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Carrier 48TM016-028 - User Manual

Carrier 48TM016-028
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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. 04-53480016-01 Printed in U.S.A. Form 48TM-4SI Pg 1 3-06 Replaces: 48TM-3SI
Book 1 4
Tab 1a 6a
Installation, Start-Up and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
........................1
INSTALLATION ..................................2-32
Step 1 — Provide Unit Support.....................2
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit .......................2
• POSITIONING
• ROOF MOUNT
Step 3 — Field Fabricate Ductwork
...............11
Step 4 — Make Unit Duct Connections ...........11
Step 5 — Install Flue Hood and Wind Baffle ......11
Step 6 — Trap Condensate Drain .................11
Step 7 — Orifice Change ..........................12
Step 8 — Install Gas Piping .......................13
Step 9 — Make Electrical Connections ...........13
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• OPTIONAL NON-FUSED DISCONNECT
• OPTIONAL CONVENIENCE OUTLET
Step 10 — Make Outdoor-Air Inlet
Adjustments
.....................................16
• MANUAL OUTDOOR-AIR DAMPER
Step 11 — Install Outdoor-Air Hood
..............16
Step 12 — Install All Accessories ...............17
• MOTORMASTER® I CONTROL INSTALLATION
• MOTORMASTER V CONTROL INSTALLATION
Step 13 — Adjust Factory-Installed Options .....19
• PREMIERLINK™ CONTROL
• ENTHALPY SWITCH/RECEIVER
• OUTDOOR ENTHALPY CONTROL
• DIFFERENTIAL ENTHALPY CONTROL
• OPTIONAL ECONOMI$ERIV AND ECONOMI$ER2
• ECONOMI$ERIV STANDARD SENSORS
• ECONOMI$ERIV CONTROL MODES
Step 14 — Install Humidistat for
Optional MoistureMi$er™ Package............31
START-UP .................................... 33-43
SERVICE ..................................... 43-50
TROUBLESHOOTING......................... 51-56
INDEX ...........................................57
START-UP CHECKLIST ........................CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should in-
stall, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters and replacing filters. All other
operations should be performed by trained service personnel.
When working on air-conditioning equipment, observe precau-
tions in the literature, tags and labels attached to the unit, and
other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
1. Improper installation, adjustment, alteration, service,
or maintenance can cause property damage, personal
injury, or loss of life. Refer to the User’s Information
Manual provided with this unit for more details.
2. Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any
phone in your building.
3. IMMEDIATELY call your gas supplier from a neigh-
bor’s phone. Follow the gas supplier’s instructions.
4. If you cannot reach your gas supplier, call the fire
department.
Disconnect gas piping from unit when pressure testing at
pressure greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in hazardous
condition. If gas valve is subjected to pressure greater than
0.5 psig, it must be replaced before use. When pressure
testing field-supplied gas piping at pressures of 0.5 psig or
less, a unit connected to such piping must be isolated by
closing the manual gas valve(s).
IMPORTANT: Units have high ambient operating limits. If
limits are exceeded, the units will automatically lock the
compressor out of operation. Manual reset will be required
to restart the compressor.
48TM016-028
Single-Package Rooftop Units
Electric Cooling/Gas Heating

