York DJ150 Electric Heating Sequence of Operations, Electric Heating Operation Errors

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035-19046-002-B-0104

RESET

Remove the call for cooling, by raising thermostat setting higher than the conditioned space temperature. This resets any pressure or freezestat flash codes.

ELECTRIC HEATING SEQUENCE OF OPERATIONS

The following sequence describes the operation of the elec- tric heat section.

Two-stage heating:

a.Upon a call for first stage heat by the thermostat, the heater relay (RA) will be energized. After completing the specified fan on delay for heating, the UCB will energize the blower motor. If the second stage of heat is required, heater relay (RB) will be energized. After completing the specified fan on delay for heat- ing, the UCB will energize the blower motor.

b.The thermostat will cycle the electric heat to satisfy the heating requirements of the conditioned space.

ELECTRIC HEATING OPERATION ERRORS

TEMPERATURE LIMIT

If the UCB senses zero volts from the high temperature limit, the indoor blower motor is immediately energized.

This limit is monitored regardless of unit operation status, i.e. the limit is monitored at all times.

If the temperature limit opens three times within one hour, it will lock-on the indoor blower motor and a flash code is initi- ated (See Table 28).

SAFETY CONTROLS

The UCB monitors the temperature limit switch of electric heat units.

The control circuit includes the following safety controls:

LIMIT SWITCH (LS)

This control is located inside the heater compartment and is set to open at the temperature indicated in the Electric Heat Limit Setting Table 22. It resets automatically. The limit switch operates when a high temperature condition, caused by inad- equate supply air flow occurs, thus shutting down the heater and energizing the blower.

TABLE 22: ELECTRIC HEAT LIMIT SETTING

 

 

HEATER

LIMIT

UNIT (TONS)

VOLTAGE

SWITCH

kW

 

 

OPENS °F

 

 

 

 

 

 

 

12.5

 

18

150

 

 

 

 

12.5

208/230

24

150

 

 

 

12.5

34

150

 

 

 

 

 

12.5

 

54

150

 

 

 

 

12.5

 

18

150

 

 

 

 

12.5

480

24

150

 

 

 

12.5

34

150

 

 

 

 

 

12.5

 

54

150

 

 

 

 

12.5

 

18

150

 

 

 

 

12.5

600

24

150

 

 

 

12.5

34

150

 

 

 

 

 

12.5

 

54

150

 

 

 

 

FLASH CODES

The UCB will initiate a flash code associated with errors within the system. Refer to UNIT CONTROL BOARD FLASH CODES Table 28.

RESET

Remove the call for heating by lowering the thermostat set- ting lower than the conditioned space temperature.This resets any flash codes.

ELECTRIC HEAT ANTICIPATOR SETPOINTS

It is important that the anticipator setpoint be correct. Too high of a setting will result in longer heat cycles and a greater temperature swing in the conditioned space. Reducing the value below the correct setpoint will give shorter “ON” cycles and may result in the lowering of the temperature within the conditioned space. Refer to Table 23 for the required electric heat anticipator setting.

TABLE 23: ELECTRIC HEAT ANTICIPATOR SETPOINTS

 

SETTING, AMPS

 

 

 

W1

 

W2

 

 

 

0.13

 

0.1

 

 

 

36

Unitary Products Group

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Contents Installation Manual Table of Contents List of Figures List of TablesSafety Considerations GeneralInspection Reference ApprovalsRenewal Parts 12½ Ton Predator Model Number Nomenclature 150 N15 NomenclatureNOMENCLATURE, Additional Options Installation Installation Safety InformationPreceding Installation Compressor Section LimitationsPREDATOR Magnum Component Location Unit Temperature Limitations Unit Voltage LimitationsRigging and Handling LocationUnit Weights Point Load WeightClearances Unit Dimensions Detail CBottom Duct Openings from Above Rear Duct Dimensions Ductwork Duct CoversPREDATOR Magnum Roof Curb Dimensions Thermostat Wiring Control Wire SizesPower and Control Wiring FiltersPower Wiring Detail Electronic Thermostat Field WiringField Wiring 24 Volt Thermostat Contactor 1M Factory or Field Ground MCA Physical Data Optional Electric HeatMinimum Supply AIR CFM Optional GAS Heat GAS Heat Application DataGAS Piping GAS Connection LP UNITS, Tanks and PipingFactory Installed Options Field Installed Accessories Minimum Position Adjustment Enthalpy SET Point AdjustmentIndoor AIR Quality AQ Enthalpy SET Point Chart Phasing Blower RotationSupply AIR Limitations Belt TensionTurns Open ESP‡ CFM BHP Blower performance includes dry coil and two-inch Indoor Blower Specifications AIR BalanceChecking AIR Quantity Method ONEDRY Coil Delta P Supply AIR Drive Adjustment Operation Additional Static ResistanceMotor Sheave Datum Diameters Cooling Sequence of OperationEconomizer Single or Dual with Power Exhaust Cooling Operation ErrorsHIGH-PRESSURE Limit Switch No Outdoor AIR OptionsSafety Controls Compressor ProtectionElectric Heating Operation Errors Electric Heat Limit SettingElectric Heating Sequence of Operations Electric Heat Anticipator SetpointsGAS Heating Operation Errors GAS Heating Sequence of OperationsIgnition Control Board GAS Heat Limit Control Settings START-UP Cooling START-UP GAS HeatPost Start Checklist Manifold GAS Pressure AdjustmentShut Down Checking GAS InputGAS Rate Cubic Feet PER Hour Adjustment of Temperature Rise BURNERS/ORIFICES INSPECTION/SERVICINGTroubleshooting Charging the UnitPREDATOR Magnum Flash Codes Unit Control Board Flash CodesBasic Troubleshooting Flowchart Trip Failure Flow Chart Cooling Troubleshooting Guide Unitary Products Group 035-19046-002-B-0104 GAS Heat Troubleshooting Guide Unitary Products Group 035-19046-002-B-0104 Unitary Products Group Unitary 5005 Norman Products York Group Drive 73069

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