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. 534-80215 Printed in U.S.A. Form 48/50A-3T Pg 144 4-05 Replaces: 48/50A-2T
Copyright 2005 Carrier Corporation
Book 1 1
Tab 1a 1b
INDEX
Accessory control components 105
Accessory installation 7
Accessory Navigator™ display 4, 107
Airflow control during
fire-smoke modes 56
Alarm output 24
Alarms and alerts 78
Alert limit configuration 60
Auto view of run status 75
Basic control usage 3-6
Building pressure configuration 54
Building pressure control 54
Carrier Comfort Network (CCN) 59
CCN tables and display 5
CCN tables 121-133
Cleaning 109
ComfortLink™ control 3
Complete unit stoppage 66
Compressor run hours display table 76
Compressor starts display table 76
Condenser-fan adjustment 112
Controls 7
Controls operation 4, 26-64
Controls quick start 21-23
Controls set point and configuration
log CL-1 to CL-4
Conventions used in this manual 5
Cool mode selection process 33
Cooling 24
Cooling control 30
Cooling mode diagnostic help 37
Crankcase heaters 7
Demand controlled ventilation control 25
Demand limit control 25, 39
Dirty filter switch 50
Discrete switch logic configuration 62
Display configuration 62
Economizer 50
Economizer diagnostic help 53
Economizer integration with
mechanical cooling 41
Economizer operation 51
Economizer options 22
Economizer run status 75
Evacuation mode 56
Evaporator fan 7, 110-112
Exhaust options 22
Factory-installed components 85
Fan status monitoring 50
Fans 24
Filter drier 113
Fire shutdown mode 56
Fire-smoke inputs 56
Four-inch filter replacement 112
Forcing inputs and outputs 75
Gas heat (48A only) 7
Gas valve adjustment (48A only) 113
Generics table 5
Head pressure control 40
Heat mode diagnostic help 43
Heat mode selection process 42
Heating 24
Heating control 41
Hot gas bypass 63
HVAC modes 27
Independent outputs 24
Indoor air quality control 56
Indoor air quality options 22
Internal wiring 7
Local display tables 114-121
Lubrication 110
Main burners 113
Major system components 85-108
Mode trip helper 76
Modes 26
Multi-stage constant volume units with
mechanical thermostat 22
Multi-stage constant volume units
with space sensor 22
Power failure 112
Pressurization mode 56
Programming operating schedules 23
Refrigerant charge 112
Remote control switch input 63
Remote switch 24
Replacement parts 113
Restart procedure 66
Run status menu 75
Safety considerations 2
Scrolling Marquee 3, 103
Sensor trim configuration 61
Service 109-113
Service access 109
Service analysis 66
Service test 23, 24
Service test mode logic 23
Set clock on VFD (if installed) 22
Single circuit stoppage 66
Smoke control modes 56
Smoke purge mode 56
Software version numbers
display table 77
Space temperature offset 64
Staged gas heating control 46
Start up 7-20
Static pressure control 47
Static pressure reset 48
SumZ cooling algoritm 37
Supply air reset 25
Supply fan status monitoring logic 50
System modes 26
System pilot 4
Temperature compensated start 59
Temperature compensated start logic 59
Thermistor troubleshooting 66
Thermostat 24
Thermostatic expansion valve (TXV) 113
Third party control 24-26
Time clock configuration 64, 65
Transducer troubleshooting 66
Troubleshooting 66-85
Two-stage constant volume units
with mechanical thermostat 21
Two-stage constant volume units
with space sensor 21
Unit Configuration submenu 29
Unit preparation 7
Unit setup 7
Unit staging tables 36, 37
Unit start-up checklist CL-5
Unoccupied economizer free cooling 52
Variable air volume units using return
air sensor or space temperature sensor 21
VFD control 25
VFD information 134-142