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Carrier WeatherMaker 48TC Series User Manual

Carrier WeatherMaker 48TC Series
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480288-01 Printed in U.S.A. Form 48TC-17-30-02SM Pg 1 10-2020 Replaces: 48TC-17-30-01SM
Service and Maintenance Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2
UNIT ARRANGEMENT AND ACCESS . . . . . . . . . . . . 3
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 3
Seasonal Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 3
SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . .
4
Supply Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 4
Adjustable-Pitch Pulley on Motor . . . . . . . . . . . . . . . 5
Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
STAGED AIR VOLUME (SAV) CONTROL: 2-SPEED
FAN WITH VARIABLE FREQUENCY
DRIVE (VFD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Staged Air Volume (SAV) Indoor Fan Speed
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Identifying Factory Option . . . . . . . . . . . . . . . . . . . . . 6
Unit Installation with SAV Option . . . . . . . . . . . . . . . 6
ADDITIO
NAL VFD INSTALLATION AND
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . 6
MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Replacing the Motor . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Changing Fan Wheel Speed by Changing Pulleys . 7
CONDENSER COIL SERVICE
. . . . . . . . . . . . . . . . . . . 7
Round Tube Plate Fin (RTPF) Condenser Coil . . . . . 7
EVAPORATOR COILS . . . . . . . . . . . . . . . . . . . . . . . . . 8
Coil Maintenance and Cleaning Recommendation . 9
Removing Surface Loaded Fibers . . . . . . . . . . . . . . . 9
Periodic Clean Water Rinse . . . . . . . . . . . . . . . . . . . . 9
Routine Cleaning of Evaporator Coil Surfaces . . . . 9
Evaporator Coil Metering Devices . . . . . . . . . . . . . . . 9
Refrigerant System Pressure Access Ports . . . . . . 10
HUMIDI-M
IZER® ADAPTIVE DEHUMIDIFICATION
SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Humidi-MiZer Modes . . . . . . . . . . . . . . . . . . . . . . . . . 11
THERM
OSTATIC EXPANSION VALVE (TXV) . . . . . 15
TXV Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Refrigerant System Pressure Access Ports . . . . . . 17
PURON® (R-410A) REFRIGERANT . . . . . . . . . . . . . 17
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Using the Cooling Charging Charts . . . . . . . . . . . . 17
COO
LING CHARGING CHARTS . . . . . . . . . . . . . . . . 18
COMPRESSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
TROUBLESHOOTING THE COOLING SYSTEM . . . 23
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . 24
N
on-Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Unit-Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Wet in Use Convenience Outlet Cover . . . . . . . . . . .24
GFCI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Fuse On Powered Type . . . . . . . . . . . . . . . . . . . . . . .25
Using Unit-Mounted Convenience Outlets . . . . . . .25
Installing a Weatherproof Cover . . . . . . . . . . . . . . . .25
SMO
KE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . .25
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . .26
FIOP Smoke Detector Wiring and Response . . . . .27
Sensor and Controller Tests . . . . . . . . . . . . . . . . . . .28
Detector Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . .29
INDICATO
RS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Normal State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Alarm State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Resetting Alarm and Trouble Condition Trips . . . .31
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
PROTECTIVE DEVICES
. . . . . . . . . . . . . . . . . . . . . . .31
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . .31
Control Circuit, 24v . . . . . . . . . . . . . . . . . . . . . . . . . .32
Pr
emierLink™ Control . . . . . . . . . . . . . . . . . . . . . . . .32
RTU Open Control System . . . . . . . . . . . . . . . . . . . .32
GAS HEATING SYSTEM . . . . . . . . . . . . . . . . . . . . . .32
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Fuel Types and Pressures . . . . . . . . . . . . . . . . . . . .33
Flue Gas Passageways . . . . . . . . . . . . . . . . . . . . . . .33
Combustion-Air Blower . . . . . . . . . . . . . . . . . . . . . . .34
Burners and Igniters . . . . . . . . . . . . . . . . . . . . . . . . .34
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Burner Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Orifice Replacement . . . . . . . . . . . . . . . . . . . . . . . . .37
Troubleshooting Heating System . . . . . . . . . . . . . . .44
ECONOM
I$ER SYSTEMS . . . . . . . . . . . . . . . . . . . . . .46
EconoMi$er IV Standard Sensors . . . . . . . . . . . . . .50
EconoMi$er® X (Factory Option) . . . . . . . . . . . . . . .55
PRE-START-UP/START-UP . . . . . . . . . . . . . . . . . . . .69
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . .69
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Additional Installation/Inspection . . . . . . . . . . . . . .69
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Outdoor-Air Inlet Screens . . . . . . . . . . . . . . . . . . . . .70
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . .70
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . .70
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . .70
Cooling
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Main Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
WeatherMaker
®
48TC**17-30
Single Package Rooftop Unit
with Gas Heat/Electric Cooling
and Puron
®
(R-410A) Refrigerant

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Carrier WeatherMaker 48TC Series Specifications

General IconGeneral
BrandCarrier
ModelWeatherMaker 48TC Series
CategoryAir Conditioner
LanguageEnglish

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