Carrier 50FK, JK034-074, 48FK specifications Start Unit

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START UNIT

To start unit:

1.Close the unit-mounted ON/OFF switch (located in the main control box).

2.Close the ®eld-supplied and -installed timeclock (or con- trol) switch (contacts located at Terminals 1 and 2 (TB3 for 034-048, TB4 for 054-104).

IMPORTANT: The ®eld-supplied and installed switch (or timeclock) MUST BE CLOSED to put unit in Occupied mode. Unit WILL NOT START until this is accomplished.

3.Initialization mode begins (see Operating Information sec- tion on page 34 for complete description of sequences and display codes).

4.Run Quick Test. If the display button is pressed during the initialization mode period, the unit will run its self-

diagnostic routine. When this is in effect, an 88 will ap-

pear in the display screen. Refer to Quick Test Program section below, for instructions on completing the Quick Test program.

Quick Test Program Ð Turn on power to unit.

IMPORTANT: The ®eld-supplied switch (or time- clock) must be closed to put unit into the occupied mode.

The quick test program utilizes the 2-digit LED display (see Fig. 6) on the set point board to show status of all input and output signals to microprocessor. Display action and quick test procedures are described below.

The quick test program is a 33-step program that provides a means of checking all input and output signals of controls prior to unit start-up. This check ensures that all control op- tions, thermistors, and control switches are in proper work- ing order.

When unit control circuit is switched to Occupied mode,

a20 will appear on the display. Immediately press display button once. An 88 will appear on the display and alarm

light on display board will be energized. This indicates that control system is ready to run quick test program.

IMPORTANT: Do not allow unit control circuit to

remain energized with 20 showing on display for more

than 2 minutes. If display button is not pressed within this time period, control will attempt to start unit.

For each step of the 33-step program, display button must be pressed twice. On ®rst press, step number is displayed; second press initiates required action and appropriate code is displayed.

NOTE: The step number is a numeral followed by a decimal point (a 2-digit number has a decimal point after each nu- meral). The action code number is one or 2 digits with no decimal point(s).

IMPORTANT: Once quick test is initiated, display but- ton must be pressed at least once every 10 minutes for control to remain in quick test mode. If button is not pressed within this time, control will attempt to start the unit.

To recheck any step in quick test program, control must be recycled by turning unit control switch off for a few sec- onds, and then turning it back on again. Restart quick test program as described above and proceed through quick test steps. Press display button twice for each step until step to be rechecked is reached.

The quick test program is divided into 3 sections as de- scribed below and shown in Tables 15-17.

1.Quick Test Steps 1.-1.3. Ð Unit Con®guration and Switch Check

The microprocessor in unit control system is programmed by 2 switch assemblies located on processor board (Fig. 1). The con®guration header is factory set and can- not be changed in the ®eld. The DIP switch assembly con- tains 8 microswitches that must be set in accordance with the various options selected by the customer. All DIP switches should be checked and set to proper position for options selected prior to the quick test. See Con®guration of Header and DIP Switch Assembly section on page 5 for factory switch settings. The DIP switch functions and display codes are shown in Table 15.

2.Quick Test Steps 1.4.-2.3. Ð Thermistor and Set Point Potentiometer Check

In these steps, the microprocessor checks resistance val- ues of all sensors and set point potentiometers to ensure that they are functional, connected properly, and set within proper range for unit con®guration.

Nominal resistance values for all sensors range from 363,000 to 219 ohms in accordance with Table 18. Normal dis- play code for good sensors and potentiometers is 1. A dis- play code of 0 indicates a faulty potentiometer, thermistor or wiring. A 0 display also indicates that option is not being used.

Table 16 shows thermistor and set point potentiometer functions and quick test display codes.

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Contents Contents Controls Operation TroubleshootingGeneral Safety ConsiderationsEXV Pin Terminal Connector J1 Thermistor InputsConnector J1 Temperature Unit Size Terminal no Input DIPRNT Ð Return Status Switch InputsConnector J2 Status Switch Unit Size Terminal no 034-104Page IFC Output Pin and Terminal AssignmentsOutput PIN Name Rating Device Terminal HIRCompressor Operation Thermistor T1 Location, 50FK,JK034-048 Units Thermistor T1 Location, 50FK,JK054-074 Units Thermistor T2 Location, Size 034-048 Units Thermistor T3 and T4 Locations, Size 054-104 Units Input Integrated CircuitSpace Temperature Reset Controls InstallationUnit Control Box Arrangement, Sizes Unit Control Box Arrangement, Sizes Unit Control Box Arrangement, Sizes 088 Thermistor Resistance Voltage Drop CharacteristicsSpace Temperature Sensor Averaging Single-Step Demand Limit MSP = Sasp + Remote Sasp Wiring Smoke Control Modes Smoke Control Switches Required for Each ModeTubing Size Switch FunctionsSwitch DPS Ð Differential Pressure SwitchTerminal Block START-UP Modulating Power Exhaust Differential Pressure Switch SizesPotentiometer Inputs and Ranges Conguration Header DIP Switch Factory SettingsConguration Header Jumpers Switch Function Meaning Position DIP SwitchesInlet Guide Vane Motor 50FK,JK034-074 Units Variable Frequency Drive Keypad Jumper Removal to Disable MotorPressure VFD Set Point Frequency Command for Duct PressureChanging the VFD Set Point Frequency Command Control Signal Pressure VFD SET PointStart Unit Quick Normal Description Control Switch Test Display Step no Quick Test, Unit Conguration and Switch CheckQuick Normal Test Description Relay Number Quick Test, Thermistor and Potentiometer CheckQuick Test, Output Relay Check Quick Normal Description Thermistor or TestSensor Resistance Values Operating InformationPage Component Arrangement, 034-048 Units Component Arrangement, 054-104 Units Page Modulating Power Exhaust Component Locations Sizes Modulating Power Exhaust Component Locations Sizes Page Compressor Loading and Unloading Sequences Cooling Size 104 Units Cooling Size 054 UnitsCooling Size 064 Units Cooling Size 088 UnitsOperation Status Codes TroubleshootingControls Troubleshooting Symptoms Probable Causes SolutionsDiagnostic Codes Codes 71 to 76 THERMISTOR/RESISTOR Failure Page TP6 Terminals Voltage ACTest PIN Voltage DC TP3 TP4PIN Terminal Voltage DC Quick Test J9 PIN Numbers Step noPIN Voltage Terminal Pin Terminal Connector J1 VoltagesPin Terminal Connector J2 Voltages Terminal Strip J6 Connection Resistance ReadingEnthalpy Sensor Checkout Terminal Strip J5 Connector Resistance ReadingQuick Test J5 PIN Numbers Step no Variable Frequency Drive Parameter Group Default Value Carrier Default Program Parameter ValuesMotor Overload Settings Required User Adjusted DefaultsMTR ALMLAT LPSPage Page Call for Free Catalog Service TrainingPRE-START-UP II. Preliminary Checklist ItemsIV. Notes III. START-UP
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