48TF004-007 Single-Package Rooftop Heating/Cooling Units

Installation, Start-Up, and

Service Instructions

CONTENTS

Page SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION

1-35

Step 1

— Provide Unit Support

. . . 1

ROOF CURB

 

SLAB MOUNT

 

Step 2

— Field Fabricate Ductwork

. . . 2

Step 3

— Install External Trap for Condensate

 

 

Drain

. . . 2

Step 4

— Rig and Place Unit

. . . 2

POSITIONING

Step 5

— Install Flue Hood

4

Step 6

— Install Gas Piping

4

Step 7

— Make Electrical Connections

8

FIELD POWER SUPPLY

FIELD CONTROL WIRING

HEAT ANTICIPATOR SETTINGS

Step 8 — Make Outdoor-Air Adjustments

and Install Outdoor-Air Hood. . . . . . . . . . . . . . . . . . 11

MANUAL OUTDOOR-AIR DAMPER

OPTIONAL DURABLADE ECONOMIZER

OPTIONAL ECONOMI$ER

Step 9 — Adjust Evaporator-Fan Speed

19

DIRECT-DRIVE MOTORS

 

BELT-DRIVE MOTORS

 

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-38 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38-43 TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 44-49 START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . CL-1

Disconnect gas piping from unit when leak testing at pressure greater than 1/2 psig. Pressures greater than 1/2 psig will cause gas valve damage resulting in hazardous condition. If gas valve is subjected to pres- sure greater than 1/2 psig, it must be replaced before use. When pressure testing field-supplied gas piping at pressures of 1/2 psig or less, a unit connected to such piping must be isolated by manually closing the gas valve.

Before performing service or maintenance operations on unit, turn off main power switch to unit and install a lock- out tag. Electrical shock could cause personal injury.

INSTALLATION

Unit is shipped in the vertical duct configuration. To convert to horizontal configuration, remove screws from side duct opening covers and remove covers. Using the same screws, in- stall covers on vertical duct openings with the insulation-side down. Seals around duct openings must be tight. See Fig. 1.

Confirm before installation of unit that voltage, amperage and circuit protection requirements listed on unit data plate agree with power supply provided.

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 install, 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 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.

Step 1 — Provide Unit Support

ROOF CURB — Assemble and install accessory roof curb in accordance with instructions shipped with curb. See Fig. 2. In- stall insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb, not to the unit. The accessory thru-the-bottom power and gas connection package must be installed before the unit is set on the roof curb. If field- installed (thru-the-roof curb) gas connections are desired, use factory-supplied 3/4-in. pipe coupling and gas plate assembly to mount the thru-the-roof curb connection to the roof curb. Gas connections and power connections to the unit must be field in- stalled after the unit is installed on the roof curb.

If electric and control wiring is to be routed through the basepan, attach the accessory thru-the-bottom service connec- tions to the basepan in accordance with the accessory installa- tion instructions.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 2. Improperly applied gasket can result in air leaks and poor unit performance.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book

1

4

PC 111

Catalog No. 534-80000

Printed in U.S.A.

Form 48TF-1SI

Pg 1

8-00

Replaces: New

Tab

1a

6a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Carrier 48TF004-007 specifications Installation, Start-Up, Service Instructions

48TF004-007 specifications

The Carrier 48TF004-007 is part of the brand's renowned rooftop unit series, designed to deliver efficient, reliable performance for commercial applications. Ideal for spaces such as offices, retail stores, and small manufacturing facilities, these units encapsulate advanced technology to enhance indoor air quality and optimize climate control.

One of the standout features of the Carrier 48TF004-007 units is their variable speed compressor technology. This innovation not only allows for precise temperature control but also reduces energy consumption by modulating the compressor's speed according to the cooling or heating demand. By operating at lower speeds during less demanding conditions, these units significantly decrease energy usage compared to traditional single-speed compressors, contributing to lower utility bills and a reduced carbon footprint.

Energy efficiency is further enhanced with the inclusion of high-performance scroll compressors, which are known for their reliable operation and quiet performance. Coupled with an Energy Efficiency Ratio (EER) that meets or exceeds industry standards, these systems are designed to offer economical operation without sacrificing comfort.

Incorporating smart controls and connectivity features, the Carrier 48TF004-007 units allow for easy integration into building management systems (BMS). This enhances the ability to monitor and manage energy usage in real time, further promoting efficiency. The units are also compatible with various thermostat options, allowing for user-friendly operation and customization of settings.

Another significant characteristic of the Carrier 48TF004-007 is its durable construction. Built with galvanized steel and powder-coated finishes, these units are designed to withstand the rigors of outdoor installation, ensuring long-lasting performance even in harsh weather conditions. Additionally, the units come equipped with advanced filtration systems that help improve indoor air quality by effectively removing dust, allergens, and other particulate matter from the air.

Maintenance is simplified with the Carrier 48TF004-007, providing easy access to vital components, which supports reduced downtime and service costs. The units also feature low operating sound levels, making them suitable for noise-sensitive applications.

In conclusion, the Carrier 48TF004-007 rooftop units stand out for their energy efficiency, advanced technology, durability, and ease of maintenance, making them an excellent choice for any commercial space looking to enhance comfort while effectively managing operational costs.