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Carrier 48/50PG Series - User Manual

Carrier 48/50PG Series
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48/50PG C03---28
48/50PM C16---28
Single P a ckage Roof top Units
With COMFOR TLinkt Controls V ersion 4.x
and PURONR (R---410A) Refrigerant
Cont ro ls , St art---Up, Operat io n, Service
and Tro uble s ho oting Ins t ructions
TABLE OF CONTENTS
Page
SAFETY CONSIDERATIONS 2.........................
GENERAL 3.........................................
BASIC CONTROL USAGE 3...........................
ComfortLinkt Control 3..............................
Scrolling Marquee 3..................................
Accessory Navigator Display 4..........................
Operation 4.........................................
System Pilott and Touch Pilot Devices 4.................
CCN T ables and Display 4.............................
Conventions Used in This Manual 6......................
START--UP 6.........................................
Unit Preparation 6....................................
Compressor Mounting 6...............................
Refrigerant Service Ports 6.............................
Crankcase Heater(s) 6.................................
Compressor Rotation 6................................
Power Supply 6.....................................
Internal Wiring 6.....................................
Evaporator Fan 6....................................
Subcooler Heat Exchanger (SHX) (48/50PG20--28 Only) 6....
Condenser Fans and Motors 8...........................
Return--Air Filters 8..................................
Outdoor-- Air Inlet Screens 8............................
Air Baffles 8........................................
Accessory Installation 8...............................
Orifice Change (48PG and 48PM) 8......................
Gas Heat (48PG and 48PM) 8..........................
CONTROLS QUICK SET--UP 8.........................
Control Set Point and Configuration Log 8................
Thermostat Control 8.................................
Space Temperature Sensor Control -- Direct Wired
(T-- 55 or T --56 or T--59) 9.............................
T--58 Communicating Room Sensor 9....................
CCN Linkage Control 9...............................
System Pilot -- Communication Space Sensor 9.............
Thermidistat Control 9................................
Space Humidistat Control 9............................
Relative Humidity Sensor Control 9......................
CCN Communication 9...............................
Accessories 9.......................................
Programming Operating Schedules 10....................
SERVICE TEST 12....................................
Independent Outputs 12...............................
Fan Test 12.........................................
Cooling Test 12.....................................
Humidi--MiZert Test 12..............................
Heating Test 13......................................
THIRD PARTY CONTROL 13..........................
Cool
ing/H
eating Control 13............................
Dehumidification Control 13...........................
Remote Occupancy 13................................
Fire Shutdown 13....................................
Alarm Output 13.....................................
Economizer Monitoring 14.............................
Economizer Damper Control 14.........................
CONTROLS OPERATION 14...........................
Display Configuration 14..............................
Unit Configuration 14.................................
Modes 15..........................................
General Operation 16.................................
Setpoint Determination 16.............................
Occupancy Determination 17...........................
Indoor Fan Operation 17...............................
Cooling Operation 18.................................
Heating Operation 21.................................
Economizer 23......................................
Optional Humidi--MiZert Dehumidification System 24......
Indoor Air Quality (IAQ) 30............................
Adaptive Fan 35.....................................
Temperature Compensated Start 36.......................
Carrier Comfort Network (CCN)R Configuration 36.........
Demand Limit 37....................................
Linkage 37.........................................
Alarm Handling 38...................................
Copyright 2009 Ca rrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 7/09
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No:48---50PGPM---02T
R e p l a c e s : 4 8 --- 5 0 P G P M --- 0 1 T

Table of Contents

Questions and Answers

  • L
    laurenwhiteAug 1, 2025
    Why is my Carrier Air Conditioner unit completely stopped?
    • M
      Martin AdkinsAug 1, 2025
      A complete stoppage of your Carrier Air Conditioner can occur for several reasons. It may be due to an active alarm, satisfied cooling and heating loads, the programmed occupancy schedule, a general power failure, tripped circuit breakers (CB1, CB2, or CB3), a blown fuse (FU1--4), the unit being turned off through the CCN network, the supply-air temperature being less than the Minimum SAT Lower Level configuration value, the outdoor-air temperature being less than the Compressor Lockout Temperature configuration value, or the outdoor-air temperature being greater than the Heating Lockout Temperature configuration value. If an alarm is active, diagnose the problem using the information provided in Alarms and Alerts section.
  • J
    Julian WalkerAug 5, 2025
    What does it mean when my Carrier 48/50PG displays Alarm Code A404 -- Fire Shutdown?
    • C
      Carl OdonnellAug 5, 2025
      Alarm code A404 on your Carrier Air Conditioner indicates a fire shutdown. This is caused by an auxiliary device, such as a smoke detector, attempting to shut down the unit. Verify that the configuration is set correctly, and check the wiring and auxiliary device.
  • T
    Todd HillAug 9, 2025
    Why does my Carrier 48/50PG have a Compressor Safety Trip?
    • J
      John FerrellAug 9, 2025
      A compressor safety trip in your Carrier Air Conditioner can be triggered by a high--pressure switch (HPS) opening, the compressor's internal protection activating, or a wiring error. These alerts reset automatically.
  • J
    Jennifer BentonAug 14, 2025
    How to fix Economizer Damper Actuator Out of Calibration on Carrier 48/50PG Air Conditioner?
    • B
      brenda81Aug 14, 2025
      To fix an economizer damper actuator that is out of calibration on your Carrier Air Conditioner, initiate economizer calibration (Service Test?INDP?E.CAL) using the Service Test menu. This issue is caused by a missing calibration step or a mechanical problem.
  • P
    Paul KellyAug 18, 2025
    What does Alert Code T073 mean on Carrier 48/50PG Air Conditioner?
    • S
      Samuel BarberAug 19, 2025
      Alert Code T073 on a Carrier Air Conditioner indicates an Outdoor Air Temperature Thermistor Failure. The cause may be a faulty thermistor, a shorted or open thermistor caused by a wiring error, or a loose connection.
  • P
    Paul RiceAug 22, 2025
    What to do if my Carrier 48/50PG Air Conditioner displays Circuit Saturated Suction Temperature Thermistor Failure?
    • C
      Crystal Dennis MDAug 22, 2025
      If your Carrier Air Conditioner displays 'Circuit Saturated Suction Temperature Thermistor Failure', it is due to a network force on a non exposed CCN point. Reload factory defaults or reinstall software on the MBB. Consult the network manager if alert continues.
  • E
    Eric WarrenAug 27, 2025
    What does Alert Code T408 Dirty Air Filter mean for Carrier 48/50PG?
    • V
      vickiandersonAug 27, 2025
      Alert Code T408 on your Carrier Air Conditioner signals a dirty air filter.

Carrier 48/50PG Series Specifications

General IconGeneral
BrandCarrier
Model48/50PG Series
CategoryAir Conditioner
LanguageEnglish

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