Carrier 48HJ015-025 installation instructions Contents, Safety Considerations, Installation

Page 1

48HJ015-025 Single Package Rooftop Units Electric Cooling/Gas Heating

Installation Instructions

CONTENTS

Page

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

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Step 1 Ð Provide Unit Support . . . . . . . . . . . . . . . 1

·ROOF CURB

·ALTERNATE UNIT SUPPORT

Step 2 Ð Rig and Place Unit . . . . . . . . . . . . . . . . . . 3

·POSITIONING

·ROOF MOUNT

Step 3 Ð Field Fabricate Ductwork . . . . . . . . . . . . 7 Step 4 Ð Make Unit Duct Connections . . . . . . . . 7 Step 5 Ð Install Flue Hood . . . . . . . . . . . . . . . . . . . 7 Step 6 Ð Trap Condensate Drain . . . . . . . . . . . . . 8 Step 7 Ð Install Gas Piping . . . . . . . . . . . . . . . . . . . 8 Step 8 Ð Make Electrical Connections . . . . . . . . 9

·FIELD POWER SUPPLY

·FIELD CONTROL WIRING

Step 9 Ð Make Outdoor-Air Inlet

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

·MANUAL OUTDOOR-AIR DAMPER

·OPTIONAL FACTORY-INSTALLED ECONOMIZER

Step 10 Ð Install Outdoor-Air Hood . . . . . . . . . . 10

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-17 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-27 START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1

1.Improper installation, adjustment, alteration, serv- ice, or maintenance can cause property damage, per- sonal injury, or loss of life. Refer to the User's In- formation Manual provided with this unit for more details.

2.Do not store or use gasoline or other ¯ammable va- pors 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 ®re department.

Disconnect gas piping from unit when pressure testing at pressure greater than 0.5 psig. Pressures greater than

0.5psig will cause gas valve damage resulting in haz- ardous condition. If gas valve is subjected to pressure greater than 0.5 psig, it must be replaced before use. When pressure testing ®eld-supplied gas piping at pressures of

0.5psig or less, a unit connected to such piping must be isolated by closing the manual gas valve(s).

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical com- ponents. Only trained and quali®ed service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform the basic maintenance functions of cleaning coils and ®lters and replacing ®lters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, ob- serve precautions 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 ®re ex- tinguishers 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.

INSTALLATION

Step 1 Ð Provide Unit Support

ROOF CURB Ð Assemble or install accessory roof curb in accordance with instructions shipped with this accessory. See Fig. 1 and 2. Install insulation, cant strips, roo®ng, and counter ¯ashing as shown. Ductwork can be installed to roof curb before unit is set in place. Curb should be level. This is nec- essary to permit unit drain to function properly. Unit level- ing tolerance is ± 1¤16 in. per linear ft in any direction. Refer to Accessory Roof Curb Installation Instructions for addi- tional information as required. When accessory roof curb is used, unit may be installed on class A, B, or C roof covering material.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket with the roof curb as shown in Fig. 1. Improperly applied gasket can also result in air leaks and poor unit performance.

Instructions continued on page 3.

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

Book

1

 

PC 111

Catalog No. 534-807

Printed in U.S.A.

Form 48HJ-9SI

Pg 1

2-95

Replaces: 48HJ-5SI

Tab

1a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Contents Safety Considerations ContentsInstallation ``A ``B ``C Accessory Curb DescriptionPackage no Height 50DP900211Unit Maximum Shipping Weight Dimension aUnit Physical Data Base Unit Dimensions, 48HJ015,017 Base Unit Dimensions, 48HJ025 Air Distribution Ð Through-the-Bottom 48HJ017 and 025 Shown Combustion Fan Housing Location Electrical Data Make Electrical ConnectionsEquip GNDUnit Voltage Unit Make Outdoor-Air Inlet Adjustments48HJD015 All 48HJD025, HJE015 HJE017 Economizer Motor Control Module Location START-UP Accessory Field-Installed Economizer AdjustAirflow Ð Fan Performance Data, 48HJ015, 208/230, 460-V UnitsFiop Ð Fan Performance Data, 48HJ015, 575-V Units Fan Performance Data, 48HJ017 Units Air Quantity Limits Fan Performance Data, 48HJ025 UnitsUnit 48HJ Minimum CFM Maximum CFM Base Unit Operation Accessory/FIOP Economizer Static Pressure in. wgUnit CFM Economizer Pressure DropLubrication ServiceEvaporator Fan, 48HJ017,025 Units Evaporator Fan, 48HJ015 UnitsManufacturer Lubricant Condenser-Fan Adjustment Belt Tension Adjustment Ð To adjust belt tensionHigh and Low Outdoor-Air Temperature Economizer Checkout ProceduresGas Valve Adjustment Pilot AdjustmentMain Burner Removal Protective DevicesTypical Wiring Schematic 48HJ025 Shown Typical Wiring Schematic 48HJ025 Shown Typical Component Arrangement 48HJ025 Shown IFM AHAIFR CLOPage Page Packaged Service Training Page PRE-START-UP START-UP Checklist

48HJ015-025 specifications

The Carrier 48HJ015-025 is a distinguished series of rooftop packaged units renowned for their efficient performance and reliability in light commercial applications. Designed for a variety of indoor environments, these units are engineered to provide efficient heating and cooling solutions, making them suitable for retail spaces, offices, and other commercial buildings.

One of the main features of the Carrier 48HJ series is its advanced scroll compressor technology, which enhances the overall efficiency of the systems. This type of compressor is known for its durability and quiet operation, providing consistent temperature control while minimizing energy consumption. The use of a scroll compressor contributes to a higher Seasonal Energy Efficiency Ratio (SEER) and Heating Seasonal Performance Factor (HSPF), making these units a smart choice for energy-conscious businesses.

Additionally, the 48HJ series incorporates a multi-speed indoor blower that allows for precise airflow control. This feature ensures optimal indoor comfort by adjusting the air distribution based on the specific heating or cooling needs of the space. The ability to adapt to varying load conditions enhances efficiency and reduces energy wastage.

Another noteworthy characteristic of the Carrier 48HJ015-025 is its robust construction. Built with galvanized steel, the units are designed to withstand harsh environmental conditions, ensuring longevity and minimal maintenance requirements. The powder-painted finish offers corrosion resistance, contributing to the unit’s durability over time.

The series also integrates advanced controls for ease of operation. The user-friendly thermostat enables precise temperature management and can be programmed according to the specific needs of the facility. Moreover, compatibility with Building Management Systems (BMS) facilitates seamless integration into existing infrastructure, enabling remote monitoring and enhanced operational efficiency.

In terms of environmental considerations, the Carrier 48HJ series utilizes R-410A refrigerant, which is known for its reduced impact on the ozone layer compared to older refrigerants. This commitment to sustainability aligns with modern environmental standards and regulations.

Overall, the Carrier 48HJ015-025 stands out as a versatile and efficient rooftop packaged unit, perfect for varying commercial applications. Its combination of advanced technology, reliability, and user-focused design makes it a prominent choice for businesses seeking optimized climate control solutions while ensuring sustainability and energy efficiency.
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