Table of Contents

Questions and Answers

  • N
    Nicole ChavezAug 20, 2025
    Why is my Carrier Air Conditioner providing inadequate heating?
    • J
      Jack TerryAug 20, 2025
      If your Carrier Air Conditioner is providing inadequate heating, it could be due to: * A dirty air filter; clean or replace the filter as necessary. * Gas input to unit too low; check gas pressure at manifold. Clock gas meter for input. If too low, increase manifold pressure or replace with correct orifices. * Unit undersized for application; replace with proper unit or add additional unit. * Restricted airflow; clean filter, replace filter, or remove any restrictions. * Blower speed too low; install alternate motor, if applicable, or adjust pulley to increase fan speed. * Limit switch cycles main burners; check rotation of blower, thermostat heat anticipator settings, and temperature rise of unit. Adjust as needed. * Too much outdoor air; adjust minimum position.
  • Z
    zachary97Aug 22, 2025
    What to do if my Carrier 48TM016-028 compressor and condenser fan will not start?
    • P
      paula31Aug 22, 2025
      If the compressor and condenser fan of your Carrier Air Conditioner won't start, here's what might be happening: * There could be a power failure, in which case you should call the power company. * A fuse might have blown or a circuit breaker tripped; replace the fuse or reset the circuit breaker. * A component like the thermostat, contactor, transformer, or control relay could be defective, requiring replacement. * The line voltage might be insufficient; determine the cause and correct it. * The wiring could be incorrect or faulty; check the wiring diagram and rewire correctly. * The thermostat setting might be too high; lower the thermostat setting below room temperature.
  • K
    kathleenkramerAug 25, 2025
    Why does my Carrier Air Conditioner compressor operate continuously?
    • T
      Teresa PorterAug 25, 2025
      If your Carrier Air Conditioner's compressor operates continuously, it could be due to several reasons: * The air filter might be dirty; replace it. * The unit might be undersized for the load; decrease the load or increase the unit size. * The thermostat might be set too low; reset it. * There might be a low refrigerant charge; locate the leak, repair it, and recharge the system. * There could be air in the system; recover the refrigerant, evacuate the system, and recharge it. * The condenser coil could be dirty or restricted; clean the coil or remove the restriction.
  • S
    Steven EstesAug 26, 2025
    What to do if Carrier Air Conditioner compressor will not start but condenser fan runs?
    • C
      Christopher CaseAug 27, 2025
      If the compressor in your Carrier Air Conditioner won't start but the condenser fan runs, it could be due to: * Faulty wiring or loose connections in the compressor circuit; check the wiring and repair or replace as needed. * The compressor motor being burned out, seized, or having an internal overload open; determine the cause and replace the compressor. * A defective overload; determine the cause and replace it. * The compressor being locked out; determine the cause for the safety trip and reset the lockout. * One leg of 3-phase power being dead; replace the fuse or reset the circuit breaker and determine the cause.
  • J
    John ByrdAug 27, 2025
    Why is there excessive head pressure in my Carrier Air Conditioner?
    • J
      Jason GrantAug 28, 2025
      Excessive head pressure in your Carrier Air Conditioner can arise from: * A dirty air filter; replace it. * A dirty condenser coil; clean the coil. * An overcharged refrigerant level; recover the excess refrigerant. * A faulty TXV; check the TXV bulb mounting and secure it tightly to the suction line, or replace the TXV if it's stuck open or closed. * Air in the system; recover the refrigerant, evacuate the system, and recharge it. * Restricted condenser air or air short-cycling; determine the cause and correct it.
  • A
    Austin RossAug 29, 2025
    Why does my Carrier 48TM016-028 compressor cycle so often?
    • J
      John CarneyAug 30, 2025
      If the compressor in your Carrier Air Conditioner cycles more frequently than normal, it could be due to: * Refrigerant overcharge or undercharge; recover refrigerant, evacuate system, and recharge to nameplate. * Defective compressor; replace and determine cause. * Insufficient line voltage; determine cause and correct. * Blocked condenser; determine cause and correct. * Defective overload; determine cause and replace. * Defective thermostat; replace thermostat. * Faulty condenser-fan motor; replace it. * Restriction in refrigerant system; locate restriction and remove.
  • A
    April CastanedaSep 1, 2025
    Why is the suction pressure too low in my Carrier Air Conditioner?
    • R
      Rebecca EstradaSep 1, 2025
      If your Carrier Air Conditioner has low suction pressure, consider the following: * A dirty air filter; replace it. * Low refrigerant charge; check for leaks, repair, and recharge. * Metering device or low side restricted; remove source of restriction. * Faulty TXV; check TXV bulb mounting and secure tightly to suction line. Replace TXV if stuck open or closed. * Insufficient evaporator airflow; increase air quantity. Check filter and replace if necessary. * Temperature too low in conditioned area; reset thermostat. * Field-installed filter drier restricted; replace it.
  • D
    Dr. Nicole LewisSep 5, 2025
    What causes excessive suction pressure in my Carrier 48TM016-028 Air Conditioner?
    • D
      davistammySep 5, 2025
      If your Carrier Air Conditioner has excessive suction pressure, here's what could be happening: * High heat load; check for source and eliminate. * Faulty TXV; Check TXV bulb mounting and secure tightly to suction line. Replace TXV if stuck open or closed. * Refrigerant overcharged; recover excess refrigerant.
  • A
    Amanda BridgesSep 7, 2025
    What causes poor flame characteristics in Carrier Air Conditioner?
    • S
      Sheila StanleySep 7, 2025
      If your Carrier Air Conditioner has poor flame characteristics, it could be due to: * Incomplete combustion (lack of combustion air) results in aldehyde odors, CO, sooting flame, or floating flame; check all screws around flue outlets and burner compartment. Tighten as necessary. * Check vent for restriction; clean as necessary.
  • E
    eparkerSep 9, 2025
    Why is the head pressure too low in my Carrier 48TM016-028?
    • H
      Heather TurnerSep 9, 2025
      If the head pressure is too low in your Carrier Air Conditioner, it could be due to: * Low refrigerant charge; check for leaks, repair, and recharge. * Restriction in liquid tube; remove restriction.

