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 TroubleshootingCONTENTS
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 TEMPERA TUR E,
CIRCUIT 1
• T4 — SATURATED CONDENSING TEMPERA TUR E,
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