unit label diagram.)

 

 

Economizer motor failure.

If there is 24 vac power at the motor terminals, but motor is not operat-

 

 

 

ing, replace motor.

Economizer

OAT or EC set too high.

1.

Set at correct temperature (3 F below indoor space temperature).

operation limited to

 

2.

Check OAT or EC by setting set point above outdoor temperature or

minimum position.

 

 

humidity level. If switch does not close, replace OAT or EC.

 

 

Check wiring of economizer relay packs.

1.

Check continuity across relay R2 coil. If not connected, replace R2

 

 

 

 

relay.

 

 

 

2.

Check continuity across relay R3 coil. If not connected, replace R3

 

 

 

 

relay.

 

 

Check SAT.

If supply-air temperature is over 57 F, switch T2 should be closed. If

 

 

 

not, replace SAT.

Damper does not

Incorrect wiring or wiring defects.

1.

Check switches 2 and 4. If non-operational, replace.

close.

 

2.

Check diode D19. If diode D19 is not functioning properly, replace.

 

 

 

3.

Check wiring on economizer and on economizer relay pack. (See

 

 

 

 

unit label diagram.)

 

 

Check SAT.

If supply-air thermostat is below 52 F, switch T1 should be closed. If

 

 

 

not, replace SAT.

 

 

Economizer motor failure.

If there is 24 vac power at motor terminals, but motor is not operating,

 

 

 

replace the motor.

LEGEND

 

 

 

EC — Enthalpy Control

 

 

OAT — Outdoor-Air Thermostat

 

 

SAT — Supply-Air Thermostat

 

 

SW — Switch

 

 

 

40

Page 39 Page 41
Image 40
Page 39 Page 41
Contents CONTENTS SAFETY CONSIDERATIONSINSTALLATION 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 1/2″ Fig. 5 - Base Unit Dimensions - 48HJ004-0073/4″ Step 8 - Adjust Factory-Installed Options Fig. 7 - Gas Piping Guide With AccessoryThru-the-Curb Service Connections Fig. 6 - Flue Hood DetailsFig. 10 - Field Control Wiring Raceway Fig. 8 - Power Wiring ConnectionsFig. 9 - Low-Voltage Connections With or Without Economizer age is greater than 2%. Use the following formula to determine Never operate a motor where a phase imbalance in supply voltthe 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. 13 - Typical Access Panel Locations Fig. 15 - Durablade Economizer Installed in UnitFig. 16 - Horizontal Durablade Economizer Installation Fig. 14 - Outdoor-Air Hood DetailsWiring Harness Fig. 19A - Durablade Economizer Damper Minimum Position SettingFig. 19B - Durablade Economizer Minimum Position Damper Setting Fig. 20 - Outdoor-Air Thermostat Enthalpy Control InstallationRelief Damper Characteristics Fig. 24 - Typical Access Panel LocationsFig. 25 - Exhaust Air Hood Assembly Fig. 22 - Durablade Economizer BarometricFig. 28 - Rear EconoMi$er Flange Installation Fig. 26 - Outdoor-Air Hood AssemblyFig. 27 - Completed Hood Assembly Fig. 29 - EconoMi$er InstalledFig. 31 - EconoMi$er Sensor Wiring Fig. 33 - Typical Access Panel LocationsFig. 32 - Wiring Diagram for Power Exhaust System POWER EXHAUST SYSTEM HIGH VOLTAGEFig. 34 - Supply-Air Sensor Placement Table 4 - Default Potentiometer SettingsFig. 35 - EconoMi$er Control Adjustment Potentiometers Factory SettingsFig. 38 - Evaporator-Fan Pulley Adjustment Step 9 - Adjust Evaporator-Fan Speed - AdFig. 37 - Belt-Drive Motor Mounting Table 6 - Evaporator-Fan Motor Data - Standard Motor Table 5A - 48HJ Fan Rpm at Motor Pulley Setting With Standard MotorTable 7 - Evaporator-Fan Motor Data - High-Static Motors Table 9 - Outdoor Sound Power Total Unit Table 8 - Motor Nominal HorsepowerBels 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 FIOP - Factory-Installed Option Table 26 - Economizer Static Pressure Drop in. wgTable 27 - FIOP MoistureMiser Dehumidification Package Static Pressure Drop in. wgPRE-START-UP START-UPOperating Sequence HeatingTable 28 - Altitude Compensation When the supply-air temperature falls between 57 F and Fig. 39 - MoistureMiser Option Operation SERVICE LubricationFig. 40 - Cleaning Condenser Coil Fig. 41 - Propping Up Top Panel Fig. 42 - Separating Coil SectionsFig. 44 - Cooling Charging Chart Standard 48HJ004 Fig. 43 - Condenser-Fan AdjustmentFig. 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 DetailsFig. 54 - Spark Gap Adjustment LOW HEAT 48HJE004, 48HJD005-007 - 72,000 BTUH INPUTMEDIUM AND HIGH HEAT 48HJE005-007, 48HJF004 - 115,000 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 33 - EconoMi$er Flash Code Identification Table 34 - EconoMi$er TroubleshootingCritical 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 START-UP CHECKLIST Remove and Store in Job File I. PRELIMINARY INFORMATIONII. PRE-START-UP insert checkmark in box as each item is completed III. START-UP
Top Page Image Contents