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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 534-763 Printed in U.S.A. Form 48/50F,J-3T Pg 1 3-00 Replaces: 48/50F,J-1T
Book 1 1
Tab 1a 1b
Controls Operation,
and Troubleshooting
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . . . . 2
GENERAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Rooftop Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
VAV Control System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Processor Board
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
• 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
Supply Fan Variable Frequency Drive (VFD)
. . . . . 12
High Capacity Modulating Power
Exhaust Variable Frequency Drive
. . . . . . . . . . . . 12
Temperature Reset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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
Page
Control From Remote Building Management
System (BMS)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
• OCCUPIED/UNOCCUPIED
• 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
• SUPPLY FAN VARIABLE FREQUENCY DRIVE
• MODULATING POWER EXHAUST
START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-31
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) (48FK,JK and 50FK,JK Units)
. . . . . 30
High Capacity Power Exhaust
(48FM and 50FM,FS Units)
. . . . . . . . . . . . . . . . . . . . 30
START UNIT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31-34
Quick Test Program
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
OPERATING INFORMATION
. . . . . . . . . . . . . . . . . . 34-44
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 (48FK,JK and
50FK,JK Units Option or Accessory)
. . . . . . . . . . 38
High Capacity Modulating Power Exhaust
(48FM and 50FM,FS Units)
. . . . . . . . . . . . . . . . . . . . 38
Unit Staging
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
48FK,JK034-104
48FM078-104
50FK,FY,JK,JY034-104
50FM,FS078-104
Variable-Air Volume Rooftop Units