Carrier 48FK, Controls Operation And Troubleshooting

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Controls Operation,
and Troubleshooting
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . . . 2
GENERAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Rooftop Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
VAV Control System
. . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Processor Board
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
•
P1 — SUPPLY-AIR SET POINT
•
P2 — ECONOMIZER POSITION
•
P3 — RESET LIMIT
•
P4 — DEMAND LIMIT
•
P5 — ECONOMIZER MINIMUM POSITION
•
P6 — WARM-UP SET POINT
•
P7 — SASP RESET TEMPERATURE
•
PROCESSOR BOARD OUTPUTS
•
CONFIGURATION HEADER AND DIP SWITCH
ASSEMBLY
Relay Board
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Display Board
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Thermistors
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
•
T1 — SUPPLY-AIR TEMPERATURE THERMISTOR
•
T2 — RETURN-AIR TEMPERATURE THERMISTOR
•
T3 — SATURATED CONDENSING TEMPERATURE,
CIRCUIT 1
•
T4 — SATURATED CONDENSING TEMPERATURE,
CIRCUIT 2
•
T10 — RESET TEMPERATURE
Compressor Operation
. . . . . . . . . . . . . . . . . . . . . . . . . 7
•
CONTROL RELAY (CR)
Accessory Board
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
•
P3 — RESET LIMIT
•
P5 — ECONOMIZER MINIMUM POSITION
•
P6 — MORNING WARM-UP TEMPERATURE
Single-Step Demand Unit . . . . . . . . . . . . . . . . . . . . . . . 7
Demand Limit Control Module (DLCM) . . . . . . . . . . . . 7
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
•
ENTHALPY CONTROL
•
DIFFERENTIAL ENTHALPY
Variable Frequency Drive (VFD) . . . . . . . . . . . . . . . . . 12
Temperature Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
CONTROLS INSTALLATION
. . . . . . . . . . . . . . . . . . . 13-25
Control Wiring
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
•
NIGHT SETBACK THERMOSTAT
•
SPACE TEMPERATURE RESET ACCESSORY
(50DJ900021)
Space Temperature Reset
. . . . . . . . . . . . . . . . . . . . . . 13
•
INSTALLATION
•
CONFIGURATION
•
OPERATING SEQUENCE
Demand Limit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
•
SINGLE-STEP DEMAND LIMIT
•
TWO-STEP DEMAND LIMIT
•
INSTALLATION
•
CONFIGURATION
•
OPERATING SEQUENCE
Control From Remote Building Management
System (BMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
•
OCCUPIED/UNOCCUPIED
Page
•
NIGHT SETBACK CONTROL
•
UNIT SUPPLY AIR SET POINT ADJUSTMENT
•
DEMAND UNIT (1-STAGE OR 2-STAGE)
•
SUPPLY DUCT PRESSURE SET POINT ADJUSTMENT
•
EXTERNAL ALARM SIGNAL
•
REMOTE ECONOMIZER CONTROL
Smoke Control Modes
. . . . . . . . . . . . . . . . . . . . . . . . . 21
•
FIRE SHUTDOWN MODE
•
PRESSURIZATION MODE
•
EVACUATION MODE
•
SMOKE PURGE MODE
•
INSTALLATION
•
CONFIGURATION
•
OPERATING SEQUENCE
Air Pressure Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
•
INLET GUIDE VANES
•
VARIABLE FREQUENCY DRIVE
•
MODULATING POWER EXHAUST
START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-30
Initial Check
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Configuration Header
. . . . . . . . . . . . . . . . . . . . . . . . . 26
DIP Switches
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Adjusting Set Points
. . . . . . . . . . . . . . . . . . . . . . . . . . 27
Potentiometers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Supply Fan Control with IGV Option
. . . . . . . . . . . . . 28
Supply Fan Control with VFD Option
. . . . . . . . . . . . 28
Modulating Power Exhaust
(Option or Accessory) . . . . . . . . . . . . . . . . . . . . . . . 30
START UNIT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31-34
Quick Test Program . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
OPERATING INFORMATION . . . . . . . . . . . . . . . . . . . 34-43
Digital Display
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
•
CODES 0 THROUGH 8, CAPACITY STEPS
•
CODES 20 THROUGH 30 AND 88, OPERATIONAL
STATUS
•
CODES 51 THROUGH 87, DIAGNOSTIC
INFORMATION
Operating Sequence
. . . . . . . . . . . . . . . . . . . . . . . . . . 35
•
SIZE 034, 038 AND 048-088 UNITS
•
SIZE 044 UNITS
•
SIZE 104 UNITS
Head Pressure Control
. . . . . . . . . . . . . . . . . . . . . . . . 36
Supply Fan Control with IGV
. . . . . . . . . . . . . . . . . . . 38
Supply Fan Control with VFD
. . . . . . . . . . . . . . . . . . . 38
Modulating Power Exhaust (Option or
Accessory Except FY,JY Units)
. . . . . . . . . . . . . . . 38
Unit Staging
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . . . . . 44-57
Checking Display Codes . . . . . . . . . . . . . . . . . . . . . . . 44
Complete Unit Stoppage . . . . . . . . . . . . . . . . . . . . . . . 44
Single Circuit Stoppage . . . . . . . . . . . . . . . . . . . . . . . 44
Restart Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
•
CODES 51, 52, 55, 56: COMPRESSOR FAILURE
48FK,JK034-074
50FK,FY,JK,JY034-104
Variable-Air Volume Rooftop Units
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 1
Tab 1a 1b
PC 111 Catalog No. 534-716 Printed in U.S.A. Form 48/50F,J-1T Pg 1 4-99 Replaces: 48/50D,F,J-1T