Summary

SAFETY CONSIDERATIONS

General Safety Warnings

Contains warnings for installation, adjustment, alteration, service, and maintenance.

Gas Leak Emergency Procedure

Steps to take if you smell gas, including contacting the gas supplier.

Unit Operating Limits

Information on high ambient operating limits and automatic compressor lockout.

INSTALLATION

Provide Unit Support

Instructions for unit support, roof curb, and leveling.

Rig and Place Unit

Guidance on rigging, lifting, and positioning the unit correctly.

Field Fabricate Ductwork

Securing ducts, using flexible connectors, and insulating.

Make Unit Duct Connections

Connecting ductwork to the unit, including through-the-bottom connections.

Install Flue Hood and Wind Baffle

Securing the flue hood and wind baffle to the unit.

Trap Condensate Drain

Procedures for trapping the condensate drain with specific fittings.

Orifice Change

Adjusting orifices for natural gas and LP gas based on altitude.

Install Gas Piping

Guidelines for installing natural gas piping, including shutoff valve and sediment trap.

Make Electrical Connections

Procedures for field power supply and wiring.

Optional Non-Fused Disconnect

Instructions for installing the optional disconnect switch.

Optional Convenience Outlet

Information on installing a 115-v GFI convenience outlet.

Make Outdoor-Air Inlet Adjustments

Adjusting the manual outdoor-air damper for ventilation.

Install Outdoor-Air Hood

Assembling and installing the outdoor-air hood components.

Install All Accessories

General instruction to install all field-installed accessories.

Motormaster I Control Installation

Installing the Motormaster I control device.

Motormaster V Control Installation

Installing the Motormaster V control for fan speed adjustment.

Adjust Factory-Installed Options

Adjusting factory-installed options like PremierLink.

PremierLink Control

Installation and wiring of the PremierLink controller.

Enthalpy Switch;Receiver

Installing and wiring the enthalpy switch/receiver.

Outdoor Enthalpy Control

Logic for outdoor enthalpy control of the economizer.

Differential Enthalpy Control

Control logic for differential enthalpy using two sensors.

Indoor Air Quality (IAQ) Sensor Input

Using IAQ sensor for demand control ventilation based on CO2 levels.

Exhaust Set Point Adjustment

Adjusting the exhaust fan run time based on damper position.

Minimum Position Control

Setting minimum damper position for ventilation requirements.

Demand Controlled Ventilation (DCV)

Using EconoMi$erIV for demand controlled ventilation.

EconoMi$erIV Standard Sensors

Details on outdoor and supply air temperature sensors.

EconoMi$erIV Wiring

Wiring diagrams for EconoMi$erIV.

EconoMi$er2 Wiring

Wiring diagrams for EconoMi$er2.

EconoMi$erIV Control Modes

Discusses various control modes for EconoMi$erIV.

EconoMi$erIV Sensor Usage

Table detailing sensor requirements for different modes.

EconoMi$erIV Controller Potentiometer and LED Locations

Identifying controls and indicators on the EconoMi$erIV controller.

Outdoor Air Enthalpy Changeover

Control logic for outdoor enthalpy changeover.

Install Humidistat for Optional MoistureMi$er Package

Installing a humidistat for dehumidification control.

START-UP

Unit Preparation

Verifying unit installation and code compliance before start-up.

Compressor Rotation

Checking compressor rotation direction for proper operation.

Gas Heat Verification

Verifying gas pressures before turning on heat.

SERVICE

Cleaning Procedures

General cleaning instructions for unit components.

Lubrication

Lubrication requirements for fan shaft bearings.

Evaporator Fan Performance Adjustment

Adjusting evaporator fan speed for performance.

Refrigerant Charge

Procedures for charging the refrigerant system.

Gas Valve Adjustment

Steps to adjust the natural gas valve regulator.

Protective Devices

Information on compressor lockout and other protective devices.

TROUBLESHOOTING

EconoMi$erIV Troubleshooting

Procedures for troubleshooting the EconoMi$erIV control.

Cooling Service Analysis

Table of common cooling problems, causes, and remedies.

Heating Service Analysis

Table of common heating problems, causes, and remedies.

SERVICE TRAINING

Packaged Service Training

Information on available packaged service training programs.

Classroom Service Training

Information on hands-on classroom service training.

START-UP CHECKLIST

PRE-START-UP

Checklist of tasks to perform before unit start-up.

START-UP

Checklist items for electrical, temperatures, pressures, and general checks.

Carrier 48TM016-028 Specifications

General IconGeneral
BrandCarrier
Model48TM016-028
CategoryAir Conditioner
LanguageEnglish

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