Specifications

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 534-80206 Printed in U.S.A. Form 48/50A-2T Pg 1 1-04 Replaces: New
Book 1 1
Tab 1a 1b
Controls, Start-Up, Operation,
Service and Troubleshooting
CONTENTS
Page
SAFETY CONSIDERATIONS .......................2
GENERAL ...................................... 2-4
Configurable Features............................. 3
Constant Volume Features.........................3
Variable Air Volume (VAV) Features ................4
MAJOR SYSTEM COMPONENTS................ 4-28
General ...........................................4
Factory-Installed Components ..................... 4
MAIN BASE BOARD (MBB)
ECONOMIZER BOARD (ECB1)
VAV B O A R D ( E C B 2 )
STAGED GAS HEAT BOARD (SCB)
CONTROL EXPANSION MODULE (CEM)
INTEGRATED GAS CONTROL (IGC)
COMPRESSOR PROTECTION BOARD (CS)
SCROLLING MARQUEE
SUPPLY FAN
VARIABLE FREQUENCY DRIVE (VFD)
POWER EXHAUST
ECONOMIZER MOTOR
THERMISTORS AND PRESSURE TRANSDUCERS
SMOKE DETECTOR
FILTER STATUS SWITCH
RETURN AIR CO
2
SENSOR
BOARD ADDRESSES
FIELD CONNECTION TERMINAL STRIPS
Accessory Control Components ..................23
ROOM THERMOSTATS
SPACE SENSOR
SPACE CO
2
SENSORS
ECONOMIZER HUMIDITY CHANGEOVER SENSORS
MOTORMASTER® V CONTROL
ACCESSORY NAVIGATOR
CONTROL MODULE COMMUNICATIONS
CARRIER COMFORT NETWORK INTERFACE
CONTROL FUNCTIONS
........................ 29-86
Overview ........................................29
Common VAV and CV Standard Features..........29
VAV Only Standard Features ......................29
Scrolling Marquee Display Operation .............30
CCN Tables and Display ..........................30
Modes ...........................................59
SYSTEM MODE — OFF
SYSTEM MODE — TEST
SYSTEM MODE — RUN
HVAC MODE
General Heating and Cooling Run Control
.........60
Stage Control ....................................63
Compressor Safeties .............................66
Time Delay Safety Limits .........................66
Demand Limiting .................................66
Head Pressure Control ...........................67
Heating Control ..................................67
Staged Gas Heat .................................67
IGC Control Logic ................................68
Page
Economizer......................................70
IAQ Control ...................................... 73
Pre-Occupancy Purge ............................75
Static Pressure Control...........................75
Static Pressure Reset ............................76
Building Pressure Control ........................77
Space Temperature Offset ........................78
Temperature Compensated Start.................. 78
Smoke Control Modes ............................ 78
Fan Status Monitoring............................79
Dirty Filter Switch ................................79
Remote Control Switch Input .....................79
Control Level Forcing ............................79
Test Mode ....................................... 79
Alarms and Alerts................................79
QUICK SETUP ................................ 86-88
Two-Stage Constant Volume Units with
Mechanical Thermostat ........................86
Two-Stage Constant Volume Units with
Space Sensor..................................86
Variable Air Volume Units Using
Return Air Sensor..............................86
Variable Air Volume Units Using
Space Temperature Sensor .....................86
Multi-Stage Constant Volume Units with
Mechanical Thermostat ........................87
Multi-Stage Constant Volume Units with
Space Sensor..................................87
Economizer Options .............................87
Exhaust Options ................................. 87
OPERATION .................................. 88-90
Cooling, Constant Volume Units ..................88
Variable Air Volume Control ...................... 88
Gas Heat Units (48A) .............................89
CCN Network System ............................89
Digital Air Volume (DAV) Linkage ................. 90
START-UP ................................... 90-103
SERVICE.................................... 104-108
Service Access .................................104
Cleaning........................................104
Lubrication .....................................104
Evaporator Fan Performance Adjustment ........104
Evaporator Fan Coupling Assembly..............106
Evaporator Fan Service and Replacement ........106
Belt Tension Adjustment ........................106
Evaporator-Fan Motor Replacement..............106
Condenser-Fan Adjustment .....................106
Power Failure ...................................106
Refrigerant Charge..............................106
Thermostatic Expansion Valve (TXV).............107
Gas Valve Adjustment ...........................107
Main Burners ...................................107
Filter Drier ......................................107
Replacement Parts ..............................107
48/50A020-060
Single Package Large Rooftop Units
with Scroll Compressors
and
Comfort
Link™ Version 2.X Controls

Summary of content (150 pages)