Carrier PC 111 - User Manual

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

Carrier PC 111 Specifications

Electrical

compressor amps L1	value not provided
compressor amps L2	value not provided
compressor amps L3	value not provided

Temperatures

outdoor-air temperature F DB	value not provided
return-air temperature F DB	value not provided
cooling supply air F	value not provided

Pressures

gas inlet pressure in. WG (48 series units only)	value not provided
gas manifold pressure stage no. 1 in. WG	value not provided
gas manifold pressure stage no. 2 in. WG	value not provided

Summary

Safety Considerations

Rooftop Information

Provides an overview of rooftop unit controls and their functions.

VAV Control System

Explanation of the microprocessor-based electronic control system.

VAV Control System Components

Processor Board

Details the processor board, its connections, and functionality.

Relay Board

Describes the relay board, its functions, and connections.

Display Board

Explains the display board interface and its diagnostic capabilities.

Thermistors

Discusses thermistors used for temperature sensing in the system.

Compressor Operation

Accessory Board

Details the standard accessory board and its potentiometers.

Economizer

Supply Fan Variable Frequency Drive (VFD)

Explains VFD control for supply fan static pressure.

High Capacity Modulating Power Exhaust Variable Frequency Drive

Covers VFD control for power exhaust fan.

Temperature Reset

Explains the accessory temperature reset function.

Controls Installation

Control Wiring

Details wiring requirements for unit control.

Space Temperature Reset

Installation

Instructions for installing the space temperature reset accessory.

Configuration

Configuration steps for space temperature reset.

Operating Sequence

Describes the operation of space temperature reset.

Demand Limit

Single-Step Demand Limit

How to implement single-step demand limiting.

Two-Step Demand Limit

How to implement two-step demand limiting.

Installation

Installation of demand limit controls.

Configuration

Configuration of demand limit controls.

Operating Sequence

Operational sequence for demand limiting.

Control From Remote Building Management System (BMS)

Smoke Control Modes

Air Pressure Tubing

Start-Up

Initial Check

Critical checks before unit start-up.

Potentiometer Inputs and Ranges

Configuration Header Jumpers

Details configuration header jumper settings.

DIP Switch Factory Settings

Explains DIP switch functions and factory settings.

Adjusting Set Points

Potentiometers

Explains how to set various operational potentiometers.

Supply Fan Control Options

Supply Fan Control with IGV Option

Details IGV control for supply fan static pressure.

Supply Fan Control with VFD Option

Details VFD control for supply fan static pressure.

Modulating Power Exhaust

High Capacity Modulating Power Exhaust (48 FM and 50 FM,FS Units)

Covers high-capacity modulating power exhaust system.

Unit Staging

Compressor Loading and Unloading Sequences

Details compressor staging and unloading sequences.

Troubleshooting

Checking Display Codes

How to view operational and diagnostic codes.

Complete Unit Stoppage

Potential causes for the unit being off.

Single Circuit Stoppage

Potential causes for a single circuit stoppage.

Diagnostic Codes

CODES 51, 52, 55, 56: COMPRESSOR FAILURE

Explains compressor failure codes and causes.

CODES 59 AND 60: LOW-PRESSURE SWITCH

Indicates low-pressure switch failure.

CODE 70: ILLEGAL UNIT CONFIGURATION

Error for improper unit configuration.

CODES 71 TO 76: THERMISTOR;RESISTOR FAILURE

Identifies thermistor or resistor failures.

CODE 81: RESET THERMISTOR OR POTENTIOMETER FAILURE

Failure of reset thermistor or potentiometer.

CODE 82: SUPPLY-AIR TEMPERATURE SET POINT POTENTIOMETER FAILURE

Failure of the supply-air set point potentiometer.

CODE 83: ECONOMIZER FEEDBACK POTENTIOMETER FAILURE

Failure of the economizer feedback potentiometer.

CODE 84: RESET LIMIT POTENTIOMETER FAILURE

Failure of the reset limit potentiometer.

CODE 85: DEMAND LIMIT POTENTIOMETER (P4) FAILURE

Failure of the demand limit potentiometer.

CODE 86: MINIMUM POSITION ECONOMIZER POTENTIOMETER FAILURE

Failure of the minimum economizer potentiometer.

CODE 87: WARM-UP TEMPERATURE SET POINT FAILURE

Failure of the warm-up temperature set point.

Processor Board Checkout

Step 1 - Check Transformer Input to the Board

Verifies transformer input voltage to the processor board.

Step 2 - Check Processor Board Power Supply

Checks the processor board's internal power supply.

Step 3 - Check Voltage Tolerance Circuitry

Tests voltage tolerance circuitry on the processor board.

Step 4 - Check Processor Reset Line

Verifies the processor reset line functionality.

Relay Board Troubleshooting

Step 1 - Low-voltage relay resistance check

Checks low-voltage relay resistance.

Step 2- High-voltage relay resistance check

Checks high-voltage relay resistance.

Enthalpy Sensor Checkout

Economizer Motor

Motor Test

Procedure for testing the economizer motor.

Standard Transducer Control

External Signal Control

Controlling VFD via external signal.

VFD Operation

Power Exhaust VFD Operation

Restoring Factory Power Exhaust VFD Defaults

Restoring factory default settings for PE VFD.